A New Method to Analyze Seismic Stability of Cut Soil Slope

2011 ◽  
Vol 90-93 ◽  
pp. 48-51
Author(s):  
Jun Jie Wang ◽  
Hui Ping Zhang ◽  
Tao Liu
Keyword(s):  
Slip Surface ◽  
New Method ◽  
Seismic Stability ◽  
Soil Slope ◽  
Balance Equations ◽  
Inclined Plane ◽  
Basic Assumptions ◽  
Straight Lines ◽  
Acceptability Criterion ◽  
Force Equilibrium

A new method to analyze the seismic stability of the cut soil slope is suggested in this study. In the method, the limiting equilibrium theory and the stress analyzing method are used. The stress acceptability criterion is based on the limited strength of soil. Two basic assumptions are given in the method. One is that the slip surface can be replaced by a series of straight lines. The other is that the interslice boundary is an inclined plane. Three balance equations for any slice, which are two for force equilibrium and one for moment equilibrium, are proposed. An iterative method, which solves the balance equations from the first slice to the last slice, is also suggested. In the new method, the slip surface is not predefined, but is obtained slice by slice going from downhill to uphill in terms of the force and moment balance equations of the slice.

Determine to Slip Surface in Waterfront Soil Slope Analysis

2011 ◽  
Vol 378-379 ◽  
pp. 466-469 ◽  
Author(s):  
Jun Jie Wang ◽  
Hui Ping Zhang ◽  
Tao Liu
Keyword(s):  
Iterative Method ◽  
Slip Surface ◽  
The Other ◽  
New Method ◽  
Soil Slope ◽  
Balance Equations ◽  
Inclined Plane ◽  
Slope Analysis ◽  
Basic Assumptions ◽  
Straight Lines

This study focuses on the method to determine the slip surface in waterfront soil slope analysis under static and seismic conditions. Based on the limiting equilibrium theory and the stress analyzing method, a new method to determine the slip surface is suggested. In the method, the two basic assumptions are considered in order to solve the problem. One is that the slip surface comprises a series of straight lines, and the other is that the interslice boundary is an inclined plane. Three balance equations for any slice are proposed. The iterative method to solve the balance equations is also suggested. In the new method, the slip surface is obtained slice by slice going from downhill to uphill in terms of the balance equations of the slice, not predefined.

scholarly journals Method for Determining Critical Slip Surface of Cohesive Soil Slope Based on the Principle of Simple Penetration Test

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Aiqing Zhang ◽  
Jinyun Li ◽  
Youheng Zhang
Keyword(s):  
Bearing Capacity ◽  
Abrupt Change ◽  
Slip Surface ◽  
Accurate Determination ◽  
Cohesive Soil ◽  
New Method ◽  
Soil Slope ◽  
Critical Slip Surface ◽  
Penetration Test ◽  
Foundation Soil

In order to propose a new method for determining the critical slip surface of the cohesive soil slope, the relational expression between the number of simple penetration and slope bearing capacity is established on the basis of studying the principle of the simple penetration test with reference to the research result concerning the number of standard penetration and bearing capacity of foundation soil. The measuring points are arranged at the slope of a certain road slope according to the actual conditions, to measure the number of simple penetration, calculate the slope bearing capacity at different depths with the relational expression, draw the curve of slope bearing capacity changing with the depth, search the points of abrupt change in slope bearing capacity to get the arc curve of abrupt change points, and then determine the critical slip surface of slope. The test results are compared with the results calculated by the finite element method (FEM) and theoretical method, to verify the feasibility and rationality of the simple penetration method. The research results show that the simple penetration method is applicable to and capable of quick and accurate determination of critical slip surface of the cohesive soil slope, thus providing a new method for analyzing the slope stability of cohesive soil.

scholarly journals EFFICIENT LINE DETECTION METHOD BASED ON 2D CONVOLUTION FILTER

2021 ◽  
Vol 11 (4) ◽  
pp. 22-27
Author(s):  
Paweł Kowalski ◽  
Piotr Tojza
Keyword(s):  
Detection Method ◽  
Computational Cost ◽  
New Method ◽  
Line Detection ◽  
Curve Detection ◽  
Real Time Image ◽  
Convolution Filter ◽  
Straight Lines ◽  
Time Image ◽  
Local Detection

The article proposes an efficient line detection method using a 2D convolution filter. The proposed method was compared with the Hough transform, the most popular method of straight lines detection. The developed method is suitable for local detection of straight lines with a slope from -45˚ to 45˚.  Also, it can be used for curve detection which shape is approximated with the short straight sections. The new method is characterized by a constant computational cost regardless of the number of set pixels. The convolution is performed using the logical conjunction and sum operations. Moreover, design of the developed filter and the method of filtration allows for parallelization. Due to constant computation cost, the new method is suitable for implementation in the hardware structure of real-time image processing systems.

scholarly journals A New Method for Inverse Calculation of c and φ on a Slip Surface (Part II)

Landslides ◽  
1984 ◽  
Vol 21 (3) ◽  
pp. 24-31_1 ◽  
Author(s):  
Takuo YAMAGAMI ◽  
Yasuhiro UETA
Keyword(s):  
Slip Surface ◽  
New Method ◽  
Surface Part

Physical experiment investigation on progressive deformation of shear slip surface of the soil slope

2021 ◽  
Author(s):  
Qiang Xie ◽  
Yuxin Ban ◽  
Zhihui Wu ◽  
Xiang Fu
Keyword(s):  
High Frequency ◽  
Surface Deformation ◽  
Slip Surface ◽  
Progressive Failure ◽  
Surface Displacement ◽  
Soil Slope ◽  
Progressive Deformation ◽  
Shear Surface ◽  
Time Frequency ◽  
Ae Signal

<p>The sliding surface deformation of the soil slope mainly presents progressive failure characteristics, and serial acoustic emission (AE) signals are generated during the deformation process of progressive landslide. A model test aiming at reproducing the typical shear surface deformation of a soil slope is designed. The displacement, AE data and corresponding time-frequency characteristics are comprehensively analyzed to evaluate the progressive deformation behavior. Comparisons with different granular backfills measurements show that cumulative AE count increase proportionally with the shear surface displacement, and the experiments demonstrate that the glass sand backfill exhibits remarkable AE detection characteristics and stronger correlation results. Significantly, AE signal exhibits variational dominant frequencies at different deformation stages, and there is the significant phenomenon that not only the low frequency signals generated with a significantly increase number, at the same time the continuous high frequency signals appear during the accelerating deformation stage. Furthermore, from the statistical trend of the energy percentage of the high frequency band into 312.5~500 kHz, it’s found that the correlative energy proportion occupies up to 15%, or even higher during the accelerating stage, indicating that the landslide may be about to enter a severely dangerous stage. The experiments show that the frequency characteristic of the AE signal can be effectively used as the early warning index, which may be the promising reference of the field warning monitoring for the soil progressive landslides.</p>

Stresses and deformations in a reinforced soil slope

1990 ◽  
Vol 27 (2) ◽  
pp. 224-232 ◽  
Author(s):  
R. J. Chalaturnyk ◽  
J. D. Scott ◽  
D. H. K. Chan ◽  
E. A. Richards
Keyword(s):  
Finite Element ◽  
Slip Surface ◽  
Limit Equilibrium ◽  
Maximum Load ◽  
Reinforced Soil ◽  
Soil Reinforcement ◽  
Soil Slope ◽  
Element Analysis ◽  
Reinforced Slope ◽  
Reinforcing Layer

Nonlinear finite element analyses were performed on a nonreinforced embankment and a polymeric reinforced embankment, with 1:1 side slopes, constructed on competent foundations. The nonreinforced and reinforced embankment analyses are compared to examine the influence of polymeric reinforcement within a soil slope. It is shown that significant reductions in the shearing, horizontal, and vertical strains within the slope occur because of the presence of the reinforcement.The finite element analysis of the reinforced embankment construction gives the magnitude and distribution of load within the reinforcement. For all embankment heights, the maximum reinforcement load did not occur in the lowest reinforcing layer but in the reinforcing layer placed 0.4H above the foundation, where H is the height of the slope. The displacement patterns and surface deformations of the nonreinforced and reinforced slopes are compared to show the marked reduction in slope movements resulting from the presence of the reinforcement.The location and shape of potential shear surfaces within the homogeneous reinforced slope are examined. The position of the maximum load in each reinforcing layer within the reinforced slope indicates that, for the example studied, a circular-shaped slip surface represents a probable failure mechanism within the slope. Key words: soil reinforcement, geotextiles, finite element, slope stability, geogrids, limit equilibrium, reinforced slope.

The mass strength of jointed residual soils

1982 ◽  
Vol 19 (3) ◽  
pp. 225-231 ◽  
Author(s):  
Y. C. Koo
Keyword(s):  
Joint Strength ◽  
Slip Surface ◽  
Probabilistic Method ◽  
Structural Defects ◽  
Metamorphic Rocks ◽  
Soil Slope ◽  
Practical Application ◽  
Residual Soils ◽  
Upper Limit

Structural defects in the form of relict joints are frequently found in residual soils derived from the decomposition of igneous and metamorphic rocks. Previous studies indicate that the shear strength along relict joints is generally less than that of the intact material and therefore such joints form planes of weakness in the jointed soil. Slope designs in jointed soils, based on the strength of the intact material without considering the presence of adversely oriented relict joints, may be unsafe. The distribution of mass strength of jointed soils in the field is bimodal, with the intact strength as an upper limit and the joint strength as a lower limit; it varies with direction and with the geometry of the potential slip surface. In order to describe this behaviour, a probabilistic method to estimate the mass strength is presented and its practical application is illustrated by a case study.

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