盾构近距离穿越群桩旋喷加固效果分析

寇晓强; 杨京方; 叶国良; 曹永华

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铁道工程学报 ›› 2011, Vol. 28 ›› Issue (11) : 98-103.

路网研究

盾构近距离穿越群桩旋喷加固效果分析

寇晓强，杨京方，叶国良，曹永华

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Study on Reinforcement Effect of Shield Tunnel Adjacent to Existing Pile Foundation with Churning Pile

KOU Xiao － qiang，YANG Jing － fang，YE Guo － liang，CAO Yong － hua

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文章历史 +

摘要

研究目的：在关键部位采用旋喷加固法减小盾构近接穿越过程中对已建构筑物的影响，是工程界较为普遍的施工保护措施。具体施工过程中加固效果如何，加固对已有构筑物应力及变形影响机理如何以及穿越过程中构筑物变形发生、发展规律是怎样的，均值得深入细致研究。

研究结论:通过采用有限元法对盾构开挖近距离穿越群桩过程的模拟，并与实测数据进行对比，得到: 在盾构穿越桩基过程中，桩体的变形主要体现在上浮及侧向弯曲上; 在未采用旋喷加固体的开挖过程中，计算与实测得到的桩体的最大上浮量均约为2 mm，而侧向变形最大约5． 7 mm; 对比分析采用旋喷加固对桩基变形影响效果，得到旋喷加固可有效减小盾构穿越过程中桩基的侧向变形，其中加固后1 号桩体减小侧向变形达28． 5%，2 号桩体减小侧向变形达42． 2%。

Abstract

Research purposes: The churning pile is commonly used for the key parts to reduce the influence of the shield construction on the adjacent building． Therefore，it is necessary to do the research on the reinforcement effect during the construction，the influences of the reinforcement on the stress and deformation of the existing building and the occurrence and development laws of the deformation of the building during the shield tunnel under － passing the exiting building．

Research conclusions: From the simulation of the process of the shield tunneling through the adjacent piles with the ANSYS and the comparison of the simulation result with the in － situ measured results，it was revealed that the main deformation of the piles was up floating and lateral banding． In the process of the excavation of the non － reinforced body by the churning pile，the maximum calculated and measured up floating value was 2 mm while the maximum lateral deformation volume was 5． 7 mm． From the analysis of the influence of the reinforcement by the churning pile on the deformation of the pile foundation，it was concluded the reinforcement by the churning pile could effectively cut the lateral deformation of the pile foundation during shield tunnelling． Concretely speaking，after reinforcement by the churning pile，the lateral deformation of No． 1 pile body was cut by 28． 5% and the lateral deformation of No． 2 pile body was cut by 42． 2%．

导出引用

寇晓强, 杨京方, 叶国良, 等. 盾构近距离穿越群桩旋喷加固效果分析[J]. 铁道工程学报, 2011, 28(11): 98-103

KOU Xiao － qiang, YANG Jing － fang, YE Guo － liang, et al. Study on Reinforcement Effect of Shield Tunnel Adjacent to Existing Pile Foundation with Churning Pile[J]. Journal of Railway Engineering Society, 2011, 28(11): 98-103

中图分类号： U455． 43

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