一种模拟液化后的砂土在高孔压比状态下流动特性的试验方法研究

Study on a Type of Test Method Simulating the Flow Characteristics of Liquefied Sand under the Condition of High Pore Pressure Ratio

根据流体力学中的绕球定常黏性流动理论,在传统振动台试验的基础上,设计了一套模拟液化砂土高孔压比状态下流动特性的试验装置,在装有与氯化钠溶液混合的塑料砂的模型箱中埋入可以竖直滑动的有机玻璃半球,半球在其中竖直运动时可以模拟出半球在液化砂土中的运动,可以观察半球运动过程中塑料砂颗粒的运动特性。试验结果表明,本方法可以有效地做到模拟砂土液化后的力学状态,并且性质稳定,可以较好地获得砂土液化后的流动特性。

According to the theory of dropping ball viscosimeter,the test apparatus simulating the flow characteristics of liquefied sand under the condition of high pore pressure ratio is developed based on the traditional shaking table tests. An organic glass half-sphere, embedded in the model box with the mixture of plastic sand and sodium chloride solution, can be moved in the longitudinal direction when the soil liquefaction is simulated, so that the flow characteristics of plastic sand when the half-sphere is moving can be observed. The test result shows that this method can effectively simulate the mechanical state of liquefied sand,and the properties are stable, thus the flow characteristics of liquefied sand can be better obtained.