Growth of slip surfaces in 3D conical slopes

AbstractInterferometric Synthetic Aperture Radar (InSAR) enables detailed investigation of surface landslide movements, but it cannot provide information about subsurface structures. In this work, InSAR measurements were integrated with seismic noise in situ measurements to analyse both the surface and subsurface characteristics of a complex slow-moving landslide exhibiting multiple failure surfaces. The landslide body involves a town of around 6000 inhabitants, Villa de la Independencia (Bolivia), where extensive damages to buildings have been observed. To investigate the spatial-temporal characteristics of the landslide motion, Sentinel-1 displacement time series from October 2014 to December 2019 were produced. A new geometric inversion method is proposed to determine the best-fit sliding direction and inclination of the landslide. Our results indicate that the landslide is featured by a compound movement where three different blocks slide. This is further evidenced by seismic noise measurements which identified that the different dynamic characteristics of the three sub-blocks were possibly due to the different properties of shallow and deep slip surfaces. Determination of the slip surface depths allows for estimating the overall landslide volume (9.18 · 107 m3). Furthermore, Sentinel-1 time series show that the landslide movements manifest substantial accelerations in early 2018 and 2019, coinciding with increased precipitations in the late rainy season which are identified as the most likely triggers of the observed accelerations. This study showcases the potential of integrating InSAR and seismic noise techniques to understand the landslide mechanism from ground to subsurface.

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A search method for probabilistic critical slip surfaces with arbitrary shapes and its application in slope reliability analysis

Natural Hazards ◽

10.1007/s11069-021-04651-7 ◽

2021 ◽

Author(s):

Yibiao Liu ◽

Weizhong Ren ◽

Chenchen Liu ◽

Guijun Fu ◽

Wenhui Xu ◽

...

Keyword(s):

Reliability Analysis ◽

Search Method ◽

Slip Surfaces ◽

Arbitrary Shapes

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Convergence aspect of limit equilibrium methods for slopes

Canadian Geotechnical Journal ◽

10.1139/t90-013 ◽

1990 ◽

Vol 27 (1) ◽

pp. 145-151 ◽

Cited By ~ 13

Author(s):

R. N. Chowdhury ◽

S. Zhang

Keyword(s):

Factor Of Safety ◽

Slip Surface ◽

Limit Equilibrium ◽

Solution Process ◽

Iterative Solution ◽

Friction Angle ◽

Equilibrium Analysis ◽

Negative Slope ◽

Slip Surfaces ◽

Geological Discontinuity

This note is concerned with the multiplicity of solutions for the factor of safety that may be obtained on the basis of the method of slices. Discontinuities in the function for the factor of safety are discussed and the reasons for false convergence in any iterative solution process are explored, with particular reference to the well-known Bishop simplified method (circular slip surfaces) and Janbu simplified or generalized method (slip surfaces of arbitrary shape). The note emphasizes that both the solution method and the method of searching for the critical slip surface must be considered in assessing the potential for numerical difficulties and false convergence. Direct search methods for optimization (e.g., the simplex reflection method) appear to be superior to the grid search or repeated trial methods in this respect. To avoid false convergence, the initially assumed value of factor of safety F0 should be greater than β1(=−tan α1 tan [Formula: see text]) where α1 and [Formula: see text] are respectively the base inclination and internal friction angle of the first slice near the toe of a slope, the slice with the largest negative reverse inclination. A value of F0 = 1 + β1, is recommended on the basis of experience. If there is no slice with a negative slope for any of the slip surfaces generated in the automatic, search process, then any positive value of F0 will lead to true convergence for F. It is necessary to emphasize that no slip surface needs to be rejected for computational reasons except for Sarma's methods and similarly no artificial changes need to be made to the value of [Formula: see text] except for Sarma's methods. Key words: slope stability, convergence, limit equilibrium, analysis, optimization, slip surfaces, geological discontinuity, simplex reflection technique.

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Transient rotation of a spherical particle in a concentric cavity with slip surfaces

Fluid Dynamics Research ◽

10.1088/1873-7005/ac1cd3 ◽

2021 ◽

Author(s):

Meng X. Li ◽

Huan-Jang Keh

Keyword(s):

Spherical Particle ◽

Slip Surfaces

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Reconstruction of the Reservoir Fine Structure by Using Scattering Attributes

10.2118/206083-ms ◽

2021 ◽

Author(s):

Vladimir Cheverda ◽

Vadim Lisitsa ◽

Maksim Protasov ◽

Galina Reshetova ◽

Andrey Ledyaev ◽

...

Keyword(s):

Seismic Data ◽

Numerical Experiments ◽

Seismic Waves ◽

Fractured Reservoirs ◽

Three Dimensional ◽

Geological Structure ◽

Discrete Elements ◽

Digital Twin ◽

The North ◽

Slip Surfaces

Abstract To develop the optimal strategy for developing a hydrocarbon field, one should know in fine detail its geological structure. More and more attention has been paid to cavernous-fractured reservoirs within the carbonate environment in the last decades. This article presents a technology for three-dimensional computing images of such reservoirs using scattered seismic waves. To verify it, we built a particular synthetic model, a digital twin of one of the licensed objects in the north of Eastern Siberia. One distinctive feature of this digital twin is the representation of faults not as some ideal slip surfaces but as three-dimensional geological bodies filled with tectonic breccias. To simulate such breccias and the geometry of these bodies, we performed a series of numerical experiments based on the discrete elements technique. The purpose of these experiments is the simulation of the geomechanical processes of fault formation. For the digital twin constructed, we performed full-scale 3D seismic modeling, which made it possible to conduct fully controlled numerical experiments on the construction of wave images and, on this basis, to propose an optimal seismic data processing graph.

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Comparison of the Influences of Surface Texture and Boundary Slip on Tribological Performances

Mathematical Problems in Engineering ◽

10.1155/2015/126824 ◽

2015 ◽

Vol 2015 ◽

pp. 1-10 ◽

Cited By ~ 5

Author(s):

Qiyin Lin ◽

Baotong Li

Keyword(s):

Surface Texture ◽

Slip Velocity ◽

Structure Parameters ◽

Textured Surfaces ◽

Slider Bearing ◽

Boundary Slip ◽

Surface Textures ◽

Slip Surfaces ◽

Texture Structure ◽

The Relationship

Close attentions have been widely paid to the engineering textured and slip surfaces for improving bearing tribological performances. Comparison studies on the tribological characteristics of slip and textured surfaces are carried out in this work. The analysis results point out that the influences of surface texture and boundary slip on tribological performances of slider bearing are strongly similar. For the determinate surface textures, there is one and only value of slip velocity to make the tribological performances of textured and slip surfaces in agreement. The corresponding relation between the slip velocity and the texture structure parameters is also obtained, and the size of slip velocity is directly related to the texture geometry parameters including its position parameters. This study will help us to further understand the relationship between boundary slip and surface texture and also the slip phenomenon.

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