| 仰坡连拱隧道施工力学特性及控制技术研究 |
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| 引用本文： | 邹春华,朱洪雪,晏启祥.仰坡连拱隧道施工力学特性及控制技术研究[J].路基工程,2018,0(5):128-132. |
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| 作者姓名： | 邹春华 朱洪雪 晏启祥 |
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| 作者单位： | 1.西南交通大学交通隧道工程教育部重点实验室, 成都 610031 |
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| 基金项目： | 国家自然科学基金项目（51278425） |
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| 摘 要： | 以沪昆高速贵阳至清镇段的灯草塘连拱隧道为背景，建立FLAC3D数值分析模型，研究了复杂地质条件下大跨度双连拱隧道施工过程中隧道洞口段隧道-仰坡体系应力应变变化规律，并分析了锚索对仰坡体的滑动作用与效果。结果表明:隧道三导洞开挖各阶段对中墙应力大小及分布规律有很大影响，隧道开挖完后，应力集中部位主要在中墙的腰部和底部位置，滑动面附近的坡体产生了较大面积的塑性区；锚索的施加，对坡体和围岩的应力重分布产生了一定的影响，有效减少了坡体塑性区的面积，降低了塑性区贯通。根据研究结果，提出控制隧道施工过程中进口段隧道仰
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| 关 键 词： | 连拱隧道 仰坡 锚索 塑性区 控制技术 |
| 收稿时间： | 2019-11-11 |
Study on Construction Mechanics Characteristics and Control Technology of Double-arch Tunnel |
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| Abstract: | Based on Dengcaotang double-arch tunnel from the Guiyang to Qingzhen section of the Shanghai-Kunming Highway, a numerical analysis model is established using FLAC3D. The stress and strain change rules of the tunnel-slope system at the tunnel entrance during the construction of the long-span double-arch tunnel under complex geological condition are studied, and the anchor-cables’ effect on the front slope sliding. Results show that the three-pilot excavation stages have significant influence on the stress intensity and distribution of the middle wall. After the tunnel excavation completion, the stress mainly concentrates at the waist and bottom part of the middle wall; a large area of plastic zone is formed in the slope near the sliding surface. As the amount of arch cables increase, the stress in the slope and surrounding rock redistributes; the proportion of the plastic area in the slope is effectively reduced and the amount of cut through of plastic areas is decreased. Engineering techniques to control the stability of the front slope at the tunnel entrance during construction are proposed based on the research. |
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