Earth Pressure On Retaining Wall Considering Stability And Safety Factor Under Non-Limit State

Retaining wall refers to the support subgrade fill or hillside soil,to prevent filling or soil deformation instability structure.It is widely used in civil engineering,water conservancy,hydropower,road transport,railway and bridge engineering reinforcement.If the rock and soil instability occurs under natural or man-made factors,it may have serious consequences,even endanger human life and property safety.Earth pressure is the lateral pressure generated by the backfill on the back of the retaining wall,which is an important basis for retaining wall design.At present,the calculation of earth pressure on retaining walls mostly uses Coulomb's earth pressure theory and Rankine earth's pressure theory,which have so far been widely recognized and applied in engineering field.These two classic methods of calculating earth pressure are based on the state of the soil reaching the limit after the wall was established.However,under the general working condition of the earth retaining wall,the pressure of the soil cannot reach the limit,and is still between the earth pressure and the active earth pressure,which can be confirmed from the existing earth pressure monitoring data.With the development of civil engineering science and the improvement of safety requirements in civil engineering in recent years,the calculation of earth pressure on retaining wall in non-limit state has become an important research topic.Based on the basic mechanics,this paper discusses and studies the calculation method of earth pressure on retaining wall under the non-limit state with safety factor control.The research work done in this paper is as follows:(1)Consider the backfill of retaining wall as a kind of slope,then use the concept of safety factor in slope engineering to study the earth pressure of retaining wall in non-limit state.The wedge-shaped sliding block of the post-retaining wall and the sliding rupture surface are studied as a slope system,and it is straightforward to prove that under the condition of ultimate static equilibrium,the stability safety coefficient of the retaining wall is 1.0.(2)Apply the method of solving the safety factor in slope engineering to deduce the formula of solving the friction angles under different safety factors.(3)For the sake of stability,obtain the values of the friction angles in the fill soil and the wall soil when the safety factor is controlled at 1.25.The retaining wall and the backfill will be divided into three cases according to different stress states.The coulomb limit equilibrium theory is improved and the formula for calculating the active and passive earth pressures is deduced.Analyzing different types of retaining walls with this theory and comparing the results with Coulomb's earth pressure theory demonstrates the significance of this study.(4)Apply the finite element analysis method to simulate the retaining wall in order to verify this theory.