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现有的分层抽取法不能测试沉积过程中淤泥强度的变化,并且需要使用较多的孔隙水应力传感器导致试验成本很高。因此对此方法进行了改进,主要有研制了可测试强度极低淤泥的室内微型高精度十字板剪切仪和一个孔隙水应力传感器切换测试沉积柱不同高度处孔隙水应力的装置。由试验结果可知实测的数据完全满足需要,证明此方法是可行的。利用改进的分层抽取法可得到淤泥沉积过程中的泥水分界面高度、含水率(密度)、超静孔隙水应力、有效应力、颗粒分布、强度、压缩性、渗透性等参数的变化规律,可研究时间尺度较大的沉积淤泥的大变形自重固结和强度问题,并为进一步进行大变形自重固结的数值模拟提供了基础。
The existing stratified extraction method can not test the change of sludge intensity during deposition, and requires more pore water stress sensors to lead to high test costs. Therefore, this method has been improved, mainly to develop a device that can test the pore water stress at different heights of the sedimentation column by testing the indoor miniature high precision cross-cut shears and the pore water stress sensor which can test the silt with extremely low strength. The experimental results show that the measured data fully meet the needs of this method is feasible. By using the improved stratified extraction method, the variation law of parameters such as the height of the muddy water interface, the moisture content (density), the excess pore water stress, the effective stress, the particle distribution, the strength, the compressibility and the permeability can be obtained. It is possible to study the problem of large deformation, self-weight consolidation and strength of sediment with a large time scale and provide a basis for further numerical simulation of large deformation and self-weight consolidation.