Stability Analysis and Reliability Evaluation in Cataclastic Loose Rock Mass Blocks

Liguo Zhang,Guanghe Li,Jiaxing Dong,Dong Wang,Jianpeng Zhang,Wenbing Wu

doi:10.1155/2021/5314937

Liguo Zhang, Guanghe Li + Show 4 more

Open Access

https://doi.org/10.1155/2021/5314937

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Abstract

Cataclastic rock masses with multiple failure modes and mechanisms are critical geological problems in the construction of rock slopes. Cataclastic rock masses are widely distributed in slopes of a hydropower project located on Lancang River, which is located in Tibet, China. In this study, the potentially unstable block of the slope is divided into key block and secondary key block based on the key block theory, and the system reliability evaluation theory is introduced. The method for quantitatively analyzing the rock mass stability of cataclastic slopes with sliding failure is established. Then, the spatial distribution of cataclastic rock masses and discontinuities in several rock slopes of a hydropower project are determined using traditional geological surveying and 3D laser scanning. At last, combining the BATE 2.0 software and the stereographic projection of the vector, the proposed method is applied to the study area. The results show that the main failure mode of the studied slope is wedge failure, and the system reliability is 1.69. With the increase in the instability probability of the key block, the increase in the instability probability of the system block is obvious, which reflects the controlling effect of the key block on the stability of the system block. The calculated system instability probability is slightly larger than the key block instability probability.

Highlights

In recent years, rapid economic development has demanded the construction of hydropower projects, highways, railways, and mines
Geological conditions are the basis of slope stability, which include the stages of exploration, design, construction, and operation. e specific research contents include the characteristics of the slope rock mass, physical and mechanical properties, geological analysis, slope deformation and failure modes, and geomechanical mechanisms [6]
Cataclastic rock mass stability problem is one of the main engineering geological problems faced by high-slope construction in alpine areas. e unique geological structure of these areas determines the discontinuous characteristics, and stability analysis of such an area needs to systematically consider the rock mass structure

Summary

Introduction

Rapid economic development has demanded the construction of hydropower projects, highways, railways, and mines. E main areas of research on high rock slopes mainly include geological conditions, stability analysis methods, control standards, reinforcement design, implementation control, and their effects in different conditions [1,2,3,4,5]. Since 1970, many rock mass classification systems that consider many affecting factors, such as the slope geometry, presence of water or water pressures, weathering effects, and excavation methods, have been proposed or modified and applied in the quantitative stability prediction of rock engineering [8,9,10,11,12,13,14]. A stability probability calculation method is proposed based on the research of geological properties and the corresponding analysis. en, the proposed method is applied to practical engineering, and the results show that the research has important engineering value and theoretical significance

Concept of a Cataclastic Rock Mass

Application

Findings

Conclusions