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以重庆市轨道交通三号线为工程背景,开展十字岩柱暗挖法地质力学模型试验研究,优化大断面隧道开挖工序,进行围岩岩土相似材料配比试验、模拟洞室开挖过程中锚固注浆加固作用、洞室开挖过程的围岩位移变形监测分析。试验结果表明:研制的钢结构台架可成功模拟加围压条件下的洞室开挖,可直观地观察到模型开挖时围岩的渐进破坏过程。模型试验采用的监测系统能对开挖过程中洞室围岩的位移进行实时监测,实现了开挖支护与监测记录同步进行。根据相关参数建立数值分析模型,将数值计算结果与试验实测结果进行对比分析可知:二者结果基本一致,规律大致相同,且最终位移值满足试验要求,表明模型试验取得了较为理想的效果。研究工作对实际工程施工及今后类似模型试验研究的发展具有一定指导作用。
Taking the Chongqing Metro Line 3 as the engineering background, the geomechanical model test of the cross-rock pillar undercut excavation method was carried out to optimize the excavation process of the large-section tunnel and to carry out the matching test of similar materials for surrounding rock and soil to simulate the excavation process In the anchor grouting reinforcement role, tunnel excavation process of surrounding rock displacement deformation monitoring analysis. The experimental results show that the developed steel structure bench can simulate the tunnel excavation under the condition of confining pressure and the gradual destruction process of surrounding rock can be observed visually. The monitoring system adopted in the model test can monitor the displacement of the surrounding rock in the tunnel during excavation in real time and realize the synchronization of excavation support and monitoring record. According to the related parameters, a numerical analysis model is established. Comparing the numerical results with the experimental results, we can see that the two results are basically the same, the laws are roughly the same, and the final displacement values meet the test requirements, which shows that the model test has achieved satisfactory results. Research work on the actual construction of the project and the future development of similar experimental model has a guiding role.