膨润土–砂混合型缓冲/回填材料渗气规律试验研究
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摘要
为研究高庙子膨润土–砂混合型缓冲/回填材料的渗气规律,利用改进的三轴渗气试验装置,对不同掺砂率、干密度和含水率的混合物试样进行一系列试验研究。结果表明:在试验研究的条件范围内,膨润土–砂混合物(含纯膨润土)的渗气系数为3.9×10-4~2.1×10-2 cm/s;膨润土–砂混合物的渗气规律遵循Darcy定律,但较高的气压力梯度对渗气系数值存在一定的影响;掺砂率、干密度和含水率均对混合物的渗气性质有影响,混合物的渗气系数随掺砂率增加呈指数形式增加,随干密度和含水率增加呈指数形式降低;在试验研究范围内建立了考虑不同条件下的混合物渗气系数的公式,与试验结果吻合较好。得到的一系列试验数据能为我国高放废物地质处置库的建设提供科学依据。
The improved triaxial gas permeable apparatus device was employed to conduct a series of experiments for sample of mixture with different sand ratios,dry densities and water contents in order to study the law of gas permeability of GMZ bentonite-sand mixture buffer/backfill materials. The result shows that within the range of experimental condition,the gas permeability coefficient of bentonite-sand mixture(including pure bentonite) is between 3.9×10-4–2.1×10-2 cm/s. Gas flow of bentonite-sand mixture materials can be expressed by Darcy law,but higher gas pressure gradient has certain influence to figure of gas permeability coefficient,and sand ratio,dry density and water content have effect on gas permeability of mixture respectively. The gas permeability ratio of mixture increases exponentially with the increase of sand ratio,while decreases exponentially with the increase of dry density and water content. The gas permeability coefficient formulas of mixture under different conditions were set up within the range of experimental research,which coincide well with the experimental result. A set of experimental data can provide scientific basis for the construction of HLW(high-level radioactive waste) geological disposal in China.
The improved triaxial gas permeable apparatus device was employed to conduct a series of experiments for sample of mixture with different sand ratios,dry densities and water contents in order to study the law of gas permeability of GMZ bentonite-sand mixture buffer/backfill materials. The result shows that within the range of experimental condition,the gas permeability coefficient of bentonite-sand mixture(including pure bentonite) is between 3.9×10-4–2.1×10-2 cm/s. Gas flow of bentonite-sand mixture materials can be expressed by Darcy law,but higher gas pressure gradient has certain influence to figure of gas permeability coefficient,and sand ratio,dry density and water content have effect on gas permeability of mixture respectively. The gas permeability ratio of mixture increases exponentially with the increase of sand ratio,while decreases exponentially with the increase of dry density and water content. The gas permeability coefficient formulas of mixture under different conditions were set up within the range of experimental research,which coincide well with the experimental result. A set of experimental data can provide scientific basis for the construction of HLW(high-level radioactive waste) geological disposal in China.
引文
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[11]王勇,孔令伟,郭爱国,等.杭州地铁储气砂土的渗气性试验研究[J].岩土力学,2009,30(3):815–819.(WANG Yong,KONG Lingwei,GUO Aiguo,et al.Experimental research on gas permeability of shallow gassy sand in Hangzhou metro project[J].Rock and Soil Mechanics,2009,30(3):815–819.(in Chinese))
[12]苗强强,陈正汉,张磊,等.非饱和黏土质砂的渗气规律试验研究[J].岩土力学,2010,31(12):3 746–3 750.(MIAO Qiangqiang,CHEN Zhenghan,ZHANG Lei,et al.Experimental study of gas permeability of unsaturated clayey sand[J].Rock and Soil Mechanics,2010,31(12):3 746–3 750.(in Chinese))
[13]汪龙,方祥位,申春妮,等.膨润土–砂混合型缓冲/回填材料液塑限试验研究[J].后勤工程学院学报,2013,29(6):1–5.(WANG Long,FANG Xiangwei,SHEN Chunni,et al.Study on liquid and plastic limit of bentonite-sand mixtures as buffer/backfilling materials[J].Journal of Logistical Engineering University,2013,29(6):1–5.(in Chinese))
[14]汪龙,方祥位,孙发鑫,等.膨润土–砂混合型缓冲/回填材料土–水特征曲线研究[J].岩土力学,2013,34(8):2 264–2 270.(WANG Long,FANG Xiangwei,SUN Faxin,et al.Test on soil-water characteristic curves of bentonite-sand mixtures[J].Rock and Soil Mechanics,2013,34(8):2 264–2 270.(in Chinese))
[2]崔玉军,陈宝.高放核废物地质处置中工程屏障研究新进展[J].岩石力学与工程学报,2006,25(4):842–847.(CUI Yujun,CHEN Bao.Recent advances in research on engineered barrier for geological disppsal of high-level radioactive nuclear waste[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(4):842–847.(in Chinese))
[3]ALONSO E E.Gas migration through barriers[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(4):693–708.
[4]GALLéC,TANAI K.Evaluation of gas transport properties of backfill materials for waste disposal:H2 migration experiments in compacted Fo-Ca clay[J].Clays and Clay Minerals,1998,46(5):498–508.
[5]LOOSVELDT H,LAFHAJ Z,SKOCZYLAS F.Experimental study of gas and liquid permeability of a mortar[J].Cement and Concrete Research,2002,32(9):1 357–1 363.
[6]BOUAZZA A,VANGPAISAL T.An apparatus to measure gas permeability of geosynthetic clay liners[J].Geotextiles and Geomembranes,2003,21(2):85–101.
[7]ARNEDO D,ALONSO E E,OLIVELLA S,et al.Gas injection tests on sand/bentonite mixtures in the laboratory:experimental results and numerical modelling[J].Physics and Chemistry of the Earth:Parts A/B/C,2008,33(10):237–247.
[8]陈正汉,谢定义,王永胜.非饱和土的水气运动规律及其工程性质研究[J].岩土工程学报,1993,15(3):9–20.(CHEN Zhenghan,XIE Dingyi,WANG Yongsheng.Experimental studies of laws of fluid motion,suction and pore pressures in unsaturated soil[J].Chinese Journal of Geotechnical Engineering,1993,15(3):9–20.(in Chinese))
[9]王永胜,谢定义,郭庆国.非饱和土中气体的运动特性与渗气系数的测定[J].西北水电,1993,(1):43–49.(WANG Yongsheng,XIEDingyi,GUO Qingguo.Laws of gas motion in unsaturated soil and determination of air permeability[J].Northwest Water Power,1993,(1):43–49.(in Chinese))
[10]姚志华,陈正汉,黄雪峰,等.非饱和Q3黄土渗气特性试验研究[J].岩石力学与工程学报,2012,31(6):1 264–1 273.(YAO Zhihua,CHEN Zhenghan,HUANG Xuefeng,et al.Experimental research on gas permeability of unsaturated Q3 loess[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(6):1 264–1 273.(in Chinese))
[11]王勇,孔令伟,郭爱国,等.杭州地铁储气砂土的渗气性试验研究[J].岩土力学,2009,30(3):815–819.(WANG Yong,KONG Lingwei,GUO Aiguo,et al.Experimental research on gas permeability of shallow gassy sand in Hangzhou metro project[J].Rock and Soil Mechanics,2009,30(3):815–819.(in Chinese))
[12]苗强强,陈正汉,张磊,等.非饱和黏土质砂的渗气规律试验研究[J].岩土力学,2010,31(12):3 746–3 750.(MIAO Qiangqiang,CHEN Zhenghan,ZHANG Lei,et al.Experimental study of gas permeability of unsaturated clayey sand[J].Rock and Soil Mechanics,2010,31(12):3 746–3 750.(in Chinese))
[13]汪龙,方祥位,申春妮,等.膨润土–砂混合型缓冲/回填材料液塑限试验研究[J].后勤工程学院学报,2013,29(6):1–5.(WANG Long,FANG Xiangwei,SHEN Chunni,et al.Study on liquid and plastic limit of bentonite-sand mixtures as buffer/backfilling materials[J].Journal of Logistical Engineering University,2013,29(6):1–5.(in Chinese))
[14]汪龙,方祥位,孙发鑫,等.膨润土–砂混合型缓冲/回填材料土–水特征曲线研究[J].岩土力学,2013,34(8):2 264–2 270.(WANG Long,FANG Xiangwei,SUN Faxin,et al.Test on soil-water characteristic curves of bentonite-sand mixtures[J].Rock and Soil Mechanics,2013,34(8):2 264–2 270.(in Chinese))