盾构隧道地表沉降模糊随机可靠度分析

Fuzzy Random Reliability Analysis of Ground Surface Settlement about Shield Tunnel

盾构隧道施工引起地表沉降的计算方法已较为成熟,但由于引起地表沉降的因素存在随机性和模糊性,运用传统方法对隧道地表沉降进行可靠度分析不够准确。为此,基于Peck公式,考虑沉降因素的随机性和模糊性,运用一次二阶矩法计算结构可靠度,并与传统方法进行对比。研究表明:此方法可靠性更高,对工程实践具有重要意义。

The calculation method of ground settlement caused by shield tunnel construction has been relatively mature, but since the randomness and fuzziness of the element that caused the ground settlement, using the traditional method to tunnel surface settlement reliability analysis is not accurate enough. In this paper, based on the Peck formu-la, the randomness and fuzziness of subsidence factor is concerned, respectively using First order second moment method to calculate the structure reliability and compare with the traditional method. The results show that u-sing this method the reliablity is higher and it is important for engineering practice.