Undrained shear behavior of loess saturated with different concentrations of sodium chloride solution
Undrained shear behavior of loess saturated with different concentrations of sodium chloride solution
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DOI：
10.1016/j.enggeo.2012.12.018
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发表时间：
2013-03
影响因子：
7.4
通讯作者：
Fanyu Zhang;Gong-hui Wang;T. Kamai;Wenwu Chen;Dexuan Zhang;Jun Yang
中科院分区：
文献类型：
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作者：
Fanyu Zhang;Gong-hui Wang;T. Kamai;Wenwu Chen;Dexuan Zhang;Jun Yang
对饱和黄土进行了一系列环剪试验，研究了孔隙水中氯化钠浓度和脱盐对不排水条件下剪切行为的影响。黄土样品取自中国经常发生的滑坡地表，用含有不同浓度 NaCl 的脱气蒸馏水饱和，然后进行不排水剪切。之后，将样品取出，重新成型，重新放入剪切箱中，并通过脱气的蒸馏水重新饱和，使样品脱盐，然后再次进行不排水剪切。通过比较不排水剪切行为，考察了孔隙水中氯化钠和脱盐对黄土不排水剪切行为的影响。结果表明，孔隙水中氯化钠浓度的变化会强烈影响饱和黄土的剪切行为。峰值剪切强度和稳态强度均随着 NaCl 浓度的增加而增加，直到一定值后，随着 NaCl 浓度的进一步增加，峰值剪切强度和稳态强度下降。同时，脱盐后的样品的峰值剪切强度和稳态强度恢复到原始样品的水平；因此，盐化的影响是可逆的。这些发现对于更好地了解中国反复发生的一些灌溉引起的黄土滑坡可能具有实际意义。
A series of ring-shear tests was conducted on saturated loess to investigate the effects of NaCl concentration in pore water and desalinization on the shear behavior under undrained conditions. The loess samples were taken from the ground surface of a frequently active landslide in China, were saturated by de-aired, distilled water with different concentrations of NaCl, and then were sheared undrained. After that, the samples were retrieved, remolded, re-set into the shear box, and re-saturated by passing through de-aired, distilled water such that the samples were desalinized, and then were sheared undrained again. Through comparing the undrained shear behavior, the effects of NaCl in the pore-water and desalinization on the undrained shear behavior of loess were examined. The results showed that the variation of NaCl concentration in pore water can strongly affect the shear behavior of saturated loess. Both the peak shear strength and steady-state strength increased with increase of NaCl concentration until a certain value, after which they decreased with further increase of NaCl concentration. Meanwhile, the peak shear strength and steady-state strength of the desalinized samples recovered to those of the original sample; hence, the effects of salinization are reversible. These findings may be of practical importance to better understand the repeated occurrence of some irrigation-induced loess landslides in China.