钢筋混凝土扶壁卸荷板组合挡土墙卸荷效应研究  

Study on unloading effect of reinforced concrete counterfort and relief shelf composite retaining wall

作　　者：杨淼 董建勋 肖胜寒 郭昊 YANG Miao;DONG Jianxun;XIAO Shenghan;GUO Hao(China Northeast Architectural Design&Research Institute Co.,Ltd.,Shenyang 110003,China;ZJDS Geotechnical Engineering Co.,Ltd.,Shenyang 110003,China)

机构地区：[1]中国建筑东北设计研究院有限公司,辽宁沈阳110003 [2]中建东设岩土工程有限公司,辽宁沈阳110003

出　　处：《混凝土》2024年第3期182-187,共6页Concrete

摘　　要：为了解决高填方边坡挡土结构内力大和工程成本高等难题,提出钢筋混凝土扶壁+卸荷板组合挡土墙形式,利用卸荷板的卸荷效应,降低墙后土压力,减小结构内力。将库伦滑动楔体理论和Klein方法结合,给出组合挡土墙土压力计算方法和挡土墙理论计算方法。针对大连20.5 m高填方边坡工程,采用组合挡土墙方案及理论计算方法,并研究组合挡土墙卸荷效应影响因素。结果表明:组合挡土墙结构剪力和弯矩的最大值均比扶壁式挡土墙的小将近1/3;现场监测结果与理论计算结果比较接近;影响组合挡土墙卸荷效应的因素主要是卸荷板埋置深度和卸荷板长度;从结构剪力及弯矩均衡的角度考虑,卸荷板最优设置方案为,卸荷板埋置深度为挡土墙高度的中间位置,卸荷板长度与其对应的挡墙段高度比值为1.2~1.5。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 

分 类 号：TU528.571[建筑科学—建筑技术科学]