Study on unloading effect of reinforced concrete counterfort and relief shelf composite retaining wall
The huge earth pressures acting on the retaining structure of high fill slopes lead to great internal forces and high engineering costs.In order to solve the problems above,the reinforced concrete counterfort and relief shelves composite retaining wall is proposed.The unloading effect of relief shelves is used to reduce the earth pressure behind the wall,and reduce structural internal forces.Combining the Coulomb theory with Klein method,the lateral earth pressure calculation method of the composite retaining wall is obtained.For some 20.5m in height high fill slope project,the lateral earth pressure calculation method is used,and the unloading effect influences are studied through a variety of combination schemes.The results show that,the maximum values of structural shear force and bending moment of composite retaining wall are nearly 1/3 smaller than those of counterfort retaining wall.The field test results are in good agreement with the theoretical results.The main factors affecting the unloading effect are the buried depth and length of relief shelf.To balance structural shear forces and bending moments,the optimal scheme is that the buried depth of relief shelf is the middle position of retaining wall height,and the ratio of relief shelf length to the corresponding retaining wall height is from 1.2 to 1.5.
reinforced concrete counterfort and relief shelves composite retaining wallrelief shelvesunloading effecthigh fill slopeearth pressure distribution
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