Abstract
The foundation pit is a three-dimensional space system with length, width and height. The current code is designed according to the plane problem. It does not consider the space effect of foundation pit. Based on the numerical model, the effects of the ratio of depth to length and the ratio of the distance of pit angle to the length of pit on the spatial effect was studied. It provides the basis for optimal design of deep foundation pit. The results are as follows, when the ratio of depth to length of foundation pit is less than 1/8, the deformation in the middle of foundation pit is close to that in plane strain design. The influence coefficient of foundation pit space changes exponentially with the ratio of the distance of pit angle to the length of pit edge. The influence coefficient of foundation pit space changes exponentially with the ratio of foundation excavation depth to pit length.
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