The unstable mode of the rigid pile structure is mainly the pressure instability of soil at the pile side in the anchoring section. According to the extreme values of the pile's side pressure at the two depth places below the anti-slide pile surface, the structure functions are respectively established to analyze the reliability of anchoring depth for rigid anti-slide piles under the two extreme values, and then with the consideration of the randomness and fuzziness in the reliability analysis for the antislide pile structure, the fuzzy random reliability analysis model is established. Taking the calculation of a rigid anti-slide pile for example, the fuzzy reliability index and fuzzy reliability of the structure are obtained, and the calculated results are consistent with the classical theory limit state factors.
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