基于差分原理的重力坝深层抗滑稳定可靠度研究  

Research on the Reliability of Deep Anti-sliding Stability of Gravity Dam Based on Difference Method

作　　者：李向鹏 王刚[1] 李梦瑶 秦净净 LI Xiangpeng;WANG Gang;LI Mengyao;QIN Jingjing(School of Hydraulic Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China)

机构地区：[1]大连理工大学水利工程学院,辽宁大连116024

出　　处：《水力发电》2020年第9期88-92,共5页Water Power

基　　金：国家重点研发计划项目(2016YFC0401600,2016YFC0401900);国家自然科学基金项目(51309048)。

摘　　要：为分析重力坝双斜面深层抗滑稳定可靠度,依据刚体极限平衡等安全系数法建立的极限状态方程为隐式且非线性程度较高,传统验算点法难以直接应用,采用基于差分原理的二次二阶矩(SORM)可靠度方法有效解决了该问题并计算出单一双斜面滑移通道的可靠指标;当重力坝基岩地质条件复杂、存在多条滑移通道,且滑移通道间存在共结构面的关联性,则基岩整体构成一个失稳的串联系统,在前述方法的基础上采用体系可靠度宽窄界限法,提出了重力坝基岩整体抗滑稳定可靠度计算方法。结合重力坝典型工程案例,应用该方法研究了坝基深层各单一滑移通道的可靠度以及基岩整体稳定可靠度,并采用蒙特卡罗法(MC)验证了该方法的精度和适用性。When analyzing the deep anti-sliding stability reliability of double inclined planes of gravity dam foundation,the limit state equations established by the method of rigid body limit equilibrium are always implicit and highly nonlinear due to the unknown safety factors,and the traditional check point method in reliability analysis is difficult to be directly applied.The second order moment reliability method(SORM)based on the difference method can effectively be used to solve the problem and calculate the reliability index of every sliding path formed by the double inclined planes.Because of the complex geological conditions of the bedrock of gravity dam,the multiple sliding paths are always found,and the correlation of the different sliding paths can be existed due to the common sliding planes,so the overall bedrock can be viewed as a series system of instability.The anti-sliding stability reliability method for the whole bedrock of the gravity dam is proposed on the basis of the wide or narrow limit method in system reliability theory.For the typical gravity dam engineering case,the reliability indexes of each single sliding path in the dam foundation and the overall bedrock are studied by the proposed method,and the accuracy and applicability of the method are verified and compared by using Monte Carlo(MC)simulation.

关 键 词：重力坝 深层抗滑稳定性 差分原理 体系可靠度 

分 类 号：TV642.3[水利工程—水利水电工程]