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冰川冻土  2014 

含盐冻结粉质砂土的强度参数和强度准则试验研究

DOI: 10.7522/j.issn.1000-0240.2014.0143, PP. 1199-1204

Keywords: 含盐冻结粉质砂土,广义黏聚力,广义内摩擦角,非线性强度准则

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Abstract:

对含盐冻结粉质砂土进行温度-2℃、-4℃、-6℃和围压0.3~16MPa的三轴强度试验.结果表明含盐冻结粉质砂土应力-应变曲线在低围压和高围压表现为应变软化特征,中围压为理想塑性变形特性;随着围压的增大,强度先增加后减小.在围压小范围内得到广义黏聚力和广义内摩擦角,并得到广义黏聚力和广义内摩擦角随围压和温度的变化规律;同时,针对强度随围压的变化,提出非线性强度准则.

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