深圳海积软土的矿物成分及结合水特征  

The material composition and binding water characteristics of marine soft soils in Shenzhen

作　　者：宋晶 方敬锐[1] 巩文腾 唐群艳 SONG Jing;FANG Jingrui;GONG Wenteng;TANG Qunyan(School of Earth Sciences and Engineering,Sun Yat-sen University,Guangzhou 510275,China;Guangdong Province Key Laboratory of Geodynamics and Geological Hazards/Guangdong Province Key Laboratory of Geological Processes and Mineral Resources/Guangdong Province Deep Earth Exploration and Geological Engineering Technology Research Center,Zhuhai 519082,China;CCCC Fourth Navigation Engineering Survey and Design Institute Co.,Ltd.,Guangzhou 510230,China)

机构地区：[1]中山大学地球科学与工程学院,广东珠海519082 [2]广东省地球动力作用与地质灾害重点实验室/广东省地质过程与矿产资源探查重点实验室/广东省深地探测与地质工程技术研究中心,广东珠海519082 [3]中交第四航务工程勘察设计院有限公司,广东广州510230

出　　处：《中山大学学报（自然科学版）（中英文）》2023年第1期57-63,共7页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家自然科学基金(41877228,41402239);广州市科技计划项目(201904010136)。

摘　　要：为探究深圳海积软土施工后地基沉降大、工程性质较差的原因,本文基于海积软土的基本物理力学性质,从微观角度入手,通过X射线衍射试验和同步热分析试验,定量分析海积软土的矿物成分及结合水特征。X射线衍射试验结果显示,深圳海积软土中矿物含量较多,约占22%,以蒙脱石为主要成分。同步热分析试验结果显示原状土结合水含量约占3%,细粒土样结合水含量约占3.5%且完全脱去结合水所需温度更高。结果说明黏土矿物含量高的软土往往具有含量更高的结合水,这也导致其工程性质较差。Marine soft soils in the Shenzhen area show large foundation settlement and poor engineering properties after construction. To investigate the mechanism,we quantitatively analyzed the mineral composition and bound water characteristics by using X-ray diffraction and thermogravimetric tests.The results show that the bound water content of the as-built clay is about 3%,while the bound water content of the fine-grained clay sample is about 3.5%;The temperature required to completely remove the bound water is higher when the bound water content is higher. It indicates that soft soils with high clay mineral content tend to have high bound water content,which also leads to poor engineering properties.

关 键 词：黏土矿物 X射线衍射 微观结构 同步热分析 

分 类 号：TU411[建筑科学—岩土工程]