Author: Joakim G. LagurosPublisher:
ISBN:
Category : Clay
Languages : en
Pages : 12
Book Description
Failure of Slopes in Overconsolidated Clay
Author: Joakim G. LagurosPublisher:
ISBN:
Category : Clay
Languages : en
Pages : 12
Book Description
Initiation of Failure in Slopes in Overconsolidated Clays and Clay Shales
Author: Ioannis V. ConstantopoulosPublisher:
ISBN:
Category : Finite element method
Languages : en
Pages : 164
Book Description
The Initiation of Failure in Slopes in Overconsolidated Clays and Clay Shales
Author: Ioannis V. ConstantopoulosPublisher:
ISBN:
Category : Finite element method
Languages : en
Pages : 148
Book Description
The conditions leading to the initiation of failure in slopes of overconsolidated clay or clay shale are investigated by means of two finite element programs. The analysis is two-dimensional and assumes plane strain in a homogeneous semi-infinite mass. The material is assumed to be linearly elastic and isotropic with body forces. No pore pressure effects are analyzed. The effects of initial stress ratio, slope angle, and available friction, are investigated for two smooth bottom models and the one rough bottom model. The results are presented in a dimensionless ratio involving the cohesion required to prevent the beginning of failure and the overburden stress at the toe before excavation.
Slope Failures in an Over-consolidated Clay, Seattle, Washington
Author: Donald Joseph PalladinoPublisher:
ISBN:
Category : Embankments
Languages : en
Pages : 408
Book Description
Shear Strength Characteristics and Failure Mechanism of Slopes in Overconsolidated Soils of Nebraska
Author: Hossein BahmyariPublisher:
ISBN:
Category : Soil stabilization
Languages : en
Pages : 136
Book Description
Geotechnical engineers deal with some challenging problems when encountering long-term slope stability in overconsolidated clays and clayey shales. One of these problems is determining a suitable method to estimate the reliable shear strength of overconsolidated clayey soils for long-term slope stability. According to Eversol (2013), one half of the counties in Nebraska have experienced slope failure in overconsolidated soils, especially in north and east Nebraska. In this research, shear strength characteristics of overconsolidated clayey soils of Nebraska is investigated in regard to long-term stability of slopes, and the failure mechanism in such soils is examined. Undisturbed samples from boring logs from two different failure locations were taken. The research involved laboratory testing to compare and investigate the shear strength parameters of overconsolidated soils in undrained and drained conditions at high and low normal effective stress levels. Some issues that are addressed include: (i) the shear strength reduction due to low effective stress in adrained condition, (ii) the swelling behavior during consolidation and shearing stages of saturated overconsolidated soils in low effective confining stress, (iii) the suitable shear strength that helps to design/repair slopes in overconsolidated soils of Nebraska. One major finding of this research is that one of the main reasons for slope instability in overconsolidated clayey soils and shales in Nebraska is shear strength reduction. This strength reduction, which usually causes a progressive failure in overconsolidated soils in Nebraska, is due to swelling and softening; (2) the presence of expansive clay minerals in overconsolidated soils induced additional swelling in some areas reduces the shear strength of soils dramatically, especially at shallow depths; and (3) the laboratory results showed that the fully softened shear strength from a consolidated drained triaxial test may present a suitable shear strength for long-term slope stability in overconsolidated soils in Nebraska.
Slopes in Stiff-fissured Clays and Shales
Author: James Moyer DuncanPublisher:
ISBN:
Category : Clay soils
Languages : en
Pages : 38
Book Description
Some Slope Failures in Heavily Over-consolidated Clay
Author: Drum Centrifuge Studies of Overconsolidated Clay Slopes
Author: Richard John FragaszyPublisher:
ISBN:
Category : Centrifugation, Density gradient
Languages : en
Pages : 290
Book Description
Slope Analysis
Author: R ChowduryPublisher: Elsevier
ISBN: 0444601392
Category : Technology & Engineering
Languages : en
Pages : 436
Book Description
Slope Analysis summarizes the fundamental principles of slope analysis. It explores not only the similarities but also the differences in rock slopes and soil slopes, and it presents alternative methods of analysis, new concepts, and new approaches to analysis. The book introduces both natural and man-made slopes, the nature of soils and rocks, geomorphology, geology, and the aims of slope analysis. These topics are followed by chapters about stress and strain, shear strength of rock and soils, and progressive failure of slopes. This book also presents limit equilibrium methods I and II, which are the planar failure surfaces and slip surfaces of arbitrary shape, respectively. It also includes stress analysis and slope stability, natural slope analysis, and a brief review on plasticity and shear band analysis. Before presenting its conclusions, the book discusses special aspects of slope analysis, such as earthquake analysis, pseudo-static analysis, dynamic analysis, and anisotropy, in addition to Newmark's approach.
Author: Laurits Bjerrum