粉煤灰地层液化特性试验研究

Experimental study on liquefaction characteristics of fly ash stratum

为了探究粉煤灰地层在振动荷载作用下的液化特性,采用基于小型振动台的室内模型试验,模拟自由场在地震作用下的振动反应,探讨饱和粉煤灰地层的液化判别方法。试验结果表明:粉煤灰地层在振动荷载作用下会发生类似流体的液化现象,孔隙水压力随着埋深的增加而增大,而孔压比随着埋深的增加而减小,不同埋深处土层的孔压比在试验结束后都已经达到1.0或更高值,说明此时粉煤灰地层已经完全液化,研究结果可以为工程中有效利用粉煤灰提供参考。

To investigate the liquefaction characteristics of fly ash strata under vibration loading,indoor model tests based on a small shaking table are used to simulate the vibration response of the free field under seismic action and to explore the liquefaction discrimination method of saturated fly ash strata.The test results show that the fluid-like liquefaction occurs in fly ash stratum under the vibration load.The pore water pressure will increase with the increase of buried depth,and the pore pressure ratio will decrease with the increase of buried depth.The pore pressure ratios of the soil layers at different buried depths have reached 1.0 or higher after the end of the test,indicating that the fly ash stratum has been completely liquefied at this time.The research results can provide reference for the effective use of fly ash in the project.