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近来数次大地震中出现大量的砂砾土液化震害,饱和砂砾土的地震液化问题越来越引起重视。针对砂砾土的抗液化强度问题,开展了4种砾含量、3种相对密度情况下,饱和砂砾土的小型土箱振动台试验研究。为获得较为合理的抗液化强度结果修正了由加速度计倾斜产生的加速度时程漂移,并描述了土体中加速度和动孔压发展特性。饱和砂砾土的抗液化强度结果显示:含砾量和相对密度对饱和砂砾土的抗液化强度均有明显影响。饱和砂砾土的抗液化强度随着含砾量和相对密度的增加明显增大,增大的趋势越来越明显,且明显高于相近相对密度的饱和砂土的抗液化强度。
Recently, a large number of large-scale earthquake liquefaction of gravel soil occurred in several large earthquakes, and seismic liquefaction of saturated gravel soil has drawn more and more attention. In order to solve the liquefaction resistance of gravel soil, four kinds of gravel tests were carried out on shale soil with saturated gravel soil under three relative densities. In order to obtain a more reasonable anti-liquefaction strength, the time-history of acceleration due to the tilt of accelerometer is corrected and the acceleration and the characteristics of dynamic pressure and pore pressure in soil are described. The results of liquefaction resistance of saturated gravel soil show that both gravel content and relative density have a significant effect on liquefaction resistance of saturated gravel soil. The liquefaction resistance of saturated gravelly soil increases with the increase of gravel content and relative density, and the increasing trend becomes more and more obvious, which is obviously higher than the liquefaction resistance of saturated sands with similar relative density.