Sensitivity Analysis in the Estimation of Mechanical Parameters of Engineering Rock Mass Based on the Hoek–Brown Criterion
Sensitivity Analysis in the Estimation of Mechanical Parameters of Engineering Rock Mass Based on the Hoek–Brown Criterion
复制标题
基于Hoek-Brown准则的工程岩体力学参数估算的敏感性分析
DOI：
10.1155/2020/9418905
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发表时间：
2020-08
影响因子：
--
通讯作者：
Changgen Yan
中科院分区：
文献类型：
--
作者：
Zhiqiang Li;Guofeng Liu;Shuqian Duan;Shufeng Pei;Changgen Yan
完整岩石的地质强度指数GSI、扰动因子(D)、材料常数mi 和单轴抗压强度σci 是Hoek–BrownH−B 准则的基本输入参数IPs。 H-B准则估算的工程岩体力学参数MPs，包括弹性模量E、粘聚力c和内摩擦角φ，以及基于MPs预测的围岩开挖响应，包括位移和开挖损伤区EDZ，与H-B准则的四个IP具有高度相关性。本文以我国西南地区在建水电站玄武岩开挖的深大地下洞室为研究对象，分析了IPs对围岩体MPs、位移和EDZ的敏感性。首先，采用H-B准则来估计MP，其中IP是通过一系列现场和实验室测试获得的，包括钻孔摄像机观察、波速测试、单轴和三轴压缩测试等。其次，建立IP、MP与位移和EDZ预测结果之间的敏感性关系，并通过敏感性因子（si）进行定量描述。结果表明，岩体MPs对GSI较为敏感，D⋅GSI和σcia是影响位移和EDZ的高灵敏度参数。最后，进一步量化了由于 IP 确定的不确定性而导致的估计 MP 和与开挖响应相关的预测结果的变化。这项研究为 H-B 准则估计的岩体参数的变异性提供了直接的评估。也为类似岩土工程初步设计中岩体参数的确定提供了有价值的参考。
Geological strength indexGSI, disturbance factor (D), material constantmi, and uniaxial compressive strengthσciof the intact rock are essential input parametersIPsof the Hoek–BrownH−Bcriterion. Mechanical parametersMPsof the engineering rock mass, including elastic modulusE, cohesionc, and internal friction angleφestimated by the H–B criterion, and the predicted excavation response of surrounding rock, including the displacement and excavation damage zoneEDZbased on the MPs, are of high relevance with the four IPs of the H–B criterion. In this paper, the deep and huge underground cavern excavated in basalt from a hydropower station under construction in the southwest of China is used to analyse the sensitivity of the IPs on the MPs, the displacement, and EDZ of the surrounding rock mass. Firstly, the H–B criterion is applied to estimate the MPs, among which the IPs are obtained from a series ofin situand laboratory tests, including borehole camera observation, wave velocity test, uniaxial and triaxial compression tests, and so on. Secondly, the sensitivity relationships between IPs, MPs, and prediction results of displacement and EDZ are established and described quantitatively by the sensitivity factor (si). Results show that the MPs of the rock mass are more sensitive toGSIandD⋅GSIandσciare high-sensitivity parameters affecting the displacement and EDZ. Finally, the variations in the estimated MPs and associated prediction results concerning excavation response, which are caused by the uncertainties in the determination of the IPs, are further quantified. This study provides a straightforward assessment for the variability of the rock mass parameters estimated by the H–B criterion. It also gives a valuable reference to similar geotechnical engineering for the determination of rock mass parameters in the preliminary design.
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DOI：
10.1016/0886-7798(94)90045-0
发表时间：
1988-04
期刊：
--
影响因子：
--
作者：
J. Dunnicliff
通讯作者：
J. Dunnicliff
影响因子：
5.8
作者：
E. Hoek
通讯作者：
E. Hoek
影响因子：
6.2
作者：
Cai, M.
通讯作者：
Cai, M.
影响因子：
7.4
作者：
Liu, Guofeng;Feng, Xia-Ting;Li, Shaojun
通讯作者：
Li, Shaojun
DOI：
--
发表时间：
2009
期刊：
Chinese journal of rock mechanics and engineering
影响因子：
--
作者：
S. Chong
通讯作者：
S. Chong