摘要
鉴于地下连续墙用材量较大的缺陷,研究一种新型基础形式——地下连续墙与桩组合基础,为地下连续墙新技术的发展提供理论依据。文章针对水平荷载作用下地下连续墙-桩组合基础的水平承载性状,采用有限差分软件FLAC3D进行数值模拟分析,通过数值计算测点的位移、弯矩曲线研究,分析了组合基础在不同水平荷载、不同长度比、有无竖向荷载、土体弹性模量、内摩擦角、粘聚力等因素影响下的水平变形及内力变化规律。结果表明:荷载等级和墙桩长度比对组合基础的水平变形和内力变化影响敏感度较为突出,地下连续墙与桩的长度比为4:6时设计更合理;组合基础顶部以下1/2的部分是承担大部分水平变形和内力变化的位置,新型组合基础的受力特性符合了变刚度设计新理念,即变形大的位置增加刚度,减小变形,而变形小的地方则减小刚度,节省费用;新型组合基础上部和地下连续墙与桩的连接处存在两个最不利影响作用部位,需要着重考虑最不利影响问题。
Based on the defects of diaphragm wall with a large material,a research is made on a new type of foundation forms,diaphragm wall-piles combined foundation to provide a theoretical basis for the development of diaphragm wall.For further analysis of the horizontal bearing characteristics of diaphragm wall-piles combined foundation under lateral loading,by using the finite difference software FLAC3 D to make simulation,through the research on displacement and moment curve,the paper analyzes the results of diaphragm walls-piles combined foundation under the effect of horizontal force to discuss deformational and stress variation under the influence of factors the basis of forces at different levels,different length ratio,with or without vertical forces,modulus of elasticity,friction angle,cohesion,etc.The results show that Load rating and wall pile length ratio on the level of the composite foundation deformation and internal force changes affect sensitivity,and length of the diaphragm wall-piles design is more reasonable when the ratio is 4：6.Under the top half part of the combined foundation is the position assumed most of the horizontal deformation and internal force change.The force characteristics of the new combined foundation conform to the new design concept of variable stiffness that at the position of large deformation stiffness increases and deformation decreases,and at the position of small deformation the stiffness reduces;Two parts of the combined foundation needs to be considered about the adverse effects.
出处
《山东建筑大学学报》
2017年第1期47-54,共8页
Journal of Shandong Jianzhu University
基金
2014年山东建筑大学横向课题项目(山东电力工程咨询院有限公司
K22014016)
关键词
地下连续墙-桩组合基础
水平荷载
数值模拟
diaphragm wall-pile combined foundation
lateral loading
numerical analysis
