基于纵波波速的块状岩体GSI系统

为减少目前GSI系统对现场地质观察的依赖程度,降低其应用难度,且使其能更加准确地反映一定深度范围内的岩体特性,根据现有研究成果与GSI系统输入参数的定性、定量对应关系,建立基于纵波波速的GSI系统,据此获得大岗山坝区岩体的GSI,通过对比分析此结果与经验公式的结果及基于GSI的岩体变形模量的预测值与实测值的分布规律及其相关性,探讨了将岩体完整系数和岩石风化程度系数作为GSI系统输入参数的可行性。结果表明:基于岩体完整系数和岩石风化程度系数的GSI系统基本可行;风化程度输入参数采用风化岩石与未风化岩石的波速比平方较为合理;岩体完整系数和岩石风化程度系数丰富了GSI系统的输入参数。

GSI system for rock blocks based on longitudinal wave velocity

In order to reduce the dependence of GSI system on the field geological observation，to reduce the difficulty of its application and to reflect more accurately the characterization of rock mass from the surface to a certain depth，a new GSI system in terms of the longitudinal wave velocity was built based on the correspondence of intactness and weathering between the results existing research and GSI systems. The geological strength indexes of rock mass from the region of Dagangshan dam were obtained from the new system. Its feasibility was confirmed through the analysis of the distributions and correlation between the results obtained from the new GSI system and empirical formula，and between the predicted deformation modulus of rock with GSI and the measured one. The squared ratio of the weathered rock to unweathered rock is a reasonable input parameter which represents the weathering degree. The input parameters of GSI system can be replaced with the intactness index and weathering index of rock.