| 上软下硬地层双线地铁隧道下穿既有城市道路地层变形规律研究 |
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| 引用本文： | 胡德华,段景川.上软下硬地层双线地铁隧道下穿既有城市道路地层变形规律研究[J].防灾减灾工程学报,2017(6):910-915. |
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| 作者姓名： | 胡德华 段景川 |
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| 作者单位： | 中电建南方建设投资有限公司， 广东 深圳 518000 |
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| 基金项目： | 国家自然科学基金项目(51036007)资助 |
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| 摘 要： | 上软下硬地层地区进行隧道开挖时,常引起较大的地表沉降,危及地表构筑物。依托深圳地铁7号线安托山停车场出入线下穿深圳北环大道工程,采用现场监测研究方法,对该类地层双线隧道下穿既有道路引起的围岩及地层位移进行研究。研究结果表明:道路荷载对隧道围岩沉降有较大影响,当双线隧道间距较小时,全断面注浆对注浆段上方较浅地层位移影响较明显,对临近隧道较深处影响较明显,全断面注浆对地面沉降有较好的控制作用,但要注意控制隆起,该工程中全断面注浆对注浆加固圈以外8 m内影响较大,8~13 m范围影响较小。通过多种监测手段相结合,可以更好的保障施工安全。
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| 关 键 词： | 上软下硬地层 地层沉降 双线隧道施工 监控量测 |
| 收稿时间： | 2016/7/1 0:00:00 |
| 修稿时间： | 2016/12/12 0:00:00 |
Research on Deformation Law of Different Layers during Metro Tunnel ConstructionUndercrossing the Existing Urban Road in Upper-soft and Lower-hard Ground |
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| HU Dehu,DUAN Jingchuan.Research on Deformation Law of Different Layers during Metro Tunnel ConstructionUndercrossing the Existing Urban Road in Upper-soft and Lower-hard Ground[J].Journal of Disaster Prevent and Mitigation Eng,2017(6):910-915. |
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| Authors: | HU Dehu DUAN Jingchuan |
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| Affiliation: | ElectricPower Construction South Construction Investment Co.Ltd., Shenzhen 518000 , China |
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| Abstract: | Large surface settlement is often caused when there aretunnels constructing in the upper-soft lower-hard ground. Taking the antuo-mountain entrance/exit lines of Shenzhen subway line 7, which pass under the North ring Road, as an example, the essay combines numerical simulation with field monitoring to make researches. Based on the utilization of monitoring measurement, the essay analyses the surrounding rock and s stratum deformation law during thetunnel pass under the existed road. The result shows: The loading on road surface has significant impact on settlement of tunnel surrounding rocks. When the distance between twin tunnels is relatively small, the full-section grouting methodobviously influenced the deformation of shallow strata above the grouting interval, and so is the deeper part near the tunnel. Full-section grouting methodhas positive effect on surface settlement controlling, while it is important toconcern the upheaval. In this project, the full-section grouting method impact harder on the parts which is 8 meters beyond the reinforcing ring. And the full-section grouting method impact weaker on the parts which is 8-13 meters beyondthe reinforcing ring. The comprehensive application of various monitoring methods ensures the construction safety. |
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