【摘要】：軌道交通引起的環(huán)境振動(dòng)問題越來越突出,已成為七大環(huán)境公害之一。國內(nèi)外學(xué)者已在環(huán)境振動(dòng)方面開展了大量的研究,并取得了豐富的研究成果,但這些研究成果還不能完全解決實(shí)際工程中的振動(dòng)問題。本文在研究環(huán)境振動(dòng)理論的基礎(chǔ)上結(jié)合現(xiàn)場(chǎng)實(shí)測(cè)的方法對(duì)成灌快速鐵路橋梁段引起的環(huán)境振動(dòng)進(jìn)行研究,以進(jìn)一步了解其環(huán)境振動(dòng)特性。 首先對(duì)正線橋梁段三處測(cè)點(diǎn)地面的環(huán)境振動(dòng)進(jìn)行實(shí)測(cè),分析各測(cè)點(diǎn)的振動(dòng)變化規(guī)律并歸納出振動(dòng)衰減公式,初步揭示成灌快速鐵路橋梁段的環(huán)境振動(dòng)特性。其次,運(yùn)用本文歸納的衰減公式、鐵計(jì)[2010]44號(hào)文中推薦的模式法預(yù)測(cè)公式、日本京都公害研究所提出的預(yù)測(cè)公式對(duì)成灌快速鐵路橋梁段的環(huán)境振動(dòng)進(jìn)行預(yù)測(cè),比較各預(yù)測(cè)公式計(jì)算出的預(yù)測(cè)值與實(shí)測(cè)值的相符度,依據(jù)符合度選出較適合成灌快速鐵路橋梁段的環(huán)境振動(dòng)預(yù)測(cè)公式。本文的主要研究結(jié)論如下： 1.從各振動(dòng)測(cè)試指標(biāo)的變化趨勢(shì)可知：隨著距線路中心距離的增加,振級(jí)、振動(dòng)加速度均在迅速減小,且在衰減過程中,近振源處的衰減速度大于遠(yuǎn)振源處的衰減速度。 2.從1/3倍頻程曲線、頻譜曲線的變化趨勢(shì)可知：近振源處高頻占主導(dǎo)作用,遠(yuǎn)振源處低頻占主導(dǎo)作用,高頻部分的衰減速度大于低頻部分的衰減速度；振動(dòng)主頻范圍、最優(yōu)頻率、振動(dòng)幅值均隨距離的增加而逐漸減小。成灌快速鐵路橋梁段環(huán)境振動(dòng)的主要能量集中在10-63Hz之間。 3.對(duì)比全福村Y型墩測(cè)點(diǎn)內(nèi)外線的時(shí)程曲線和頻譜曲線可知：列車速度的增加會(huì)引起環(huán)境振動(dòng)的增加。 4.環(huán)境振動(dòng)衰減趨勢(shì)分析結(jié)果表明,各測(cè)點(diǎn)環(huán)境振動(dòng)基本以指數(shù)規(guī)律衰減。預(yù)測(cè)結(jié)果表明,本文衰減公式的符合度較好,鐵計(jì)[2010]44號(hào)文中的模式預(yù)測(cè)公式符合度次之,日本京都公害研究所的符合度最低。因此,相比其他兩種預(yù)測(cè)方法,本文歸納出的衰減公式最適合成灌快速鐵路橋梁段的環(huán)境振動(dòng)預(yù)測(cè)。
[Abstract]:The problem of environmental vibration caused by rail transit is becoming more and more prominent, which has become one of the seven environmental hazards. Scholars at home and abroad have carried out a lot of research on environmental vibration, and have made a wealth of research results, but these research results can not completely solve the vibration problem in practical engineering. In this paper, on the basis of studying the theory of environmental vibration and the method of field measurement, the environmental vibration caused by the bridge section of high speed railway is studied in order to further understand the characteristics of environmental vibration. Firstly, the environmental vibration of the ground at three measuring points in the main line bridge section is measured, the vibration variation law of each measuring point is analyzed, and the vibration attenuation formula is summarized, and the environmental vibration characteristics of the bridge section of the high speed railway are preliminarily revealed. Secondly, the attenuation formula summarized in this paper, the model method prediction formula recommended in iron meter [2010] 44, and the prediction formula proposed by Kyoto pollution Research Institute of Japan are used to predict the environmental vibration of the bridge section of Chengdu-irrigation fast railway. The predicted values calculated by each prediction formula are compared with the measured values, and the environmental vibration prediction formula suitable for the bridge section of Chengdu-irrigation fast railway is selected according to the coincidence degree. The main conclusions of this paper are as follows: 1. From the changing trend of each vibration test index, it can be seen that with the increase of the distance from the center of the line, the vibration level and vibration acceleration decrease rapidly, and in the process of attenuation, the attenuation speed near the vibration source is greater than that at the far vibration source. two銆，

本文編號(hào)：2507106