工程爆破

2019, v.25;No.108(02) 19-25

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连拱隧道控制爆破施工技术及其数值模拟
Construction technology and numerical simulation of multi-arch tunnel controlled blasting

邹兴林;
ZOU Xing-lin;The Fourth Engineering Co.,Ltd.of CCCC First Highway Engineering Co.,Ltd.;

摘要(Abstract):

为了顺利完成百楼1#隧道与连接桂黔两省的红水河特大桥精确对接和控制隧道开挖工程的超欠挖现象,针对隧道穿越地层存在岩体较破碎、滑坡、不稳定斜坡、岩体裂隙较为发育,地形地貌变化较大的复杂情况,设计了1.2 m小尺寸中隔墙连拱隧道施工方案,但国家相关标准规定中墙厚度不宜小于1.4 m。采用Ansys workbench对隧道工况进行静力学分析,对比分析了厚度1.2 m与厚度1.4 m中墙的隧道变形及应力分布,分析结果:1.2、1.4 m中墙结构的变形分别为2.241 6、2.241 08 mm,位移变形部位集中在中墙顶部位置;厚度1.2、1.4 m中墙的隧道边墙结构点最大主应力分别为18.568、18.343 MPa。其结果说明了1.2 m中隔墙结构的变形及最大应力分布均在较为安全的范围内,1.2 m中墙厚度较为可行。采用Ansys ls-dyna对主洞光面爆破作业过程进行了数值模拟,分析了不同装药条件下的光面爆破效果,根据数值模拟结果,优化了爆破参数、装药结构,有效地控制了超、欠挖现象,达到了较好的爆破效果。利用连拱隧道静力学分析模型的模拟结果指导现场施工,确保隧道安全开挖,完成连拱隧道与红水河特大桥精确对接和满足安全运营要求的成功经验,可为同类工程提供参考。
In order to complete the accurate connection between Bailou No.1 tunnel and the Hongshuihe bridge connecting Guangxi and Guizhou provinces, and to control the over-excavation and under-excavation of the tunnel excavation project, there were complex conditions such as broken rock mass, landslide, unstable slope, well developed rock mass fracture and large change of topography and landform in the tunnel area,so a 1.2 m small-sized multi-arch tunnel with middle partition wall was designed. However, the thickness of the middle wall should not be less than 1.4 m according to the relevant national standards. So the Ansys workbench was used for static analysis of tunnel working conditions, and the tunnel deformation and stress distribution of the middle wall with a thickness of 1.2 m and 1.4 m were compared and analyzed. The results showed that the deformation of the wall structure with a thickness of 1.2 m and 1.4 m was 2.241 6 mm and 2.241 08 mm respectively, and the displacement and deformation were concentrated at the top of the middle wall. The maximum principal stress at the structure point of the tunnel side wall with the thickness of 1.2 m and 1.4 m were 18.568 MPa and 18.343 MPa. The results showed that the deformation and maximum stress distribution of the wall structure in 1.2 m are within a safe range, and the construction plan of the wall thickness in 1.2 m is feasible. Ansys ls-dyna was used to simulate the smooth blasting process of the main hole, and the smooth blasting effect under different charging conditions was analyzed. According to the numerical simulation results, the blasting parameter charging structure was optimized, and the overbreak and underbreak phenomenon was effectively controlled, and a good blasting effect was achieved. The simulation results of the multi-arch tunnel static analysis model are used to guide the site construction, to ensure the safe excavation of the tunnel, to complete the accurate connection between the multi-arch tunnel and the Hongshuihe bridge, and to meet the requirements of safe operation. It can provide reference for similar projects.

关键词(KeyWords): 连拱隧道;控制爆破;施工技术;数值模拟
multi-arch tunnel;controlled blasting;construction technology;numerical simulation

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作者(Author): 邹兴林;
ZOU Xing-lin;The Fourth Engineering Co.,Ltd.of CCCC First Highway Engineering Co.,Ltd.;

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