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深基坑是一个具有长度、宽度、深度的三维空间结构体系。现行设计规范中将其简化为二维平面应变问题进行分析计算,不能反映基坑的空间性状和尺寸效应。基于弹性抗力法引入土压力发挥系数的概念,提出了土压力发挥系数的计算方法。提出基坑悬臂支护结构顶部冠梁的水平位移与简支梁受均布荷载作用下的水平位移具有相似的形式,在此基础上计算深基坑悬臂支护结构上土压力发挥系数、支护结构变形和内力的空间分布规律。工程实例计算表明:考虑土压力空间效应得到的基坑变形与实测结果相符合。
Deep foundation pit is a three-dimensional structure system with length, width and depth. In the current design code, it is simplified to two-dimensional plane strain problem to analyze and calculate, which can not reflect the space character and size effect of foundation pit. The concept of earth pressure exerting coefficient is introduced based on elastic resistance method, and the calculation method of earth pressure exerting coefficient is put forward. It is proposed that the horizontal displacement of crown beam at the top of cantilever retaining structure of foundation pit is similar to that of horizontal displacement of simply supported beam subjected to uniform load. Based on this, the earth pressure exertion coefficient on cantilever retaining structure of deep foundation pit is calculated. Spatial distribution of deformation and internal forces. The calculation of engineering example shows that the deformation of foundation pit obtained by considering the space effect of earth pressure conforms to the measured result.