非饱和盐渍土三轴蠕变试验与模型分析

Yu Yunyan,Luo Chongliang,Wang Kun,Yue Jianping,Gao Chun, Tian Xiaopeng, Zhang Ruicheng, Xue Peng

Journal of Southeast University(Natural Science Edition)(2022)

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Abstract
为研究非饱和盐渍土的蠕变行为,开展了一系列三轴固结不排水蠕变试验,分析了不同加载应力、含盐量及压实度下的蠕变特性,并采用修正前、后的Singh-Mitchell蠕变模型对非饱和盐渍土蠕变行为进行预测.结果表明:蠕变曲线呈三阶段发展,稳态蠕变阶段的蠕变速率趋于0;应力应变等时曲线呈非线性的曲线簇由密向疏发展,长期强度在100~150 kPa范围内,为瞬时强度的0.39~0.73倍;加载应力、压实度、w(NaCl)对其蠕变特性有显著影响;修正后的Singh-Mitchell蠕变模型不仅克服了原Singh-Mitchell蠕变模型的应力局限性,还可有效预测非饱和盐渍土三轴蠕变行为.
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