摘要
新型装配扶壁式挡土墙具有环保美观,施工速度快的优点,但存在新老混凝土结合面及拼接缝,影响结构整体性。结合宿迁市马陵河整治工程,采用有限元法,研究了该挡土墙结构在设计地震作用下应力、变形特性,并预测了其极限抗震能力,分析了新老混凝土结合面强度参数对结构抗震性能的影响。结果表明,在设计地震作用下,新老混凝土结合面剪应力小于抗滑力,剪切变形很小,属弹性变形,结合面黏结良好;拼接缝处面板拉应力远小于混凝土抗拉强度设计值;预测超载的挡土墙极限抗震能力为0.50 g;接触面摩擦系数在0.4以上,结构可保证整体性,抗震能力较强,摩擦系数降至0.2以下,结构抗震能力显著降低。该工程新型装配扶壁式挡土墙的抗震安全性满足要求,技术方案是可行的。
New assembly buttressed retaining wall structure has its own advantages, such as environment-friendliness, beauty and rapidity, but there are the joint faces between the old and new concrete and joint affecting the integrity of the retaining wall structures. By using the finite element method based on the regulation project of Maling River in Suqian City, the law of stress and deformation of new assembly buttressed retaining wall under earthquake action, the ultimate aseismic capacity, the influence on seismic behavior of the structure by different parameters of the joint faces are studied. The results show that the shear stress of the joint faces between the old and new concrete is smaller than the anti-sliding force, elastic shear deformation is small and meets the application requirements. The tensile stress in the joint is far less than the tensile strength of concrete. The ultimate seismic capacity of new assembly buttressed retaining wall is 0.50 times the gravitational acceleration by overload method. The structure has equivalent seismic capacity when the friction is not less than 0.4, the seismic capacity decreased significantly when the friction is 0.2. New assembly buttressed retaining the wall of the project meets the safety requirements and the technical scheme is feasible.
作者
章宏生
沈振中
徐力群
叶兴成
刘益志
ZHANG Hong-sheng SHEN Zhen-zhong XU Li-qun YE Xing-cheng LIU Yi-zhi(College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China Suqian Water Authority, Suqian 223800, Jiangsu Province, China)
出处
《中国农村水利水电》
北大核心
2017年第3期121-125,共5页
China Rural Water and Hydropower
基金
国家自然科学基金项目(51279054)
江苏省水利科技项目(20168048916)
关键词
装配扶壁式挡土墙
结合面
拼接缝
抗震性能
有限元法
assembly buttressed retaining wall
joint faces
joint
seismic behavior
finite element method
