Research On The Impact Of Soft Soil Landslide

Soft soil landslides are kinds of landslide disaster and cause huge losses to human life and property.The phenomenon of soft soil slope is not obvious before the instability,but when the soft soil slope instability,it will cause a huge impact and damage to a series of structures such as buildings.Current research are more mature in exploring the causes for the stability and instability of soft soil slopes.However,there are few studies on the impact of soft soil slopes after instability.Therefore,the instability of the soft soil slope is still unclear in the sliding displacement and impact force.The main difficulties include the following points: In the past,there were few measurement equipments for the sliding displacement of the slope,many research used image processing technology or dial indicators to measure the surface or side displacement of the slope,therefore analyzing the sliding displacement of the slope roughly,and using transparent soil to analyze the displacement of the soil inside the slope.At the same time,more research is limited to the analysis of the stability of soft soil slopes,and there are few studies on the impact of soft soil slopes after instability.This research measured the displacement and impact force during the soft soil slope sliding process,which solved the problem of relying on transparent soil to measure the internal displacement of the slope in the past.MEMS sensors are used to measure the acceleration during the sliding of the soft soil slope,and the sliding displacement of the slope was calculated by the integral method.The research found that the change of the external load has little effect on the soft soil slope sliding distance,but it has a greater influence on the sliding time of the slope.As for external loads,the impact force will gradually increase during the soft soil slope sliding process.In order to better reflect the impact of soft soil slopes on structures,This research set model square piles in the model test.Through the impact of the side piles during the soft soil slope sliding process,This research found that the force of the square pile would suddenly increase and fall over during the accelerated sliding phase of the slope.At the same time,when the slope was accelerating,the impact force of the square pile would also reach the peak point.Numerical simulation of test slope with CEL method,the soil was modeled by Euler,and the components of the model box were modeled by Lagrange.In order to prove that the CEL method can be used for analying of soft soil slopes,this research compared simulation results data with test results.In the simulation results,the displacement and impact force change trends are basically consistent with the test trend,and the simulated landslide phenomenon is consistent with the test phenomenon.The impact force of the simulation result is greater than the impact force in the test,because the acceleration of the landslide in the simulation is greater than the acceleration value measured in the test.Through the sensitivity analysis of the soil density,external load size,slope height,slope angle,and undrained shear strength of the soil in the model.This research found slope angle is an important factor,and the undrained shear strength of the soil had a greater impact in the sliding displacement during the soft soil slope sliding process,and the external load and soil density had a smaller effect on the sliding displacement and impact force of the slope during the soft soil slope sliding process.