粉质黏土层土压平衡盾构施工中的渣土改良技术
易鹏程1陈志敏1张常书2
Residue Improvement Technology for EPB Shield Construction in Silty Clay Soil
YI PengchengCHEN ZhiminZHANG Changshu
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作者信息:1.兰州交通大学土木工程学院,730070,兰州；
2.中铁十八局集团有限公司,300222,天津
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Affiliation:School of Civil Engineering, Lanzhou Jiaotong University, 730070, Lanzhou, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2021.12.036
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中图分类号/CLCN:U455.49
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栏目/Col:应用技术
摘要:
以广州地铁土压盾构粉质黏土层为背景，对盾构刀盘“结饼”、机具磨损严重等问题进行渣土改良研究，并进行试验段施工参数验证，确定合理的改良参数。主要结论：泡沫改良剂最佳质量分数范围为3%～4%；渣土改良较佳效果的塌落度指标为140～160 mm，较为合适的泡沫掺入比范围为20%～25%；现场每环泡沫剂用量为28.9～36.3 L；改良后渣土塌落度、抗剪强度、渗透系数等物理力学参数降低明显；改良段施工参数达到合理可控范围。
Abstracts:
Taking the silty clay soil of Guangzhou Metro earth pressure shield construction as background, problems of "cake forming" of the cutter plate and severe wear of the machine are studied targeting residue improvement, and construction parameters are verified at test section to determine reasonable improvement parameters. Main conclusions are: the optimal mass concentration range of foam improver is 3%~4%; the collapse degree index with better residue improvement effect is 140 mm~160 mm; the appropriate foam incorporation ratio is 20%~25%; dosage of foam agent per ring on site is 28.9~36.3 L; the physical and mechanical parameters such as residue collapse degree, shear strength and permeability coefficient, are significantly reduced after the improvement; the construction parameters of the improved section has reached a reasonable and controllable range.
引文 / Ref:
易鹏程，陈志敏，张常书.粉质黏土层土压平衡盾构施工中的渣土改良技术[J].城市轨道交通研究，2021，24(12):177.
YI Pengcheng，CHEN Zhimin，ZHANG Changshu.Residue improvement technology for EPB shield construction in silty clay soil[J].Urban Mass Transit，2021，24(12)：177.
YI Pengcheng，CHEN Zhimin，ZHANG Changshu.Residue improvement technology for EPB shield construction in silty clay soil[J].Urban Mass Transit，2021，24(12)：177.
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