The Failure Process Model Test Of Dual Structure Slope And Mechanism Analysis Of The Interface Affect

With the demand of human activity,the development of engineering construction,the changing environmental conditions,the problems related to geotechnical slope is increasingly prominent,the analysis of slope stability and landslide has become very important.Many experts and scholars have been large and in-depth research on the soil slope and rock slope,so it has made gratifying achievements.Double-decked slope is often encounter in practical engineering,but the study and report of double-decked slope little.The valid judgment does not have been given between homogeneous soil slope and double-decked slope.Destructive form of double-decked slope is greatly affected by interface,how it affects have not been effectively answered.The paper carried out as follows for failure mechanism of the dual structure slope.In this paper,extract concepts model by typical actual dual structure slope failure.It is determine double-decked slope from homogeneous soil slope by breaking features of double-decked slope.Using strength reduction and determine the cohesion ratio limit of double-decked slope and homogeneous soil slope,considering the two factors of the interface location and angle of slope and using upper and lower cohesion ratio as a reference index.On this basis,detailed analysis the impact of ratio limit on the dual structure siope under different hardness circumstances.It is urgent need in-depth analysis the interface affect the dual structure slope stability mechanism and using the static load physical model test launched a series of experiments.It is carry out static load physical model test in order to study failure characteristics and interface effects of the dual structure slope better.Select used upper and lower soil similar material and through a large of number direct shear tests to determine different materials ratio.It is design five different forms of interface to study the damage characteristic of static load slope physical model tests and the influence of interface with slope failure form by gradually increasing load on the top of hill.The experiment preliminary results between soil displacement trajectory of siope and horizontal angle changes law and slope soil displacement variation law.Getting the same point and differences of slope failure form of different interface.Mechanical failure behavior of the dual structure slope is another key point of this paper so presented use numerical simulation tools.Numerical experiment has its own characteristics compared to the physical model test since data less affected by human factors.Physical test is not monitoring on the slope stress,so use numerical experiments supplementary and validate.According to the physical model dimensions,boundary conditions and soil parameters to establish the numerical model,monitoring slope soil displacement and stress for discussed the interface angle changes to different affect of upper and lower soil displacement.The interface is divided into inner and outside two part by midpoint,the more inner and outside clockwise rotation,the greater the impact on the lower soil displacement in the vertical direction,the more inner clockwise rotation and outside counterclockwise rotation,the greater the impact on the displacement of the upper layer of soil in the vertical direction.The form of interface impact stress distribution of the slope,which leading to different damage forms of the slope.Combining practical project to discusse the impact of dual structure slope with different weak interlayer forms.Shear strength of weak interlayer affect the plastic zone of slope and weak interlayer thickness have different effects on the factor of safety in different weak interlayer forms.The location of weak interlayer sliding surface relate to shear strength of weak interlayer,but irrelate to weak interlayer thickness.the sliding surface positions change different with the shear strength change in different weak interlayer forms.Based on the above study and consider to failure process of dual structure slope,selecting the appropriate reinforcement type and support ways by theoretical analysis and numerical simulation for siope reinforcement and optimization design to provide a new analysis ideas and methods.