渗透固结试验装置的改进

针对传统固结仪不能进行渗透试验的不足,对固结仪进行了改装。改装后的固结仪不仅可以交叉进行固结、渗透试验,以研究不同荷载作用下土样的渗透特性,而且可以通过三通阀控制排水条件,进行双面排水固结试验,或在单面排水条件下量测固结过程中试样不排水面处的孔隙水压力,也可通过串联固结仪分别研究试样不同截面处孔隙水压力的消散规律。新仪器具有构造简单,密封性能好的特点。通过与常规固结、渗透试验的结果对比,验证了采用改装固结仪测定固结模型参数的可靠性。另外,通过单面排水固结试验发现了孔压滞后现象。

The Improvement of Osmotic Oedometer

Traditional oedometer was improved due to its shortage (permeability test can't be carried out on it). After improvement, the consolidation tests and permeability tests can be successively carried out to study the permeability characterics of the soil specimen under different loads. By controlling the drainage through a three-way valve, both double drainage test and single drainage test can be conducted, and not only pore water pressure at the bottom of soil specimen can be measured, but also pore water pressure on the different section can be measured respectively by the inter-connected consolidation apparatus. The improved apparatus has some merits, such as simple conformation and good watertight behavior. Comparing with traditional consolidation test and permeability test, its application to some tests gives more reasonable results. In addition, a phenomenon was found by he single drainage test, that the pore pressure from the bottom of specimen often delays.