基于压力传递特性的富水砂层土压平衡盾构渣土改良试验研究
蒋亚龙1黄玉龙1余金2黄展军3朱碧堂1
Muck Improvement Experiment of Earth Pressure Balance Shield Tunnel in Water-rich Sand Layer Based on Pressure Transfer Characteristic
JIANG Yalong1HUANG Yulong1YU Jin2HUANG Zhanjun3ZHU Bitang1
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作者信息:1.华东交通大学土木建筑学院，330013，南昌
2.江西水利职业学院建筑工程系，330013，南昌
3.南昌轨道交通集团有限公司，330038，南昌
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Affiliation:1.School of Civil Engineering and Architecture, East China Jiaotong University, 330013, Nanchang, China
2.Department of Architectural Engineering, Jiangxi Water Resources Institute, 330013, Nanchang, China
3.Nanchang Urban Rail Group Co., Ltd., 330038, Nanchang ,China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.08.039
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中图分类号/CLCN:TU411.2∶U455.43
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栏目/Col:研究报告
摘要:
［目的］富水砂层由于渗透性强、含水率高等特点，在盾构掘进过程中易因渣土改良不善而导致螺旋输送机出现喷涌以及刀盘结泥饼等事故，从而影响盾构施工效率，因此需对富水砂层土压平衡盾构渣土改良试验进行研究。［方法］依托南昌地铁4号线七里站—民园路西站区间典型富水砂层工况，开展室内渣土改良试验。采用自制盾构土舱模型装置对不同改良渣土进行土舱模型试验，基于渣土压力传递特性建立不同改良渣土的坍落度、渗透系数及土压传递系数K0之间的相关关系，研究不同K0下的渣土改良效果。［结果及结论］单独采用泡沫对渣土改良时，渣土的K0与坍落度呈正相关，而与渣土的渗透系数呈负相关，而当渣土的坍落度超过200mm时，K0会逐步减小。为达到富水砂层土压平衡盾构中理想的渣土改良要求，改良剂配合比建议为：泡沫注入率为25%，或添加的膨润土泥浆注入率为10%。室内试验和土舱模型试验表明：K0越大，渣土改良效果越好；实际工程中单独采用泡沫进行渣土改良后改良渣土的理想的K0为0.60~0.65；而泡沫与膨润土泥浆相结合对渣土改良时，改良渣土理想的K0约为0.85。
Abstracts:
［Objective］ Due to the characteristics of strong permeability and high water content in water-rich sand layer, the poor muck improvement can easily cause accidents such as spout spilling of screw conveyor and mud cake formation on the cutter plate during shield tunneling, thus affecting shield construction efficiency. So it is necessary to study the muck improvement of earth pressure balance shied tunnel in water-rich sand layer. ［Method］ Based on the typical water-rich sand layer working conditions in Qili Station-Minyuan Road West Station interval on Nanchang Metro Line 4, an indoor muck improvement experiment is carried out. The self-made shield soil chamber model device is used to implement soil chamber model experiments on different improved mucks. Based on muck pressure transfer characteristics, the correlations among slump, permeability coefficient and earth pressure transfer coefficient K0 of different improved mucks are established, and the improvement effect of muck under different K0 is studied. ［Result & Conclusion］ When foam is used alone to improve the muck, the transfer coefficient K0 of muck is positively correlated with slump, but negatively correlated with permeability coefficient of the muck. When the slump of the muck exceeds 200 mm, K0 decreases gradually. In order to achieve the ideal requirements of muck improvement for earth pressure balance shield in water-rich sand layer, the matched ratio of conditioners is suggested as follows: 25% of foam injection, or 10% injection rate of added bentonite mud. Laboratory and soil chamber model experiments show that the greater K0 is, the better the improvement effect of muck will be. In actual projects, the ideal K0 value of improved muck by using foam alone is 0.60-0.65. While foam and bentonite slurry are combined to improve the muck, the ideal K0 of improved muck is about 0.85.
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