基于Hoek-Brown强度准则的软岩隧洞稳定性分析及应用

doi:10.13722/j.cnki.jrme.2023.0331

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摘要为解决复杂地质赋存条件下隧洞施工阶段的稳定性分析问题，基于Hoek-Brown强度准则，根据弹塑性理论得出侧压力系数为1.0条件下，圆形隧洞的塑性区半径计算公式，并提出围岩塑性区发展系数。研究了围岩塑性区发展系数与隧洞埋深以及地质强度指标GSI之间的关系。以滇中引水工程楚雄段部分洞段为工程背景，使用点荷载实验仪确定该洞段泥质粉砂岩单轴抗压强度，结合抗拉强度确定Hoek-Brown关键参数之一—岩石材料常数，随后结合围岩纵向变形曲线、围岩特征曲线和支护特征曲线，对隧洞初期支护结构稳定性进行分析，并与Carranza归一化方法进行对比。研究结果表明，随着围岩质量的降低和埋深的增加，隧洞开挖后进入塑性状态的围岩范围也随之增大；使用该方法获得的围岩塑性范围大于Carranza归一化方法获得的围岩塑性区范围；对于该隧洞而言，现有初期支护结构的安全系数均大于1.0，可保持隧洞稳定，且使用该方法进行稳定性分析比使用Carranza归一化方法分析更加安全保守，这对于复杂地质条件下的软岩隧洞工程安全施工是有利的。

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	任子健1
	王涛2
	吴顺川1
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	耿晓杰1
	浦仕江1
	程海勇1

关键词 ：隧道工程, Hoek-Brown强度准则, 围岩塑性区, 点荷载实验, 收敛约束法

Abstract：To solve the stability analysis problem of the tunnel construction stage under complex geological occurrence conditions，based on the Hoek-Brown strength criterion，this paper obtains the calculation formula of the plastic zone radius of the circular tunnel under the condition of lateral pressure coefficient of 1.0. And the evolution coefficient of the surrounding rock plastic zone was proposed. The relationship between the evolution coefficient of the surrounding rock plastic zone and the buried depth of the tunnel and geological strength index GSI was studied. Taking part of the Chuxiong section of the Dianzhong Water Diversion Project as the engineering background，the uniaxial compressive strength of argillaceous siltstone in the cave section was obtained by a point load tester，and one of the key parameters of Hoek-Brown-rock material constant was determined by combination with tensile strength. Combined with the longitudinal deformation curve of the surrounding rock，the characteristic curve of the surrounding rock，and the support characteristic curve，the stability of the primary support structure of the Wuzhuangcun tunnel was analyzed，and compared with the Carranza normalization method. The results show that with the decrease in the quality of the surrounding rock and the increase of the buried depth，the range of surrounding rock that enters the plastic state after tunnel excavation also increases. The plastic zone range of surrounding rock obtained by this method is larger than that obtained by the Carranza normalization method. For this tunnel，the safety factor of the existing primary support structure is greater than 1.0，which can keep the tunnel stable，and the stability analysis using the proposed method is safer and more conservative than the normalization method using Carranza，which is beneficial for the safe construction of soft rock tunnel engineering under complex geological conditions.

Key words： tunnel engineering Hoek-Brown strength guidelines plastic zone of surrounding rock point load test convergence-confinement method

引用本文:

任子健1，王涛2，吴顺川1，3，耿晓杰1，浦仕江1，程海勇1. 基于Hoek-Brown强度准则的软岩隧洞稳定性分析及应用[J]. 岩石力学与工程学报, 2024, 43(S2): 3779-3791.
REN Zijian1，WANG Tao2，WU Shunchuan1，3，GENG Xiaojie1，PU Shijiang1，CHENG Haiyong1. Stability analysis and application of soft rock tunnel based on Hoek-Brown strength criterion. , 2024, 43(S2): 3779-3791.

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https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0331 或 https://rockmech.whrsm.ac.cn/CN/Y2024/V43/IS2/3779

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