摘要
基于地下连续墙分幅施工的工程实际状况,建立了连续墙不抗弯不抗剪柔性接头、抗剪不抗弯半刚性接头以及抗剪又抗弯刚性接头的力学模型。结合南京纬三路过江隧道盾构工作井地下连续墙的设计,通过数值模拟,研究了连续墙接头型式对于墙体水平位移以及支护体系受力的影响规律。研究成果表明,在做好连续墙接头防渗的前提下,采用柔性接头时墙体的水平位移较大,支护体系内力明显增高;采用半刚性接头时既可以有效地限制墙体的水平位移,又可以将墙体承担的土压力分担到临时支撑和环梁之上,降低连续墙墙体的内力;采用刚性接头时可以降低临时支撑、环梁以及内衬的内力,但连续墙墙体要能承担极大的竖向弯矩和数值相当的横向弯矩。综合考虑建议工作井采用抗剪不抗弯的半刚性接头。
Three mechanical models of diaphragm wall joint,i.e.flexible joint without resistance to shearing and bending,relative rigid joint with resistance to shearing and absolute rigid joint with resistance to shearing and bending,are established based on different effects of transverse stress transferring.In order to choose a reasonable joint for shield working well of Nanjing Weisan-road Yangtze River tunnel,the deformation and mechanical properties of diaphragm wall are analyzed by using above models.The results show that： flexible joint is easy to cause the increase in displacement of diaphragm wall and soil;and finally,leads to increase internal force of supports.Relative rigid joint are able to not only resist the displacement of diaphragm wall,but also decrease stress of diaphragm wall by transferring the stress to the temporary supports and ring beams;Absolute rigid joint may result in diaphragm wall undertake significant transverse and longitudinal moment.By comprehensive consideration,the relative rigid joint is chosen for the working well.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2011年第10期2937-2943,2950,共8页
Rock and Soil Mechanics
基金
国家自然科学基金资助(No.41072238
No.51009133
No.51004097)
国家自然科学基金重大国际合作项目资助(No.50720135906)
关键词
盾构工作井
地下连续墙
接头模型
数值模拟
shield working well
diaphragm wall
joint model
numerical simulation
