地铁隧道砂土劈裂注浆加固机理分析
秦鹏飞1,2钟宏伟3
Mechanism Analysis of Sand Splitting Grouting in Metro Tunnel
QIN Pengfei1,2ZHONG Hongwei3
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作者信息:1.黄河科技学院工学部， 451001， 郑州
2.重庆交通大学水利水运工程教育部重点实验室， 400074， 重庆
3.郑州铁路职业技术学院铁道工程学院， 451010， 郑州
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Affiliation:1.Department of Engineering, Huanghe University of Science and Technology, 451001， Zhengzhou, China
2.Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education, Chongqing Jiaotong University, 400074， Chongqing, China
3.School of Railway Engineering, Zhengzhou University of Railway Vocational Technology, 451010, Zhengzhou, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.03.006
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中图分类号/CLCN:TU472.6：U459.3
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栏目/Col:研究报告
摘要:
［目的］地铁隧道砂土在注浆过程中，其砂土应力场与浆液流场存在动态耦合作用。为了提高地铁隧道砂土注浆设计水平，需对浆土耦合效应下的砂土劈裂注浆机理进行研究。［方法］将劈裂注浆扩散过程简化为对称扩张过程，以宾汉流体为代表对浆液流场的基本特征进行分析；将砂层视作线弹性变形的理想材料，采用均质各向同性的弹性假定，推导了劈裂通道宽度、浆液压力的时空变化方程；通过调节浆液黏度、砂土刚度等参数，对砂土劈裂注浆的基本规律进行了探讨。根据浆土耦合效应下砂土劈裂注浆的基本规律，对重庆地铁10号线二期兰花路站—后堡站区间中粗砂-粉土地层下的砂土劈裂注浆进行了现场验证，得到了主浆脉长度和次浆脉长度。［结果及结论］浆液压力在注浆起始和末尾阶段变化较为剧烈，而在中间阶段较为稳定。浆液黏度、砂土压缩模量是影响劈裂扩散规律的重要因素：浆液黏度和砂土压缩模量越小，浆液扩散半径越大；砂土压缩模量越大，劈裂通道宽度越小。工程验证发现，浆脉长度开挖检测值与理论计算值存在17%~22%的误差，表明该理论模型具有一定的工程应用价值。
Abstracts:
［Objective］ In the process of grouting in metro tunnel, there exists dynamic coupling effect between sand stress field and slurry flow field. In order to improve the design level of metro tunnel sand grouting, it is necessary to study the mechanism of sand splitting grouting under the coupling effect of slurry and sand. ［Method］ The splitting grouting diffusion process is simplified as a symmetric expansion process, and the basic characteristics of the slurry flow field are analyzed with Bingham fluid as the representative. The temporal and spatial variation equation of the splitting channel width and the slurry pressure is derived when the sand layer is treated as ideal linear elastic material and the elasticity is assumed to be homogeneous and isotropic. The basic law of sand splitting grouting is discussed by adjusting parameters such as slurry viscosity and sand stiffness. According to the basic law of sand splitting grouting under the coupling effect of slurry and sand, the sand splitting grouting under the coarse sand and silt soil layer in the section between Lanhua Rd. Station and Houbao Station of Chongqing Metro Line 10 phase II is verified on the spot, and the length of main and secondary slurry veins is obtained. ［Result & Conclusion］ The slurry pressure changes more sharply at the starting and ending stages of grouting, but is stable in the middle. Slurry viscosity and compression modulus of sand are important factors affecting the splitting diffusion law. The smaller the slurry viscosity and the compression modulus of sand, the larger the diffusion radius of the slurry becomes. While the larger the compression modulus of sand, the smaller the width of the splitting channel. Engineering verification shows that there is a 17%-22% deviation between the measured value and the calculated value, which indicates that the theoretical model has certain value for engineering application.
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