摘要
针对弹性地基反力法中没有考虑地基土的水平基床系数随围护墙水平位移而变化的问题,根据基坑工程中土抗力与支护结构位移之间的非线性共同作用,建立了一个非线性土抗力模型.基于此模型提出一个考虑土-基坑支护结构非线性共同作用的弹性地基反力法.在该方法中,采用以解除围护墙前侧向土压力的方法模拟基坑开挖作用,并考虑了由于开挖而产生的墙前土体弹簧刚度软化以及由此引起的应力重分布和附加变形.编制计算程序并分析了基坑工程实例中各工况支护结构的受力与变形.计算结果表明,按提出的分析方法计算的围护墙体位移比按现行规程设计方法计算的更接近实测结果,且计算参数的确定较为方便.
In excavation engineering, the horizontal coefficient of subgrade reaction is irrelevant to horizontal displacement of retaining structures in the elastic subgrade reaction method. Reflecting this, a nonlinear soil reaction model was established reflecting nonlinear interaction between soil reaction and retaining structure displacement. Based on this model, an elastic subgrade reaction method considering nonlinear interaction between soil and retaining structure was developed for excavation engineering. In this method, the process of excavation was simulated by introducing a lateral earth pressure removal method in front of the retaining structure. Softening of the stiffness of soil spring induced by excavation and the redistribution of stress and additional deformation caused by softening were also considered. Then a computer program was written to calculate loading and deformation of the retaining structure during different construction stages in a given situation. The results calculated show the retaining structure displacements derived by this method are closer to actual displacements than those derived by the method suggested in the design code. Furthermore, these calculation parameters can be conveniently obtained.
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2009年第8期872-877,共6页
Journal of Harbin Engineering University
基金
国家自然科学基金资助项目(50508012)
黑龙江省博士后科研启动基金资助项目(LBH-Q06065)
关键词
非线性共同作用
弹性地基反力法
非线性土抗力模型
刚度软化
nonlinear interaction
elastic subgrade reaction method
nonlinear soil reaction model
softening of stiffness
