(1. Changjiang Design Group Co.，Ltd.，Wuhan，Hubei 430010，China；2. Changjiang Survey，Planning，Design and Research Co.，Ltd.，Wuhan，Hubei 430010，China；3. Key Laboratory of Water Grid Project and Regulation of Ministry of Water Resources，Changjiang Design Group Co.，Ltd.，Wuhan，Hubei 430010，China)
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.
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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2024, Vol. 43 
