Propose a viable stabilization method for slope in weak rock mass environment using numerical modelling: A case study from the cut slopes

IF 1.1 Q3 MINING & MINERAL PROCESSING

Journal of Mining and Environment Pub Date : 2021-10-27 DOI:10.22044/JME.2021.11198.2099

S. Hussain, Z. Rehman, N. Khan, Ishaq Ahmad, S. Raza, Muhammad Tahir, Asad Ullah, D. Afzal, Ali Khan, M. Salman, S. Sherin

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Abstract

The design of a stable slope in a rock mass environment is a quite complicated job due to the anisotropic behaviour of the rock mass. In this research work, the cut slopes at the Swat motorway in the weakest schist rock is numerically analyzed by the shear strength reduction (SSR) approach using the Finite Element-based 2D RS2 software. The slope is divided into two cases according to the nature of the rock. Each case of the cut slope is analyzed by two stabilization methods: 1) changing the characteristics of the slope 2) support system installation based on the Mohr-Coulomb (MCC) and Generalized Hoek and Brown (GHB) failure criteria in order to propose the most appropriate method for slope stabilization. The results obtained reveal that the Critical Strength Reduction Factor (CSRF) before applying the stabilization methods is 1.34 (MCC) and 1.04 (GHB) for Case-I and 1.21 (MCC) and 0.53 (GHB) for Case-II. CSRF for Case-I after changing the characteristics of the slope is observed to be 2.43 (MCC) and 2.33 (GHB), while for Case-II is 1.82 (MCC) and 1.26 (GHB), respectively. CSRF for Case-I after the support installation criteria is 1.59 (MCC) and 1.07 (GHB), while for Case-II is 1.65 (MCC) and 0.5 (GHB), respectively. Based on the comparative analysis, it is revealed that changing the characteristics of the slope method shows prominent results in both cases; therefore, this method can be effectively used in order to stabilize the slope in the weakest rock mass environment.

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提出了一种可行的软弱岩体环境下边坡稳定的数值模拟方法:以开挖边坡为例

由于岩体的各向异性，在岩体环境中设计稳定边坡是一项相当复杂的工作。在本研究工作中，使用基于有限元的2D RS2软件，采用抗剪强度折减（SSR）方法对Swat高速公路最弱片岩中的路堑边坡进行了数值分析。根据岩石的性质，斜坡分为两种情况。通过两种稳定方法对路堑边坡的每种情况进行分析：1）改变边坡的特性2）基于莫尔-库仑（MCC）和广义霍克-布朗（GHB）破坏标准的支护系统安装，以提出最合适的边坡稳定方法。所获得的结果表明，在应用稳定方法之前，情况I的临界强度折减系数（CSRF）分别为1.34（MCC）和1.04（GHB），情况II为1.21（MCC），0.53（GHB。改变斜率特性后，情况I的CSRF分别为2.43（MCC）和2.33（GHB），而情况II的CSRF则分别为1.82（MCC）或1.26（GHB。支架安装标准后，情况I的CSRF分别为1.59（MCC）和1.07（GHB），而情况II的CSRF则分别为1.65（MCC）或0.5（GHB。通过对比分析表明，改变斜率法的特征在两种情况下都表现出突出的效果；因此，该方法可以有效地用于最弱岩体环境下的边坡稳定。

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来源期刊

Journal of Mining and Environment MINING & MINERAL PROCESSING-

CiteScore

1.90

自引率

25.00%

发文量