闸室抗滑稳定的模糊随机可靠度分析

Fuzzy Random Reliability Analysis of Lock Chamber Anti-sliding Stability

针对水闸观测数据偏少,水闸闸室稳定分析中出现的大量不确定因素等问题,在刚体极限平衡法的基础上,结合随机可靠度和模糊数学理论,对节制闸闸室抗滑稳定性模糊随机可靠度进行综合探讨。选取某水闸为例,考虑地基抗剪断参数的模糊随机性,对摩擦系数f、粘聚力c等模糊随机变量采用模糊截集,将闸室失稳状态和稳定状态之间的界限采用隶属度函数模糊化,考虑水平截集、参数负相关性、隶属函数的不同取值界限以及失效准则隶属函数选取对可靠指标的影响。对比计算结果可知,模糊可靠度更能真实反映闸室抗滑的稳定性,为闸室抗滑可靠性研究提供了一种新的方法。

In view of less sluice observation data and large number of uncertain factors in sluice stability analysis,the fuzzy random reliability analysis of lock chamber anti-sliding stability of sluice gate is explored based on the rigid body limit equilibrium method combined with the reliability and fuzzy mathematics theory.Taking a sluice as an example,the fuzzy random reliability is analyzed,in which,the fuzzy randomness of the ground shear resistance parameters is considered,the fuzzy cut set is used to fuzzy variables such as friction coefficient f and cohesion c,the boundary between the instability state and the steady state of lock chamber is blurred by the membership function,the value limits of the level cut sets,the negative correlation of parameters,the different value limits of the membership function are considered,and the influence of the failure criterion membership function on the reliability index is also considered.The comparison of calculation results shows that the fuzzy reliability can more accurately reflect the anti-sliding stability of lock chamber,which provides a new method for the study of anti-sliding reliability of lock chamber.