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王可意,余同日,张晓雄,高颖.GSI值定量化与岩体力学参数的确定[J].河北工程大学自然版,2022,39(1):46-51
GSI值定量化与岩体力学参数的确定
Quantification of GSI Value and Determination of Rock Mechanics Parameters
投稿时间:2021-09-17  
DOI:10.3969/j.issn.1673-9469.2022.01.007
中文关键词:  Hoek-Brown强度准则  地质强度指标GSI  正交试验  岩体力学参数
英文关键词:Hoek-Brown strength criterion  geological intensity index GSI  orthogonal test  mechanical parameters of rock mass
基金项目:国家自然科学基金资助项目(51708317);河北省高等学校科学技术研究项目(QN2019108)
作者单位
王可意 河北工程大学 土木工程学院, 河北 邯郸 056038 
余同日 河北工程大学 土木工程学院, 河北 邯郸 056038 
张晓雄 河北工程大学 土木工程学院, 河北 邯郸 056038 
高颖 河北工程大学 土木工程学院, 河北 邯郸 056038 
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中文摘要:
      为了降低地质强度指标GSI取值主观性,提高岩体力学参数取值精度,采用正交试验得出岩体地质特征参数关于GSI敏感性排序,选出对GSI影响较大的4个参数;引入岩体结构等级SR、结构面表面等级SCR的区间数概化出GSI区间范围;引入岩体完整性系数KV,波速比K'V对GSI区间范围进行线性插值,从而获得精确的GSI值。以清家沟隧道为例,用该方法估算出的岩体力学参数值在III2级围岩规范范围内,利用FLAC3D进行数值模拟,所得拱顶竖向沉降值与实际监测值之间相对误差为1.5%,验证了该方法的可靠性。
英文摘要:
      Reducing the subjectivity of geological strength index GSI value and improving the accuracy of rock mechanics parameter value are crucial for surrounding rock stability. The sensitivity ranking of rock mass geological characteristic parameter’s to GSI was obtained by orthogonal test, and four parameters that had great influence on GSI were selected. The interval range of GSI was generalized by introducing the interval number of rock mass structural grade SR and structural plane surface SCR. The rock integrity coefficient KVand wave velocity ratio K’V were introduced to perform linear interpolation for GSI interval range, so as to obtain accurate GSI value. Taking Qingjiagou tunnel as an example, the rock mass mechanical parameters estimated by this method were within the Ⅲ2standard for surrounding rock. FLAC3D was used to establish the tunnel excavation model.The relative error between the calculated vertical settlement value and the actual monitoring value was 1.5%, which verifies the reliability of this method.
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