【摘 要】
：
温度场与应力场是影响碳质千枚岩地层引水隧洞围岩强度的重要因素.设定2因素4水平16组试验,依据单轴与三轴试验结果,探讨热力耦合作用下碳质千枚岩应力?应变曲线性态与破坏模式,得到了峰值强度变化规律;基于Mohr–Coulomb强度准则(M–C)与Heok–Brown强度准则(H–B),分别建立了热力耦合作用下Mohr–Coulomb–Thermal法(M–C–T)和Heok–Brown–Thermal法(H–B–T)两种破坏强度计算方法.试验结果与理论分析表明,随围压增大与温度升高,碳质千枚岩从脆性破坏逐渐
【机 构】
：
中铁十四局集团第五工程有限公司,山东兖州 272100
论文部分内容阅读
温度场与应力场是影响碳质千枚岩地层引水隧洞围岩强度的重要因素.设定2因素4水平16组试验,依据单轴与三轴试验结果,探讨热力耦合作用下碳质千枚岩应力?应变曲线性态与破坏模式,得到了峰值强度变化规律;基于Mohr–Coulomb强度准则(M–C)与Heok–Brown强度准则(H–B),分别建立了热力耦合作用下Mohr–Coulomb–Thermal法(M–C–T)和Heok–Brown–Thermal法(H–B–T)两种破坏强度计算方法.试验结果与理论分析表明,随围压增大与温度升高,碳质千枚岩从脆性破坏逐渐转为延性破坏,黏聚力、单轴抗压强度和参数n随温度升高呈线性增大,内摩擦角受温度影响不显著.通过试验值与计算对比分析,M–C–T法和H–B–T法均能较好地量化热力耦合作用下碳质千枚岩强度演化规律;误差分析表明,前者计算误差为 ?28.5％～7.7％,后者为 ?8.9％～5.6％,H–B–T法计算结果离散程度较小,稳定性更高,且更偏向于安全.
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