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基坑工程中的坑中坑问题是一个非常普遍但又没有进行深入研究的问题。以坑中坑为研究对象,将其分为内坑与外坑,按内、外坑的相对位置关系将各区域进行了划分。提出了表现坑中坑特点的4个参数,即:内、外坑面积比m、内、外坑深度比h、坑趾系数U、内坑挡墙插入比α。采用有限元软件ANSYS建立典型坑中坑数值模型,详细分析了坑中坑各参数m、h、U、α变化对大基坑应力场的影响,从中得出了影响最大的参数,坑中坑最敏感的应力区等有益结论。
The pit pit problem in the pit engineering is a very common problem that has not been studied thoroughly. Taking the pit in the pit as the research object, it is divided into inner pit and outer pit. According to the relative positions of inner pit and outer pit, the regions are divided. The four parameters that characterize the pits in the pit are proposed, namely, the inner and outer pit area ratio m, the inner and outer pit depth ratio h, the pit toe coefficient U and the inner pit retaining wall insertion ratio α. The finite element software ANSYS is used to establish the typical pit model. The influence of the variation of m, h, U and α parameters on the stress field is analyzed in detail. The most influential parameters are obtained. The most sensitive stress zone and other beneficial conclusions.