Characteristics Of Earth Pressure Acting On Counterweight Embankment Retaining Structure And Design Keys Technology Research

There are many factors that affect the calculation of the earth pressure of the counterweight retaining Structure,especially the second rupture surface on the upper Structure,which brings trouble to the calculation of the earth pressure.In addition,the earth pressure of the upper and lower Structures of the counterweight embankment retaining Structure have mutual influence with the change of displacement.The results obtained by the commonly used earth pressure calculation method differ from the actual situation to different degrees.It is necessary to establish a more realistic upper and lower Calculation method of earth pressure on the lower Structure,especially on the upper Structure.In this paper,the finite element simulation calculation is used as a research method to carry out the relevant research on the earth pressure of the weighted embankment retaining Structure.First,the verification calculation of the earth pressure on the back of the retaining Structure under simple boundary conditions is carried out.After the calculation results are reasonable,the weighted design is designed.Standard working conditions of embankment retaining Structure,the control variables change the displacement mode of the retaining Structure,the height of the embankment,the strength index of the backfill of the Structure,the embankment slope,the width of the load-bearing platform,the height of the Structure and the ratio of the upper and lower Structures,etc.Impact.And for the failure of the balance weight retaining Structure that often appears on the upper Structure,an orthogonal test is designed,and the degree of influence of each factor and the interaction between the factors on the earth pressure value of the upper Structure is analyzed by progressive optimization linear regression.The following conclusions are obtained:(1)The different displacement modes of the retaining Structure will lead to different earth pressures of the retaining Structure.In the rotation mode of the retaining Structure around the heel,the calculated value of the finite element is closest to the theoretical analytical value.Only under this kind of working condition will the Structure appear.The two fracture surfaces are the same as the assumptions made by the theoretical analysis.In addition,the earth pressure values of the upper Structure and the load-bearing platform generated in the translation mode are greater than the earth pressure values generated in the displacement mode around the Structure heel and the toe around the Structure,and the earth pressure values of the lower Structure generated by the rotation around the Structure heel are three types The largest in displacement mode.(2)As the height of the embankment and the height of the counterweight retaining Structure increase,the earth pressure on the back of the Structure also increases.The construction of high embankments and high retaining Structures should be avoided during construction.In addition,the embankment with a gentle slope should be filled.Selecting a filler with a large internal friction angle can effectively improve the stress condition of the Structure back.(3)Through the progressive optimization linear regression analysis method,the degree of influence of each factor on the earth pressure of the upper Structure under the coupled displacement mode of 50% of translation and rotation can be obtained.Among them,the height of the embankment has the greatest influence on the earth pressure on the upper Structure,followed by the width of the load-bearing platform,the Structure height,the internal friction angle of the fill and the slope of the embankment.The ratio of the upper and lower Structures has the least influence on the earth pressure on the upper Structure.