考虑流固耦合的拱坝抗滑稳定非概率可靠度分析

Anti-Sliding Stability Non-Probabilistic Reliability Analysis for Arch Dam Considering Fluid-Solid Coupling Effect

拱坝抗滑稳定可靠度分析是大坝安全评价的关键组成部分,其结果直接关系到大坝正常运行与安全,具有重要研究意义.已有的研究多采用概率可靠度方法进行分析,然而实际拱坝工程统计信息较少,难以获得各参数变量的精确概率分布;另外,目前缺乏考虑坝基岩体流固耦合作用的拱坝抗滑稳定可靠度研究.针对上述问题,基于凸模型理论,提出了考虑流固耦合作用下的拱坝三维抗滑稳定非概率可靠度分析方法,并通过建立拱坝三维工程地质统一模型,分别采用超载法与强度折减法,对流固耦合作用下拱坝抗滑稳定非概率可靠度进行探究.实际工程应用表明:本研究能够在缺乏足够统计信息的情况下对拱坝抗滑稳定可靠度进行分析,同时,未考虑流固耦合作用将高估拱坝的抗滑稳定可靠度,对工程安全不利.

The anti-sliding stability reliability analysis of arch dam is a crucial part of dam safety evaluation,the results of which are related to the dam operation and safety,hence it has important research significance.The existing study mostly adopted probabilistic reliability method.However,due to insufficient statistical information in practical engineering,it is difficult to obtain the exact probability distributions of parameter variables.Besides,there is short of research on anti-sliding stability reliability considering fluid-solid coupling of dam foundation.To address these limitations,based on convex set theory,a non-probabilistic reliability analysis of three dimensional anti-sliding stability for arch dam considering fluid-solid coupling effect was proposed.First,the three dimensional unified model of engineering geology was established.Next,considering the fluid-solid coupling in dam foundation,the anti-sliding stability non-probabilistic reliability was conducted by using overload and strength reduction methods.The results show that it is feasible to analyze the anti-sliding stability reliability of arch dam with meager statistical information by the proposed approach,and the safety assessment of arch dam is overestimated when the fluid-solid coupling effect is neglected,which is unfavorable to engineering safety.