Research On The Influence Of Pile-anchor Reinforcement On The Highway Slope Of The Reservoir Bank

There are substantial reservoir bank roads and more reservoir area highway construction and maintenance because of economic development and engineering construction.The paper is taking the Lengqing highway reservoir slope as an example,considering the bank slope is greatly affected by water,combining the seepage theory of unsaturated soil and the coupling theory of flow field and stress field,further studying the slope reinforcement mechanism and effect.The research of this project can not only provide help for the maintenance of existing reservoir area roads and the design of new highways,but also provide useful reference for the safety and security of other engineering facilities.The main conclusions as follows:(1)The basic principle,trait and applicable range of pile and anchor reinforcement on bank slope of reservoir are summarized,which provides the basis for the design of reinforcement in practical engineering.(2)The two dimensional saturated-unsaturated seepage model of reservoir bank highway slope is established.It studies the influence of cohesion,internal friction angle,water level change and permeability coefficient on slope safety factor.The safety factor of bank slope increases with the increase of internal friction angle and cohesion of soil.When the static water level(without seepage within the slope),the safety factor first decreases and then increases with the height of the reservoir water level.When seepage exists in the slope,the safety factor increases as the water level rises,and decreases first and then increases as the water level decreases.The larger water level variation rate is favorable to the slope safety factor when the water level is rising but decreasing.The larger permeability coefficient is adverse for slope body safety factor when the water level is rising but decreasing.(3)The simulation analysis has obtained the evolution law of the seepage field,displacement field,stress field and safety factor of the bank slope before and after pile and anchor reinforcement in the change of reservoir water level.After pile or anchor reinforcement:the permeability coefficient in the area and the seepage path in the slope have changed,thus the infiltration line and pore water pressure are changed;The displacementtendency,value and difference with water level is changed,which is more beneficial to the slope and pavement;The maximum and minimum principal stress and maximum shear stress are ameliorated;The change trend of slope safety factor with water level after reinforcement of pile and anchor are similar to the unreinforced slope,but the safety factor has been largely improved.