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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。
In view of the uncertainty of the surrounding rock parameters, the influence of the parameters on the stability of the surrounding rock is analyzed by using the gray relational theory. Taking the sluice gate chamber of a power station on the Dadu River as an example, Modulus, shear modulus, internal friction angle and cohesion are the sensitive influence parameters. The point safety factor is determined as the evaluation index, and the sensitivity analysis of the factors affecting the safety factor of the typical cross-section point of the cavern after excavation is completed. The results show that the influence degree of surrounding rock parameters on the safety factor of characteristic points of tunnel section after excavation is in order of internal friction angle, cohesion, shear modulus and bulk modulus.