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.
关键词
钢筋混凝土扶壁+卸荷板组合挡土墙/卸荷板/卸荷效应/高填方边坡/土压力分布
Key words
reinforced concrete counterfort and relief shelves composite retaining wall/relief shelves/unloading effect/high fill slope/earth pressure distribution
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