摘要
以北京地铁14号线高家园站-京顺站区间大直径盾构隧道工程为背景,基于北京轨道交通工程施工安全风险监控系统开展地层变形监测试验,研究在大直径土压平衡盾构施工诱发的地层横向和纵向变形规律。研究结果表明:大直径盾构施工诱发地层变形规律总体符合Peck沉降曲线,但由于地层差异和施工控制等原因,沉降槽两侧并不完全对称,横向影响范围约为隧道两侧20 m,纵向影响范围约为盾体前后60 m,变形值在0^-25 mm之间;盾构通过和盾尾脱离管片时地层变形较大,两者之和通常大于总沉降的60%;同步注浆控制地层变形效果显著,但有一定时间的延滞,必须根据风险要求控制好浆液的凝结时间。
Based on the large diameter earth pressure balance shield tunneling project of Beijing Metro Line 14, shielding interval from Gaojiayuan station to Jingshtm station, strata deformation laws induced by large diameter shield tunnelling engineering were studied according to the field monitoring tests by Safety Risk Monitoring System of Bering Subway Engineering. The testing results showed that although deformation curves were not completely symmetrical due to the causes of strata and construction control differences, deformation laws of strata induced by large earth pressure balance shield tunnelling were in line with Peck settlement curve. After shield tunnelling, lateral influence scope was about 20 meters on both sides of shield tunnel, longitudinal influence scope was about 60 meters both in the front and at back of the shield tunnel, and the deformation value was 0 - - 25 mm. Strata deform- ation was very obvious when shield tunnelling goes through the section and shield tail is off the segment rings, whose deformation was more than 60% of total deformation. Synchronous grouting was very helpful and significant to control strata deformation in- duced by shield tunnelling. It was necessary to control grouting slurry solidifying time according to risk control.
出处
《都市快轨交通》
北大核心
2015年第2期94-97,共4页
Urban Rapid Rail Transit
基金
国家自然科学基金重点项目(U1261212)
关键词
北京地铁
大直径
土压平衡盾构
纵向变形
横向变形
Beijing metro
large diameter
earth pressure balance shield
longitudinal deformation
lateral deformation
