Experimental Research On The Effect Of Double Row Vibration Isolation Pile On Railway Vibration Isolation

Since entering the 21 st century,China’s scientific and technological strength has developed rapidly,the national economy and productivity are also increasingly meeting people’s living needs.But at the same time,some unnatural vibration caused by the rising buildings and fast and convenient traffic lines during construction and operation,these vibrations have an increasingly significant impact on people’s health and the safety of ancient buildings and time-honored structures,especially in the course of railway vehicles,the wheel-rail contact will produce stronger vibration,these vibrations spread in the form of vibration waves through the medium such as soil.The safety performance of the building structure around the line,some sensitive high-precision instruments and the quality of people’s living and working environment have brought about a noticeable impact.Therefore,it is of great research value to choose effective vibration isolation barrier for a series of vibration effects caused by railway operation.The vibration isolation barrier is a kind of vibration isolation measure which uses to block and absorb the propagation path of vibration wave and to change the propagation direction of vibration wave,and can greatly reduce the vibration grade caused by railway vehicles.According to the structure mode,the isolation barriers are divided into two types: discontinuous isolation barriers and continuous isolation barriers.The discontinuous isolation barriers is composed of a large number of heterogeneous bodies arranged by a certain rule,and its setting style is more diverse,which has great significance for development,utilization and research.Continuous isolation barriers is a coherent whole in 3D space and its setting style is monotonous,and in the actual project,if you want to achieve satisfactory vibration isolation effect,you need better geological conditions to implement,the cost is higher.This paper Based on the research of discontinuous vibration isolation barrier with high utilization value,the vibration isolation effect of double row discontinuous vibration isolation pile is systematically studied by field test.In this paper,a double row discontinuous vibration isolation pile barrier is set up in the sand foundation,construct amplitude consumption rate and corresponding area increase ratio and area percentage,draw a 2D contour map,and the vibration isolation performance of changing the geometric parameter of the double row vibration isolation pile barrier is analyzed and compared from the twodimensional perspective.Under the test conditions,the following conclusions are drawn:First,in respect of the vibration isolation performance of single-row discontinuous barriers:When the pile length is a long pile,the barrier vibration isolation effect is better,and the change of the pile length has a great influence on the area increase ratio under the arrangement of the vibration source directly against the center of the pile;when the pile spacing is large,the overall vibration isolation effect of the barrier is weakened,the vibration isolation effect becomes poor,and the change in the pile spacing has a great influence on the area increase ratio under the arrangement of the vibration source directly facing the center between the piles;when the vibration source distance is small,the vibration isolation barrier has a good vibration isolation effect,and in the two arrangements of the vibration source directly facing the center of the pile and the center of the opposite pile,the influence of the change of the vibration source distance on the area increase ratio is basically no difference.Second,in respect of vibration isolation performance of double-row discontinuous solid pile barriers:With the reduction of the pile spacing,the vibration isolation effect of the pile barrier is gradually enhanced,and when the pile spacing is less than 3.0,it can play a good role in vibration isolation;when the row spacing is 3.0,a better vibration reduction effect can be obtained,and the effective vibration isolation area percentage is 19.52%~68.89%;with the increase of the number of row piles,the effective vibration isolation area of the row pile barrier can be increased,and the area percentage increases by 0.87%~4.74%;the diamond-shaped arrangement of the vibration isolation barrier is better than the rectangular arrangement,and the area percentage increases by 1.20% to 5.01%.Three,in respect of the vibration isolation performance of double-row discontinuous hollow pile barriers:When the normalized pile spacing is 3.0,the amplitude decreases rapidly within a certain range behind the pile barrier,which plays a good role in isolating vibration waves;when the normalized row spacing is 3.0,a better vibration isolation effect can be obtained behind the pile barrier,and the effective vibration isolation area percentage is 7.72%~86.84%;the relatively large inner and outer radius ratio of the pile barrier is better for vibration isolation;the vibration isolation barrier in the form of a diamond is better than that in a rectangular arrangement,and the area percentage increases by 1.01% to 14.58%.