摘要
土压平衡盾构机在砂性地层中掘进时,因颗粒间的摩擦阻力、渗透系数大等原因需要进行渣土改良,但目前国内尚未系统地制定某类地层渣土改良的技术标准,因此采用室内试验和现场论证的方法进行渣土改良试验,以泡沫土的搅拌(扭矩)、坍落度、压缩性、直剪性能和渗透性5个方面作为渣土改良的评价依据。通过对泡沫剂改良渣土的主要性能指标进行量化研究,得出了泡沫剂改良渣土的最佳注入比;通过实际工程应用,验证了泡沫剂在渣土改良中效果较明显,推力、刀盘扭矩、螺旋输送机扭矩、土仓压力等施工参数都得到了改善,为实际工程提供了助力。
When earth pressure balance shield machine(EPBM)tunnels in sandy stratum,it is necessary to improve the slag soil due to the large friction resistance between particles and large permeability coefficient.At present,there is no systematic standard for the improvement index of slag soil in a certain kind of stratum in China.In this paper,the improvement test of foam material shield muck are carried out by the laboratory test and field demonstration method,and the five aspects of foam soil mixing(torque),slump,compressibility,direct shear performance and permeability are the evaluation basis.Through the quantitative study on the main performance indexes of foam agent residue soil improvement,the optimal injection ratio of foam agent residue soil improvement is obtained;Through practical engineering application,it is verified that the effect of foam agent in residue soil improvement is obvious and the construction parameters of thrust,cutter head torque,screw conveyor torque and silo pressure are improved which provide assistance for engineering practice.
作者
王凯丽
齐东
马岩
尤波涛
师正阳
郑睿
郭鸣扬
孙滢乔
Wang Kaili;Qi Dong;Ma Yan;You Botao;Shi Zhengyang;Zheng Rui;Guo Mingyang;Sun Yingqiao(Beijing Municipal Construction Group Co.,Lid.,Bejing 100089,China;Beijing Gaoxin Municipal Engineering Technology Co.,Ltd.,Beijing 100195,China)
出处
《市政技术》
2022年第10期125-135,共11页
Journal of Municipal Technology
基金
北京市政建设集团有限责任公司自主研究开发项目(2017-26)。
关键词
土压平衡盾构
砂性地层
泡沫剂
渣土改良
性能指标
earth pressure balance shield
sandy stratum
foam agent
soil improvement
performance index
