Research On The Vibration Isolation Performance Of A New Type Of Trench

The first railway in China was the Songhu Railway built in 1876.The first subway line in China was Beijing Line 1 which was closed for trial operation in 1971.The first high-speed railway in China was the Qin-Shen Passenger Line opened in 2003.From the opening of the first ordinary railway to the subway and the continuous operation of the high-speed railway,China’s railway business has flourished along with economic growth and has brought great convenience to daily travel and cargo transportation.The important part.At the same time,it also brings some inconveniences.The vibration generated by the railway can cause damage to surrounding buildings,cause discomfort to surrounding residents,and affect the sensitivity of precision instruments.Based on the vibration problems caused by railways,this paper uses vibration isolation trenches to study vibration problems.Based on the propagation characteristics of waves in soil,the principle of trench barrier vibration isolation,and the explicit algorithm of ABAQUS,this paper studies the subject.Using ABAQUS software to establish the vibration source-soil layervibration isolation trench model.This article mainly carried out the following aspects of research work:1.Consult a large number of relevant domestic and foreign literatures,focusing on the introduction of ABAQUS explicit algorithm,wave propagation characteristics in soil,and principle of trench barrier vibration isolation.2.Use ABAQUS software to establish the vibration source-soil layer-isolation trench model,analyze the isolation effects of materials such as bentonite,rubber,water,polystyrene foam,etc.,and focus on the analysis of the acceleration,velocity,and displacement responses of the soil after the trench.Styrene is the best vibration isolation material.3.Comparing the vibration isolation effect of polystyrene foam-filled trenches and empty trenches,the results show that the vibration isolation effect of empty trenches is better.Based on this comparison,rectangular empty trenches,trapezoidal empty trenches,stepped empty trenches,and V-shaped hollow The vibration isolation effect of the trench is compared with the acceleration,velocity,and displacement responses of the soil particles after the trench.The results show that the vibration isolation effect of the empty trench is V-shaped trench> trapezoidal trench> rectangular trench> stepped trench.4.From the vibration source frequency,different soil materials,distance from the left side of the trench to the source,the width of the trench,the depth of the trench,and the angle of the trench,the impact of the V-shaped hollow trench on the vibration isolation effect is further developed.The results show that the distance between the empty trench and the source,the width of the trench,and the different physical properties of the soil have little effect on the vibration isolation performance of the empty trench.The smaller the vibration source excitation frequency,the better the isolation effect of the V-shaped empty trench;The better the deep vibration isolation effect;the closer the reflection angle is to the ground floor,the better the vibration isolation effect is.