| 摘要: |
| [目的]了解某大坝防渗心墙土料产生分散性的原因.[方法]对6组土样的物理化学性质进行了测定,并采用双比重计法、针孔试验、碎块试验、孔隙水可溶盐试验和交换性钠百分比试验5项室内判别试验,分别对6组土样的分散性进行鉴定.[结果]6组土样均为低液限粘土,粘粒(＜0.005 mm)含量为120～275 g/kg,pH值较高,为8.29～9.07,属强碱性土;6组土样易溶盐含量为0.234～0.523 g/kg,中溶盐含量为0.33～0.66 g/kg,难溶盐含量为11.41～148.79 g/kg;6组土样中粘土矿物的主要成分均是伊利石,其含量为130～220 g/kg,全土中蒙脱石含量较少(43～87 g/kg).经5项室内判别试验综合判定,2号和4号土样均为过渡性土,其他4组土样均为分散性土.[结论]土样粘粒(＜0.005 mm)含量低、pH值高及土样中含有一定量的钠离子,是土样产生分散性的主要原因. |
| 关键词: 土坝 心墙土料 分散性 粘土矿物 |
| DOI： |
| 分类号:F303.1 |
| 基金项目:陕西省自然科学基础研究计划项目（2005D06） |
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| Study on the dispersibility of physical and chemical properties analysis and dispersive test for soil core wall |
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DU Jun-nan,YAN Jian-xing,DU Jun-nan,YAN Jian-xing,DU Jun-nan,YAN Jian-xing
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| Abstract: |
| 【Objective】 The study is to find out the dispersive mechanism of core wall.【Method】 Six groups of soil samples of physical and chemical properties were determined.The tests for identification of dispersive clay soils were studied by double-hydrometer test，pinhole test，crumb test，test for anion of soluble salts of pore water and test for percentage of exchangeable sodium.【Result】 Six groups of soil samples were CL,clay (<0.005 mm) content being 120-275 g/kg,with higher soil pH,from 8.29 to 9.07,which belongs to alkaline soil,a strong alkaline soil; six groups of soil samples soluble salt content is 0.234-0.523 g/kg,the dissolved salt content is 0.33-0.66 g/kg,insoluble salt content is 11.41-148.79 g/kg;6 group of clay minerals in the soil samples that the main ingredients is grundite,and its content is 130-220 g/kg,montmorillonite is little,only 43-87 g/kg.Based on comprehensive judge ment,No.2 and No.4 samples are determined to be transition clay and the remaining 4 groups the dispersive clay.【Conclusion】 Clay soil samples (<0.005 mm) in low,higher pH and soil samples contain a certain amount of sodium are the main reasons for these groups. |
| Key words: earth dam core clay dispersive clay mineral |
