Effect of pore-water chemistry on undrained shear behaviour of saturated loess

Effect of pore-water chemistry on undrained shear behaviour of saturated loess
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孔隙水化学对饱和黄土不排水剪切行为的影响

DOI:
10.1144/qjegh2013-085
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发表时间:
2014-04
影响因子:
1.4
通讯作者:
Chen, Wenwu
Chen, Wenwu
中科院分区:
地球科学4区
文献类型:
--
作者:
Zhang, Fanyu;Wang, Gonghui;Kamai, Toshitaka;Chen, Wenwu

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孔隙水化学对土壤的剪切行为具有根本性影响。为研究盐分浓度和脱盐对黄土不排水剪切特性的影响,在相同初始孔隙比和固结应力条件下,对不同浓度NaCl溶液饱和的黄土进行了一系列环剪试验。结果表明,峰值和稳态剪切强度增加的NaCl浓度的增加,只有到一定的水平。当超过该水平时,NaCl浓度的任何进一步增加导致较低的剪切强度。经过脱盐处理后,黄土的峰值抗剪强度和稳态抗剪强度均恢复到原状,说明黄土的盐渍化是可逆的。孔压比为0.6时,可作为判断饱和黄土是否发生液化的标准。这些结果可能为黄土高原地区灌溉诱发黄土滑坡的渐进性或季节性活动提供一个有用的解释。
Pore-water chemistry can have a fundamental influence on the shear behaviour of soil. To study the effects of salt concentration and desalinization on undrained shear behaviour, a series of ring shear tests was conducted on Chinese loess saturated with various NaCl solutions of differing concentration, under the same initial void ratio and consolidating stress conditions. Results showed that the peak and steady-state shear strengths increase as the NaCl concentration increases only up to a certain level. When this level is exceeded, any further increase of NaCl concentration results in lower shear strengths. After desalinization the peak and steady-state shear strengths recover to those of the original sample, showing that the salinization of loess is reversible. A pore pressure ratio of 0.6 can be used as a criterion to assess whether liquefaction can be induced in saturated loess. These findings may provide a useful explanation for progressive or seasonal activity of some irrigation-induced loess landslides in the Chinese Loess Plateau.
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