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Psuedo static stability analysis of rock slope using patton’s shear criterion
International Journal of Geo-Engineering Pub Date : 2021-03-06 , DOI: 10.1186/s40703-020-00137-w
Subhadeep Metya , Neeraj Chaudhary , Keshav Kumar Sharma

A deterministic model for the factor of safety of an idealized rock mass for planar mode of failure is developed adopting Limit Equilibrium Method (LEM) using Patton’s shear strength criterion and considering practically occurring conditions such as the effect of tension crack, water filled up in tension crack, horizontal and vertical seismic acceleration, rock bolt stabilizing force and surcharge. In the Pseudo-static analysis horizontal seismic acceleration is taken outward from the slope and vertical seismic acceleration is considered in both the direction i.e. towards the direction of gravity (downward) and opposite to the direction of gravity (upward). An expression of normal stresses as limiting criterion has been derived in order to compare the field normal stresses along the failure surface. A detailed parametric study has been presented to investigate the influence of vertical seismic coefficient for both the direction on the stability of rock slope using developed expression. For high normal stress along the failure plane, it is observed that the factor of safety decreases with increase in the value of vertical seismic coefficient towards the direction of gravity and increases linearly with increase in the value of vertical seismic coefficient against the direction of gravity and the opposite trend has been found for lower normal stress. The vertical seismic coefficient against the direction of gravity has predominant effect on factor of safety of rock slope as the rate of increase/decrease of factor of safety with vertical seismic coefficient is more against the direction of gravity. Hence in determining the critical factor of safety, effect of vertical seismic coefficient against the direction of gravity should be considered.



中文翻译:

基于Patton剪切准则的岩石边坡伪静态稳定性分析。

采用极限平衡法(LEM),利用Patton的抗剪强度准则,并考虑了实际发生的条件,例如张裂的影响,张拉中充满的水,建立了适用于平面破坏模式的理想岩体安全系数的确定性模型。裂纹,水平和垂直地震加速度,锚杆稳定力和附加力。在伪静力分析中,水平地震加速度是从斜坡向外获取的,而垂直地震加速度是在两个方向即朝向重力方向(向下)和与重力方向相反(向上)的方向上考虑的。为了比较沿破坏面的场法向应力,已经导出了法向应力的表达式作为极限准则。提出了详细的参数研究,以利用发达的表达式研究两个方向的垂直地震系数对岩质边坡稳定性的影响。对于沿破坏面的高法向应力,可以观察到安全系数随着垂直地震系数的值朝着重力方向的增加而减小,并且随着垂直地震系数的值对着重力方向的增大而线性增加。已经发现相反的趋势是较低的法向应力。相对于重力方向的垂直地震系数对岩质边坡的安全系数具有主要影响,因为垂直地震系数对安全系数的增加/减小的速率对重力方向的影响更大。

更新日期:2021-03-07
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