不同管片张开量下隧道外水土流失规律试验研究

郑刚; 姚杰; 戴轩; 杨新煜; 孙佳羽

doi:10.11779/CJGE201806001

不同管片张开量下隧道外水土流失规律试验研究 English Version

郑刚^{1, 2},
姚杰^{1, 2},
戴轩³,
杨新煜^1,2, ,,
孙佳羽^{1, 2}

1. 天津大学滨海土木工程结构与安全教育部重点试验室,天津300072;
2. 天津大学水利工程仿真与安全国家重点试验室,天津 300072;
3. 天津市市政工程设计研究院,天津 300051

基金项目: 国家自然科学基金重点项目（41630641）; 国家重点研发计划（2016YFC0802008）

详细信息

作者简介:
郑刚(1967- ),男,博士,教授,博士生导师,主要从事土力学及岩土工程方面的教学和研究工作。E-mail：zhenggang1967@163.com。

通讯作者:
杨新煜，E-mail：yxy0038@126.com

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出版历程
- 收稿日期: 2017-03-13
- 发布日期: 2018-06-24

Experimental study on sand inflow under different opening widths of shield tunnel segments

ZHENG Gang^{1, 2},
YAO Jie^{1, 2},
DAI Xuan³,
YANG Xin-yu^1,2, ,,
SUN Jia-yu^{1, 2}

1. Key Laboratory of Coast Civil Structure Safety of Ministry of Education, Tianjin University, Tianjin 300072, China;
2. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China;
3. Tianjin Municipal Engineering Design and Research Institute, Tianjin 300051, China

摘要

摘要: 盾构隧道管片接缝漏水并导致管片外土体侵蚀、甚至发生漏水漏砂,是富水砂层中盾构隧道安全的主要风险。设计了一种模拟管片在不同张开量下土体流失状态的试验设备,对福建标准砂和天津典型细砂在不同管片张开量及水压下的土体流失状态进行了试验研究。试验揭示了管片外砂土逐步流失的机理,发现不考虑土颗粒作用的传统水密性试验会高估弹性密封垫的防水性能;提出了临界侵蚀张开量的理论公式,并通过试验结果初步验证了其合理性。研究表明,临界侵蚀张开量与土颗粒竖向所受应力和土层厚度成一次正比关系,与缝隙处水头、土体孔隙率成一次反比关系;当土体通过管片缝隙发生侵蚀后,侵蚀质量与管片张开量和水压成正比,与缝隙周围的有效应力大小成反比,侵蚀使福建标准砂级配曲线变得更加平缓;针对福建标准砂及天津细砂,提出了便于实际应用的考虑水压及管片张开量的土体流失状态评估方法。
- 临界缝隙宽度 /
- 模型试验 /
- 漏水 /
- 土体侵蚀 /
- 漏砂
Abstract: For the tunnel accident caused by water leakage, soil erosion and sand and water loss in water-rich sand stratum, in order to quantify the risks of tunnels, a new shield tunnel seepage simulation test device is developed considering the interaction between elastic sealing gasket, soil and water. The states of soil loss of Fujian standard sand and Tianjin fine sand under different gap widths and water pressures are studied through experiments. The leakage mechanism due to invasion of sand is revealed and proved by the test results. It is shown that the traditional test methods will overestimate the waterproof property of elastic sealing gaskets without considering the influence of soil. The formula for estimating the critical gap width of soil erosion is derived, and verified by the test results. The critical gap width of soil erosion is proportional to the vertical stress and soil thickness, and is inversely proportional to the soil porosity and hydraulic pressure around gap. When soil erosion happens, the mass loss is proportional to the gap width and hydraulic pressure, and is inversely proportional to the effective stress in the soil around gaps. The soil erosion makes the gradation curve smoother. For Fujian standard sand and Tianjin fine sand, a practicable assessment method for the state of soil loss is put forward considering pressure and segment gap.
- critical gap width /
- model test /
- water leakage /
- soil erosion /
- sand leakage

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参考文献(16)

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