摘要
随着中国河道清淤疏浚工程的开展,产生了大量疏浚淤泥,淤泥的处理处置逐渐引起了人们的高度重视,采用固化技术处理是解决疏浚淤泥困扰的有效方式之一。以浙江北白荡的疏浚淤泥为研究对象,通过X射线衍射(X-ray diffraction,XRD)分析固化产物,并利用X射线断层扫描成像技术(X-ray computed tomography,X-CT)、压汞(mercury injection porosimetry,MIP)试验等手段,对淤泥固化土的孔隙率和孔隙结构进行定量分析,同时探索其在浸水条件与干湿循环条件下的力学变化规律和固化机理。研究表明:固化土中方解石含量随着固化剂掺量的增加而增加,普通砂掺量的增加,提升了土体内部中小孔隙率,但总体孔隙率呈降低的趋势;水稳性试验结果显示,固化淤泥土强度和稳定性随着固化剂含量增加都得到了明显提高,随砂掺量增加呈现先增大后减小趋势。
With the implementation of river dredging projects in China,a large amount of dredged silt has been generated.The treatment and disposal of silt have gradually attracted great attention.Using solidification technology is one of the effective ways to solve the problems caused by dredged silt.Taking the dredged silt from Beibaidang in Zhejiang as the research object,the solidified products were analyzed through X-ray diffraction(XRD),and the porosity and pore structure of the solidified silt soil were quantitatively analyzed by means of X-ray computed tomography(X-CT)and mercury intrusion porosimetry(MIP)tests.Meanwhile,it explores the mechanical variation laws and solidification mechanism of the soil under soaking and dry-wet cycling conditions.The research shows that the calcite content in the solidified soil increases with the increase of the solidifying agent dosage.The increase of ordinary sand dosage improves the small and medium-sized porosity inside the soil,but the overall porosity shows a decreasing trend.The results of water stability tests indicate that the strength and stability of the solidified silt soil are significantly improved with the increase of the solidifying agent content,and they first increase and then decrease with the increase of sand dosage.
作者
路维
李飞
王金安
史燕南
LU Wei;LI Fei;WANG Jin-an;SHI Yan-nan(Tianjin College,University of Science and Technology Beijing,Tianjin 301830,China;School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;State Key Lab of Education Ministry for High Efficient Mining and Safety of Metal Mines,University of Science and Technology Beijing,Beijing 100083,China;Zhejiang Institute of Hydraulics&Estuary,Hangzhou 310020,China;Zhejiang Provincial Key Laboratory of Water Conservancy Disaster Prevention and Mitigation,Hangzhou 310020,China)
出处
《科学技术与工程》
北大核心
2025年第21期9052-9060,共9页
Science Technology and Engineering
基金
国家重点研发计划(2022YFB2602605)
天津市教委科研计划(2024KJ126)。
关键词
淤泥
固化土
孔隙率
水稳性
silt
solidified soil
porosity
water stability
