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甘肃北山被首选为修建高放废物处置库的地区。考虑到该地区地下水中含有总溶解固体(TDS),选择NaCl-Na2SO4作为溶解固体。以高庙子钠基膨润土为试验材料,利用单向固结仪,进行不同TDS浓度盐溶液和蒸馏水饱和的膨胀试验。根据蒙脱石孔隙比的概念,统一整理了饱和高庙子膨润土在盐溶液和蒸馏水饱和下的膨胀特性。结果表明,当TDS浓度为12.3 g/L(预选处置库区的最高离子浓度)时,在双对数坐标中蒙脱石孔隙比与膨胀力关系和干密度与膨胀力关系均呈直线且平行于蒸馏水的试验结果;对于给定干密度试样,膨胀力的对数与TDS浓度呈线性关系。根据以上试验结果,给出了由高庙子钠基膨润土的设计干密度和离子浓度计算相应膨胀力和膨胀变形的表达式。
Beishan, Gansu Province, was the preferred area for the construction of a high-level radioactive waste repository. Considering the total dissolved solids (TDS) in groundwater in the area, NaCl-Na2SO4 was chosen as the dissolved solid. Taking Gaomiaozi Na-bentonite as test material, the swelling test of different TDS concentration salt solution and distilled water saturation was carried out by unidirectional consolidation machine. According to the concept of void ratio of montmorillonite, the swelling properties of saturated polygonatonic bentonite under salt solution and distilled water saturation were unifiedly arranged. The results showed that the relationship between void ratio and swelling force and the relationship between dry density and swelling force were linear and parallel in double logarithmic coordinates when the concentration of TDS was 12.3 g / L (the highest concentration of ions in preselected reservoir area) Test results in distilled water; for a given dry density sample, the logarithm of the swelling force is linearly proportional to the TDS concentration. Based on the above test results, the expressions of the corresponding expansion force and expansion deformation are calculated from the designed dry density and ion concentration of Naogiezi Na-bentonite.