| Summary: | [Objective] Foundation pit retaining piles play a vital role in building construction. In order to ensure the safety and stability of foundation pit construction, it is necessary to make in-depth study on the stress distribution law of stratum support under the action of foundation pit retaining piles. [Method] The analysis model and theoretical calculation formula upon the stratum internal support under the action of retaining piles are put forward. Based on the solution method of the uniform stress in the half-arc plane of elasticity, the distribution law of soil internal support stress between piles is deduced and analyzed under different retaining pile distances. The mechanical mechanism of the soil arch between the piles and under the foundation pit retaining piles is revealed. The stratum support stress under the action of the retaining piles is calculated and analyzed with the example of Linjiazhuang Station on Jinan Metro Line 4. [Result & Conclusion] Under the pile side soil pressure, the support stress of the surrounding stratum decreases with the increase of pile distance. At the same pile spacing, the support stress of surrounding stratum increases with the increase of pile side soil pressure. The continuous support stress inside the stratum and reasonable pile spacing are the key to ensure effective arch formation of the retaining piles.
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