Stability Analysis of Soft Rock Slope Considering Seepage Softening and Damage Effects

Haijian Lan; Liangsheng Chen

doi:10.6919/ICJE.202509_11(9).0006

Authors

Haijian Lan
Liangsheng Chen

DOI:

https://doi.org/10.6919/ICJE.202509_11(9).0006

Keywords:

Road Engineering; Soft Rock Slope; Seepage; Damage Effect; Softening Effect.

Abstract

The geological disasters of soft rock slope instability are more and more concerned by the engineering community. Rainfall infiltration is an important factor inducing its instability. In order to analyze the change process of the dynamic stability of soft rock slopes under different rainfall conditions, an analysis method considering soft rock damage-softening-seepage effect is proposed for soft rock seepage softening and damage effects. Variation of slope seepage characteristics, stability and plastic zone distribution. The results show that soft rock slopes are mainly affected by unsaturated seepage effects during the early rainfall period. The softening effects in the transient saturated zone gradually deepen the slope stability with the extension of the softening time. The value increases gradually. Long-term light rain is more likely to cause slope instability than short-time heavy rain, and the stability has a "response delay" phenomenon. The stability coefficient and plastic failure zone of soft rock slopes are affected by both unsaturated seepage and softening effects. They gradually change from the local instability controlled by the cover of the slope to the overall instability controlled by the softening effect of soft rocks. The calculation results considering the seepage softening and damage effects of soft rocks will be more in line with the actual situation, which can provide reference value for the seepage stability management of soft rock slopes.

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