Fuzzy random reliability analysis on outer shaft lining in the process of freezing method sinking for deep alluvium

Aiming at the shortcomings of the conventional reliability in characterization of structure stability,the fuzzy random reliability was analyzed to evaluate working condition of deep shaft lining. The corresponding fuzzy random functions and fuzzy random limit state equation were provided to improve the center point algorithm of fuzzy random re- liability. Combining fuzzy random analysis with shaft freezing pressure and shaft ultimate bearing capacity,the fuzzy random limit state equation was obtained for outer shaft lining structure of high strength reinforced concrete in deep al- luvium. Application of the improved center point method deduces the analytical range for the fuzzy random reliability of outer shaft lining structure,and put forward the fuzzy random reliability sensitivity range model of each variable. Engi- neering example shows for considering the uncertainty of all the parameters comprehensively,the fuzzy random reliabil- ity is generally lower than conventional reliability and reflects the actual engineering status better. In addition,the fuzzy random reliability with characterization of interval value is more reasonable than conventional reliability modus of fixed value manifestation.