Numerical Simulation Of Double Row Pile-Anchor Supporting Structure

With the development of economic and urban construction, more and more high-rise buildings around us. These high-level and high-rise buildings makes the foundation pit gradually deepened, gradually increasing complexity, more and more way of foundation pit supporting around us, from the cantilever pile retaining to the pile-anchor, double-row piles to double row pile-anchor supporting, the theoretical research on the foundation pit support system, the design and construction techniques are constantly developed. This support approach will make double-row piles and anchor form an effective whole by rational designing, and give full play to both technological advantages. Double-pile composite anchor has good economic benefits in controlling the deformation. But the double pile-anchor support structure has not yet been widely used in the foundation pit support, and the theoretical research has not expanded in-depth, combined with the results of previous studies based on specific works on the double pile Bolt Support Structure system, in-depth study. The specific findings are as follows:(1) Describes the emergence and development of the double pile structure and anchor structure, and pointed out the advantages, disadvantages and limitations of these two structures.(2) Summarizes the calculation model and calculation method of the double-pile structure and anchor cable structure, and to make the comparison, pointing out that the force characteristics of the structure of these models to determine these calculations model shortcomings and scope of the calculation methods.(3) Based on existing theory, using the finite difference software FLAC3D double pile retaining deep foundation excavation process was simulated, in-depth analysis, in the double cantilever pile retaining, double pile composite anchor rod (no stress)support and double pile composite prestressing bolt support all three cases, the displacement of the foundation pit soil, pile internal forces and deformations.(4) FLAC3D numerical simulation and analysis of the front and rear pile diameter, pile length, pitch, pit depth, length of rock bolt, the bolt prestressing bolt anchor location on the double pile retaining traits the impact of the optimization of double pile support design some practical suggestions.