Rainfall Induced Soil Slope Failure

Author : Lulu Zhang
Publisher : CRC Press
ISBN 13 : 1498752861
Total Pages : 374 pages
Book Rating : 4.62/5 ( download)

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Download or read book Rainfall-Induced Soil Slope Failure written by Lulu Zhang and published by CRC Press. This book was released on 2018-09-03 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rainfall-induced landslides are common around the world. With global climate change, their frequency is increasing and the consequences are becoming greater. Previous studies assess them mostly from the perspective of a single discipline—correlating landslides with rainstorms, geomorphology and hydrology in order to establish a threshold prediction value for rainfall-induced landslides; analyzing the slope’s stability using a geomechanical approach; or assessing the risk from field records. Rainfall Induced Soil Slope Failure: Stability Analysis and Probabilistic Assessment integrates probabilistic approaches with the geotechnical modeling of slope failures under rainfall conditions with unsaturated soil. It covers theoretical models of rainfall infiltration and stability analysis, reliability analysis based on coupled hydro-mechanical modelling, stability of slopes with cracks, gravels and spatial heterogenous soils, and probabilistic model calibration based on measurement. It focuses on the uncertainties involved with rainfall-induced landslides and presents state-of-the art techniques and methods which characterize the uncertainties and quantify the probabilities and risk of rainfall-induced landslide hazards. Additionally, the authors cover: The failure mechanisms of rainfall-induced slope failure Commonly used infiltration and stability methods The infiltration and stability of natural soil slopes with cracks and colluvium materials Stability evaluation methods based on probabilistic approaches The effect of spatial variability on unsaturated soil slopes and more

Author :
Publisher :
ISBN 13 : 9789810429287
Total Pages : 86 pages
Book Rating : 4.82/5 ( download)

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Download or read book Rainfall-induced Slope Failures written by and published by . This book was released on 2000 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author : Md Aminul Islam (Ph.D.)
Publisher :
ISBN 13 :
Total Pages : 306 pages
Book Rating : 4.94/5 ( download)

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Download or read book Rainfall-induced Slope Failure written by Md Aminul Islam (Ph.D.) and published by . This book was released on 2022 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: Globally, slope failures cause substantial death tolls and economic loss. Embankments constructed on high plasticity clay are vulnerable to cyclic swelling and shrinkage when subjected to climate. Thus, over time, soil softens and reduces effective shear strength, and shrinkage cracks on slopes can act as pathways for rainfall infiltration, which increases pore water pressure and lowers the shear strength below critical levels, resulting in slope failure. This study aims to develop early warning criteria for rainfall-induced slope failure. Study areas were Tarrant, Dallas, Johnson, and Ellis, where soil types and a humid subtropical climate result in frequent slope failures. The field study was conducted on a 260 ft section of a highway slope (3H:1V) located over US 287 near Midlothian, TX. The test slope sections were instrumented using moisture sensors, temperature sensors, water potential sensors, and a rain gauge. According to the geotechnical investigation, there are two distinct soil strata: top 22 feet high plasticity clay (CH), followed by Eagle Ford Shale. Hydraulic conductivity and shear strength of soils fluctuated seasonally. Field tests using the Guelph Permeameter and Mini-Disk Infiltrometer showed 100 times higher permeability at the surface than at two feet below ground due to loosen and porous soil at the surface. As measured by Dynamic Cone Penetration (DPC) tests, soil shear strength was higher in the dry season and lower in the wet season. According to field instrumentation, soil moisture content and soil matric suction change with depth throughout the year: surface soil experiences more changes than deeper soils. Water content fluctuates most at the top sensors (10%) than at the deeper levels (3%). During the dry season, soil matric suction increased, but decreased after each rainfall. A slope failure inventory map for the DFW area was developed based on previous literature, thesis, and Google Earth analyses. Seventy percent of failure events were observed on highways built in high plasticity clay soils in Tarrant and Dallas counties, where the Eagle Ford Shale predominates. A susceptibility map was developed for the study area based on the slope failure inventory, geology, and topography data. Based on the frequency ratio (FR) method, slope, soil, elevation, aspect, curvature, profile curvature, plan curvature, normalized vegetation index, and soil moisture index were weighted. According to the map, there are five levels of susceptibility: very low, low, moderate, high, and very high. The slope failure susceptibility model demonstrated a success rate of 71.54% and a prediction rate of 70.12%. Slope failures tend to increase with increased rainfall. Empirical thresholds such as Intensity-duration (ID), Event rainfall-duration (ED), Event rainfall-intensity (EI), daily rainfall-antecedent rainfall (3, 5, 10, and 30 days) were established. The numerical study (seepage and slope stability) demonstrated that rainfall duration has a significant impact on rainfall-induced slope failure. A high-intensity rainfall can lead to a drastic drop in pore-water pressure in a short period of time, resulting in slope failure much faster than a low-intensity rain. The slope becomes more vulnerable to failure if it cracks and faces a higher rainfall intensity. Based on a numerical simulation of a field slope section, site-specific thresholds of rainfall intensity and duration were developed and can be used to prevent slope failure caused by rainfall. The numerical model successfully replicated the failed field section at the edge of the study area which failed in 2020. Empirical thresholds predicted the failure as well. Therefore, the established thresholds may be a useful tool for regional slope failure warning systems to predict rainfall-induced slope failure.

Author : Lizhou Wu
Publisher : Springer Nature
ISBN 13 : 9811507619
Total Pages : 245 pages
Book Rating : 4.18/5 ( download)

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Download or read book Hydro-mechanical Analysis of Rainfall-Induced Landslides written by Lizhou Wu and published by Springer Nature. This book was released on 2020-01-14 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt: Most landslides are triggered by rainfall. In previous studies, slope stability is often evaluated based on the infiltration analysis. Hydro-mechanical coupling is significant to rainfall-caused landslide evolution. This book covers theoretical models of unsaturated infiltration, and provides hydro-mechanical models for rainfall-induced landslides. The influences of rainfall patterns, boundary conditions, layered structures, and SWCC hysteresis on the coupled unsaturated infiltration and deformation are discussed. Laboratory testing of rainfall-induced landslides is performed to study the developing process of landslide upon rainfall infiltration. The results provide a better understanding of rainfall-induced landslides.

Author : Delwyn G. Fredlund
Publisher : John Wiley & Sons
ISBN 13 : 1118133595
Total Pages : 946 pages
Book Rating : 4.90/5 ( download)

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Download or read book Unsaturated Soil Mechanics in Engineering Practice written by Delwyn G. Fredlund and published by John Wiley & Sons. This book was released on 2012-07-24 with total page 946 pages. Available in PDF, EPUB and Kindle. Book excerpt: The definitive guide to unsaturated soil— from the world's experts on the subject This book builds upon and substantially updates Fredlund and Rahardjo's publication, Soil Mechanics for Unsaturated Soils, the current standard in the field of unsaturated soils. It provides readers with more thorough coverage of the state of the art of unsaturated soil behavior and better reflects the manner in which practical unsaturated soil engineering problems are solved. Retaining the fundamental physics of unsaturated soil behavior presented in the earlier book, this new publication places greater emphasis on the importance of the "soil-water characteristic curve" in solving practical engineering problems, as well as the quantification of thermal and moisture boundary conditions based on the use of weather data. Topics covered include: Theory to Practice of Unsaturated Soil Mechanics Nature and Phase Properties of Unsaturated Soil State Variables for Unsaturated Soils Measurement and Estimation of State Variables Soil-Water Characteristic Curves for Unsaturated Soils Ground Surface Moisture Flux Boundary Conditions Theory of Water Flow through Unsaturated Soils Solving Saturated/Unsaturated Water Flow Problems Air Flow through Unsaturated Soils Heat Flow Analysis for Unsaturated Soils Shear Strength of Unsaturated Soils Shear Strength Applications in Plastic and Limit Equilibrium Stress-Deformation Analysis for Unsaturated Soils Solving Stress-Deformation Problems with Unsaturated Soils Compressibility and Pore Pressure Parameters Consolidation and Swelling Processes in Unsaturated Soils Unsaturated Soil Mechanics in Engineering Practice is essential reading for geotechnical engineers, civil engineers, and undergraduate- and graduate-level civil engineering students with a focus on soil mechanics.

Author : Lizhou Wu
Publisher : Springer Nature
ISBN 13 : 9811997373
Total Pages : 141 pages
Book Rating : 4.72/5 ( download)

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Download or read book Rainfall Infiltration in Unsaturated Soil Slope Failure written by Lizhou Wu and published by Springer Nature. This book was released on 2023-05-31 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is an open access book. The aim of this book is to provide a thorough grounding in rainfall-induced landslides from three aspects: the coupling effect of hydraulic and mechanic; the analytical, numerical, and physical simulation methods, and the controlling factors underlying the problem of rainfall-induced landslides. The improved numerical methods, nonlinear, and linear iterative methods which can be used to address the related unsaturated infiltration problems are also presented. This book is an essential reading for researchers and graduate students who are interested in rainfall infiltration, landslides, slope stability, and geohazards in fields of civil engineering, engineering geology, and earth science. The book is written to guide professional engineers and practitioners in slope engineering and geohazard management. This book can enhance their understanding of rainfall-induced landslides, help them analyze a specific problem, prevent landslides, and design engineering slopes according to the local soil and climate conditions.

Author : H. Raharjdo
Publisher : CRC Press
ISBN 13 : 1000100367
Total Pages : 873 pages
Book Rating : 4.65/5 ( download)

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Download or read book Unsaturated Soils for Asia written by H. Raharjdo and published by CRC Press. This book was released on 2020-09-10 with total page 873 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a collection of articles from the Asian conference UNSAT-ASIA 2000, covering topics such as: historical developments; numerical modelling; suction measurement techniques; permeability and flow; mass transport; and engineering applications.

Author : Jubair Hossain
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.16/5 ( download)

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Download or read book Geohazard Potential of Rainfall Induced Slope Failure on Expansive Clay written by Jubair Hossain and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Each year, rain induced slope failures cause significant damages in highway infrastructures and environments, as well as tragic losses of human lives around the world. Rainfall-induced slope failure is a common problem in areas with slope constructed on high plasticity clays. These post failure costs can be significantly reduced if precautions are taken ahead of time. Development of an early hazard warning system based on weather forecast data can help identify potential slopes susceptible to failure due to rainfall. But development of such system will require a better understanding of the in situ behavior of soil due to rainwater infiltration as well as changes in shear strength characteristics of the soil. Slope stability studies in different parts of the world have indicated that infiltration of rain water into the soil has an adverse effect on the stability of earth slopes. During the infiltration process, the matric suction in the unsaturated soil slope decreases as the saturation increases with time, thereby reducing the shear strength of the soil. Therefore, it is important to identify the depth of moisture variation zone (i.e., active zone), along with field infiltration behavior, to accurately predict the response and stability of earth slopes constructed on expansive clay when exposed to a rainfall event. The objectives of this research are to determine, 1) the active zone of expansive clayey soil, 2) changes in moisture content and matric suction of soil slopes constructed on expansive clay due to infiltration of rainwater, 3) effects of rainwater infiltration on soil shear strength, 4) modeling and determining geohazard potential of soil slopes due to rainwater infiltration and finally 5) recommendation for future study. A field instrumentation program was undertaken to determine the active zone and study the infiltration behavior of embankment slope constructed on high plasticity expansive clay. An experimental program was developed to study the soil water retention characteristics and associated shear strength for different suction values. The results from laboratory testing and field instrumentation was combined with numerical modeling to study the effect of rainfall infiltration and associated geohazard potential of slope constructed on expansive clay. Results obtained from the field instrumentation, indicates that the variation in the moisture content and matric suction were different at different depth. The maximum variation often occurred near the ground surface (i.e. at 1.2 m depth) and the magnitude of variation decreased with increase in depth. Presence of cracks at the crest also accelerated the ingress of water into the slope during rainfall events. The depth of active zone up to which moisture variation occurs was observed to be 3.6 m. Therefore, reduction in soil shear strength due to cyclic variation of weather condition is limited to a depth of 3.6 m which also matches close to the observed failure depth (3.04 m) on slopes constructed on high PI clay. Laboratory results on soil water characteristic curve (SWCC) showed that, SWCC of expansive clay yields higher air entry value and lower desaturation rate when compared with no volume change assumption during SWCC determination. Specimens compacted wet of optimum do not strongly depend on the applied stress history due to identical micro-structure formation. On the other hand, SWCC of expansive clay, compacted dry of optimum water content shows a shift to the right with high net normal stresses which indicates increase in air entry value. Results obtained from suction controlled ring shear tests indicate that both net normal stress and matric suction has significant influence on peak and residual strength of expansive clay. Both peak and residual strength increases with increase in net normal stress and matric suction. Results obtained from direct shear tests on saturated samples indicated that, shear strength of high PI expansive clay decreases when subjected to cycles of wetting and drying. The value of cohesion completely disappears due to wet dry cycles leading to shear strength condition at normally consolidated state. Based on the numerical modeling using PLAXIS, low intensity long duration rainfall was found to be most critical for expansive clay under current study which is consistent with the results previously reported for soils with low permeability. Effect of rainfall return period was found to be insignificant for the current study. Stability analyses performed for different rainfall event showed that, use of fully softened strength for active zone can reduce the factor of safety as low as twice the value as compared to the as compacted strength.

Author : Satyajit Patel
Publisher : Springer Nature
ISBN 13 : 9813363460
Total Pages : 766 pages
Book Rating : 4.65/5 ( download)

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Download or read book Proceedings of the Indian Geotechnical Conference 2019 written by Satyajit Patel and published by Springer Nature. This book was released on 2021-04-29 with total page 766 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprises select proceedings of the annual conference of the Indian Geotechnical Society. The conference brings together research and case histories on various aspects of geotechnical and geoenvironmental engineering. The book presents papers on geotechnical applications and case histories, covering topics such as (i) Characterization of Geomaterials and Physical Modelling; (ii) Foundations and Deep Excavations; (iii) Soil Stabilization and Ground Improvement; (iv) Geoenvironmental Engineering and Waste Material Utilization; (v) Soil Dynamics and Earthquake Geotechnical Engineering; (vi) Earth Retaining Structures, Dams and Embankments; (vii) Slope Stability and Landslides; (viii) Transportation Geotechnics; (ix) Geosynthetics Applications; (x) Computational, Analytical and Numerical Modelling; (xi) Rock Engineering, Tunnelling and Underground Constructions; (xii) Forensic Geotechnical Engineering and Case Studies; and (xiii) Others Topics: Behaviour of Unsaturated Soils, Offshore and Marine Geotechnics, Remote Sensing and GIS, Field Investigations, Instrumentation and Monitoring, Retrofitting of Geotechnical Structures, Reliability in Geotechnical Engineering, Geotechnical Education, Codes and Standards, and other relevant topics. The contents of this book are of interest to researchers and practicing engineers alike.

Author : Matjaz Mikos
Publisher : Springer
ISBN 13 : 331953498X
Total Pages : 1148 pages
Book Rating : 4.85/5 ( download)

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Download or read book Advancing Culture of Living with Landslides written by Matjaz Mikos and published by Springer. This book was released on 2017-06-10 with total page 1148 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains peer-reviewed papers from the Fourth World Landslide Forum organized by the International Consortium on Landslides (ICL), the Global Promotion Committee of the International Programme on Landslides (IPL), University of Ljubljana (UL) and Geological Survey of Slovenia in Ljubljana, Slovenia from May 29 to June 2,. The complete collection of papers from the Forum is published in five full-color volumes. This second volume contains the following: • Two keynote lectures • Landslide Field Recognition and Identification: Remote Sensing Techniques, Field Techniques • Landslide Investigation: Field Investigations, Laboratory Testing • Landslide Modeling: Landslide Mechanics, Simulation Models • Landslide Hazard Risk Assessment and Prediction: Landslide Inventories and Susceptibility, Hazard Mapping Methods, Damage Potential Prof. Matjaž Mikoš is the Forum Chair of the Fourth World Landslide Forum. He is the Vice President of International Consortium on Landslides and President of the Slovenian National Platform for Disaster Risk Reduction. Prof. Binod Tiwari is the Coordinator of the Volume 2 of the Fourth World Landslide Forum. He is a Board member of the International Consortium on Landslides and an Executive Editor of the International Journal “Landslides”. He is the Chair-Elect of the Engineering Division of the US Council of Undergraduate Research, Award Committee Chair of the American Society of Civil Engineering, Geo-Institute’s Committee on Embankments, Slopes, and Dams Committee. Prof. Yueping Yin is the President of the International Consortium on Landslides and the Chairman of the Committee of Geo-Hazards Prevention of China, and the Chief Geologist of Geo-Hazard Emergency Technology, Ministry of Land and Resources, P.R. China. Prof. Kyoji Sassa is the Founding President of the International Consortium on Landslides (ICL). He is Executive Director of ICL and the Editor-in-Chief of International Journal“Landslides” since its foundation in 2004. IPL (International Programme on Landslides) is a programme of the ICL. The programme is managed by the IPL Global Promotion Committee including ICL and ICL supporting organizations, UNESCO, WMO, FAO, UNISDR, UNU, ICSU, WFEO, IUGS and IUGG. The IPL contributes to the United Nations International Strategy for Disaster Reduction and the ISDR-ICL Sendai Partnerships 2015–2025.