Research on the Reasonable Pile Spacing of Micro-Pile Composite Structure Considering Soil Arching Effect

At present, the pile spacing of micro-pile and micro-pile combination anti-skid structure is generally determined by engineering experience, which greatly affects the anti-skid performance. To solve this problem, the axis of the soil arch between piles is assumed to be parabola. Then, the maximum pile spacing formula is given under the control condition that the soil at the arch crown or arch foot reaches the limit state. The rationality is verified by comparing it with the model test results. On this basis, considering the interaction between soil arches between piles and soil arches among pile groups, a simplified calculation model of pile spacing of the structure is established and applied to a simplified engineering example. The results obtained are compared with the numerical simulation results, and the rationality is verified. The calculation model of pile spacing established in this paper can provide a theoretical basis for the pile location of the micropile group.