预拌流态固化土强度特征及其模型研究  

Study on strength characteristics and models of ready-mixed fluidized solidified soil

作　　者：刘丽娜 高文生 徐彤[3] 王光亮[3] Liu Lina;Gao Wensheng;Xu Tong;Wang Guangliang(Institute of Foundation Engineering,China Academy of Building Research,Beijing 100013,China;CABR Foundation Engineering Co.Ltd,Beijing 100013,China;Beijing Puissant Geotechnical Engineering Co.Ltd,Beijing 102218,China)

机构地区：[1]中国建筑科学研究院有限公司地基基础研究所,北京100013 [2]建研地基基础工程有限责任公司,北京100013 [3]北京波森特岩土工程有限公司,北京102218

出　　处：《建筑科学》2023年第9期98-103,共6页Building Science

摘　　要：为积极响应国家"双碳"战略目标,本文以建筑固体废弃物的资源化利用为研究背景,通过系统的试验和理论分析,揭示预拌流态固化土的强度特征.结果表明,随着掺入比和养护龄期的增加,固化土无侧限抗压强度呈现出逐渐增大的规律.8%掺量的预拌流态固化土,当养护龄期达到28d时,无侧限抗压强度接近1.0MPa.固化剂掺入比越大、养护龄期越长的固化土多表现为脆性破坏的特征.预拌流态固化土应力-应变曲线本构关系具有与混凝土应力-应变曲线本构关系相类似的特点.建立的考虑不同掺入比的预拌流态固化土强度发展预测模型类似于双曲线函数形式.经验证,该模型能较为准确地预测多种固化土强度.本文所取得的成果对建筑结构的安全性与回填材料的低碳经济性的实现具有一定的参考意义.To respond to the national carbon peak and neutrality strategic goals,based on the resource utilization of construction solid waste,this study aims to reveal the strength characteristics and solidification mechanism of ready-mixed fluidized solidified soil through systematic tests and theoretical analysis.The results show that the unconfined compressive strength of the solidified soil increases gradually with the increase of the mixing ratio and the curing age.When the curing age reaches 28 days,the unconfined compressive strength of the 8%content of solidified soil is close to 1.OMPa.The solidified soil with the higher mixing ratio and longer the curing age usually has the more brittle failure characteristics.The stress-strain curve constitutive relationship of ready-mixed fluidized solidified soil is similar to that of concrete.The prediction model of the strength development of the ready-mixed flow solidified soil considering different mixing ratios is similar to the hyperbolic function form.It is proved that the model can accurately predict the strength of various solidified soil.The results obtained in this study have specific reference significance for the realization of the safety of building structures and low-carbon economy of backfill materials.

关 键 词：预拌流态固化土 无侧限抗压强度 本构关系 预测模型 

分 类 号：TU411.5[建筑科学—岩土工程]