APPLICATION OF ROCK STRAIN SOFTENING MODEL TO NUMERICAL ANALYSIS OF DEEP TUNNEL
APPLICATION OF ROCK STRAIN SOFTENING MODEL TO NUMERICAL ANALYSIS OF DEEP TUNNEL
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发表时间：
2009
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通讯作者：
S. Chong
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作者：
S. Chong
沿着深埋地下洞室群的建设，深埋地下洞室群的开挖稳定性问题成为研究的热点，针对深埋隧道围岩的特殊力学行为，采用应变软化模型进行数值分析更为合适。并通过一个简单的岩石数值加载算例，分析了Mohr-Coulomb弹塑性模型和应变软化模型的应力应变计算结果。并对Mohr-Coulomb弹塑性模型和应变软化模型的计算结果进行了对比分析，主要对围岩变形、塑性区和安全系数进行了分析。结果表明，主、连接洞两侧变形较大，危险性较大，应考虑主、连接洞两侧的支护。
Along with the construction of underground caverns in depths,the stability of deep underground cavern excavation is a hot issue.According to the special mechanical behaviors of rock in deep tunnelt,he strain-softening model is more suitable for numerical analysis.First,the mechanical properties of surrounding rock in deep tunnel and rock strain-softening model are simply analyzed;and through a simple numerical loading example of rock,the stress-strain computation results of Mohr-Coulomb elastoplastic model and strain-softening model are analyzed.Then,a simple circle deep tunnel numerical analysis is carried out;and the comparative analysis of computation results of Mohr-Coulomb elastoplastic model and strain-softening are analyzed;mainly for the analysis of the surrounding deformation,plastic zone and factor of safety.Finally,the strain-softening model is used to the deep underground caverns of Liangjiaren Hydropower Station;and the stability of underground caverns is evaluated.The results show that the deformations of both sides of main cavern and the junction cavern are larger,more dangerous than other places.The support of the both sides of main cavern and junction cavern should be considered.