河道淤泥电渗-固化室内试验研究
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摘要
为达到河道淤泥的排水减量和加固强度要求,缩短加固处理工期、降低综合处理成本,进行单一电渗、单一固化、模拟电渗-固化的室内对比试验,研究不同通电电流、不同固化剂掺入比、固化龄期等因素对宁波河道淤泥加固效果的影响。同时结合扫描电镜探究了加固土的微观特征变化,并进行加固机理分析。研究结果表明:采用较低的通电电流可降低综合处理成本、处理效果更均匀;固化剂掺入比在6%～10%的范围内,掺入比越高,电渗-固化联合处理相对于采用单一固化加固能够提升的强度幅度更明显;采用相同的固化剂掺入比,电渗-固化联合处理更有利于胶结物和水化产物的生成,电渗排水作用对固化土后期强度增长起到重要作用。
In order to meet the requirement of moisture reduction and reinforcement strength for river sludge, as well as to shorten the treatment duration and reduce the comprehensive cost, the comparative laboratory tests of electroosmosis, solidification, and simulated electroosmosis-solidification are conducted. The reinforcement effects of Ningbo river sludge are studied with different electric current, different mixing ratios of solidification agent, different curing ages. Meanwhile, the micro-characteristic changes of reinforced sludge are explored by scanning electron microscope(SEM) and the reinforcement mechanism is analyzed. The results show that adopting a lower electric current can reduce the comprehensive cost and achieve the more uniform treatment effect. In the range of 6%～10% on mixing ratio of curing agent, the higher the mixing ratio, the more obvious the strength increasement for electroosmosis-solidification than that of single solidification reinforcement. When adopting the same mixing ratio of curing agent, the electroosmosis-solidification treatment is more conducive to form the cements and hydration products, and the drainage effect of electroosmosis plays an important role in the later strength growth of solidified sludge.
In order to meet the requirement of moisture reduction and reinforcement strength for river sludge, as well as to shorten the treatment duration and reduce the comprehensive cost, the comparative laboratory tests of electroosmosis, solidification, and simulated electroosmosis-solidification are conducted. The reinforcement effects of Ningbo river sludge are studied with different electric current, different mixing ratios of solidification agent, different curing ages. Meanwhile, the micro-characteristic changes of reinforced sludge are explored by scanning electron microscope(SEM) and the reinforcement mechanism is analyzed. The results show that adopting a lower electric current can reduce the comprehensive cost and achieve the more uniform treatment effect. In the range of 6%～10% on mixing ratio of curing agent, the higher the mixing ratio, the more obvious the strength increasement for electroosmosis-solidification than that of single solidification reinforcement. When adopting the same mixing ratio of curing agent, the electroosmosis-solidification treatment is more conducive to form the cements and hydration products, and the drainage effect of electroosmosis plays an important role in the later strength growth of solidified sludge.
引文
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[18]王梅,白晓红,梁仁旺,等.生石灰与粉煤灰桩加固软土地基的微观分析[J].岩土力学,2001,22(1):67-70(Wang Mei,Bai Xiaohong,Liang Renwang,et al.Mircostudy on soft foundations reinforcement with lime-fly ash piles[J].Rock and Soil Mechanics,2001,22(1):67-70(in Chinese))
[2]林莉,李青云,吴敏.河湖疏浚底泥无害化处理和资源化利用研究进展[J].长江科学院院报,2014,31(10):80-88(Lin Li,Li Qingyun,Wu Min.Advances in research on harmless treatment and resource utilization of dredged sediment of rivers and lakes[J].Journal of Yangtze River Scientific Research Institute,2014,31(10):80-88(in Chinese))
[3]杜延军,金飞,刘松玉,等.重金属工业污染场地固化/稳定处理研究进展[J].岩土力学,2011,32(1):116-124(Du Yanjun,Jin Fei,Liu Songyu,et al.Review of stabilization/solidification technique for remediation of heavy metals contaminated lands[J].Rock and Soil Mechanics,2011,32(1):116-124(in Chinese))
[4]郑凌逶,谢新宇,谢康和,等.电渗法加固地基试验及应用研究进展[J].浙江大学学报:工学版,2017,51(6):1064-1073(Zheng Lingwei,Xie Xinyu,Xie Kanghe,et al.Test and application research advance on foundation reinforcement by electro-osmosis method[J].Journal of Zhejiang University:Engineering Science,2017,51(6):1064-1073(in Chinese))
[5]Chien S C,Ou C Y,Wang M K.Injection of saline solutions to improve the electro-osmotic pressure and consolidation of foundation soil[J].Applied Clay Science,2009,44(3/4):218-224
[6]Ou C Y,Chien S C,Wang Y G.On the enhancement of electroosmotic soil improvement by the injection of saline solutions[J].Applied Clay Science,2009,44(1/2):130-136
[7]Wang J,Ma J,Liu F,et al.Experimental study on the improvement of marine clay slurry by electroosmosisvacuum preloading[J].Geotextiles and Geomembranes,2016,44(4):615-622
[8]符洪涛,王军,蔡袁强,等.低能量强夯-电渗法联合加固软黏土地基试验研究[J].岩石力学与工程学报,2015,34(3):612-620(Fu Hongtao,Wang Jun,Cai Yuanqiang,et al.Experimental study of combined application of electroosmosis and low-energy dynamic compaction in soft ground reinforcement[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(3):612-620(in Chinese))
[9]任连伟,肖扬,孔纲强,等.化学电渗法加固软黏土地基对比室内试验研究[J].岩土工程学报,2018,40(7):1247-1256(Ren Lianwei,Xiao Yang,Kong Gangqiang,et al.Laboratory tests on soft ground improvement by chemical electro-osmosis method[J].Chinese Journal of Geotechnical Engineering,2018,40(7):1247-1256(in Chinese))
[10]Peng J,Ye H,Alshawabkeh A N.Soil improvement by electroosmotic grouting of saline solutions with vacuum drainage at the cathode[J].Applied Clay Science,2015,114:53-60
[11]Xue Z,Tang X,Yang Q,et al.Mechanism of electro-osmotic chemical for clay improvement:Process analysis and clay property evolution[J].Applied Clay Science,2018,166:18-26
[12]Gray D H,Mitchell J K.Fundamental aspects of electro-osmosis in soils[J].Journal of the Soil Mechanics and Foundations Division,1967,93(6):209-236
[13]Micic S,Shang J Q,Lo K Y,et al.Electrokinetic strengthening of a marine sediment using intermittent current[J].Canadian Geotechnical Journal,2001,38(2):287-302
[14]Fourie A B,Johns D G,Jones C J F P.Dewatering of mine tailings using electrokinetic geosynthetics[J].Canadian Geotechnical Journal,2007,44(2):160-172
[15]Xue Z,Tang X,Yang Q,et al.Comparison of electro-osmosis experiments on marine sludge with different electrode materials[J].Drying Technology,2015,33(8):986-995
[16]Acar Y B,Hamed J T,Alshawabkeh A N,et al.Removal of cadmium(II)from saturated kaolinite by the application of electrical current[J].Geotechnique,1994,44(2):239-254
[17]简文彬,张登,黄春香.水泥-水玻璃固化软土的微观机理研究[J].岩土工程学报,2013,35(增2):632-637(Jian Wenbin,Zhang Deng,Huang Chunxiang.Micromechanism of cement-sodium silicate-stabilized soft soils[J].Chinese Journal of Geotechnical Engineering,2013,35(S2):632-637(in Chinese))
[18]王梅,白晓红,梁仁旺,等.生石灰与粉煤灰桩加固软土地基的微观分析[J].岩土力学,2001,22(1):67-70(Wang Mei,Bai Xiaohong,Liang Renwang,et al.Mircostudy on soft foundations reinforcement with lime-fly ash piles[J].Rock and Soil Mechanics,2001,22(1):67-70(in Chinese))
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