基于灰关联理论的围岩参数敏感性分析

针对围岩参数存在不确定性的问题,采用灰关联理论,分析了参数在一定范围内变化时对围岩稳定的影响,并以大渡河上某电站泄洪洞闸室为例,选取围岩体积模量、剪切模量、内摩擦角、粘聚力等为敏感性影响参数,确定点安全系数为评价指标,对开挖完成后洞室典型断面点安全系数的影响因素进行敏感性分析。结果表明,围岩参数变化对开挖后洞室断面的特征点安全系数影响程度由大到小依次为内摩擦角、粘聚力、剪切模量、体积模量。

Sensitivity Analysis of Rock Parameters Based on Grey Relation Theory

For the uncertainty of rock parameters, grey relation theory is adopted to analyze the influence of parameters on the stability of the rock. Taking flood discharge tunnel of a hydropower station in Daduhe River for an example, volume modulus, shear modulus, angle of internal friction and cohesion are confirmed as sensitivity influencing parameters. And then the point safety factor is selected as evaluation index. Finally, the sensitivity analysis of influencing factors for point safety factor of excavated typical sections has been conducted. The results show that the influencing effect of point safety factor is different when the parameter changes; the order of the influential degree of cavern typical section on point safety factor for serious level to light level is: angle of internal friction, cohesion, shear modulus and volume modulus.