侵蚀方式和环境对固化软土力学性质的影响  

Effects of erosion method and environment on mechanical properties of solidified soft soil

作　　者：何俊 龙思昊[1] 朱元军 罗时茹 HE Jun;LONG Sihao;ZHU Yuanjun;LUO Shiru(School of Civil Engineering,Architectural and Environment,Hubei University of Technology,Wuhan 430068,China;Key Laboratory of Health Intelligent Perception and Ecological Restoration of River and Lake,Ministry of Education,Hubei University of Technology,Wuhan 430068,China)

机构地区：[1]湖北工业大学土木建筑与环境学院,湖北武汉430068 [2]湖北工业大学河湖健康智慧感知与生态修复教育部重点实验室,湖北武汉430068

出　　处：《浙江大学学报（工学版）》2024年第9期1857-1865,共9页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(41772332).

摘　　要：以碱渣(SR)-矿渣(GGBS)-电石渣(CS)和水泥为海相软土固化剂,设置Na_(2)SO_(4)、MgSO_(4)和海水3种侵蚀溶液环境,溶液全浸泡、溶液半浸泡和土中侵蚀3种侵蚀方式.开展固化软土无侧限抗压强度试验、X射线衍射及扫描电镜测试,研究固化剂种类、侵蚀方式和环境对固化软土抗侵蚀性能的影响.研究表明:当侵蚀方式和环境相同时,碱渣-矿渣-电石渣固化软土完整程度和强度大于水泥固化软土的.MgSO_(4)溶液环境下固化软土破损严重,强度最低.当侵蚀环境相同时,水泥固化软土完整程度和强度均为半浸泡下的优于全浸泡下的;碱渣-矿渣-电石渣固化软土在半浸泡时外观较完整,但强度却低于全浸泡方式下的.在土中侵蚀时固化软土强度较高.水泥固化软土在浸泡区会生成大量碳硫硅钙石,故其在全浸泡时强度最低;碱渣-矿渣-电石渣固化软土在未浸泡区会有较多碳硫硅钙石和盐结晶,造成其半浸泡后强度最低,半浸泡成为其最危险的侵蚀方式.Soda residue(SR)-ground granulated blast furnace slag(GGBS)-carbide slag(CS)and cement were used as solidifiers of soft soil.Different erosion environments(Na_(2)SO_(4),MgSO_(4) and seawater)and erosion modes(full immersion,semi-immersion and soil erosion)were set up.Unconfined compressive strength,X-ray diffraction and scanning electron microscope tests were carried out to study the effects of solidifier,erosion mode and environment on the erosion resistance of the solidified soft soil.Results showed that,under the same erosion mode and environment,the integrity and the strength of SR-GGBS-CS solidified soft soil were greater than those of cementsolidified soft soil.The samples in MgSO_(4) environment were seriously damaged and the strength values were the lowest.The integrity and the strength of cement-solidified soft soil in the semi-immersion mode were better than those in the full-immersion mode.Although the appearance of SR-GGBS-CS solidified soft soil was relatively complete in the semi-immersion mode,the strength in the semi-immersion mode was lower than that in the fullimmersion mode.The strength of solidified soft soil was high in soil erosion mode.A large amount of thaumasite was generated in the soaking area of cement-solidified soft soil,contributing to its lowest strength in the fullimmersion mode.As for SR-GGBS-CS solidified soft soil,more thaumasite generation and salt crystallization in the non-immersed zone resulted in the lowest strength in the semi-immersion mode.The semi-immersion became the most dangerous erosion mode for SR-GGBS-CS solidified soft soil.

关 键 词：固化软土 侵蚀方式 侵蚀环境 抗侵蚀耐久性 固体废弃物 

分 类 号：TU411[建筑科学—岩土工程]