大直径桥桩近接运营地铁施工扰动的分区控制
Disturbance Zone Control Method for a Large Diameter Bored Pile Construction Near an Operative Subway
黄顺佩 1王良俊 1朱尚明 2翟浪宝3
作者信息
- 1. 中国水利水电第七工程局有限公司,成都 611730
- 2. 中电建铁路建设投资集团有限公司,北京 100070
- 3. 武汉理工大学,武汉 430070
- 折叠
摘要
桥梁桩基近接既有地铁隧道是开拓城市地下空间时常遇到的问题,探讨桥桩施工对周围土层扰动规律是保证既有地铁隧道安全的重要一环.依据相应土层受扰规律提供更为安全和经济的施工工艺同样也是相关研究目的所在.依托福州某大直径超长桥桩近接地铁隧道施工工程,基于理论及数值分析结果,揭示了地层扰动传播随开挖深度的三阶段演化特征,并提出了一种"上部永久钢护筒微扰动贯入+下部泥浆护壁成孔组合的超长大直径桩快速施工方法".现场实测结果显示,该方法经济、安全,隧道扰动最终变形均在安全控制值内.
Abstract
The installation of bridge piles near existing subway tunnels is an inevitable result in the utilizing urban underground space.Quantifying the disturbance zone of the surrounding soil layers caused by the bridge pile installation is an important measure to ensure the safety of existing subway tunnels.Providing a safer and cost-effective construction process according to the corresponding soil disturbance has also the technical significance of related research.Therefore,by using the finite element software,the construction of a large-diameter and extra-long bored bridge pile near a subway tunnel in Fuzhou was numerically studied.From the theoretical and numerical analysis results,the three-stage evolution characteristics of the soil stratum dis-turbance propagation with the excavation depth were investigated and an"upper part"method was proposed.The rapid con-struction method for this extra-long and large diameter bored piles combined with the micro-disturbance penetration of perma-nent steel casing and the lower slurry retaining wall.The field measurement results of a large-diameter and extra-long bored bridge pile near the subway tunnel construction in Fuzhou show that the final deformation of the tunnel disturbance guided by this method is within the allowable safe value.The method is demonstrated to be economical and safe.
关键词
桩隧工程/盾构隧道/土体扰动/组合工艺Key words
Pile and Tunnel Engineering/Shielded Tunneling/Soil Disturbance/Combined Technology引用本文复制引用
出版年
2024
NETL
NSTL
万方数据