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针对目前在进行三轴CD试验时对土体固结稳定的判断没有统一标准的问题,利用试验手段,选用工程中常见的粘性土通过GDS三轴试验系统进行了三轴CD试验,试验过程中分别采集土样在不同荷载下的孔压和位移数据,并分析其随时间的变化规律,进而对实现三轴试验稳定控制的孔压、时间、位移等3种判断标准进行了讨论,在总结3种判断标准优缺点的基础上,提出了相对位移控制标准,即根据某级荷载下某段时间内的位移量对此级荷载下总位移量的贡献程度来决定试验的进度,该方法相对其它稳定判断标准更具科学性。
Aiming at the problem that there is no uniform standard to judge the soil consolidation stability when carrying out the three-axis CD test at present, the triaxial CD test is conducted by the GDS triaxial test system by using the test means and the common clay in the project. During the test The pore pressure and displacement data of soil samples under different loads were collected and their variation with time were analyzed respectively. Then, three judgment criteria of pore pressure, time and displacement for the stable control of triaxial tests were discussed. Based on the advantages and disadvantages of the three criteria, the relative displacement control standard is put forward, that is, the progress of the test is decided according to the contribution of the displacement within a certain period of time to the total displacement at this stage of load. Other criteria for stability are more scientific.