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综合考虑巷道破坏特征及典型软岩应力应变曲线特征,对深部巷道松软围岩进行破坏分区,提出了适合破坏分区的四线段本构模型,建立了深部大规模松软围岩巷道应力分析的力学模型,推导了不同破坏分区应力解,得出了界定各破坏分区范围的表达式,结合具体工程验证了巷道破坏分区划分的正确性和合理性.研究表明:深部松软巷道围岩自巷道向外分别为塑性流动区、应变软化区、塑性硬化区和弹性区4个分区,各分区临界应力满足Mohr-Coulomb准则;围岩塑性区的范围随支护阻力、应变硬化系数、应变软化系数以及内摩擦角的增大而减小,随扩容系数的增大而增大;各分区范围的理论解能够有效指导支护设计,实现对深部大规模松软围岩巷道的长期稳定.
Considering the characteristics of roadway destruction and the characteristics of stress and strain curve of typical soft rock, the subdivision of the soft surrounding rock in deep roadway is carried out, and the four-line constitutive model suitable for failure zone is proposed. The mechanical model of stress analysis in deep large-scale soft surrounding rock is established. , And deduced the stress solution of different damage zoning, obtained the expression of defining the range of each damage zoning, and verified the correctness and rationality of zoning division with the specific project.The study shows that: The plastic flow zone, the strain softening zone, the plastic hardening zone and the elastic zone are divided into four zones, and the critical stress of each zone meets the Mohr-Coulomb criterion. The range of the plastic zone of the surrounding rock varies with the support resistance, the strain hardening coefficient, the strain softening coefficient and the internal friction The angle increases with the expansion coefficient and increases. The theoretical solution of the range of each sub-area can effectively guide the support design to achieve the long-term stability of the large-scale soft surrounding rock roadway.