摘要
海底淤泥具有特殊的土性特点,比如含水率高、强度低、有机质含量高、含盐量高等。随着工程建设向海洋进军,海底淤泥固化越来越受到人们关注。GS固化剂是一种以工业固废为主要原料的绿色固化材料,常被用于软土的加固处理当中。本文以香港某海底淤泥地基处理工程的海底淤泥为加固对象,研究GS固化剂加固海底淤泥时的力学特性及微观机理。对比分析了GS固化剂和水泥的掺量、龄期对固化土无侧限抗压强度的影响。同时,借助背散射电子显微镜获得固化土的背散射电镜(BES)图像,通过物象识别分析得到灰度直方图,对固化剂的固化机理进行讨论分析。研究结果表明,GS固化土表现为应变软化规律,无侧限抗压强度随龄期增加,增长速率逐渐减小。相比于普通水泥,GS固化土的早期强度更高、强度增长更快,强度提高比在2.03~2.81。GS固化土E与q的关系与水泥土基本一致。与水泥土相比,GS固化土的水化产物含量明显更高,水化程度好,孔隙含量相对较低,结构更加稳定。
Submarine silt has special soil characteristics,such as high water content,low strength,high organic matter content and high salt content.With the ocean engineering construction,the solidification of submarine silt has attracted attention.GS curing agent is a kind of green curing material with industrial solid waste as the main raw material,which is often used in the reinforcement of soft soil.In this paper,the mechanical properties and microscopic mechanism of submarine silt stabilized by GS curing agent were studied by taking the sea-bed silt of a sea-bed silt foundation treatment project in Hong Kong as the reinforcement object.The effects of the content of GS curing agent,cement and age on the unconfined compressive strength of solidified soil were compared and analyzed.Similiarly,the backscatter electron microscopy(BES)test was conducted to analyze the object image recognition and microscopic mechanism through the obtained gray histogram.The results show that GS solidified soil demonstrates a strain-softening behavior,the unconfined compressive strength increases with curing age,and the growth rate decreases gradually.Compared with common cement,GS solidified soil provides higher early strength and faster strength growth,with a strength improvement ratio of 2.03 to 2.81.The relationship between GS solidified soil Eand qis basically consistent with that of cement soil.Compared with cement soil,GS solidified soil has significantly higher hydration product content,better hydration degree,lower pore content and more stable structure.
作者
张振
李光耀
叶观宝
单卫良
舒欢
ZHANG Zhen;LI Guang-yao;YE Guan-bao;SHAN Wei-liang;SHU Huan(Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;Shanghai Baofen Material Technology Co.,Ltd.,Shanghai 201908,China;Jinmao Jiangsu Anhui Enterprise Management(Tianjin)Co.,Ltd.,Nanjing 320100,Jiangsu,China)
出处
《地基处理》
2022年第S01期1-5,共5页
Journal of Ground Improvement
基金
上海市科技计划项目(22ZR1466600)
国家自然科学基金资助项目(41972272,41772281)
关键词
GS固化剂
海底淤泥
无侧限抗压强度
工业固废
土体固化
GS curing agent
submarine silt
unconfined compressive strength
industrial solid waste
soil solidification
