摘要
自密实水泥土回填技术是一项将城市弃土和固化剂拌和后形成的自密实水泥土用于回填的新型工程技术,由于自密实水泥土在固结前具有较好的流动性,固化后具有较高的密实度、强度和抗变形能力,因此该技术可以更好地控制回填质量.以苏州市某市政隧道基坑工程为例,对以现场开挖弃土为原料土的自密实水泥土进行室内配比试验,根据无侧限抗压强度的力学性质指标,利用PLAXIS软件对自密实水泥土基坑回填过程进行数值计算,着重分析基坑换撑及自密实水泥土回填过程中支护体系的变形及对周边环境的影响.结果表明:以工程弃土为原料土的自密实水泥土具有较高的强度和抗变形能力,能有效控制基坑变形,对周边环境影响小,可在降低工程造价的同时可实现城市弃土弃渣的资源化利用.
Self-compacting cemented soil backfilling technology is a new type of engineering technology which mixes urban waste soil and residue and curing agent for backfilling. The technology can control the backfilling quality better because self-compacting cemented soil has better fluidity before solidification and has high compactness,strength and anti-deformation ability after curing. Taking the foundation pit project of a municipal tunnel in Suzhou as an example,proportion test of self-compacting cemented soil with urban waste soil and residue as raw materials is carried out. These mechanical properties conducted by unconfined compression strength tests will mainly be used to analyze the deformation of the supporting system and its influence on the surrounding environment in the process of foundation support replacement and self-compacted cemented soil backfilling using PLAXIS software. The results show that the self-compacting cemented soil using urban waste soil and residue has high strength and deformation resistance that can effectively control the deformation of the foundation pit with little influence on the environment. This technology therefore can improve the quality of backfilling of deep foundation pit and realize the resource utilization of urban discarded dregs with lower project cost.
作者
张燚
严柏杨
亓永帅
高玉峰
ZHANG Yi;YAN Boyang;QI Yongshuai;GAO Yufeng(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210098,China;College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China)
出处
《河南科学》
2021年第1期98-104,共7页
Henan Science
基金
国家自然科学基金(50899511)。
关键词
弃土弃渣
资源化利用
自密实水泥土
换撑
基坑回填
变形
waste soil and residue
resource utilization
self-compacting cemented soil
support replacement
foundation pit backfill
deformation
