Modifications to the GSI for granite in drilling
Modifications to the GSI for granite in drilling
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DOI：
10.1007/s10064-014-0581-0
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发表时间：
2014-03
影响因子：
4.2
通讯作者：
D. Lin;Yan Sun;Wei Zhang-;R. Yuan;Wantong He;B. Wang;Y. Shang
中科院分区：
文献类型：
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作者：
D. Lin;Yan Sun;Wei Zhang-;R. Yuan;Wantong He;B. Wang;Y. Shang
地质强度指数(GSI)被广泛应用于岩体力学参数的估计，但由于缺乏定量参数，对GSI的估计相对主观。因此，现有的估算GSI的方法不适用于钻井岩心的岩石样品。受复理石GSI估算方法(Marinos和Hoke，2000年墨尔本国际岩土工程地质工程会议论文集，技术出版社，兰开斯特，第1422-1446页)的启发，本文提出了两个参数，岩石矿物条件和岩芯长度，用于改进的、更定量的GSI估算方法。这种改进后的方法可用于钻取岩心中的花岗岩样品。它使用的是典型岩心样品的图像，而不是Hoek的GSI估计法给出的示意图。在此基础上，提出了一种适用于岩石力学参数估算的花岗岩GSI修正图版。将改进后的方法得到的弹性模量值和极限承载力值与实验数据进行了比较，结果表明，改进后的方法可以得到合理的GSI值，可以用来从钻探岩心中估算岩体的力学参数。
The Geological Strength Index (GSI) is widely used to estimate mechanical parameters of rock mass, but estimation of GSI is relatively subjective because of the lack of quantitative parameters. Hence, the existing method for estimating GSI is not suitable for rock samples from drilled cores. Inspired by the GSI estimation method of flysch (Marinos and Hoke, Proceedings of the GeoEng2000 at the international conference on geotechnical and geological engineering, Melbourne, Technomic publishers, Lancaster, pp 1422–1446, 2000), this paper proposes two parameters, the rock mineral condition and rock core length, for use in a modified, more quantitative method for estimating GSI. This modified method can be used for granite specimens from drilled cores. It uses images of typical core samples instead of the sketches given by Hoek’s GSI estimation method. A modified chart of GSI for granite, which is suitable for estimating mechanical parameters of rock mass from drilled core samples, is then developed. TheE(elastic modulus) andQult(ultimate bearing capacity) values obtained using our modified method were compared with those from experimental data; the results indicate that the modified method can produce reasonable GSI values and can be used to estimate the mechanical parameters of rock mass from drilled cores.