利用液态DME-TTFP对盾构渣土绿色高效脱水研究  

Green and Efficient Dehydration of Shield Muck Using Liquid Dimethyl Ether and Triguaiacyl Phosphite

作　　者：张庆芸 赵阳[1] 张迪[2] 陈俊伟[2] 陆加越 张英杰 ZHANG Qingyun;ZHAO Yang;ZHANG Di;CHEN Junwei;LU Jiayue;ZHANG Yingjie(Jiangsu Province Transportation Engineering Construction Bureau,Nanjing 210004,Jiangsu,China;China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,Hubei,China;State Key Laboratory of High Performance Civil Engineering Materials,Nanjing 210008,Jiangsu,China;Jiangsu Sobute New Materials Co.,Ltd.,Nanjing 211103,Jiangsu,China)

机构地区：[1]江苏省交通工程建设局,江苏南京210004 [2]中铁第四勘察设计院集团有限公司,湖北武汉430063 [3]高性能土木工程材料国家重点实验室,江苏南京210008 [4]江苏苏博特新材料股份有限公司,江苏南京211103

出　　处：《隧道建设（中英文）》2023年第S02期178-185,共8页Tunnel Construction

基　　金：国家自然科学基金青年基金项目(52108218)。

摘　　要：针对盾构渣土脱水过程中处理时间长、脱水效率较低和药剂环境污染等问题,使用液态二甲醚与三亚磷酸酯复合材料(DME-TTFP),通过相变法对盾构渣土进行脱水,探究不同DME-TTFP掺入量和反应时间对盾构渣土脱水效果的影响规律。通过X射线衍射法(XRD)、X射线荧光光谱法(XRF)、扫描电镜(SEM)、比表面积分析(BET)等方法表征盾构渣土脱水前后的物质组成、粒径分布及颗粒形貌,并对盾构渣土在脱水过程中的水分形态变化进行分析。结果表明:1)DME-TTFP掺入量和处理时间显著影响盾构渣土的脱水效果,盾构渣土的含水率随着液态DME-TTFP投加量和反应时间的增加而降低;2)将液态DME-TTFP与渣土中水分的质量比控制为8,脱水时间控制为15~20 min,可将渣土的含水率稳定在23%左右,达到最高效的脱水状态;3)脱水前后渣土粒径分布较为稳定,DME-TTFP不会残留在渣土中,对渣土的成分组成影响较小,具有较强的可重复利用性;4)在脱水过程中,前期自由水会优先脱离,反应中后期部分结合水会逐渐脱离,结合水脱除率可达35%以上。The shield muck dehydration has disadvantages such as long processing time,low efficiency,and environmental pollution caused by chemicals.Therefore,a novel material composed of liquid dimethyl ether and triguaiacyl phosphite(DME-TTFP)is developed to dehydrate shield muck using phase change method,and the influence of different DME-TTFP amount and reaction time on dehydration effect is examined.The composition,particle size distribution,and morphology of shield muck before and after dehydration are characterized by X-ray diffraction,X-ray fluorescence spectroscopy,scanning electron microscopy,and specific surface area analysis,respectively,and the moisture morphological variations of the shield muck during dehydration process is analyzed.The results demonstrate the following:(1)The amount of DME-TTFP incorporation and treatment time considerably affect the dehydration of shield muck.The moisture content decreases with increasing amount of liquid DME-TTFP incorporation and treatment time.(2)The moisture content of the muck can be stabilized at approximately 23%when the mass ratio of liquid DMETTFP to moisture in the muck is set at 8 with a dehydration time of 15-20 min,resulting in an optimal dehydration state.(3)The particle size distribution of the muck after dehydration is relatively constant,and DME-TTFP cannot be found in muck,which exhibits favorable reusability and weak contribution to the composition of the shield muck.(4)The free water would preferentially be detached during early stage of dehydration,and almost completely disengaged in the middle and later stages.Then partial bound water could be gradually detached,and the removal efficiency of bound water attained more than 35%.

关 键 词：隧道 盾构 渣土脱水 相变 清洁生产 

分 类 号：U45[建筑科学—桥梁与隧道工程]