海水环境下高含水率疏浚泥不排水强度特性研究

The Undrained Shear Strength Behavior of Dredged Slurries at High Water Content in Seawater Environment

通过采用高精度的十字板测试仪开展不同盐度下疏浚淤泥不排水强度试验,探讨盐度对疏浚淤泥不排水强度的影响规律,明确海水环境下疏浚淤泥的不排水强度特性。试验成果表明,海水环境下,高含水率疏浚泥的破坏方式可分为应变硬化形和应变软化型两种。盐度对疏浚泥不排水强度的影响程度随土样液限的增加而增加,盐度小于2%时,疏浚泥不排水强度随盐度的增加而降低较大,盐度大于2%时,疏浚泥不排水强度随盐度的增加变化较小。最后,将海水环境下疏浚泥的液限作为归一化参数归一化疏浚泥的不排水强度,并获得海水环境下高含水率疏浚泥不排水强度的预测公式。

Dredged slurry undrained strength test with high precision cross board test instrument was conducted when the salinity is different. This test is aiming to find how the salinity affects the undrained strength and to ex- plore the characteristic of the undrained strength for dredged slurry. The finding of the experiment is that the failure mode of the dredged slurry with high water content can be divided into strain hardening and strain softening in the seawater environment. And also, the salinity will have greater influence to the undrained strength when liquid limit is getting higher. By doing the experiment, it＇ s been found that the undrained strength decrease more significant if the salinity is lower than 2%. Finally, in the ocean, the dredged slurry＇ s undrained strength can be normalised with its liquid limit and the undrained strength predicting formula will be achieved.