不同埋置深度对桩的隔振效果的研究

Research on the Vibration Isolation Effect of Piles with Different Embedded Depths

为了研究桩的埋置深度对桩隔振效果的影响,本试验通过控制变量法,研究了埋置深度对桩隔振效果的影响。在本试验条件下得出以下结论:混凝土的桩能够有效的隔离振动波。随着振源距的增大,振幅降低比Ar值逐渐减小,隔振效果显著,但距离增大到一定值后,振幅降低比Ar值逐渐增大,隔振效果减弱;不同埋深的最佳隔振区域都在控制点与振源中心60cm-80cm之间。埋深5cm时,隔振最优区域的Ar值分布在0.612~0.640之间;埋深100mm时,隔振最优区域的Ar值分布在0.736~0.769之间;埋深150mm时,隔振最优区域的Ar值分布在0.822~0.834之间,随着埋深的增大,最优隔振区域的Ar值增大,隔振效果减弱。埋深从150mm降到100mm时,振幅降低比Ar值的幅值降低10%,隔振效果增强10%,埋深从100mm降到50mm时,振幅降低比Ar值的幅值降低20%,隔振效果增强20%,说明埋深越小,隔振效果越好。

In order to study the influence of the embedded depth of the pile on the vibration isolation effect of the pile,the influence of the embedded depth on the vibration isolation effect of the pile is studied by the control variable method.Under the test conditions,the following conclusions are drawn:the concrete pile can effectively isolate the vibration wave.With the increase of the vibration source distance,the amplitude reduction ratio Ar value gradually decreases,and the vibration isolation effect is significant,but when the distance increases to a certain value,the amplitude reduction ratio Ar value gradually increases,and the vibration isolation effect weakens;the best vibration isolation areas of different buried depths are between the control point and the vibration source center of 60 cm-80 cm.When the buried depth is 5 cm,the Ar value of the optimal vibration isolation area is 0.612~0.640;when the buried depth is 10 cm,the Ar value of the optimal vibration isolation area is 0.736~0.769;when the buried depth is 15 cm,the Ar value of the optimal vibration isolation area is between 0.822~0.834.With the increase of the buried depth,the Ar value of the optimal vibration isolation area increases,and the vibration isolation effect decreases.When the buried depth is reduced from 15 cm to 10 cm,the amplitude reduction is 10%lower than that of Ar value,and the vibration isolation effect is enhanced by 10%.When the buried depth is reduced from 10 cm to 5 cm,the amplitude reduction is reduced by 20%compared with that of Ar value,and the vibration isolation effect is enhanced by 20%.