Analysis Method Of Retaining Wall Earth Pressure Based On Principal Stress Trajectory To Divide Curve Unit

In actual engineering,the retaining wall has a rough wall back structure,which is different from the ideal condition of absolute smooth wall back in the classic theory.With various experiments on earth pressure,the influence of the friction between the back of the wall and the soil on the earth pressure has gradually become a research hotspot of scholars.However,there are some shortcomings in these research which based on classical theoretical research ideas or mainstream linear layered analysis methods,and various unreasonable simplifications have been made.It is difficult to study the influence of the friction between the wall back and the backfill on the earth pressure from the microscopic perspective.First of all,this paper studies the variation law of the principal stress of the soil micro-element under the influence of the friction between the wall back and the fill.On this basis,this paper obtains the arc-shaped principal stress trajectory equation expressed by the geometric equation.Then,the sliding soil is layered along the maximum principal stress trajectory,and the arc-shaped curve differential unit is obtained in this paper.By studying the forces of the differential unit in the active and passive states,the corresponding earth pressure analysis models are established respectively.Combining the force balance conditions and boundary conditions of the differential element to obtain the calculation formula of the earth pressure strength,a new method for analyzing the earth pressure of the cohesive soil retaining wall based on the maximum principal stress trace under the active and passive states is formed.Finally,by comparing the calculated value obtained by this method with the calculated value obtained by earth pressure test and other methods,it shows the rationality of the analysis method in this paper under active and passive conditions.By studying the influence of wall-soil friction angle,internal friction angle and other factors on the earth pressure strength,friction stress,and earth pressure coefficient in active and passive states,the influence law of each factor is discussed.