地下工程渣土的再生固化土力学性能试验研究  

The mechanical properties of recycled solidified soil from underground construction spoils

作　　者：杨涛 闫美美 刘帅磊 李幸孺 王梦谣 YANG Tao;YAN Meimei;LIU Shuailei;LI Xingru;WANG Mengyao(School of Urban Planning and Municipal Engineering,Xi’an Polytechnic University,Xi’an 710048,Shaanxi Province,P.R.China)

机构地区：[1]西安工程大学城市规划与市政工程学院,陕西西安710048

出　　处：《深圳大学学报（理工版）》2023年第5期578-587,共10页Journal of Shenzhen University(Science and Engineering)

基　　金：陕西省重点研发计划资助项目(2023-YBSF-516);西安工程大学研究生创新基金资助项目(chx2023032)。

摘　　要：针对地下工程作业过程中产生的大量地下余泥渣土处理难、易污染等问题,选取地下工程余泥渣土配制复合材料再生固化土(recycled solidified soil,RSS),通过室内配合比、坍落扩展度、无侧限抗压强度和X射线衍射等试验,对不同养护方式、水固比(水与风干渣土和胶凝材料的总质量比)、水泥质量分数、矿物掺和料下再生固化土的基本性能和再生固化机理进行研究.结果表明,水固比为0.35时,RSS的流动性可满足一般回填工程的要求;不同养护条件下,RSS的无侧限抗压强度均随养护龄期、水泥质量分数的增加和水固比的减小而增大,且水下养护强度小于室内养护;再生固化土强度的建立主要由水化反应生成的水化产物与土颗粒之间的胶结来实现.研究成果可为工程渣土的处理和资源化利用提供借鉴.To address the challenges of managing and mitigating the environmental impact posed by the large amount of underground residual soil generated during underground construction,a composite material known as recycled solidified soil(RSS)was developed using this underground construction residual soil.Through a series of laboratory tests,including mix design,slump spread,unconfined compressive strength,and X-ray diffraction,the basic properties and regenerative curing mechanism of RSS were investigated under various curing conditions,water-to-solid ratios(the total mass ratio of water to air-dried residual soil and cementitious material),cement mass fractions and mineral admixtures.The results show that the fluidity of the RSS can meet the requirements of general backfilling projects at a water-to-solid ratio of 0.35.The unconfined compressive strength of the RSS increases with curing time,higher cement mass fractions and water-to-solid ratios under different curing conditions,with lower strength of underwater curing compared to indoor curing.The establishment of strength in the RSS is primarily attributed to the cementation between hydration products and soil particles.The findings of this study offer valuable insights into the treatment and resource utilization of engineering residues and serve as a reference for addressing these challenges.

关 键 词：复合材料 再生固化土 工程渣土 水固比 流动性 无侧限抗压强度 

分 类 号：TU521.3[建筑科学—建筑技术科学]