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吳鴻昇¹  ,  劉    勇¹  ,  蔡輝敏¹  ,  李    斌¹  ,  李方林¹  ,  吳躍東²  ,  劉    堅²

 

( 1 .  國網江蘇省電力工程咨詢有限公司，江蘇 南京 210036 ;

2.  河海大學 巖土力學與堤壩工程教育部重點實驗室，江蘇 南京 210098)

摘   要 ：現有疏浚淤泥化學固化的處理方法是在淤泥中先添加吸水劑再使用固化劑。該方法雖然減少了固化劑的用量，但是在制備固化土時固化劑難以拌和，進而影響固化效果，且減緩工程進度，不利于工程應用。 為此，提出先固化后吸水的淤泥固化處理方法，并通過滴定試驗、無側限抗壓強度試驗和壓汞試驗，對比分析先吸水后固化和先固化后吸水這兩種處理方法的固化效果和機理。結果表明： 相較于先吸水后固化，先固化后吸水處理方法所制備的固化土Ca2 + 含量更大，無側限抗壓強度更高，表明該方法的固化效果更好。這是因為先  固化后吸水的處理方法所制備固化土小孔徑的孔隙含量更大，土體結構更加緊密。該研究為淤泥固化土的工程制備提供了新思路和技術參考。

關鍵詞：淤泥固化土 ；固化方法 ；無側限抗壓強度 ；微觀試驗

中圖分類號：TU43            

文獻標志碼：A           

文章編號： 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

作者簡介：吳鴻昇  (1989—) ,  男 ，碩士 ，工程師 ，研究方向：巖土工程與結構工程。

通信作者：吳躍東  (1969—) ,  男 ，博士 ，教授 ，研究方向：基礎工程與地基處理。

收稿日期：2023- 03- 05