Study On The Slope Stability Of Tunnel Outlet In Wanxing Road Under Rainfall Infiltration Condition

Wan Xinglu tunnel axis with the strike of the strata with large Angle intersection,export position lifted up steep slope degree,slope is mainly composed of the soil and mudstone,its low strength,poor stability of slope body.In order to prevent the potential failure of the slope in the tunnel construction,the anti-slide pile reinforcement is adopted.Around Wan Xinglu slope anti-slide pile reinforcement in tunnel engineering,this paper use of professional large-scale geotechnical software FLAC3 D,the strength subtraction,unsaturated seepage calculation procedures of secondary development,the conventional and the analysis of slope stability is simulated under rainfall conditions,with site anti-slide pile monitoring data verify the stability of slope,which proves the correctness of the theoretical analysis.The main jobs are as follows:(1)from the Wan Xinglu tunnel entrance slope engineering according to the characteristics of deformation and failure characteristics of the slope body,analyzes the forming mechanism of slope instability may occur and influence factors.(2)using the numerical simulation software FLAC3 D,the slope for the numerical analysis,obtained the critical slip surface of slope,and the displacement and stress of slope is analyzed.The stability factor of slope stability after the reinforcement is calculated.(3)the non-saturated seepage calculation was achieved through secondary development in FLAC3 D.Combined with strength subtraction and saturated-unsaturated seepage theory to study the different rainfall intensity downhill body pore water pressure distribution and change characteristics of different rainfall intensity is analyzed,the influence of the rainfall duration on the slope stability coefficient.(4)The reliability of the numerical analysis method is verified by analyzing the results of the field monitoring data and numerical analysis.