摘要
地铁盾构隧道施工中采用同步注浆来抑制地层损失引起的地层沉降。以苏州轨道交通1号线为工程背景,选择地层特性、埋深等外部条件相似的3个试验段,分别研究同步注浆量、注浆压力和注浆材料等因素对地表沉降产生的影响,提出适用于苏州地区的盾构同步注浆参数及地层沉降控制措施。研究表明:建议注浆量采用3.5 m^(3)/环,注浆量超过3.5 m^(3)/环时,地表沉降控制效果不再明显;地表沉降受注浆压力波动影响较大,建议注浆压力保持在0.35~0.40 MPa范围内,不宜超过0.40 MPa,注浆压力过大会导致劈裂、跑浆,不利于沉降控制;可硬性浆液对地表沉降的控制效果比惰性浆液要好。
In shield tunneling,the synchronous grouting method is adopted to control the ground settlement caused by ground loss.Suzhou rail transit Line I is taken as the engineering background,3 test sections with similar external conditions like formation characteristics and buried depth are selected,to study the influencing factors of grouting amount,grouting pressure and grouting materials on ground settlement respectively.On this basis,synchronous grouting parameters of shield and stratum settlement control measures suitable for Suzhou area are proposed.The research shows that when the grouting amount per loop is more than 3.5 m^(3),the effect of surface settlement control is no longer obvious;since the surface settlement is greatly influenced by the fluctuation of grouting pressure,it is recommended that the grouting pressure be controlled within 0.35~0.4 MPa range,or the higher pressure will cause the splitting and slurry running,not conductive to settlement control;the cement grout performs better on ground settlement inhabitation than the ordinary grout without cement.
作者
颜静
王飞
付春青
刘维
史培新
YAN Jing;WANG Fei;FU Chunqing;LIU Wei;SHI Peixin(不详;School of Rail Transportation,Soochow University,215131,Suzhou,China)
出处
《城市轨道交通研究》
北大核心
2021年第10期48-53,共6页
Urban Mass Transit
基金
国家自然科学基金项目(51978430,51778386)。
关键词
地铁盾构隧道
同步注浆
地表沉降
现场试验
shield tunneling
synchronous grouting
ground settlement
field experiment
