Analysis on the Interaction between Neighboring Circular Excavations in Saturated Cohesive Ground
The distribution of earth pressure behind circular excavations with small spacing is complicated,and it is difficult to determine the applicability of vertical elastic foundation beam method considering the arch effect and 3D spring slab method.The excavations of two circular accident emergency pools in saturated cohesive soil that are constructed by diaphragm wall with very small spacing are modelled by 3D continuum FEM method.The results show that the differences of maximum horizontal displacement and bending moment of diaphragm wall for the case of pool NO.1 excavated to the finial level and the case of pool NO.2 excavated to the final level are limited.The measured displacement and bending moment during construction deviate very little from the calculated values.The results indicated that even the spacing of two neighboring circular excavation is very small,the adverse interaction is very limited.Circular excavations retained by diaphragm wall is not sensitive to the stiffness of surrounding soil.The structural internal force of circular excavations calculated by 3D continuum FEM method is much smaller than that derived from vertical elastic foundation beam method considering the arch effect or 3D spring slab method,and obvious advantages in cost saving can be achieved.
circular excavationdiaphragm wallsaturated cohesive soil3D continuum FEM method
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