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基于地质强度指标GSI体系和Hoek-Brown强度准则,研究岩体强度及变形模量时没有考虑到结构面产状对工程岩体参数的影响.结合三峡工程地下厂房,根据围岩开挖面与结构面分布的空间位置关系,确定了结构面分布对围岩结构等级SR的影响系数,改进了GSI体系中围岩SR的统计方法,确定了围岩的等效变形模量和强度参数.研究表明,改进后的GSI体系求解的围岩弹性区等效弹性模量、扰动区等效变形模量和粘聚力分别减小了约15%、8%和28%的误差.
Based on the GSI system and the Hoek-Brown strength criterion, the rock mass strength and deformation modulus are not taken into account when considering the influence of structural surface yield on the parameters of engineering rock mass. Combined with the underground powerhouse of the Three Gorges Project, The relationship between the spatial distribution of structure plane and the SR of surrounding rock structure was determined, the statistical method of surrounding rock SR in GSI system was improved, and the equivalent deformation modulus and strength parameters of surrounding rock were determined. The results show that the equivalent elastic modulus of the elastic zone and the equivalent deformation modulus and cohesive force of the perturbed zone are reduced by about 15%, 8% and 28% respectively in the improved GSI system.