An Experimental Study of Influence of Water Content on Uniaxial Compression Strength of Frozen Salty Silt
An Experimental Study of Influence of Water Content on Uniaxial Compression Strength of Frozen Salty Silt
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发表时间：
2012
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通讯作者：
Chengwei Jin;Li Dongqing;Bing Hui;Deng You-sheng
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作者：
Chengwei Jin;Li Dongqing;Bing Hui;Deng You-sheng
为了寻找冻结含盐粉土在含水量影响下的单轴抗压强度和破坏应变变化规律，以甘肃省白银市平川地区黄河沿岸天然盐渍土为样本。土壤经蒸馏水浸出后，制备含盐量为1.5%、含水量不同的NaCl/Na2SO4试样。试验中使用分析纯硫酸钠和氯化钠。试验结果表明，当含水量较低时，随着含水量的增加，冰的胶结力增大，同时冰承受的土颗粒和盐晶体载荷越来越大，因此冻结盐渍土的单轴抗压强度增大。当含水量增加到一定程度时，冰在土中起主导作用，试样呈现冰的性质，冰的抗压强度远小于矿物颗粒，所以当含水量超过一定值时，冻结盐粉土的单轴抗压强度会降低。破坏应变与单轴抗压强度随含水率的变化规律相似。
In order to find the change law of uniaxial compression strength and failure strain of freezing salty silt under the influence of water content,natural saline soil was collected from the shore side of the Yellow River in Pingchuan district of Baiyin Municipality of Gansu Province as the sample.After leaching with distilled water,the soil was used to prepare specimens containing NaCl/Na2SO4 at salt content of 1.5% with different water contents.Analytically pure sodium sulfate and sodium chloride are used in the test.The test results indicate that when the water content was low,as the water content increasing,cementing power of ice increases,at the same time,ice endure more and more load with soil particles and crystals of salt,so the uniaxial compression strength of frozen salty soil will increase.When the water content increases to a certain degree,ice plays a leading role in the soil,the specimen presents the properties of ice,and the compression strength of ice is far less than that of mineral grains,so the uniaxial compression strength of frozen salty silt will decrease when the water content is over a given value.Failure strain has the similar change law with uniaxial compression strength changing with water content.