摘要
为响应国家“双碳”发展目标,促进建筑业朝着低碳、节能、环保方向发展,拟采用地聚物替代水泥作为淤泥质土固化剂材料。为研究地聚物搅拌桩加固淤泥质软弱土地基的可行性,基于相似理论,对地聚物土无侧限抗压强度(UCS)、荷载沉降变形特征、桩土应力比及桩顶应力进行了分析。结果表明:当固化剂掺量相同时,地聚物固化土强度高于水泥固化土,碱含量为30%的地聚物固化土强度最高;地聚物搅拌桩能显著提高淤泥质软弱土地基的承载力和桩土应力比,碱含量对地聚物搅拌桩的承载力会产生一定的影响,30%碱含量时复合地基承载力最大,且桩土应力比最高。相关研究成果可为地聚物处治软弱土地基提供借鉴和参考。
In order to correspond to the national“dual carbon”development goal and promote the development of the construction industry in the direction of low carbon,energy saving and environmental protection,it is proposed to use geopolymers instead of cement as the adhesive material of mucky soil.In order to study the load-bearing deformation characteristics of mucky soil foundation strengthened by geopolymer mixing piles,based on similarity theory,the unconfined compressive strength(UCS)of geopolymer soil,load-settlement deformation characteristics,pile-soil stress ratio and pile top stress were analyzed.The results show that when the dosage of curing agent is the same,the strength of geopolymer solidified soil is higher than that of cement solidified soil,and the strength of geopolymer solidified soil with an alkali content of 30%is the highest.Geopolymer mixing piles can significantly improve the bearing capacity and pile-soil stress ratio of mucky soil foundations.At the same time,the alkali content will have a certain influence on the bearing capacity of the geopolymer mixing pile.When the alkali content is 30%,the bearing capacity of the composite foundation is the largest,and the pile-soil stress ratio is the highest.The relevant research results can provide a reference for the treatment of weak soil foundation with geopolymers.
作者
胡勇
王观次
王倩
HU Yong;WANG Guanci;WANG Qian(Yueyang City Roads and Bridges Construction Corporation Yueyang 414002,China;College of Civil Engineering and Mechanics,Xiangtan University Xiangtan 411105,China)
出处
《广东土木与建筑》
2022年第7期21-24,共4页
Guangdong Architecture Civil Engineering
基金
国家自然科学基金项目(51764009)
湖南省自然科学基金(2021JJ50039)。
关键词
淤泥质土
地聚物搅拌桩
承载变形特征
力学性能
桩土应力比
mucky soil
geopolymer mixing pile
load-bearing deformation characteristics
mechanical properties
pile-soil stress ratio
