中文摘要：

直剪试验是测定土体抗剪强度常用的方法。通过对重塑上海第4层淤泥质粘土分别进行固结快剪和慢剪试验, 对慢剪和快剪的剪应力和剪切位移曲线以及慢剪和快剪的抗剪强度曲线进行分析，并对其剪应力与剪切位移关系曲线进行归一化分析，拟合得到各竖向压力下的归一化方程，进而统一了各竖向压力下t/P·S-S的归一化方程，并通过抗剪强度曲线图可得到抗剪强度参数粘聚力（c）和内摩擦角（j）；抗剪强度和剪切破坏时与剪切面上的含水率有较好的线性关系。

英文摘要：

In this paper, fourth silt clay in Shanhai was remolded to carry out experiment of direct shear, namely consolidation quick shear and slow shear, the curves of shear stress and shear strength were analyzed in summary. The normalized curves of its shearing stress and shear displacement were also analyzed, and the normalization equation was obtained, the relations between shear strength and water content of the shearing failure were discussed.