PDF全文阅读

杨   涛¹ , 覃辉凤² , 殷晓三³ , 黄剑新⁴

 

( 1. 广西物流职业技术学院 , 贵港   537100 ;  2.  广西北投交通养护科技集团有限公司 ,  南宁   530000  ;

3.  中原工学院 ,  郑州   451197 ;  4.  广西地矿建设集团有限公司 ,  南宁   530000)

摘  要 :  为解决深基坑回填中固化土材料配比缺乏量化依据 、狭小空间施工扰动难以有效控制及过程质量缺少在线反馈等问题 , 构建固化土回填施工质量控制技术体系 。采用室内试验与现场验证相结合的方法 : 制备不同配合比固化土试件 , 开展 3 、7 、28 d 无侧限抗压强度试验确定工程适用配比 ; 研发分层回填防扰动限位装置 , 并在施工过程中对含水率 、密实度与地基应力进行连续监测 , 根据监测结果实施工艺参数与装置位置的动态调整 , 形成“ 材料精准制备—受控施工—监测反馈 ” 的闭环控制流程 。结果表明 : 推荐配比条件下固化回填体 28 d 抗压强度达到 2. 75 MPa; 在 90 d 跟踪监测中 ,  回填至 6. 0 m 且变形趋于稳定阶段的累计沉降控制在 4. 0 mm , 较常规回填方式表现出更优的沉降收敛特征 。研究表明 , 该闭环控制体系能够提升深基坑回填过程的可控性与稳定性 , 为深基坑回填工程质量控制提供可操作的技术路径。

关键词 :  固化土 ; 深基坑回填 ; 质量控制 ; 扰动控制 ; 工后沉降

中图分类号 : TU753           文献标志码 : A           文章编号 :  1005- 8249  (2026)  03-0127-07

DOI :10. 19860/j. cnki. issn1005- 8249. 2026. 03. 021

 

YANG Tao¹ , QIN Huifeng² , YIN Xiaosan³ , HUANG Jianxin⁴

(  1. Guangxi Logistics Vocational and Technical College , Guigang 537100 , China  ;

2. Guangxi Beitou Transportation Maintenance Technology Group Co. , Ltd. , Nanning 530000 , China;

3. Zhongyuan Institute of Technology , Zhengzhou 451197 , China;

4. Guangxi Geological and Mineral Construction Group Co. Ltd. , Nanning 530000 ,  China)

Abstract :  To address the lack of quantitative guidance for mix proportioning , the difficulty in controlling construction-induced disturbance in confined spaces , and the absence of online feedback during deep foundation pit backfilling with solidified soil , a quality - control  technology   system  was  established.    Laboratory  tests  and field  verification were  combined.    Solidified - soil specimens with various mix proportions were prepared , and unconfined compressive strength tests at curing ages of 3 d , 7 d , and  28 d  were  performed  to determine an engineering - applicable proportion.    An anti - disturbance limiting device for layered backfilling was  developed ,  and  continuous  monitoring  of moisture   content ,  compaction   density ,  and  foundation   stress  was implemented during  construction.   Process parameters and device positions were adjusted according to monitoring feedback , thereby forming a closed-loop workflow integrating precise material preparation , controlled construction , and monitoring-based  regulation.   The   results  show  that  the  28  d  unconfined  compressive  strength  reached  2. 75  MPa  under  the  recommended proportion.   During  a 90 d monitoring period , the cumulative settlement was controlled to 4. 0 mm at the stage when the backfill depth reached 6. 0 m and  deformation tended to  stabilize , and a more favorable  settlement  convergence behavior was observed compared with conventional backfilling approaches.   The  proposed  closed-loop  control  system  improves  the  controllability  and stability of deep foundation pit backfilling and provides an implementable technical route for construction quality management.

Key words :  solidified soil; deep foundation pit backfilling; quality control; disturbance control; post-construction settlement