小净距隧道穿越岩堆体综合加固方案效果分析  

Effect Analysis of Comprehensive Reinforcement Scheme for Small-distance Tunnel Passing through Rock Pile

作　　者：厉工厂 倪超超 谭飞 汤瑞 张少国 张羽 LI Gong-chang;NIChao-chao;TAN Fei;TANG Rui;ZHANG Shao-guo;ZHANG Yu(Anhui Construction Engineering Investment Group Co.Ltd.,Hefei 230031,China;Faculty of Engineering,China University of Geosciences,Wuhan 430074,China)

机构地区：[1]安徽建工建设投资集团有限公司,合肥市230031 [2]中国地质大学(武汉)工程学院,武汉市430074

出　　处：《公路》2024年第3期393-399,共7页Highway

基　　金：国家自然科学基金项目,项目编号42277165,41920104007。

摘　　要：山区隧道穿越岩堆体时,开挖扰动易导致上覆岩堆体产生局部或整体性的失稳破坏,引起工程地质灾害。以某穿越岩堆体的小净距隧道为工程背景,采用FLAC 3D软件进行数值仿真计算,对无加固措施、仅在上覆岩堆体注浆加固和岩堆体注浆结合锚索支护双重加固等3种工况进行模拟计算,对比分析了岩堆体表面变形、隧道内拱顶沉降以及隧道上覆围岩沉降变形趋势,评估不同加固方案的实施效果。结果表明:地层注浆对控制隧道内的拱顶沉降具有较好的效果;锚索支护结合地层注浆综合加固方案可有效抑制岩堆体在隧道开挖扰动下的变形,有助于提升岩堆体的稳定性。综合加固方案可以较好地解决小净距隧道穿越岩堆体诱发的工程问题,可为类似工程提供一定的参考。When the tunnel passes through the rock pile in mountain area,the excavation disturbance is easy to cause the local or whole instability failure of the overlying rock pile,which leads to the engineering geological disaster.In this paper,a tunnel with a small clean distance through a rock pile is taken as the engineering background.FLAC-3D numerical software is used to carry out numerical simulation calculation.The simulation calculation is carried out on three conditions:no reinforcement measures for the tunnel surrounding rock,only grouting reinforcement above the tunnel,and anchor cable reinforcement of the exit section slope combined with grouting reinforcement above the tunnel.The surface deformation of the rock pile,the settlement of the arch in the tunnel and the settlement deformation trend of the surrounding rock over the tunnel are compared and analyzed,and the implementation effects of different reinforcement schemes are evaluated.The results show that the integrated reinforcement scheme of anchor cable support combined with stratum grouting can effectively restrain the deformation of rock pile under the disturbance of tunnel excavation,and help to improve the stability of rock pile.The deformation of rock pile is relatively small,and the whole rock pile is in a safe state.Stratum grouting has a good effect on controlling the settlement of vault in tunnel.The comprehensive reinforcement scheme can better solve the engineering problems caused by the small clear distance tunnel passing through the rock pile,and can provide a certain reference for similar projects.

关 键 词：小净距隧道 岩堆体 数值模拟 注浆加固 锚索加固 围岩稳定性 

分 类 号：U455.49[建筑科学—桥梁与隧道工程]