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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第13卷    第11期    总第80期    2016年11月

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文章编号:1672-7029(2016)11-2168-06
定量化GSI在估计岩体力学参数中的应用研究
王可意,徐东强

(河北工业大学 土木工程学院,天津 300401)

摘 要: Hoek-Brown强度准则在裂隙化岩体中得到了广泛应用。然而,Hoek给出的岩体结构特征和岩体表面状况与地质强度指标 (GSI)的概化关系,公路隧道工程中无法根据勘察报告给出围岩指标,建立与GSI的对应关系。鉴于此,必须建立岩体完整系数(Kv)和岩体风化程度系数(Kf)与GSI的定量关系,从而确定Hoek-Brown强度准则中所需要的岩体参数值。利用该方法估计公路隧道围岩的力学参数,将该估算值用于模拟隧道拱顶沉降,得到的模拟值与实际监测结果对比,误差在允许范围之内。通过算例验证该方法确定H-B强度准则中岩体参数的可行性,为公路隧道不同围岩的H-B强度准则岩体参数值的确定提供了新的快速、实用的方法。

 

关键字: 岩石力学;地质强度指标( GSI);完整性系数(Kv);风化系数(Kf);围岩分级

Application of quantitative GSI in the estimation of rock mechanics parameters
WANG Keyi,XU Dongqiang

Civil Engineering inHebei University of Technology, Tianjin 300401, China

Abstract:Hoek-Brown strength criteria is widely applied in fissure rock-mass, although the qualitative relationship among rock structure characteristics, rock surface condition and Geological Strength Index (GSI) has been offered by E.Hoek, surrounding rock index cannot be provided according to survey report in highway tunnel engineering along with failure to connect with GSI. Therefore, the quantitative relationship among rock complete coefficient (Kv), rock weathering coefficient (Kf) and Geological Strength Index (GSI) was established in order to determine the rock parameters in Hoek-Brown strength criteria. By using this method, the estimates of the surrounding rock mechanical parameters were located within standard ranges. When estimates were applied to simulate the vault settlement of tunnel, the obtained error between simulated and monitored results was within the allowable range. Application of this method validated the feasibility of determining the rock parameters of Hoek-Brown strength criteria, which provides a new practical way to determinate rock mass mechanical parameters of H-B strength criteria for surrounding rock in highway tunnel.

 

Key words: rock mechanics; geological strength index (GSI); rock complete coefficient (Kv); rock weathering coefficient (Kf); surrounding rock classification

ISSN 1672-7029
CN 43-1423/U

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