本文選題：輕軌隧道 + 爆破地震效應(yīng)��； 參考：《湖南科技大學(xué)》2015年碩士論文

【摘要】：隨著我國交通基礎(chǔ)建設(shè)的蓬勃發(fā)展,在多山和丘陵地區(qū)修建高速公路,高速鐵路,在城市中修建輕軌已經(jīng)勢在必行,采用鉆爆法開挖各種公路隧道、鐵路隧道、輕軌隧道也應(yīng)用而生,同時爆破開挖過程中產(chǎn)生的爆破地震效應(yīng)也越來越受到人們的關(guān)注。本文以寧波市軌道交通1號線二期育王嶺隧道工程為依托,通過現(xiàn)場監(jiān)測結(jié)果分析以及運用ANSYS/LS-DYNA動力分析軟件進(jìn)行數(shù)值模擬分析,展開了對隧道爆破引起的鐵路路基、邊坡等構(gòu)筑物地震效應(yīng)及其控制研究,得出了如下結(jié)論:(1)開展了依托工程爆破振動觀測測試與分析,得到了寧波地區(qū)輕軌隧道爆破地震波傳播和衰減規(guī)律。通過觀測結(jié)果回歸分析,得到了較近距離地表、較遠(yuǎn)距離鐵路路基垂直方向、水平徑向、水平切向的質(zhì)點振動速度峰值隨炸藥藥量與距離衰減的經(jīng)驗公式。(2)通過爆破地震波時頻特性分析、遠(yuǎn)近距離對比分析指出,較遠(yuǎn)距離爆破振動衰減指數(shù)比較近距離的明顯要大,衰減指數(shù)會隨著距離的增加而增大;較近距離地表的質(zhì)點振動主振頻率主要集中在20~30Hz,而較遠(yuǎn)距離鐵路路基的質(zhì)點振動主振頻率主要集中在10~20Hz。(3)建立了輕軌隧道爆破開挖數(shù)值模擬模型,進(jìn)行了隧道爆破開挖影響下鐵路路基與邊坡等構(gòu)筑物動力響應(yīng)分析。結(jié)果表明,鐵路路基與隧道爆破開挖位置平齊時,質(zhì)點振動速度衰減緩慢、峰值出現(xiàn)相對較晚,水平切向分量與振動速度矢量和吻合較好;沿鐵路路基中部斷面兩側(cè)的質(zhì)點振動速度先隨距離有一定量衰減,但隨后的衰減規(guī)律并不明顯。(4)邊坡動力響應(yīng)分析結(jié)果表明,邊坡上質(zhì)點振動速度衰減較快,且質(zhì)點振動速度峰值出現(xiàn)較早,水平切向分量與振動速度矢量和吻合較好;不同高度上的坡體特征點質(zhì)點振動速度峰值隨高度的變化并不明顯,但在坡肩上有一個明顯的放大效應(yīng)。(5)基于爆破振動安全監(jiān)測及其分析、輕軌隧道爆破開挖影響下的鐵路路基與邊坡動力響應(yīng)分析,針對依托工程的工程地質(zhì)、環(huán)境條件以及施工方法與施工工藝等,研究提出了改變開挖方法、合理控制爆破開挖進(jìn)尺、選擇合理的裝藥結(jié)構(gòu)、確定最佳炸藥單耗、合理控制掏槽孔藥量等爆破地震效應(yīng)控制方法。
[Abstract]:With the rapid development of the traffic infrastructure in China, it is imperative to build the highways in the mountainous and hilly areas, the high speed railway, and the construction of light rail in the city. The drilling and blasting method is used to excavate a variety of highway tunnels, railway tunnels and light rail tunnels are also applied, and the blasting seismic effects produced in the process of blasting excavation are also getting more and more popular. In this paper, based on the two period Yu Wang Ling tunnel project of Ningbo Rail Transit Line 1, the seismic effect and control of the railway subgrade, slope and other structures caused by tunnel blasting are studied through the analysis of the field monitoring results and the numerical simulation analysis using the ANSYS/LS-DYNA dynamic analysis software. Conclusions: (1) the propagation and attenuation laws of blasting seismic waves in Ningbo light rail tunnel are obtained by the observation and analysis of blasting vibration observation and analysis. Through the regression analysis of the observation results, the vertical direction of the railway subgrade, the horizontal diameter direction and the peak value of the horizontal tangential velocity with the explosive charge are obtained by the regression analysis of the observation results. The empirical formula of distance attenuation. (2) through the analysis of the time-frequency characteristics of blasting seismic waves, the far and near distance comparison analysis indicates that the vibration attenuation index of far distance blasting is obviously larger than that of the distance, and the attenuation index will increase with the increase of distance; the main vibration frequency of the mass point vibration of the nearer ground surface is mainly concentrated in 20~30Hz and far distance. The main vibration frequency of the particle vibration from the railway subgrade is mainly concentrated in 10~20Hz. (3) to establish the numerical simulation model of the light rail tunnel blasting excavation, and the dynamic response analysis of the railway subgrade and slope under the influence of tunnel blasting excavation is carried out. The results show that the vibration velocity of the mass point is slowly attenuated when the railway subgrade and the tunnel blasting excavation position is flat. Slow, the peak value appears relatively late, the horizontal tangential component and the vibration velocity vector and coincide well, the vibration velocity along the side of the middle section of the railway subgrade is attenuated with a certain amount of distance, but the subsequent attenuation law is not obvious. (4) the result of the slope dynamic response analysis shows that the velocity of the particle vibration attenuation on the slope is faster, and the particle vibration is vibrate. The peak value of the dynamic velocity appears earlier, the horizontal tangential component and the vibration velocity vector are in good agreement. The variation of the peak vibration velocity of the characteristic point of the slope body at different heights is not obvious with the height, but there is a significant amplification effect on the slope shoulder. (5) based on the safety monitoring and analysis of blasting vibration, the influence of the blasting excavation of the light rail tunnel is influenced by the blasting excavation. The dynamic response of railway subgrade and slope is analyzed. In view of the engineering geology, environmental conditions, construction methods and construction technology, it is proposed to change the excavation method, rationally control the blasting excavation step, select the reasonable charge structure, determine the best explosive unit consumption, and control the charge of the hole, and so on. Law.

【學(xué)位授予單位】：湖南科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U213.1;U456.3;TU311.3

【參考文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 黃華;下穿隧道爆破施工引起既有山區(qū)高速公路路基的動力響應(yīng)及控制研究[D];重慶大學(xué);2014年

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本文編號：1803767