原状粉质黏土抗剪强度的恢复试验研究

利用静力三轴仪对长春地区原状土进行固结不排水抗剪强度试验，根据摩尔强度理论得出原状土的抗剪强度指标c和φ值。然后加入不同含量的氯化钙、明胶及氯化钙、明胶组合剂，对扰动土进行重塑，分别得出与原状土强黏聚力明胶含量，与原状土内摩擦角氯化钙含量，以及原状土黏聚力和内摩擦角两者添加剂组合含量，并分析黏聚力和内摩擦角影响因素和加入添加剂重塑土抗剪强度变化的原因。研究结果表明:含1%明胶、7%氯化钙重塑土黏聚力和内摩擦角与原状土基本拟合。

Experimental Study on Shear Strength Restoration of Undisturbed Silty Clay

The paper, according to the consolidated-undrained shear strength test on the undisturbed soil in Changchun area, obtained the shear strength indicators thereof, i.e.c and φ values, on the basis of Mohr-Coulomb strength theory; then by remodeling of disturbed soil added with calcium chloride, gelatin, and combination of calcium chloride and gelatin in different contents, found out the gelatin content for fitting of undisturbed soil’s cohensive force, the calcium chloride content for fitting of undisturbed soil’s internal friction angle, and the content of additives combination, respectively; moreover, analyzed the factors influencing the cohensive force and internal friction angle, and why the shear strength of remoulded soil changes with addition of additives. The results shows that the cohensive force and internal friction angle of remoulded soil, which inlcudes 1% gelatin and 7% calcium chloride, is almost the same as those of undisturbed soil.