| 地铁隧道下穿小河和桥梁的施工方案研究 |
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| 引用本文： | 李奎,高波.地铁隧道下穿小河和桥梁的施工方案研究[J].岩土力学,2010,31(5):1509-1516. |
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| 作者姓名： | 李奎 高波 |
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| 作者单位： | 西南交通大学 地下工程系，成都 610031 |
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| 基金项目： | 西南交通大学校科学基金 |
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| 摘 要： | 综合工程经验，对北京地铁5号线过河过桥隧道施工可能采用的4种超前支护方案即水平旋喷桩、全断面深孔注浆、长管棚、加密小导管注浆并辅以临时仰拱进行初步分析，认为加密小导管方案在施工造价、掘进速度和施工影响方面具有优势。采用三维数值模拟方法对长管棚方案和加密小导管方案进行进一步评价并择优。数值模拟结果显示，在不计管棚施工对地层提前扰动的情况下，长管棚方案与加密小导管方案对桥台、桥墩以及小月河河底的影响是相当的，可以认为，加密小导管方案将优于长管棚方案；长管棚、小导管和锁脚小导管承受弯矩较小，锁脚小导管以及隧道拱部的小导管承受轴压力，边墙的小导管既承受轴压力又承受轴拉力，长管棚主要承受轴拉力。
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| 关 键 词： | 浅埋隧道 方案优选 地层位移控制 工程经验 数值模拟 |
| 收稿时间： | 2008-11-17 |
Study of construction schemes for metro tunnel crossing river and bridge |
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| LI Kui,GAO Bo.Study of construction schemes for metro tunnel crossing river and bridge[J].Rock and Soil Mechanics,2010,31(5):1509-1516. |
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| Authors: | LI Kui GAO Bo |
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| Institution: | Department of Tunnel and Underground Engineering, Southwest Jiaotong University, Chengdu 610031, China |
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| Abstract: | The four forepoling schemes such as horizontal drilling jet-grouting peg, full face deep boring grouting, long pipe roof grouting, space between-reduced little tremie grouting with constructing temporary invert, which were possibly adopted to the tunnel crossing river and bridge on line 5 of Beijing metro, were analyzed initially by using engineering experience. The comparison shows that the scheme of space between-reduced little tremie grouting has superiority in construction cost as well as rate of tunnelling and construction impact. Then, the scheme of long pipe roof grouting as well as the scheme of space between-reduced little tremie grouting were evaluated farther and compared by using three-dimensional numerical simulation. The numerical simulation results show that the impact on the bridge abutments, bridge piers and river bottom stratum produced in the scheme of long pipe roof grouting and the scheme of space between-reduced little tremie grouting respectively is equivalent in the condition of taking no account of stratum advance disturbance caused by the construction of long pipe roof. Therefore, the scheme of space between-reduced little tremie grouting will exceed the scheme of long pipe roof grouting in the condition of taking account of stratum advance disturbance caused by the construction of long pipe roof. The long pipe roofs as well as little tremies and foot-locking little tremies bear smaller bending moment. The foot-locking little tremies and little tremies belonging to tunnel crown will bear the axial pressure; little tremies belonging to tunnel side will bear both axial pressure and axial tensile force, while long pipe roofs will suffer mostly axial tensile force. |
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| Keywords: | shallow tunnel scheme optimization ground displacement control engineering experience numerical simulation |
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