GSI与断裂韧度K之间的关系研究

STUDY ON THE RELATION OF GSI AND FRACTURE TOUGHNESS K

岩体开挖卸荷,将会在岩体中产生卸荷损伤,因此如何通过宏观参数或者通过实验室的微观断裂韧度实验,来确定卸荷损伤的宏、微观参数之间的关系,目前研究的较少见。通过严密的公式推导,研究了宏观地质强度参数与岩石的断裂韧度K之间的关系,并通过某现场实例进行了验证。研究结果表明:本文所推导得到的公式与实验吻合良好,具有一定的实用价值。

At present, the relation of the macroscopical and microcosmic parameters through the macroscopical parameter or the microcosmic fracture toughness test has seldom been found. The damage will initialize in the rock mass during unload because of the cutting; and it is difficulty to define the relation from the laboratory test and another parameters. However, there is a relation between the macroscopical and microcosmic parameter. A series of equations are proposed for the relation about the geological strength index (GSI) and the fracture toughness K. It is found that the results achieved from the equations agree well with those of in-situ test and laboratory rest.