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吴鸿昇¹  ,  刘    勇¹  ,  蔡辉敏¹  ,  李    斌¹  ,  李方林¹  ,  吴跃东²  ,  刘    坚²

 

( 1 .  国网江苏省电力工程咨询有限公司，江苏 南京 210036 ;

2.  河海大学 岩土力学与堤坝工程教育部重点实验室，江苏 南京 210098)

摘   要 ：现有疏浚淤泥化学固化的处理方法是在淤泥中先添加吸水剂再使用固化剂。该方法虽然减少了固化剂的用量，但是在制备固化土时固化剂难以拌和，进而影响固化效果，且减缓工程进度，不利于工程应用。 为此，提出先固化后吸水的淤泥固化处理方法，并通过滴定试验、无侧限抗压强度试验和压汞试验，对比分析先吸水后固化和先固化后吸水这两种处理方法的固化效果和机理。结果表明： 相较于先吸水后固化，先固化后吸水处理方法所制备的固化土Ca2 + 含量更大，无侧限抗压强度更高，表明该方法的固化效果更好。这是因为先  固化后吸水的处理方法所制备固化土小孔径的孔隙含量更大，土体结构更加紧密。该研究为淤泥固化土的工程制备提供了新思路和技术参考。

关键词：淤泥固化土 ；固化方法 ；无侧限抗压强度 ；微观试验

中图分类号：TU43            

文献标志码：A           

文章编号： 1005- 8249   (2024)  06- 0073- 06 

DOI:10. 19860/j.cnki.issn1005 - 8249.2024.06.014

 

WU Hongsheng¹  ,  LIU Yong¹  ,  CAI Huimin¹  ,  LI Bin¹  ,  LI Fanglin¹  ,  WU Yuedong² ,  LIU Jian²    

 (1 . State Grid Jiangsu Electric Power Engineering Consulting Co. ，Ltd. ，Nanjing 210036 ,  China;

2. Key Laboratory of Ministry of Education for Geomechanics and E mbankment Engineering ,

Hohai University ,  Nanjing 210098 ,  China)

Abstract: The existing treatment method for chemical solidification of dredged sludge is to first add water absorbent and then solidifying agent to the sludge. Although this method reduces the amount of solidifying agent used, the solidifying agent is difficult to mix when preparing the solidified soil. This behavior weakens the solidification effect and slows down the engineering progress, which is not conducive to engineering applications. Therefore, a sludge solidification treatment method that first solidifies soil and then absorbs water was proposed. By conducting titration tests, unconfined compressive strength tests and mercury intrusion tests, the solidification effects and mechanisms of the two treatment methods, viz first water absorbent and then solidifying agent, first solidifying agent and then water absorbent, were compared and analyzed. The experimental results show that, compared with that of the method of first water absorbent and then solidifying agent, the solidified sludge soil with a higher Ca2+ content and unconfined compressive strength. The method of first solidifying agent and then water absorbent produces solidified soil with a larger pore content in small pore size, indicating a much denser soil structure. A new idea and technical references for the engineering preparation of solidified sludge soil can be provided. 

Keywords :  solidified sludge soil;  solidification method;  unconfined  compressive strength;  microcosmic experiment

作者简介：吴鸿昇  (1989—) ,  男 ，硕士 ，工程师 ，研究方向：岩土工程与结构工程。

通信作者：吴跃东  (1969—) ,  男 ，博士 ，教授 ，研究方向：基础工程与地基处理。

收稿日期：2023- 03- 05