Abstract: The newly filled silt has the characteristics of high water content and low permeability, and the shear strength is very low. In order to study the influence of deposition time on the shear strength of the dredged silt in the yard, the deposition process of silt in the yard was simulated by a settlement column. 3 groups of tests of indoor sedimentation columns at different time were carried out, and the micro-cross plate was used to carry out the undrained strength test after reaching the set deposition time. The test results show that: under the influence of deposition time, the undrained strength increases with the increase of the deposition time in the case of the same water content; under the influence of the initial water content, the undrained strength-effective stress curve shows a shape of concave, which is inconsistent with the linear relationship considered in general case.

Key words: geotechnical engineering, silt, weight deposition, undrained strength, deposition time

摘要： 新近吹填淤泥具有高含水率、低渗透性等特点，且剪切强度极低。为深入研究吹填淤泥在堆场中沉积时间对剪切强度的影响，采用沉降柱模拟淤泥 在堆场中的沉积过程，进行了3组不同时间的室内沉降柱沉积试验，达到设定沉积时间后用微型十字板进行不排水强度测试。实验结果表明：受沉积时间 影响，在含水率相同条件下，不排水强度随沉积时间增长而增大；受初始含水率影响，不排水强度-有效应力曲线呈上凹状，与一般情况认为的线性关系 不一致。

关键词: 岩土工程, 堆场淤泥, 自重沉积, 不排水强度, 沉积时间