上海地区饱和软黏土触变特性试验研究

Laboratory Studies on Thixotropy of Saturated Soft Clay in Shanghai

采用室内微型十字板剪切试验对上海两种含水量(w=45.45%,w=34.93%)的饱和软黏土的触变特性进行了研究。结果表明,两种含水量的软黏土重塑扰动后,在触变恢复初期强度增长速度较快,7天后强度恢复速率明显变缓。上海饱和软黏土不是完全触变材料,触变性是其具有高灵敏性的原因之一,其中低水量土样触变性对其灵敏性的贡献明显大于高含水量土样。

Thixotropic action of saturated soft clay in Shanghai under two water content(w=45.45%,w=34.93%)were investigated by laboratory mini-vane shear tests.According to the test results,the rate of thixotropic regains in the early period of age-hardening was high,and then slowed down obviously after 7 days.Saturated soft clay in Shanghai is not a complete thixotropic material.Thixotropy is one of the important reasons for its high sensitivity.The thixotropy of low water content soil contributes significantly to its sensitivity than the high water content soil.