粒化高炉矿渣-氧化镁固化连云港软土的力学特性试验
|
摘要
为研究粒化高炉矿渣-氧化镁对连云港软土固化体力学特性的影响规律,采用粒化高炉矿渣-氧化镁(GBM)对连云港地区软土进行固化处理,并与相同添加量的普通硅酸盐水泥(OPC)固化土作对比。采用抗压强度试验和渗透试验,探讨了GBM对软土固化体力学特性的影响规律,并结合压汞试验(MIP)和扫描电镜试验(SEM)分析了GBM-软土相互作用的内在机理。结果表明:GBM和OPC均会提高软土固化体的力学特性,但相同添加量的GBM固化土的抗压强度大于OPC固化土,且相同添加量的GBM固化土的渗透系数和含水率均低于OPC固化土。压汞试验结果表明:相同添加量的GBM固化土的孔隙体积低于OPC固化土,且OPC主要改变了固化土中孔径>1μm孔隙体积,而GBM主要改变了固化土中孔径>0.1μm孔隙体积。扫描电镜试验结果表明:相同添加量的GBM固化土的土颗粒团聚和胶结程度均高于OPC固化土。孔隙分布、土颗粒团聚和胶结程度的差异是GBM固化土力学特性优于OPC固化土的本质原因。
In order to investigate the mechanical property influence of granulated blast furnace slag,magnesium oxide and ordinary portland cement on solidified soft soil,ordinary portland cement,granulated blast-furnace slag and magnesium oxide were used to solidify Lianyungang soft soil. The differences in the mechanical properties of ordinary portland cement,granulated blast-furnace slag and magnesium oxide solidified Lianyungang soft soil were examined using water content test,unconfined compressive strength test and permeability test. Changes in the soil microstructural properties were interpreted by scanning electron microscope observations and mercury intrusion porosimetry tests. Results indicated that ordinary portland cement and granulated blast-furnace slag-magnesium oxide had an efficient effect on soft soil. The unconfined compressive strength and hydraulic conductivity were improved significantly with the increase in cement dosage.In addition,the unconfined compressive strength and hydraulic conductivity of ordinary portland cement solidified soft soil were worse than ground granulated blast-furnace slag and magnesium oxide solidified soft soil at the same reactant dosage. Mercury intrusion porosimetry test results showed that the pore volumes of ordinary portland cement,granulated blast-furnace slag and magnesium oxide solidified soil were decreased significantly with the increase in cement dosage.The pore volume whose diameter was larger than 1. 0 μm in ordinary portland cement solidified soft soil was changed. However,the pore volume whose diameter was larger than 0.1 μm in granulated blast-furnace slag and magnesium oxide solidified soft soil was changed. Scanning electron microscope test results showed that a larger aggregation was formed with a smaller void space in soils as the ordinary portland cement and granulated blast furnace slag-magnesium oxide dosages were increased. However,the degree of consolidation of granulated blast furnace slag-magnesium oxide solidified soil was better than ordinary portland cement solidified soil. The differences in mechanical properties of ordinary portland cement and granulated blast furnace slag-magnesium oxide solidified soil was attributed to the differences in pore volume and microstructure features in solidified soil.
In order to investigate the mechanical property influence of granulated blast furnace slag,magnesium oxide and ordinary portland cement on solidified soft soil,ordinary portland cement,granulated blast-furnace slag and magnesium oxide were used to solidify Lianyungang soft soil. The differences in the mechanical properties of ordinary portland cement,granulated blast-furnace slag and magnesium oxide solidified Lianyungang soft soil were examined using water content test,unconfined compressive strength test and permeability test. Changes in the soil microstructural properties were interpreted by scanning electron microscope observations and mercury intrusion porosimetry tests. Results indicated that ordinary portland cement and granulated blast-furnace slag-magnesium oxide had an efficient effect on soft soil. The unconfined compressive strength and hydraulic conductivity were improved significantly with the increase in cement dosage.In addition,the unconfined compressive strength and hydraulic conductivity of ordinary portland cement solidified soft soil were worse than ground granulated blast-furnace slag and magnesium oxide solidified soft soil at the same reactant dosage. Mercury intrusion porosimetry test results showed that the pore volumes of ordinary portland cement,granulated blast-furnace slag and magnesium oxide solidified soil were decreased significantly with the increase in cement dosage.The pore volume whose diameter was larger than 1. 0 μm in ordinary portland cement solidified soft soil was changed. However,the pore volume whose diameter was larger than 0.1 μm in granulated blast-furnace slag and magnesium oxide solidified soft soil was changed. Scanning electron microscope test results showed that a larger aggregation was formed with a smaller void space in soils as the ordinary portland cement and granulated blast furnace slag-magnesium oxide dosages were increased. However,the degree of consolidation of granulated blast furnace slag-magnesium oxide solidified soil was better than ordinary portland cement solidified soil. The differences in mechanical properties of ordinary portland cement and granulated blast furnace slag-magnesium oxide solidified soil was attributed to the differences in pore volume and microstructure features in solidified soil.
引文
[1]ZHANG Z G,HUANG M S.Geotechnical influence on existing subway tunnels induced by multiline tunneling in Shanghai soft soil[J].Computers and Geotechnics,2014,56:121-132.DOI:10.1016/j.compgeo.2013.11.008.
[2]GONG X,NIU J G,LIANG S H,et al.Solidification of Nansha soft clay using cement-based composite curing agents[J].Advances in Cement Research,2018:1-12.DOI:10.1680/jadcr.18.00040.
[3]张亭亭,李江山,王平,等.磷酸镁水泥固化铅污染土的应力:应变特性研究[J].岩土力学,2016,37(S1):215-225.DOI:10.16285/j.rsm.2016.S1.028.ZHANG T T,LI J S,WANG P,et al.Experimental study of stress-strain properties of lead-contaminated soils treated by magnesium phosphate cement[J].Rock and Soil Mechanics,2016,37(S1):215-225.
[4]张亭亭,魏明俐,熊欢,等.多硫化钙对铬污染土的稳定性能及铬赋存形态试验研究[J].岩石力学与工程学报,2017,36(S2):4282-4289.DOI:10.13722/j.cnki.jrme.2017.1166.ZHANG T T,WEI M L,XIONG H,et al.Chromium speciation and leaching behaviors of chromium contaminated soil stabilized by calcium polysulfide[J].Chinese Journal of Rock Mechanics and Engineering,2017,36(S2):4282-4289.
[5]WANG F,JIN F,SHEN Z T,et al.Three-year performance of in-situ massstabilised contaminated site soils using MgO-bearing binders[J].Journal of Hazardous Materials,2016,318:302-307.DOI:10.1016/j.jhazmat.2016.07.018.
[6]DU Y J,BO Y L,JIN F,et al.Durability of reactive magnesiaactivated slag-stabilized low plasticity clay subjected to dryingwetting cycle[J].European Journal of Environmental and Civil Engineering,2016,20(2):215-230.DOI:10.1080/19648189.2015.1030088.
[7]易耀林,李晨,孙川,等.碱激发矿粉固化连云港软土试验研究[J].岩石力学与工程学报,2013,32(9):1820-1826.DOI:10.3969/j.issn.1000-6915.2013.09.013.YI Y L,LI C,SUN C,et al.Test on alkali-activated ground granulated blast-furnace slag(ggbs)for Lianyungang soft soil stabilization[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(9):1820-1826.
[8]LIU S Y,CAI G H,DU Y J,et al.Engineering properties of carbonated reactive magnesia-stabilized silt under different activity index[J].Procedia Engineering,2017,189:158-165.DOI:10.1016/j.proeng.2017.05.026.
[9]DU Y J,WEI M L,REDDY K R,et al.New phosphate-based binder for stabilization of soils contaminated with heavy metals:Leaching,strength and microstructure characterization[J].Journal of Environmental Management,2014,146:179-188.DOI:10.1016/j.jenvman.2014.07.035.
[10]WEI M L,DU Y J,REDDY K R,et al.Effects of freeze-thaw on characteristics of new KMP binder stabilized Zn-and Pb-contaminated soils[J].Environmental Science and Pollution Research,2015,22(24):19473-19484.DOI:10.1007/s11356-015-5133-z.
[11]张亭亭,李江山,王平,等.磷酸镁水泥固化铅污染土的力学特性试验研究及微观机制[J].岩土力学,2016,37(S2):279-286.DOI:10.16285/j.rsm.2016.S2.034.ZHANG T T,LI J S,WANG P,et al.Experimental study of mechanical and microstructure properties of magnesium phosphate cement treated lead contaminated soils[J].Rock and Soil Mechanics,2016,37(S2):279-286.
[12]薄煜琳,于博伟,杜延军,等.淋滤条件下GGBS-MgO固化铅污染黏土强度与溶出特性研究[J].岩土力学,2015,36(10):2877-2891,2906.DOI:10.16285/j.rsm.2015.10.018.BO Y L,YU B W,DU Y J,et al.Strength and leachability of lead contaminated clay stabilized by GGBS-MgO[J].Rock and Soil Mechanics,2015,36(10):2877-2891,2906.
[13]查甫生,刘晶晶,许龙,等.水泥固化重金属污染土干湿循环特性试验研究[J].岩土工程学报,2013,35(7):1246-1252.ZHA F S,LIU J J,XU L,et al.Cyclic wetting and drying tests on heavy metal contaminated soils solidified/stabilized by cement[J].Chinese Journal of Geotechnical Engineering,2013,35(7):1246-1252.
[14]薄煜琳,杜延军,魏明俐,等.干湿循环对GGBS+MgO改良黏土强度影响的试验研究[J].岩土工程学报,2013,35(S1):134-139.BO Y L,DU Y J,WEI M L,et al.Effect of wetting-drying cycles on strength properties of ground granulated blast-furnace slag and magnesium oxide-stabilized soft clay[J].Chinese Journal of Geotechnical Engineering,2013,35(S1):134-139.
[15]HORPIBULSUK S,RACHAN R,RAKSACHON Y.Role of fly ash on strength and microstructure development in blended cement stabilized silty clay[J].Soils and Foundations,2009,49(1):85-98.DOI:10.3208/sandf.49.85.
[16]VINOKUROV S E,KULIKOVA S A,KRUPSKAYA V V,et al.Magnesium potassium phosphate compound for radioactive waste immobilization:phase composition,structure,and physicochemical and hydrolytic durability[J].Radiochemistry,2018,60(1):70-78.DOI:10.1134/s1066362218010125.
[17]张亭亭,王平,李江山,等.养护龄期和铅含量对磷酸镁水泥固化/稳定化铅污染土的固稳性能影响规律及微观机制[J].岩土力学,2018,39(6):2115-2123.DOI:10.16285/j.rsm.2016.1844.ZHANG T T,WANG P,LI J S,et al.Effect of curing time and lead concentration on mechanical properties of lead-contaminated soils stabilized by magnesium phosphate cement[J].Rock and Soil Mechanics,2018,39(6):2115-2123.
[2]GONG X,NIU J G,LIANG S H,et al.Solidification of Nansha soft clay using cement-based composite curing agents[J].Advances in Cement Research,2018:1-12.DOI:10.1680/jadcr.18.00040.
[3]张亭亭,李江山,王平,等.磷酸镁水泥固化铅污染土的应力:应变特性研究[J].岩土力学,2016,37(S1):215-225.DOI:10.16285/j.rsm.2016.S1.028.ZHANG T T,LI J S,WANG P,et al.Experimental study of stress-strain properties of lead-contaminated soils treated by magnesium phosphate cement[J].Rock and Soil Mechanics,2016,37(S1):215-225.
[4]张亭亭,魏明俐,熊欢,等.多硫化钙对铬污染土的稳定性能及铬赋存形态试验研究[J].岩石力学与工程学报,2017,36(S2):4282-4289.DOI:10.13722/j.cnki.jrme.2017.1166.ZHANG T T,WEI M L,XIONG H,et al.Chromium speciation and leaching behaviors of chromium contaminated soil stabilized by calcium polysulfide[J].Chinese Journal of Rock Mechanics and Engineering,2017,36(S2):4282-4289.
[5]WANG F,JIN F,SHEN Z T,et al.Three-year performance of in-situ massstabilised contaminated site soils using MgO-bearing binders[J].Journal of Hazardous Materials,2016,318:302-307.DOI:10.1016/j.jhazmat.2016.07.018.
[6]DU Y J,BO Y L,JIN F,et al.Durability of reactive magnesiaactivated slag-stabilized low plasticity clay subjected to dryingwetting cycle[J].European Journal of Environmental and Civil Engineering,2016,20(2):215-230.DOI:10.1080/19648189.2015.1030088.
[7]易耀林,李晨,孙川,等.碱激发矿粉固化连云港软土试验研究[J].岩石力学与工程学报,2013,32(9):1820-1826.DOI:10.3969/j.issn.1000-6915.2013.09.013.YI Y L,LI C,SUN C,et al.Test on alkali-activated ground granulated blast-furnace slag(ggbs)for Lianyungang soft soil stabilization[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(9):1820-1826.
[8]LIU S Y,CAI G H,DU Y J,et al.Engineering properties of carbonated reactive magnesia-stabilized silt under different activity index[J].Procedia Engineering,2017,189:158-165.DOI:10.1016/j.proeng.2017.05.026.
[9]DU Y J,WEI M L,REDDY K R,et al.New phosphate-based binder for stabilization of soils contaminated with heavy metals:Leaching,strength and microstructure characterization[J].Journal of Environmental Management,2014,146:179-188.DOI:10.1016/j.jenvman.2014.07.035.
[10]WEI M L,DU Y J,REDDY K R,et al.Effects of freeze-thaw on characteristics of new KMP binder stabilized Zn-and Pb-contaminated soils[J].Environmental Science and Pollution Research,2015,22(24):19473-19484.DOI:10.1007/s11356-015-5133-z.
[11]张亭亭,李江山,王平,等.磷酸镁水泥固化铅污染土的力学特性试验研究及微观机制[J].岩土力学,2016,37(S2):279-286.DOI:10.16285/j.rsm.2016.S2.034.ZHANG T T,LI J S,WANG P,et al.Experimental study of mechanical and microstructure properties of magnesium phosphate cement treated lead contaminated soils[J].Rock and Soil Mechanics,2016,37(S2):279-286.
[12]薄煜琳,于博伟,杜延军,等.淋滤条件下GGBS-MgO固化铅污染黏土强度与溶出特性研究[J].岩土力学,2015,36(10):2877-2891,2906.DOI:10.16285/j.rsm.2015.10.018.BO Y L,YU B W,DU Y J,et al.Strength and leachability of lead contaminated clay stabilized by GGBS-MgO[J].Rock and Soil Mechanics,2015,36(10):2877-2891,2906.
[13]查甫生,刘晶晶,许龙,等.水泥固化重金属污染土干湿循环特性试验研究[J].岩土工程学报,2013,35(7):1246-1252.ZHA F S,LIU J J,XU L,et al.Cyclic wetting and drying tests on heavy metal contaminated soils solidified/stabilized by cement[J].Chinese Journal of Geotechnical Engineering,2013,35(7):1246-1252.
[14]薄煜琳,杜延军,魏明俐,等.干湿循环对GGBS+MgO改良黏土强度影响的试验研究[J].岩土工程学报,2013,35(S1):134-139.BO Y L,DU Y J,WEI M L,et al.Effect of wetting-drying cycles on strength properties of ground granulated blast-furnace slag and magnesium oxide-stabilized soft clay[J].Chinese Journal of Geotechnical Engineering,2013,35(S1):134-139.
[15]HORPIBULSUK S,RACHAN R,RAKSACHON Y.Role of fly ash on strength and microstructure development in blended cement stabilized silty clay[J].Soils and Foundations,2009,49(1):85-98.DOI:10.3208/sandf.49.85.
[16]VINOKUROV S E,KULIKOVA S A,KRUPSKAYA V V,et al.Magnesium potassium phosphate compound for radioactive waste immobilization:phase composition,structure,and physicochemical and hydrolytic durability[J].Radiochemistry,2018,60(1):70-78.DOI:10.1134/s1066362218010125.
[17]张亭亭,王平,李江山,等.养护龄期和铅含量对磷酸镁水泥固化/稳定化铅污染土的固稳性能影响规律及微观机制[J].岩土力学,2018,39(6):2115-2123.DOI:10.16285/j.rsm.2016.1844.ZHANG T T,WANG P,LI J S,et al.Effect of curing time and lead concentration on mechanical properties of lead-contaminated soils stabilized by magnesium phosphate cement[J].Rock and Soil Mechanics,2018,39(6):2115-2123.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |