水平排水板真空预压–碱激发矿渣固化联合法处理高含水率淤泥的试验研究

doi:10.13722/j.cnki.jrme.2023.0040

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摘要疏浚淤泥具有含水率高、强度低、渗透性低等特点，快速高效的加固处理这些淤泥并实现其资源化利用具有重要意义。通过模型试验开展水平排水板真空预压–化学固化(PHDVPS)联合方法快速处理高含水率淤泥的研究。模型试验采用的固化剂包括不同配比的活性氧化镁激发粒化矿渣粉和硅酸盐水泥，并将联合方法的处理效果和效率与单一真空预压方法进行对比。在模型试验中，监测真空预压排水量和淤泥体积的变化；在模型试验结束后，测试不同养护龄期固化土样的无侧限抗压强度(UCS)，并对固化土样的微观结构进行分析。试验结果表明：与单一真空预压法相比，PHDVPS法具有更优越的减量效率和加固效果。固化剂会产生絮凝效应，有助于提高真空脱水效率和效果，使后续的固化反应在更密实的土体骨架中进行，从而进一步大幅提升土体强度。此外，对于PHDVPS方法，以活性氧化镁激发粒化矿渣粉作固化剂比以水泥为固化剂具有更好的减量效果和加固效果。

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	宋丁豹1
	蒲诃夫1
	胡海蓝2
	李展毅3
	张纯雪4

关键词 ：土力学, 高含水率淤泥, 水平排水板, 真空预压, 固化, 碱激发矿渣, 模型试验

Abstract：Dredged mud slurry has the characteristics of high water content，low or negligible strength and low hydraulic conductivity. Rapid and efficient treatment and utilization of these slurry are of great significance. This paper conducted a series of experimental to study the rapid treatment of high water content slurry using the combined method of prefabricated horizontal drain vacuum preloading and chemical solidification(abbreviated as PHDVPS). The solidifying agents used in the experiment included magnesium oxide(MgO)-activated ground granulated blast furnace slag(GGBS) and Portland cement. The treatment effect and efficiency of the combined method were compared with those of pure vacuum preloading method. Variation of discharged water mass and slurry volume were monitored during the vacuum preloading stage of the model tests，after which the unconfined compressive strength (UCS) of soil samples at different curing ages was tested，and the microstructures of the treated soils were analyzed. The experiment results indicates that PHDVPS method has a significantly better volume reduction efficiency and a significantly better reinforcement effect than the pure vacuum preloading method. The solidifying agent produces flocculation effects，which improve the vacuum dewatering efficiency，leaving the subsequent solidification process occurring in a denser state of soil matrix and thus achieving much higher strength. Moreover，using GGBS-MgO as the solidifying agent in PHDVPS method has better volume reduction and strength improvement effects than using cement.

Key words： soil mechanics high-water-content mud slurry prefabricated horizontal drain vacuum preloading solidification alkali-activated blast furnace slag model test

引用本文:

宋丁豹1，蒲诃夫1，胡海蓝2，李展毅3，张纯雪4. 水平排水板真空预压–碱激发矿渣固化联合法处理高含水率淤泥的试验研究[J]. 岩石力学与工程学报, 2023, 42(12): 3109-3119.
SONG Dingbao1，PU Hefu1，HU Hailan2，LI Zhanyi3，ZHANG Chunxue4. Experimental investigation on prefabricated horizontal drain-based vacuum preloading-alkali-activated GGBS solidification combined method for #br# treatment of high-water-content mud slurry. , 2023, 42(12): 3109-3119.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0040 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I12/3109

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