基于抗滑极限状态的水工隧洞堵头可靠性分析

为分析水工隧洞堵头的可靠性,首先通过分析水工隧洞堵头的极限状态,建立了描述堵头可靠性的功能函数;其次在此基础上,利用ABAQUS建立了某水工隧洞堵头及围岩的三维有限元模型和描述堵头可靠性的功能函数显式表达式;最后利用设计验算点法计算原理编制了计算堵头可靠度的Matlab程序,计算了堵头可靠指标及失效概率,并对影响堵头与围岩接触面摩擦力的影响因素做了敏感性分析。结果表明,30m堵头的可靠性指标为6.602 7,失效概率为2.018 5×10~(-11);粘聚力越大,接触面摩擦力F_f越小;内摩擦角φ、弹性模量E越大,F_f越大。

Reliability Analysis of Hydraulic Tunnel Plug Based on Sliding Resistance Limit State

For the reliability of the hydraulic tunnel plug, the performance function of the hydraulic tunnel plug was established by analyzing the limit state of the plug. And then three-dimensional finite element model of the hydraulic tunnel plug and the surrounding rock was established by ABAQUS. The explicit performance function of the plug was obtained. According to the principle of design calculation point method, the Matlab program was designed to calculate the reliability index and failure probability of the plu. The sensitivity analysis is made on the factors that affected the friction between the plug and the surrounding rock. The results show that the reliability index of the 30-meter plug is 6.602 7, and the failure probability of the plug is 2.018 5×10-11. The friction of contact surface decreased with the increase of cohesion, and which increased with the increase of the internal friction angle and the elastic modulus.