大粒径卵石地层土压平衡盾构施工的渣土改良
吉力此且1,2路军富1王国义3
Muck Improvement in EPB Shield Construction in Large Pebble Stratum
JILI CiqieLU JunfuWANG Guoyi
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作者信息:1.1.成都理工大学地质灾害防治与地质环境保护国家重点实验室， 610059， 成都；
2.2.四川开放大学高职院， 610073， 成都；
3.3.中电建成都建设投资有限公司， 610212， 成都
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Affiliation:State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, 610059, Chengdu, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2022.08.028
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中图分类号/CLCN:U455.43
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栏目/Col:施工技术
摘要:
大粒径卵石地层土压平衡盾构掘进过程中，需针对不同的地层、地下水位、施工工艺等情况对土仓渣土进行改良。以成都地铁18号线一期工程为例，通过室内试验和理论分析，确定砂卵石地层土压平衡盾构理想渣土的流塑状态、低渗透率和低内摩擦角，提出了5个渣土改良方案，并开展相关试验对渣土改良效果进行分析。通过现场实践验证，提出了运用多种渣土改良组合措施，进而获得最优改良方案的新思路。试验结果表明，大粒径砂卵石地层渣土改良最优方案是膨润土泥浆加泡沫剂方案或含有聚合物的膨润土泥浆方案。
Abstracts:
In the process of EPB shield tunneling in large pebble stratum, it is necessary to improve the muck in the soil according to conditions including different stratum, groundwater level, construction process. Taking the first phase project of Chengdu Metro Line 18 as an example, through laboratory tests and theoretical analysis, the flow plastic state, low permeability, and low internal friction angle of the ideal EPB shield muck in sandy pebble stratum are determined. Five muck improvement solutions are put forward, and relevant tests are carried out to analyze the muck improvement effect. Through field practice verification, multiple muck improvement measures are put forward, and new viewpoint of optimal improvement solution is obtained.Test results show that the optimal solution for the improvement of large particle size sandy pebble stratum muck is bentonite slurry plus foam agent or bentonite slurry containing polymer.
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