摘要
以南通市富水砂层轨道交通1号线为工程背景,配制适用于富水砂层的高性能盾构注浆材料,并通过对比研究了高性能注浆材料与现场既有浆液的注浆性能以及对盾构施工参数的影响规律。结果表明:与采用既有浆液的标段相比,使用高性能同步注浆材料的试验段盾构机土舱压力由0.22 MPa升至0.25 MPa,平均推力由12000 kN升至15000 kN,刀盘扭矩由1150 kN·m升至1450 kN·m,注浆量由5.7 m^(3)降为5.2 m^(3),地表沉降仅为8.15 mm,材料成本显著降低,地表沉降得到有效控制。进一步分析各个关键施工参数之间的相互联系,得到注浆量持续降低会对盾构机的土舱压力、推力、扭矩产生一定影响;盾构机保持匀速前进时,盾构机土舱压力、推力、扭矩的变化规律曲线具有一致性。
A high-performance shield grouting material suitable for water-rich sand layer is prepared on the basis of the engineering background of Nantong Rail Transit Line 1 in water-rich sand layer.Then,comparative study is performed for the grouting performances of the prepared high-performance grouting material and existing grout used on the site as well as their influence law on shield construction parameters.The results show that:compared with the lot section used with existing grouts,the shield machine in the test section used with high-performance synchronous grouting material has the following properties:the soil chamber pressure increases from 0.22 MPa to 0.25 MPa,the average thrust increases from 12000 kN to 15000 kN,the cutter head torque increases from 1150 kN·m to 1450 kN·m,the grouting amount decreases from 5.7 m^(3) to 5.2 m^(3) and the surface settlement is only 8.15 mm,so that the material cost is significantly reduced and the surface settlement could be effectively controlled.Furthermore,the relationship among key construction parameters of the shield is analyzed to find that the continuous reduction of grouting volume might have a certain impact on the soil chamber pressure,thrust and torque of the shield machine;when the shield machine drives at a constant speed,the variation laws of the curves of the soil chamber pressure,shield thrust and torque are consistent.
作者
高鹏鹏
徐方
宋普涛
王宁宁
张伟
GAO Pengpeng;XU Fang;SONG Putao;WANG Ningning;ZHANG Wei(School of Engineering(Wuhan),China University of Geosciences,Wuhan 430074;China Academy of Building Research Co.,Ltd.,Beijing 100013;JSTI Group Co.,Ltd.,Nanjing 210000;Nantong Urban Rail Transit Co.,Ltd.,Nantong 226000)
出处
《现代隧道技术》
CSCD
北大核心
2021年第6期244-250,共7页
Modern Tunnelling Technology
基金
南通城市轨道交通有限公司科研项目.
关键词
盾构施工
高性能同步注浆材料
富水砂层
施工参数
Shield construction
High-performance synchronous grouting material
Water-rich sand layer
Construction parameters
