基于HSS模型的流态固化土基槽回填工程全过程数值分析与现场试验  

Numerical Analysis and Field Test of the Whole Process of Soil-based CLSM Trench Backfill Project Based on HSS Model

作　　者：王明 刘振忠 侯艳斌 刘喆 薛泽 叶梓 WANG Ming;LIU Zhenzhong;HOU Yanbin;LIU Zhe;XUE Ze;Ye Zi(Shenzhen Comprehensive Transportation and Municipal Engineering Design and Research Institute Co.Ltd.,Shenzhen 518000,Guangdong China;Shanghai Pudong Luqiao(Group)Co.Ltd.,Shanghai 201206,China;Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210098,China;Suzhou Research Institute of Hohai University,Suzhou 215100,Jiangsu China)

机构地区：[1]深圳市综合交通与市政工程设计研究总院有限公司,广东深圳518000 [2]上海浦东路桥(集团)有限公司,上海201206 [3]河海大学岩土力学与堤坝工程教育部重点实验室,南京210098 [4]河海大学苏州研究院,江苏苏州215100

出　　处：《河南科学》2025年第2期257-266,共10页Henan Science

基　　金：国家自然科学基金项目(52308348)。

摘　　要：流态固化土回填由于其自密实、自流平、自硬化的优势,近年来在基坑、管廊肥槽、桥涵台背等回填工程中得到广泛应用,具备替代传统碾压夯实回填材料的潜力。本文依托宁波西洪大桥某管廊基坑回填工程,采用Plaxis3D数值分析软件对流态固化土的应用评价研究。基于土体的HSS模型,精细化模拟管廊基坑施工、管廊施工、沟槽回填、支撑拆除和道路施工的全过程。分析不同回填土(流态固化土和黏土)下路基的变形特性,验证了流态固化土回填沟槽的适用性。开展不同流态固化土龄期情况及上部荷载情况下的土体变形分析,获得流态固化土回填的优化方案。研究发现,数值分析与现场沉降监测结果误差相对较小,基于HSS模型的流态固化土基槽回填工程的数值分析具备良好的准确性与可靠性。路堤荷载引起的路基沉降随流态固化土养护龄期的增加而逐步降低。养护龄期从3 d增加到14 d后,路基中心处的最大沉降降低了26.1%;继续增加养护龄期到28 d后,路基中心线处土体沉降降幅仅为2.5%。采用流态固化土基槽回填工程有助于控制基坑及上部构筑物沉降。Due to its self-compacting,self-leveling,and self-hardening properties,soil-based controlled lowstrength material(CLSM)backfill has gained traction in various backfill projects like foundation pits,pipe corridors,and bridge abutments.It has the potential to replace traditional roller compacted backfill materials.This study focuses on the backfilling of a pipe gallery foundation pit at Ningbo Xihong Bridge,employing Plaxis 3D software to assess soil-based CLSM application.Using the HSS model to define soils,it simulates the entire construction process,including trench backfilling and road construction,with detailed precision.Deformation analysis of the roadbed under different backfill soils(soil-based CLSM and clay)validates the suitability of soilbased CLSM backfill.Additionally,soil deformation analysis under varying soil ages and upper load conditions aims to optimize the soil-based CLSM backfill solution.The study reveals a minimal error between numerical analysis and in-situ settlement results,demonstrating the accuracy and reliability of the HSS model-based numerical analysis.Subgrade settlement due to embankment loads decreases progressively with longer curing times of the soilbased CLSM.Increasing the curing age from 3 to 14 days reduces maximum settlement at the roadbed center by 26.1%.Further increasing the curing age to 28 days results in a marginal 2.5%decrease in settlement at the roadbed centerline.Implementing soil-based CLSM foundation trench backfill engineering effectively controls settlement in foundation pits and upper structures.

关 键 词：流态固化土 HSS模型 全过程分析 Plaxis数值模拟 现场试验 

分 类 号：TU473[建筑科学—结构工程]