基于GSI系统的岩体变形模量取值及应用

 在分析岩体的变形特性时，岩体变形模量是一个非常重要的参数，一般要通过现场试验来确定。但利用现场试验直接确定岩体变形模量时，具有时间长、代价高以及试验结果可靠性差等缺点。E. Hoek利用地质强度指标GSI，通过大量现场试验数据的分析研究，建立一种新的估算岩体变形模量的公式。分析这种最新计算岩体变形模量的方法，并通过对岩体结构特征和结构面表面特征的定量描述，对GSI系统进行量化取值，特别对岩体体积节理数Jv的取值进行深入分析。最后通过实际工程的运用，研究应用这一方法的具体过程。最后通过与现场试验结果进行对比，分析这一方法的合理性。

DETERMINATION AND APPLICATION OF MODULUS OF DEFORMATION OF ROCK MASSES BASED ON GSI SYSTEM

The deformation modulus of rock mass is an important input parameter in analyzing deformation，which should be determined by field tests. However，field tests are time consuming，expensive and the reliability is sometimes questionable. Based on data from in-situ measurements，E. Hoek proposed a new empirical formula for estimating values of deformation modulus of rock mass based on geological strength index(GSI). In order to provide more quantitative basis for evaluating GSI values，quantitative GSI system has been proposed by introducing measurable parameters with ratings or intervals which define structure and surface conditions of discontinuities. Especially，the methods to determine the parameter volumetric joint count(Jv) are studied in detail Finally，the proposed methods have been applied to practical projects and its rationality is further verified by comparing with field tests results.