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利用研制成功的公路隧道结构与围岩综合实验系统 (CTSSSRH) ,以渝黔高速公路重庆段真武山隧道为例 ,对大跨度扁坦隧道的开挖过程进行了 1∶ 36的大比例尺相似模型实验 ,并建立了相似模型四分部开挖方法及全断面法、上下台阶法、左右分部法的三维力学模型 ,用 3D-σ程序分别对其动态施工过程进行了数值分析。同一开挖方法同一施工阶段相应测点的围岩位移对比表明 ,相似模型实验与数值分析结果较为吻合
Taking the Zhenwu Mountain Tunnel in Chongqing section of Chongqing-Guizhou Expressway as an example, a large scale similar model of 1:36 for the excavation of long-span tunnel is constructed by using the developed tunnel structure and surrounding rock comprehensive experiment system (CTSSSRH) The 3D excavation method and the three-dimensional mechanics model of four-part excavation of similar model, full-face method, up-and-down step method and left-right parting method were established. The 3D-σ program was used to analyze the dynamic construction process. The comparison of surrounding rock displacements at the corresponding measuring points in the same excavation method in the same excavation method shows that the results of similar model experiments and numerical analyzes are in good agreement