| Landslide events have always been one of the major geological disasters causing people’s life safety and economic losses.However,in recent years,with the rapid establishment of infrastructure,the problem of slope instability has become an increasing research hotspot.There are many reasons affecting the stability of slopes,among which rainfall is the most important cause of slope instability.In order to explore the stability of the combined structure of anti-slip pile plus reinforced soil retaining wall under the influence of rainfall,three aspects are analyzed through the shear test of reinforced soil interface,active soil pressure analysis and numerical simulation of rainfall model:(1)In order to explore the shear characteristics of the interface between cohesive soil and geotextile under different influencing factors,HM-5760 pneumatic straight shear instrument is used to study the shear strength of reinforced soil interface.The effects of shear frequency,moisture content,vertical load and other factors on the properties of the tendon-soil interface are also considered for analysis.In order to study the effect of water content on the bearing capacity of foundation,this test is simulated as the change of shear strength at the interface of cohesive soil and geotextile after water immersion(rainfall);(2)Based on the existing research results,this paper makes a theoretical analysis of earth pressure of parallel retaining wall of cohesive fill considering the reinforcement effect.The shear stress between the cohesive fill and horizontal strata is examined to overcome some assumed defects,and the effects of reinforcement effect and slip crack face on lateral earth pressure coefficient and earth pressure combined force are analyzed according to the soil arch effect;(3)On the basis of the test and theory,the finite element software ABAQUS is used to study the mechanism of action of the composite structure and the stability energy of the typical structure under the rainfall condition,considering the rainfall factors and the influence of pile spacing on slope stability.The results of the analysis based on the above study are as follows.(1)The shear strength of clayey soil is influenced by its water content through the shear test at the tendon-soil interface,so the nature of the fill and the water content should be controlled in the actual project,and the water content of the soil should be near the optimum water content before construction.(2)Through theoretical analysis,the back pressure of the wall can be reduced by light backfill material and reasonable use of geotechnical material reinforcement to ensure the safe and stable operation of the structure.(3)The study on the stability of the combined support slope by using the finite element software ABAQUS found that there were significant changes in soil pressure before and after the rainfall,and the changes in rainfall intensity after the rainfall had little effect on the soil pressure,which almost overlapped in the upper part of the baffle and changed only at the bottom of the baffle and the changes were not significant.It indicates that the anti-slip pile-reinforced earth retaining wall has significant effect on the slope support under rainfall. |
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