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针对国内新近出现的低跨比双洞八车道,依托相关实际工程,进行了室内模型试验和必要的数值模拟分析。主要研究了该类隧道近接时衬砌内力,洞周位移,接触压力随净距(净距分别为0.15D、0.3D、0.4D、0.6D、0.7D、0.9D、1D、1.2D)的变化规律,并且结合FLAC3D进行数值模拟计算,与试验得到的各测点受力大小进行对比,阐述了规律形成的原因。分析了隧道净距改变对低高跨比双洞八车道衬砌结构和围岩的破坏特征影响,得到各测点内力、位移随净距变化的相关结论。
Aiming at the recent low-span / double-lane eight lanes in China and relying on relevant practical projects, the indoor model tests and the necessary numerical simulation are conducted. The changes of internal force, displacement of perimeter and contact pressure with the clear distance (clearance of 0.15D, 0.3D, 0.4D, 0.6D, 0.7D, 0.9D, 1D, 1.2D) And the numerical simulation with FLAC3D was carried out to compare with the force of each test point obtained from the test, and the reasons for the formation of regularity were expounded. The influence of the change of the clear distance of the tunnel on the failure characteristics of the low-high-span and double-lane double-lane eight-lane lining structure and the surrounding rock is analyzed, and the correlativity between the internal force and the displacement of each measuring point is obtained.