Research On Deformation Law And Control Technology Of High Fill Slope Under Soft And Hard Base Conditions

High-fill slopes are large-scale geotechnical man-made projects.Due to their large height and scale,steep slopes,and poor base conditions,they are prone to instability and damage under extreme weather conditions,resulting in serious losses to life and property..Therefore,this paper combines two engineering examples of a hard rock base high fill slope in a ski resort in Laishui and a soft rock base high fill muck field slope in Qian’an,starting from the two dimensions of stiffness and strength,for high fill Under the premise that the slope of the ski resort can neither be deformed nor damaged,and the slope of the high-fill muck field is allowed to have a certain deformation but not allowed to be damaged,the slope of the high-fill soil slides under different hard and soft base conditions and rainfall conditions respectively.The mechanism of displacement and deformation and its stability are studied,and its prevention and control measures are proposed.The main research contents are as follows:(1)Taking the slope of the ski resort with hard base and high fill as the research object,the settlement,displacement change characteristics and stress-strain distribution characteristics of the slope under natural working conditions were simulated and analyzed by numerical simulation method.The stability of the local danger zone is evaluated and its safe state is determined.(2)The rainfall infiltration characteristics and slip failure characteristics of the slope with high fill under different rainfall conditions were revealed,and the limit equilibrium method and strength reduction method were used to evaluate the stability;For the problem of migration and damage,grouting protection measures and stability evaluation of high fill slopes were taken.(3)In view of the instability characteristics of the slope of the high fill ski resort,the residual thrust method was used to evaluate the residual thrust distribution characteristics between the sliders;for the dangerous area,the conventional prestressed anchor cable and the enlarged head prestressed anchor cable were used.The reinforcement design was carried out with various schemes,and the optimized reinforcement design scheme was determined;meanwhile,the drainage measures were designed for the filling body.(4)For the soft base high-fill muck field slope formed by tailings sand,the rainfall parameters were determined in combination with the local historical rainfall data and the precipitation intensity classification standard promulgated by the National Meteorological Administration,and the deformation and evolution characteristics of the muck field were systematically simulated and studied.,revealed the chain-type deformation evolution mechanism of the soft-base high-fill slag yard slope after stacking,and evaluated the soft-base bearing capacity and slope safety.(5)In view of the instability and failure characteristics of the soft base and high fill muck field,the comprehensive control measures combining slope reduction and load reduction and drainage were adopted to design the scheme,and the optimized design scheme was determined.