基于矿物结构与钻探的花岗岩地质强度指标研究及应用  

STUDY OF GEOLOGICAL STRENGTH INDEX FOR GRANITE BASED ON MINERAL STRUCTURE AND DRILLING AND ITS APPLICATION

作　　者：林达明[1,2] 尚彦军[1] 吴锋波[1,2] 张巍[1,2] 张翔[3] 

机构地区：[1]中国科学院地质与地球物理研究所中国科学院工程地质力学重点实验室,北京100029 [2]中国科学院研究生院,北京100049 [3]中国科学院高能物理研究所东莞中子科学中心,广东东莞523780

出　　处：《岩石力学与工程学报》2011年第4期761-768,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家重点基础研究发展规划(973)项目(2010CB732001);国家自然科学基金资助项目(40972198)

摘　　要：受Hoek对泥砂岩地质强度指标(GSI)图研究的启发,在野外工作和室内试验的基础上,尝试建立一个基于矿物结构与钻探的花岗岩GSI量化取值图:(1)该图引进岩石矿物结构、完整岩芯长度、节理条件等参数来对GSI取值进行量化;(2)用典型完整岩芯照片代替GSI取值图里岩体结构的素描图,并结合野外岩芯RQD、采芯率、岩体结构等特征对该照片进行描述。根据Hoek-Brown准则,利用该GSI图计算出花岗岩的弹性模量E,其与勘察单位给出的E值最小误差为0.11 GPa,说明该图具有一定的科学性,可用于钻探的场地花岗岩体力学参数估算。Inspired by the flysch which was given by Hoek in RocLab software and based on the field work and lab experiment,a quantitative diagram of the geological strength index（GSI） for granite based on mineral structure and drilling is established;of which the process is as follows：（1） Mineral structure,rock core length and joint condition of rock are introduced in this diagram to help the quantitative study of GSI.（2） Try to use the typical picture of field core to substitute the sketch drawing given by Hoek.Combining with characteristics such as rock quality designation of core,core recovery ratio and rock structure and so on,the pictures are described.According to Hoek-Brown formula,elastic modulus E of granite is calculated by the proposed diagram of GSI.Comparison between the calculated result and that given by the exploration firm is conducted;it is also shown that the results fit each other very well and the minimum error of E between them is 0.11 GPa.Therefore,the new GSI diagram is scientific and it can be widely used in drilling engineering to estimate the parameters of granite.

关 键 词：岩石力学 地质强度指标 岩石矿物结构 花岗岩 钻探 

分 类 号：TU45[建筑科学—岩土工程]