软土的振动排水固结特性试验研究

以江苏镇江某现场软土为研究对象,室内利用自主设计的动态固结渗透仪模拟饱和软土在振动荷载作用下的响应。在不同排水条件、围压、静荷载、振动荷载和频率下进行排水固结试验,并同单一的静压排水固结试验进行对比,重点分析试验过程中的动应变和固结排水效应,探讨软土的动力固结排水机理。试验结果表明,振动作用可以明显地提高排水速度,增加排水量;固结压力、振动荷载和频率对软土的振动排水效应产生显著的影响。试验结果和振动排水的机理分析,对当前软土地基处理及其施工工艺设计具有重要的实用价值和指导意义。

Laboratory tests on consolidation behavior of soft soils under vibration drainage conditions

The consolidation characteristics of soft soils taken from one site in Zhenjiang City under vibration drainage conditions are investigated. A series of laboratory tests are conducted on the saturated soft soils by using the self-developed dynamic consolidation oedometer. The dynamic consolidation tests are carried out considering the effects of different static loads, confining pressures, vibration loads and frequencies and they are compared with hydrostatic consolidation tests. The dynamic response of strain and consolidation drainage during the tests are focused, and the drainage mechanism is thereafter analyzed. The test results indicate that the vibration process can significantly improve the drainage speed and increase the displacement of consolidation. The drainage for soft soil is evidently affected by the confining pressure, vibration load and frequency. The analysis of tests results and its mechanism is of great importance and practical value for improving the existing foundation treatment techniques.