| 饱和圆砾地层盾构隧道开挖面稳定性物理模型试验 |
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| 引用本文： | 吕玺琳,曾盛,王远鹏,马少坤,黄茂松. 饱和圆砾地层盾构隧道开挖面稳定性物理模型试验[J]. 岩土工程学报, 2019, 41(Z2): 129-132. DOI: 10.11779/CJGE2019S2033 |
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| 作者姓名： | 吕玺琳 曾盛 王远鹏 马少坤 黄茂松 |
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| 作者单位： | 1. 同济大学岩土与地下工程教育部重点实验室,上海 200092;2.同济大学地下建筑与工程系,上海 200092;3. 广西大学土木建筑工程学院,广西 南宁 530004;4. 广西大学工程防灾与结构安全重点实验室,广西 南宁 530004 |
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| 基金项目： | 国家重点研发计划项目（2016YFC0800200）; 国家自然科学基金重点项目（51738010）; 国家自然科学基金面上项目（51678166）; 上海市浦江人才计划项目（17PJD040） |
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| 摘 要： | 通过开展3组饱和圆砾地层盾构隧道开挖面稳定性物理模型试验,研究了不同埋深条件下开挖面支护压力不足导致的渐进失稳破坏过程。通过分析大颗粒土滑移松动—裂隙出现—裂隙闭合过程表明,开挖面破坏过程中土体存在变形滞后效应,且该效应随隧道埋深变浅而减弱。对开挖面变形进行PIV精细化图像分析,得到其破坏模式类似于楔形体加筒仓体结构,楔形体倾角约为45°+φ/2。筒仓区土体松动由于存在滞后效应,可能导致开挖面破坏表现出突发现象。为准确预测极限支护压力,将传统楔形体模型改进为宽体楔形体模型,预测结果与试验结果符合较好。
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| 关 键 词： | 盾构隧道 圆砾土 开挖面稳定性 物理模型试验 |
| 收稿时间： | 2019-04-30 |
Physical model tests on stability of shield tunnel face in saturated gravel stratum |
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| L,#xdc,Xi-lin,ZENG Sheng,WANG Yuan-peng,MA Shao-kun,HUANG Mao-song. Physical model tests on stability of shield tunnel face in saturated gravel stratum[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(Z2): 129-132. DOI: 10.11779/CJGE2019S2033 |
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| Authors: | LÜ Xi-lin ZENG Sheng WANG Yuan-peng MA Shao-kun HUANG Mao-song |
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| Affiliation: | 1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China;2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092,China;3.College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China;4.Key Laboratory of Disaster Prevention and Structural Safety, Guangxi University, Nanning 530004, China |
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| Abstract: | To detect the stability of tunnel face with different depth in saturated gravel stratum, three reduced scale model tests were conducted, and the progressive failure process under insufficient support pressure was explored. According to the particle analysis, loosens of particle contact and the initiation and closure of crack were investigated, the results indicate that delayed deformation occurs and it can be weakened by decreasing the tunnel depth. Based on the PIV analysis, the failure mode of tunnel face is obtained, it shows a combination mode of a sliding wedge and an overlying silo, and the inclination of sliding wedge is about 45°+φ/2. Due to the delayed deformation of soil in silo, a sudden collapse mode of tunnel face may occur. In order to produce a precise prediction of limit support pressure, a modified wedge model is proposed, and the obtained results compare well with test results. |
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| Keywords: | shield tunnel gravel soil tunnel face stability physical model test |
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