砂袋垫层抗液化性能振动台试验研究

Vibration Table Experimental Study on Anti-liquefaction Performance of Sandbag Layer

结合自制水平向振动台和足尺砂袋垫层,试验研究了砂袋垫层的抗液化性能及其影响因素,并与传统砂垫层做了比较。试验结果表明:1)砂袋垫层与砂垫层的孔隙水压力,在陡增时刻和变化趋势方面均相同,但砂袋垫层因内部颗粒不易松散,具有明显抗液化性能;2)砂袋垫层所处位置越深时,包装袋约束作用更强,其抗液化性能越好;3)砂袋尺寸越大时,越靠近中部和顶部位置,包装袋的约束作用越小,孔隙水压力增长越快且越接近临界状态;4)砂袋垫层抗液化性能与包装袋的防水性能无关,外部孔隙水压增加时,对内部基本无影响。

The self-made horizontal vibration table is combined with full-size sandbag layer to test the anti-liquefaction performance of sandbag layer and the influencing factors.In comparison with the traditional sand layer,the results show that①The pore water pressure of sandbag layer is same as that of sand layer in terms of sharp increase time and the trend.However,the sandbag layer has absolute anti-liquefaction performance since sand particles are not easy to loosen;②The deeper position of sandbag layer leads to stronger restraining effect of packing bags and better anti-liquefaction performance;③Larger sandbag results in less restraining effect at the middle and top of packaging bag,and the pore water pressure will be much closer to the critical state subject to its higher increasing speed;④The anti-liquefaction performance of sandbag layer has nothing to do with the waterproof performance of packing bag,and the increase of pore water pressure has little effect on the internal situation.