基于数值分析与现场试验的破碎带支护参数优化

发布时间：2019-07-15 09:34

【摘要】：为了控制围岩的变形,确保施工的安全,结合船顶隘隧道在穿越断层破碎带时出现的变形过大,局部出现塌方的现象,提出了减小钢拱架间距增加初支强度的支护方案,并选取了两组方案进行对比分析研究。先通过数值模拟对钢拱架和锚杆分别进行了计算,然后在现场监测试验中,选取了两组试验段,对两种不同的支护参数下的围岩变形、喷射混凝土压力、钢拱架应力以及初支围岩压力进行现场监控量测,验证了支护优化的可行性。研究表明:在断层破碎带初支参数优化中,锚杆支护效果不理想,而钢拱架的作用明显,对围岩大变形起到了良好的控制作用。由此可知通过加密钢拱架来增加初支强度,适当弱化锚杆来减少工序,降低成本的支护优化措施在隧道穿越断层破碎带中是可行的。
[Abstract]:In order to control the deformation of surrounding rock and ensure the safety of construction, combined with the phenomenon of excessive deformation and local collapse of ship top pass tunnel passing through fault fracture zone, a support scheme to reduce the spacing of steel arch frame and increase the strength of initial support is put forward, and two groups of schemes are selected for comparative analysis and study. Firstly, the steel arch frame and bolt are calculated by numerical simulation, and then two groups of test sections are selected in the field monitoring test to monitor and measure the deformation of surrounding rock, shotcrete pressure, steel arch frame stress and initial support surrounding rock pressure under two different supporting parameters, and the feasibility of support optimization is verified. The results show that the bolt support effect is not ideal in the optimization of the initial support parameters of the fault fracture zone, but the effect of the steel arch frame is obvious, which plays a good role in controlling the large deformation of the surrounding rock. Therefore, it can be seen that the support optimization measures to increase the initial support strength, weaken the bolt properly to reduce the working procedure and reduce the cost are feasible in the tunnel passing through the fault fracture zone by encrypting the steel arch frame.
【作者单位】：江西省交通科学研究院;重庆交通大学河海学院;
【基金】：江西省交通科技重点项目(2015C0015;2015C0016;2015C0019)
【分类号】：U455.7

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