基于量化的地质强度指标在围岩力学参数评价中的应用

摘要

围岩力学参数是隧道工程围岩稳定性评价和进行数值计算的关键与难点,岩体地质强度指标(GSI)正是针对节理化围岩体提出的一种用于解决这一问题的分类体系.概述了基于量化的地质强度指标和Hoek-Brown经验破坏准则估算围岩力学参数的方法,在引入量化的扰动系数D及绝对风化指数AWI的基础上,对某公路隧道的围岩力学参数进行了评价.在缺乏原位试验与大量样本数据的情况下,该方法可较准确反映节理化围岩的力学特性,为类似工程提供参考.%The determination of the mechanical parameters of surrounding rock mass is a difficult and key issue in tunnel engineering stability evaluation and numerical calculation.The geological strength index (GSI) is just a classification system for solving this issue.The quantitative method of GSI and Hoek-Brown criterion that estimates the surrounding rock mechanical parameters is introduced.Based on quantitative disturbance index D and absolute weathering index AWl,the surrounding rock mechanical parameters of a highway tunnel are evaluated.Under the condition of lacking in situ-test and plenty of sample data,this simple and practical method can accurately reflect the mechanical properties of jointed surrounding rock mass and given for reference of similar projects.