深埋隧洞软岩力学特性与合理参数取值研究

doi:10.13722/j.cnki.jrme.2023.1028

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摘要针对深埋软岩力学特性与合理参数取值问题，通过室内高围压条件下的三轴试验，研究引江补汉工程志留系页岩的力学特性，分析不同层面倾角对页岩力学特性和破坏模式的影响，基于试验研究、理论分析、工程类比与反演、规范验证等多种手段的系统研究，提出一套深埋软岩合理力学参数取值方法，同时以地应力反演值的外包络线确定了软岩洞段不同埋深下的地应力大小，通过研究发现：随着围压由低变高，岩石试样的黏聚力随之增加，内摩擦角随之降低，当层面倾角为0°时，页岩试样的强度参数最高，当层面倾角为55°时，其强度最低，且此角度下的岩石破坏面与层面一致，基于三轴试验结果、H-B强度准则、同地层隧道工程类比和收敛约束法理论反演，总结出深埋软岩合理力学参数取值方法，体现了围压对岩体等效力学参数的影响，在此基础上，采用强度应力比和开挖变形量对引江补汉工程深埋软岩变形量、变形等级和规模进行预测和评价。

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	张茂础1
	2
	3
	颜天佑2
	3
	张国强2
	3
	李建贺2
	3
	武松2
	3

关键词 ：岩石力学, 深埋隧洞, 软岩, 力学特性, 力学参数, 变形等级

Abstract：In order to explore the mechanical properties and reasonable parameter values of deep buried soft rock，
the triaxial tests were conducted under high confining pressure conditions to study the mechanical properties of Silurian shale in the water diversion project from Three Gorges reservoir to Hanjiang river. Based on the experimental results，the influence of different dip angles on the mechanical properties and failure modes of shale was analyzed. Based on various methods such as experimental research，theoretical analysis，engineering analogy and inversion，and normative verification，a reasonable mechanical parameter values for deep buried soft rock is proposed. At the same time，the outer envelope of the inversion value of crustal stress was used to determine the crustal stress values for different burial depths in the soft rock cave section. Through research，it has been found that as the confining pressure increases from low to high，the cohesive force of rock samples continuously increases，and the internal friction angle continuously decreases. When the dip angle of the bedding plane is 0°，the strength of the shale sample is the highest. When the dip angle of the bedding plane is 55°，the strength is the lowest，and the rock failure surface at this angle is consistent with the bedding plane. Based on the results of triaxial compression tests，H-B strength criterion，analogy of tunnel engineering in the same stratum，and theoretical inversion using convergence constraint method，a reasonable mechanical parameter value method for deep buried soft rock is summarized，which can reflect the influence of confining pressure on the equivalent mechanical parameters of rock mass. Finally，the strength-to-stress ratio and excavation deformation were used to predict and evaluate the deformation level of deep buried soft rock in the water diversion project from Three Gorges reservoir to Hanjiang river.

Key words： rock mechanics deep-buried tunnel soft rock mechanical properties mechanical parameters deformation mechanism

引用本文:

张茂础1，2，3，颜天佑2，3，张国强2，3，李建贺2，3，武松2，3. 深埋隧洞软岩力学特性与合理参数取值研究[J]. 岩石力学与工程学报, 2024, 43(S1): 3217-3228.
ZHANG Maochu1，2，3，YAN Tianyou2，3，ZHANG Guoqiang2，3，LI Jianhe2，3，WU Song2，3. Research on mechanical properties and reasonable parameter values#br# of soft rock in deep buried tunnel. , 2024, 43(S1): 3217-3228.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.1028 或 http://rockmech.whrsm.ac.cn/CN/Y2024/V43/IS1/3217

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