摘要
盾构机在穿越桥梁群桩基础路段时,对土体产生扰动,极易引起桩基位移,危及桥梁上部通行和地铁隧道施工安全。杭州地铁一号线采用二次注浆+钢花管注浆加固的方式,使浆液充分填充盾构尾端土体孔隙,土体稳定性提高,通过现场试验,靠近隧道桩基的横向位移减小20%以上,地表沉降量平均减少6.1mm,有效保证了桥梁结构和地铁施工安全。
It is dangerous for bridge traffic and subway tunnel construction when the shield machine crossing the bridge group pile foundation sections, because the soil is disturbed and transmission displacement of pile foundation. Hangzhou 1 Line Metro using second times grouting and steel pipe grouting technique, the slurry fully filled pores of soil in the end of shield, the soil becomes more stable, the field tests indicated that the lateral displacement of the tunnel close to pile reduced more than20 %. The average reduce of surface subsidence is 6. 1 mm, effectively ensured the safety of the bridge structure and the construction of the subway.
作者
赵东
施振丁
Zhao Dong Shi Zhending(Shaanxi Railway Institute, Weinan 714000, Shaanxi, China China Railway 16th Bureau Group Beijing Metro Engineering Construction Co. ,Ltd, Beijing 101100 ,China)
出处
《岩土工程技术》
2017年第5期268-270,F0003,共4页
Geotechnical Engineering Technique
关键词
盾构施工
群桩基础
钢花管注浆
shield tunnel
pile foundation
steel pipe grouting
