本文選題：現(xiàn)場測試 + 基底圍巖��； 參考：《北京交通大學(xué)》2017年碩士論文

【摘要】：我國山嶺隧道病害現(xiàn)象嚴重,其中尤以隧道基底病害為甚。據(jù)調(diào)查,列車荷載的往復(fù)振動沖擊作用是造成基底病害產(chǎn)生的主要原因之一。而隨著我國貨運需求的日益增加,有關(guān)部門將逐漸增加既有鐵路的貨運列車行車密度或軸重。但是這種改變將導(dǎo)致隧道基底圍巖直接承受列車荷載的振動沖擊力增大,進而加劇隧道基底病害的產(chǎn)生及發(fā)展。另外一方面,重載貨運線路建設(shè)過程中,關(guān)于有砟/無砟道床的選型也一直存在爭議。為了解決這些問題,需要專門研究列車振動在隧道及基底圍巖中的傳播規(guī)律,軸重、車速等參數(shù)的影響規(guī)律,以及有砟/無砟兩種道床型式下基底圍巖中振動傳播規(guī)律的差異,為隧道基底病害的防治、以及道床選型提供參考。本文以神朔線霍家梁隧道為工程背景,綜合運用資料調(diào)研、現(xiàn)場測試、數(shù)值分析等手段,分析了軸重、基底病害對鋼軌、軌枕、隧道壁及圍巖的影響規(guī)律,并進一步對比分析了有砟、無砟兩種軌道型式下,不同軸重及車速條件下隧道基底圍巖的動力響應(yīng)規(guī)律。主要工作內(nèi)容及結(jié)論如下:1、在霍家梁隧道內(nèi)進行振動測試,獲取軌道及隧道結(jié)構(gòu)振動實測數(shù)據(jù),分析不同軸重列車經(jīng)過正常(無病害)、病害斷面時軌道及隧道結(jié)構(gòu)的振動響應(yīng)特性。結(jié)果表明:隧道基底振動響應(yīng)隨軸重增加而增大,其中10Hz以下、50-1000Hz頻段更為明顯;軸重的增加使軌枕振動響應(yīng)在2-200Hz頻段內(nèi)增大,使鋼軌振動響應(yīng)在1-50及70-500Hz頻段內(nèi)增大;基底病害導(dǎo)致基底、隧道壁、軌枕的振動響應(yīng)均有所增大,在頻域上這三處響應(yīng)的明顯增大頻段分別為150-400Hz、100-330Hz、10-200Hz。2、根據(jù)霍家梁隧道實際情況建立軌道-隧道-土體三維動力有限元模型,利用實測數(shù)據(jù)對模型單元劃分方法、邊界處理等進行校核,獲得了可以準確分析基底圍巖振動響應(yīng)的模擬實際工況的三維動力有限元模型,進而采用該模型對霍家梁隧道基底圍巖振動影響范圍進行分析,結(jié)果表明:振動在基底圍巖中呈現(xiàn)以隧道重載側(cè)軌道中心下方為中心向四周衰減的趨勢;27t軸重列車對基底圍巖的振動影響范圍為10m;確定了采用圍巖豎向應(yīng)力及振動加速度有效值兩個指標進行后續(xù)研究。3、采用上述建模方法分別建立有砟、無砟兩種軌道型式下的軌道-隧道-土體三維動力有限元模型,對比分析有砟、無砟兩種軌道型式下,軸重、車速等因素對基底圍巖動力響應(yīng)的影響規(guī)律。結(jié)果表明:對于基底圍巖相同位置處,有砟軌道工況的基底圍巖豎向應(yīng)力及加速度有效值均小于無砟軌道,且隨軸重的增加,無砟軌道型式下基底圍巖加速度有效值及豎向應(yīng)力峰值的增加量比有砟軌道型式下的更敏感,因此從列車振動角度考慮,在同等圍巖等級地段修建重載鐵路應(yīng)優(yōu)先采用有砟軌道;隨軸重增加,有砟、無砟軌道下基底圍巖的豎向應(yīng)力及加速度有效值均隨之增加,即基底圍巖發(fā)生病害的可能性也將提高。
[Abstract]:Mountain tunnel disease is serious in China, especially in tunnel base.According to investigation, reciprocating vibration impact of train load is one of the main causes of foundation disease.With the increasing demand of freight transportation in China, the relevant departments will gradually increase the train density or axle load of the existing railway.However, this change will lead to the increase of vibration impact force of the surrounding rock of the tunnel foundation directly under train load, which will further aggravate the generation and development of the tunnel foundation disease.On the other hand, the selection of ballastless / ballastless bed has always been controversial in the construction of heavy haul freight lines.In order to solve these problems, it is necessary to study the propagation law of train vibration in tunnel and surrounding rock, the influence law of axle load, speed and so on, and the difference of vibration propagation law between the two types of ballast and ballastless roadbed.It provides a reference for the prevention and treatment of tunnel foundation disease and the selection of the road bed.Taking the Huojialiang tunnel of Shenshuo line as the engineering background, this paper analyzes the influence of axle load and foundation diseases on rail, sleeper, tunnel wall and surrounding rock by means of comprehensive application of data investigation, field test and numerical analysis.Furthermore, the dynamic response of the surrounding rock of the tunnel foundation under different axle loads and speeds is compared and analyzed under the ballastless and ballastless track types.The main contents and conclusions are as follows: 1. Vibration test is carried out in Huo Jialiang Tunnel, and the measured data of track and tunnel structure vibration are obtained.The vibration response characteristics of track and tunnel structure of different axle load trains passing through normal (disease-free and diseased section) are analyzed.The results show that the vibration response of the tunnel base increases with the increase of the axial load, and the vibration response of the sleeper increases in the 2-200Hz frequency band and the rail vibration response in the 1-50 and 70-500Hz frequency bands with the increase of the shaft load, especially in the 50-1000Hz frequency band below 10Hz.The vibration response of the basement, tunnel wall and sleeper is increased with the frequency range of 150-400 Hz ~ (-1) ~ (100) ~ (30) Hz ~ (10 ~ (-200)) Hz 路2, respectively. According to the actual situation of Huojialiang Tunnel, a three-dimensional dynamic finite element model of rail-tunnel and soil is established.By using the measured data to check the method of model element partition and boundary treatment, a three-dimensional dynamic finite element model is obtained, which can accurately analyze the vibration response of surrounding rock in the basement.Furthermore, the model is used to analyze the influence range of surrounding rock vibration on the foundation of Huojialiang Tunnel.The results show that the vibration in the surrounding rock of the basement shows a trend of attenuation around the center below the center of the heavy load side track of the tunnel. The influence range of the axle load train of 27t on the vibration of the surrounding rock is 10 m, and the vertical stress and vibration of the surrounding rock are determined.The dynamic acceleration effective value two indexes carry on the follow-up research. 3, uses the above modeling method to establish the ballast. respectively,Three-dimensional dynamic finite element model of track-tunnel-soil in ballastless two types of track is analyzed, and the influence of axle load and speed on the dynamic response of surrounding rock is compared and analyzed in ballastless and ballastless two kinds of track.The results show that the vertical stress and acceleration of the ballast track are smaller than those of the ballastless track at the same position, and with the increase of axle load, the vertical stress and acceleration of the ballast track are lower than that of the ballastless track.The effective value of the acceleration and the increase of the peak vertical stress of the base surrounding rock under ballastless track type are more sensitive than those under the ballastless track type, so considering from the view of train vibration,The ballasted track should be preferred to be used in the construction of heavy-haul railway in the same surrounding rock grade, and with the increase of axle load, the vertical stress and the effective acceleration of the surrounding rock of the foundation under the ballastless track will increase with the increase of axle load.In other words, the possibility of disease in the surrounding rock of the basement will also be increased.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U451.2

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