Analysis of the influence of rainfall infiltration on the stability of fractured rock slopes

At present, the research on the influence of rainfall infiltration on slope stability is mainly focused on soil slopes, while the research on fractured rock slope is relatively less. Under the condition of continuous rainfall, the coupling of seepage field and stress field generated by fractured rock slope is very likely to lead to slope instability damage. Based on the research of the slope engineering of a section of Haidong New Town, Dali City, Yunnan Province.Development, this paper simulates the coupling of stress field and seepage field of this slope under the rainfall condition on the basis of the finite element software Midas GTS, and applies the strength reduction method, which takes the non-convergence of finite element iterative calculation as the instability criterion of the slope, calculating the stability coefficient after coupling by numerical method, combining with the change analysis of pore water pressure and saturation, and comprehensively evaluating the change of slope stability. The simulation results show that under the rainfall conditions, the pore water pressure and saturation within the rocky slopes with and without fissures will change, and the stability coefficient of the slope will also change accordingly. The stability coefficient and matrix suction of slope will be significantly and rapidly reduced under rainfall conditions when the rainfall penetrates into the deep part of the slope through the fissures in rocky slopes with fissures. The results of this study provide a reference and basis for the engineering management of fissured rocky slopes under rainfall conditions.