ABSTRACT
A calculating model of the pile-prestressed anchor supporting structures for the excavation is proposed. In terms of the property of the pile-prestressed anchor supporting structures, the calculating model is given which deals with the prestressed anchors as the elastic supports of the pile body. Through the iterative calculations of the whole procedure, the internal forces of the pile and tensile force of the prestressed anchors that the pile cooperates with the prestressed anchors and the soil mass can be solved by the finite element method. Based on the pre-stress magnitudes of the anchors and soil pressure acting on the pile, the horizontal displacements of the supporting structure can be calculated. In teams of the constraint conditions of the strength, stability and displacements of the pile-prestressed anchor supporting structure, the optimal design of the supporting structure can be obtained by the iterative method. According to the proposal method, the calculating solution would match the real case record and it ensures: (1) the pile-prestressed anchor supporting structure is safe in the excavation and after it is used, (2) the horizontal displacements of the pile-prestressed anchor supporting structure can be solved, (3) the most economic supporting structure are achieved. The method is applied to a case record for illustration of its capability. The case record involved an analysis and design of pile-prestressed anchor supporting structure in the loess deposit in China and the deformation monitoring in the excavation. The results show that the design and the construction were safe and credible using the proposal method.
