Theoretical Research And Numerical Analysis Ot The In-tilled Trench For Vibration Caused By Moving Train

Environmental pollution problems caused by vibration induced by the operation of the train are more and more serious with the advent of the era of railway great speed up and urban rail railway construction peak.This continuous vibration interference on the residents along the life,work has brought great inconvenience.It has also caused a large degree of impact on the safety of the surrounding buildings,especially the ancient buildings and the use of precision instruments and equipment.Therefore,it is of great significance to study the ground vibration caused by train operation and how to reduce the influence of vibration hazard.In this paper,the propagation of vibration wave in soil medium and the principle of continuous barrier isolation are discussed.From the derived Rayleigh wave reflection,transmission coefficient in the in-filled trench barrier to start,Combined with the Equivalent and Extraction of Track Reaction Force when Train Operation,the theoretical response of the ground vibration caused by the operation of the train under the condition of in-filled trench isolation has been derived.And the influence of the parameters of the in-filled trench(trench width,trench depth,trench position and filling material)on the vibration isolation effect is analyzed theoretically.we have got some practical rules for the project.In order to verify the validity of the theoretical derivation,a soil-infilled trench model is established,and we load the same train vibration source excitation.The numerical results are compared with the theoretical results,and the applicability of the formula is verified.The influence of the parameters of the in-filled trench on the vibration isolation effect is numerically simulated,which is consistent with the trend of theoretical calculation.This paper also discusses in particular the response of the model to ground vibration under different contact conditions(coordinated and elastic contact).The main research results obtained in this paper are as follows:(1)The most important factor affecting the vibration effect of the in-fill trench is the filling material properties.The greater the difference between material and soil,vibration isolation effect is good,otherwise the vibration effect is worse.In this paper,the vibration effect of foam board is the best,sand and gravel vibration isolation effect is the worst.(2)The width of the in-filled trench has an effect on the vibration isolation effect.The larger the width,the ground level has a certain decline,But the width of the choice to the cost of construction and land conservation within the scope of comprehensive consideration.(3)The depth and position of the in-filled trench have little effect on the vibration isolation effect of the in-filled trench.However,considering the vibration wave diffraction should be reduced as much as possible in the trench,the depth of the in-filled trench can be set as the Rayleigh wavelength.(4)In the numerical simulation,consider the elastic contact between the soil and the in-filled trench can be more realistic response of the dynamic interaction between them.This is more in line with the real vibration...