THE EXPERIMENTAL STUDY ON THE UNIAXIAL COMPRESSIVE STRENGTH OF FROZEN SILT WITH DIFFERENT SALT CONTENT
THE EXPERIMENTAL STUDY ON THE UNIAXIAL COMPRESSIVE STRENGTH OF FROZEN SILT WITH DIFFERENT SALT CONTENT
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发表时间：
2013
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通讯作者：
C. Ji
中科院分区：
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作者：
C. Ji
对采自白银市平川区的盐渍化粉土进行脱盐处理，并加入纯NaCl和Na 2SO 4作为试验土样。最后，通过恒温、恒应变率单轴压缩试验，研究了盐对单轴抗压强度和破坏应变的影响。试验结果表明，当质量分数为0 ~ 3%时，随着NaCl含量的增加，冻土中未冻水含量增加，土粒间距增大，土粒粘聚力和内摩擦角减小，单轴抗压强度呈指数形式减小，破坏应变先增大后减小。由于Na 2SO 4的特殊化学性质，不同含量的Na 2SO 4对冻土单轴抗压强度的影响不同。当Na 2SO 4质量分数为0 ~ 3%时，随着Na 2SO 4质量分数的增加，冻结粉土的单轴抗压强度先增大后减小。而破坏应变与单轴抗压强度的变化趋势完全相反。
The saline silt, which was collected from the Pingchuan district of Baiyin city, was firstly washed off salt, and then pure NaCl and Na2SO4 were added into the silt as the testing sample soil. Finally, the influences of salt on the uniaxial compressive strength and the failure strain were studied through uniaxial compressive tests at a constant temperature and a strain rate. The test results show that if the mass content is between 0 and 3%, as the NaCl content increases, the unfrozen water in frozen soil and the distance between soil particles increase, cohesive force and internal friction angle of soil particles decrease, so the uniaxial compressive strength decreases in an exponential form and the failure strain increases at first and then decreases. Due to the special chemical, different Na2SO4 contents play different roles in the change of uniaxial compressive strength of frozen soil. When the mass content is between 0 and 3%, with the increase of Na2SO4, the uniaxial compressive strength of frozen silt increases at first and then decreases afterwards. While the failure strain has completely opposite changing trend with the uniaxial compressive strength.