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以Hoek-Brown弹塑性模型及应变软化模型为基础,采用FLAC3D数值模拟软件,构建三维数值模型,计算深埋隧道不同开挖方式下的围岩特征曲线,并对隧道围岩及支护结构稳定性进行评价。研究结果表明:采用Hoek-Brown弹塑性模型计算所得的隧道围岩安全系数要低于应变软化模型所计算得到的安全系数,表明采用弹塑性模型进行支护结构设计时,支护结构安全性较低,设计中可能会导致支护材料费用的增加,而考虑应变软化条件下的围岩安全系数更加接近工程实际;采用不同开挖形式所获得的隧道围岩安全系数并不相同,采用全断面法开挖所获得的安全系数要明显低于七步开挖法,采用收敛约束法计算隧道围岩稳定性更加直观。
Based on the Hoek-Brown elastic-plastic model and strain softening model, FLAC3D numerical simulation software is used to construct the three-dimensional numerical model to calculate the surrounding rock characteristic curve under different excavation methods of deep tunnel and to stabilize the surrounding rock and supporting structure of the tunnel Sexual evaluation. The results show that the safety coefficient of the surrounding rock calculated by the Hoek-Brown elastic-plastic model is lower than that of the strain softening model, which indicates that the safety of the supporting structure is better than that of the elasto-plastic model when the supporting structure is designed Low, the design may lead to an increase in the cost of supporting materials, while considering the strain softening conditions of the surrounding rock safety factor closer to the actual project; tunnel excavation obtained by different safety factor is not the same, the use of full-face The safety factor obtained by the method of excavation is obviously lower than that of the seven-step excavation method, and the stability of the surrounding rock of tunnel is more intuitively calculated by the method of convergence and restraint.