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基于相似模拟理论,通过试验台架设计、监测系统设计、加载系统设计和岩体模型制作等流程,完成了双孔并行隧道模型试验系统的研制工作;试验中实时监控模型各关键位置的位移变化、应力变化及隧道岩壁破坏情况.研究表明,试验观测结果与基于Mohr-Coulomb模型所得数值模拟结果相对误差较大,而基于Plastic-Hardening模型进行数值模拟计算时,所得岩土体屈服状态和变化规律与相似模型试验结果吻合度较高.综合各方面分析研究结果,认为Plastic-Hardening模型能够更为精确合理的反映实际工程及试验中岩土体状态的真实变化情况,可为相似地质条件下的双孔并行隧道施工及维护提供重要参考.
Based on the similar simulation theory, this paper completed the development of two-hole parallel tunnel model test system through the design of test bench, the design of monitoring system, the design of loading system and the production of rock mass model. In the experiment, the displacement of each model at the key position was monitored in real time , Stress changes and the failure of tunnel walls.The results show that the relative error between the experimental observation and the numerical simulation based on the Mohr-Coulomb model is relatively large. However, when the numerical simulation is carried out based on the Plastic-Hardening model, The results show that the variation of the model is in good agreement with the results of similar models.According to the results of the analysis, the Plastic-Hardening model is more accurate and reasonable to reflect the actual changes of rock and soil status in actual engineering and experiment, Under the double hole parallel tunnel construction and maintenance provide an important reference.