Research on utility tunnel foundation treated by compaction piles 
and post-work immersion test in self-weight collapsible 
loess area with large thickness

ZHU Yan-peng; DU Xiao-qi; YANG Xiao-hui; LI Hui-jun

doi:10.16285/j.rsm.2018.0112

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Research on utility tunnel foundation treated by compaction piles and post-work immersion test in self-weight collapsible loess area with large thickness

更新时间：2026-06-25

- Research on utility tunnel foundation treated by compaction piles and post-work immersion test in self-weight collapsible loess area with large thickness
- Vol. 40, Issue 8, Pages: 2914-2924(2019)
- 作者机构：
  
  1. 兰州理工大学土木工程学院,甘肃,兰州,730050
  2. 兰州理工大学西部土木工程防灾减灾教育部工程研究中心,甘肃,兰州,730050
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2018.0112
  CLC： TU444
- Online First：24 August 2019，
  
  Published：2019
- 稿件说明：
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ZHU Yan-peng, DU Xiao-qi, YANG Xiao-hui, et al. Research on utility tunnel foundation treated by compaction piles and post-work immersion test in self-weight collapsible loess area with large thickness[J]. 2019, 40(8): 2914-2924.
DOI：

ZHU Yan-peng, DU Xiao-qi, YANG Xiao-hui, et al. Research on utility tunnel foundation treated by compaction piles and post-work immersion test in self-weight collapsible loess area with large thickness[J]. 2019, 40(8): 2914-2924. DOI： 10.16285/j.rsm.2018.0112.

摘要

确定了挤密桩处理大厚度自重湿陷性黄土地区综合管廊地基的合理处理范围，揭示了挤密桩处理地基效果随地基处理深度的变化规律，研究了挤密桩复合地基在地基浸水后的入渗规律及沉降特征。在大厚度湿陷性黄土场地进行不同深度的灰（素）土挤密桩地基处理试验及埋设TDR水分计和分层沉降仪的工后浸水试验。研究结果表明，随着地基处理深度的增大，各试验区挤密桩复合地基桩间土挤密效果呈增强趋势；挤密桩复合地基桩间土的干密度增长率随地基处理深度的增大而增大；挤密桩复合地基的抗渗性能随地基处理深度的增大而增强；外界水分在挤密桩复合地基中的入渗规律呈现出明显的阶段性，基本由4个阶段组成；挤密桩复合地基桩间土受水浸湿时的沉降变形，随地基处理深度的增大而减小，且呈现出明显的阶段性，基本由5个阶段组成。根据研究结果，在采取有效的防水措施的情况下建议地基处理深度为9～12 m，处理宽度为管廊每边延伸控制在2 m，作为大厚度自重湿陷性黄土地区综合管廊的合理地基处理范围。

Abstract

This study determined the reasonable treatment range of utility tunnel foundation in self-weight collapsible loess with large thickness. Meanwhile

the regularity of the compacting effect on the foundation was revealed with various treatment depths

and the infiltration law and settlement characteristics of composite foundation after immersion were analyzed. With different depths of lime soil (pure soil) compaction piles

the foundation treatment experiments were conducted on the collapsible loess with large thickness. Moreover

post-work immersion tests were carried out by embedding TDR moisture meter and layered settlement instrument. The results show that with increasing the treatment depth of composite foundation

the impermeability of composite foundation

compacting effect and dry density of soil between piles all increase. The external water presents distinct multistage infiltration in composite foundation

including four stages basically. The deformation of wetting soil between piles decreases with the increase of the foundation treatment depth. Besides

it shows obvious five stages. According to the research results

under the condition of effective waterproof measures

the reasonable treatment range is summarized as follows: the treatment depth should be controlled in the range of 9-12 m

and the treatment width should be controlled within 2 m extended from each side of tunnel.

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