Field Test Study on Failure Mode and Warning Threshold of Granite Residual Soil Slope under Rainfall Condition
Rainfall is the main factor of slope instability.In order to study the evolution and migration law of slope humidity under rain infiltration under different rainfall intensities.The field tests of slope instability under different rainfall intensities of 75 mm/h,125 mm/h,150 mm/h and 175 mm/h were conducted,and the progressive failure characteristics of slope were studied according to the water-time-time and displacement-time curves,and the rainfall time and rainfall threshold of slope instability were proposed.According to the rainfall intensity,the slope instability failure can be divided into four modes:shallow local slide,shallow integral slide and collapse,deep local slide and deep integral slide.The deformation and instability of slopes are mainly located at the foot of the slope,followed by the middle of the slope,and the slope top is the smallest.It last 18～20 min for the deep slope to slide from significant deformation to instability,while the shallow slope to slide lasts 2～135 min.Slope instability and soil boundary water content can be significantly correlated with the failure process of slope instability.When the shallow soil water content of slope rises to 42％～45％,the slope begins to show signs of instability such as cracking and creep deformation.When the soil moisture content rises to 47％～50％,the soil on the slope begins to collapse and landslides and collapses quickly.
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