| 泥水盾构带压开舱时压力舱内不同泥浆液位下开挖面稳定性分析? |
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| 引用本文： | 俞超杰,陈健,陈 胜,闵凡路.泥水盾构带压开舱时压力舱内不同泥浆液位下开挖面稳定性分析?[J].防灾减灾工程学报,2020(2):251-259. |
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| 作者姓名： | 俞超杰 陈健 陈 胜 闵凡路 |
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| 作者单位： | 河海大学岩土力学与堤坝工程教育部重点实验室，江苏 南京 210098；河海大学土木与交通学院，江苏 南京 210098;中国海洋大学环境科学与工程学院，山东 青岛 266100；中铁十四局集团有限公司，山东 济南 250014;江苏省岩土工程公司，江苏 南京 210009 |
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| 基金项目： | 国家自然科学基金项目（51778213）；中央高校基本科研业务费专项资金（B200202073）资助 |
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| 摘 要： | 泥水盾构在水下复杂地层带压开舱作业时,一般会根据实际情况将压力舱内泥浆降低至一定的液位。依托武汉地铁8号线越江隧道工程带压开舱作业实例,采用FLAC3D软件,对不同泥浆液位下盾构隧道开挖面主被动极限支护力及失稳破坏模式进行研究。结果表明:对于本工程上土下岩的复合地层带压开舱工况而言,不同泥浆液位下开挖面主动破坏均属于整体失稳破坏,且随着泥浆液位的降低,主动极限支护力先增后减,开挖面敏感区域逐渐下移并扩大,液位下降至隧道中心处时主动极限支护力最小;不同泥浆液位下开挖面的被动破坏均属于局部失稳破坏,被动极限支护力呈逐渐降低的趋势,最敏感区域均位于开挖面上半部;当泥浆液位降低至隧道中心以下时,隧道拱顶处支护力显著大于地层土水压力,此时开挖面面临较严峻的被动失稳风险,因此实际施工时不建议液位下降至隧道中心以下。
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| 关 键 词： | 泥水盾构 带压开舱 泥浆液位 开挖面稳定性 极限支护力 |
Stability Analysis on Excavation Face at Different Slurry Levels When Chamber opens under Pressure in Slurry Shield |
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| YU Chaojie,CHEN Jian,CHEN Sheng,MIN Fanlu.Stability Analysis on Excavation Face at Different Slurry Levels When Chamber opens under Pressure in Slurry Shield[J].Journal of Disaster Prevent and Mitigation Eng,2020(2):251-259. |
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| Authors: | YU Chaojie CHEN Jian CHEN Sheng MIN Fanlu |
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| Abstract: | When the chamber of slurry shield is opened under pressure in complex strata below water, the slurry level in the pressure chamber generally reduces to a certain level according to the practical situation. Focusing on the stability of excavation face at different slurry levels, relying on the example of opening operation under pressure of Wuhan Metro Line 8 cross-river tunnel project, the Flac3D software was used to study the active and passive ultimate support force and failure mode of the excavation face at different slurry levels. The results show that, as in the case of the opening operation under pressure in soil-rock composite strata, the active failure of the excavation face at different slurry levels belongs to overall instability failure. With the decrease of the slurry level, the limit active support force first increases and then decreases and the sensitive area on the excavation face gradually moves down and expands. The limit active support force reaches the minimum as the level drops to the center of the tunnel. Passive failure of the excavation face at different slurry levels belongs to local instability failure. The passive limit support force gradually decreases. Most sensitive area is located on the up half part of the excavation face. When the slurry level descends to below the center of the tunnel, the support force at the tunnel crest is significantly greater than the water and earth pressure. At this time, the excavation face encounters a severe risk of passive instability. Therefore, a slurry level below the center of the tunnel is not recommended during practical construction |
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