富水砂层地铁盾构隧道渣土混合改良的流塑性与渗透性
郑选荣1刘莹1丁鹏程1李鹏2郭峰2陆宏朝2李军锋2
Study on Flow Plasticity and Permeability of Mixture Conditioned Muck for Metro Shield Tunnel in Water-rich Sand Stratum
ZHENG Xuanrong1LIU Ying1DING Pengcheng1LI Peng2GUO Feng2LU Hongchao2LI Junfeng2
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作者信息:1.西安科技大学建筑与土木工程学院， 710054， 西安
2.中铁北京工程局集团有限公司， 230088， 合肥
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Affiliation:1.College of Architecture and Civil Engineering, Xi’an University of Science and Technology, 710054, Xi’an, China
2.China Railway Beijing Engineering Group Co., Ltd., 230088， Hefei, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.03.007
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中图分类号/CLCN:U411.4∶U455.43
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栏目/Col:研究报告
摘要:
［目的］盾构在富水砂层中掘进时，易产生刀盘扭矩过高、磨损严重以及螺旋运输机喷涌等问题。为了保证施工的安全性，需对渣土进行改良。［方法］以西安地铁16号线某盾构区间工程为依托，根据砂土地层自稳性差、摩擦性高、渗透率高的特点选取渣土改良剂。通过渣土坍落度试验、渗透试验、现场试验相结合的方式，采用泡沫单独改良、泡沫及膨润土泥浆混合改良两种方案开展富水砂层渣土改良试验研究。［结果及结论］实际盾构掘进施工中，在考虑安全、高效、经济的前提下，结合室内试验所得数据，确定采用膨润土泥浆、泡沫混合改良的方案。当膨润土与水质量比为1/8，发泡液质量分数为3%时，改良剂性能满足施工要求；泡沫单独改良渣土受含水率影响大，含水率越高，泡沫最佳注入率越小。中砂的最佳改良方案是BIR（膨润土泥浆注入比）为10%，FIR（泡沫注入率）为20%~25%；砾砂的最佳改良方案是BIR为10%，FIR为35%~40%。工程实践表明，渣土混合改良效果良好，盾构掘进参数平稳。
Abstracts:
［Objective］ When tunnel boring machine advancing in the water-rich sand layer, problems such as high cutter torque, serious wear and spout of the screw conveyer can be easily generated. In order to ensure the safety of construction, it is necessary to improve the muck. ［Method］ Based on a shield tunnel section project of Xi’an Metro Line 16, the muck modifier is selected according to the characteristics of poor self-stability, high friction and high permeability of sandy soil stratum. By combining slump test, permeability test and on-site test, two schemes of foam alone conditioning and mixed foam-bentonite slurry conditioning are used to carry out the experimental research on muck conditioning in water-rich sand layer. ［Result & Conclusion］ In the actual shield tunneling construction, on the premise of safety, efficiency and economy and based on the data obtained in laboratory tests, the conditioning scheme of mixed foam-bentonite slurry is adopted. The performance of the modifier meets the requirements of shield tunneling construction when the ratio of bentonite to water is 1/8 and the foam mass fraction is 3%. The muck conditioning by foam alone is greatly affected by water content. The higher the water content is, the smaller the optimal foam injection rate (FIR) becomes. The best muck conditioning option for medium sand is 10% of the bentonite slurry injection ratio (BIR) and 20%~25% of FIR. The best muck conditioning option for gravel sand is 10% of BIR and 35%~40% of FIR. Engineering practice shows that the muck conditioning has good effect and the parameters of shield tunneling are stable.
- 上一篇: 地铁隧道砂土劈裂注浆加固机理分析
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