Study On Dynamic Response Of Accumulation Of Rock Mass In Highway Projects

According to property,slope can be devided into rock slope and soil slope. As a kind of rock slopes,slope of accumulation of rock mass has special geological conditions.It is formed by rock crumb which produced by physical and chemical action. The ways to analyze dynamic stability problem of rock slope can be classified as pseudo-static methods and numerical simulation methods. Although the achievements of Pseudo-static methods are abundant and theoretical systems matured, it still has many obvious defects.Based on the finite difference method,FLAC program is used widely in rock and soil engineering world.But little scholar make research on permanent displacement of slope committed by dynamic load.Especially in the past two years,earthquakes occured frequently.After all,it id necessary for us to make research on permanent displacement of slope commetted by dynamic load.This article summarizes the problem of slope dynamic situation.Based on the finite difference principle, a detailed summary and analysis of the dynamic solution method, the finite difference program FLAC software on the rock pile slope of the permanent displacement of a detailed analysis of the factors, including the frequency, duration, amplitude, and slope angle high five. Mainly to carry out the following work:(1)On the basis of previous achievements,the influence factor of slope stability under dynamic loads is classified as geological background,combination of the structure of slope an rock mass properties,conditions of terrain and landform and hydrogeology condition.(2)The paper describes the finite difference method detailly.The method to solve dynamic equation is summaried and analyzed.Dynamic equation and computing methods,nonlinear dynamic equation and calculation methods, Mohr-Colunm elastoplastic constitutive relations ang yield critertion are also discussed.(3)The influence patten of viscoelasticity boundary under equation of rock slope is discussed.The main following works has been done in this paper,①the influence of slope pernament displacement made by dynamic duration is dicussed, with increasing duration,the slope permanent displaceent increased.②the influence of slope permanent displacement made by frequency is debated in the paper,with increasing frequency,the slope permanent displacement is reduced all the while,③the influence of slope permanent displacement made by amplitude of vibration,④the influence of slope permanent displacement made by slope altitude,⑤the influence of slope permanent displacement made by slope angle.(4)Based on SanLiHua slope of acummulation of rock mass of YiBa highway projects,the paper has done nemerical simulated computation used flac2d program. And finally the dynamic response of SanLiHua acummulation of rock mass under seimic loade named kobe are analyzed,and some useful conlusions derived.