A Three-Dimensional Axisymmetric Arc Sliding Method for Checking Basal Heave Stability of Circular Foundation Pits

摘要

Nowadays, a large number of foundation pits in circular plane shape have appeared during urban construction in China. In the design process of the circular foundation pits, it is necessary to check their basal heave stability. Based on the circular arc sliding model of limit equilibrium method, a Three-dimensional Axisymmetric Arc Sliding Method (TAASM), in which the stiffness of the enclosure structure and the spatial effects are considered, was proposed. Furthermore, the TAASM was applied to check a practical engineering and its result was compared with those of other methods. The main conclusions are as follows: (a) The TAASM considers not only the effects of the enclosure structure stiffness and deformation but also the spatial effects of circular foundation pits on the sliding surface; (b) Compared with results of other plane algorithm methods, the result of TAASM is reasonable relatively; And (c) By TAASM, the calculated safety factor of basal heave stability for circular foundation pits will be larger than that by any other existing plane algorithm, so the embedded depth of enclosure structure may be optimized to lower the enclosure structure cost.