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低应力条件下不同密度的南宁膨胀土抗剪强度试验

, PP. 15-21

Keywords: 道路工程,南宁膨胀土,抗剪强度试验,低应力,非线性,干密度

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Abstract:

？为获取浅层坍滑膨胀土边坡滑面的真实抗剪强度,设置不同干密度和低应力条件,用常规直剪仪对南宁膨胀土开展饱和快剪、固结快剪、慢剪和残余剪试验,并对干密度1.7g·cm-3的土样进行干湿循环饱和慢剪试验,系统研究了干密度、试验条件及方法对抗剪强度的影响。结果表明:干密度和应力条件对饱和快剪、固结快剪、慢剪的强度影响显著;低应力下饱和慢剪强度最小;3种抗剪强度线均呈非线性变化,宜用乘幂函数拟合;残余剪与干湿循环慢剪强度值较为接近;与规范法直线回归的残余强度值相比,低应力下的实测值仍小很多。根据该结果提出分析膨胀土坡浅层破坏时,选取土体抗剪强度参数的建议。

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