本文選題：淺埋大斷面隧道 + 爆炸應(yīng)力波��； 參考：《西安工業(yè)大學(xué)》2017年碩士論文

【摘要】：隨著我國(guó)公路和鐵路建造事業(yè)的快速發(fā)展,新建隧道下穿既有公路會(huì)越來(lái)越多。新建隧道爆破開(kāi)挖時(shí),由于埋深較淺,圍巖較差而嚴(yán)重威脅既有公路的安全。為保證新建隧道和既有道路安全,需結(jié)合實(shí)際的施工條件,擬定合理的爆破方案和設(shè)計(jì)參數(shù)。本文以新建某隧道下穿316國(guó)道為背景,采用理論分析、現(xiàn)場(chǎng)試驗(yàn)、數(shù)值模擬相結(jié)合的方法,系統(tǒng)地研究了淺埋大斷面隧道下穿既有公路的爆破控制技術(shù)。主要研究?jī)?nèi)容和結(jié)論如下:(1)對(duì)巖石中爆炸應(yīng)力波進(jìn)行了總結(jié)和分析,并基于應(yīng)力波理論,推導(dǎo)了彈性應(yīng)力波在完全彈性體內(nèi)的質(zhì)點(diǎn)峰值振速公式,修正了多孔爆破質(zhì)點(diǎn)峰值振速理論公式,揭示了爆炸應(yīng)力波的傳播衰減規(guī)律。(2)結(jié)合某新建某隧道出口下穿316國(guó)道段實(shí)際情況,通過(guò)相關(guān)經(jīng)驗(yàn)公式和工程經(jīng)驗(yàn)確定了爆破器材、掏槽位置、裝藥結(jié)構(gòu)、掘進(jìn)進(jìn)尺等爆破技術(shù)相關(guān)參數(shù),制定了下穿段爆破方案。(3)根據(jù)下穿段的實(shí)際地形、工程地質(zhì)情況和施工方法,采用MidasGTSNX軟件對(duì)下穿段左上和右上部分爆破掘進(jìn)開(kāi)挖建立了數(shù)值模型。結(jié)果表明:路面質(zhì)點(diǎn)峰值振速、應(yīng)力、位移均滿足相關(guān)規(guī)范的要求。(4)在新建隧道下穿既有316國(guó)道爆破施工過(guò)程中,進(jìn)行了爆破現(xiàn)場(chǎng)試驗(yàn)。并將現(xiàn)場(chǎng)試驗(yàn)、理論計(jì)算的結(jié)果進(jìn)行了對(duì)比分析,結(jié)果表明:計(jì)算值與實(shí)測(cè)值的相對(duì)誤差最小值為1.68%,平均相對(duì)誤差為12.46%,計(jì)算值與實(shí)測(cè)值誤差較少,證明本文提出的公式在一定程度上能夠反映爆破振動(dòng)對(duì)既有道路的影響,初步證明了該式是合理可行的。
[Abstract]:With the rapid development of highway and railway construction in China, there will be more and more existing roads under the new tunnel. When the new tunnel blasting is excavated, because of the shallow buried depth and poor surrounding rock, it is a serious threat to the safety of the highway. In order to ensure the safety of the new tunnel and the existing road, the actual construction conditions should be consolidated and a reasonable blasting scheme is drawn up. In this paper, based on the background of 316 national highway under a new tunnel, the blasting control technology of the existing highway under shallow buried large section tunnel is systematically studied by means of theoretical analysis, field test and numerical simulation. The main research contents and conclusions are as follows: (1) the explosion stress waves in the rock are summarized and analyzed, and the main conclusions are as follows. Based on the stress wave theory, the formula of the peak vibration velocity of the elastic stress wave in the full elastic body is derived, the theoretical formula of the peak vibration velocity of the porous blasting particle is corrected and the propagation attenuation law of the explosive stress wave is revealed. (2) the actual situation of the 316 national highway section under the outlet of a certain new tunnel is given, and the relevant empirical formula and engineering experience are confirmed. The blasting equipment, the position of cutting, the structure of charge and the parameters related to the blasting technology are set up. (3) according to the actual terrain, the engineering geology and the construction method of the lower section, the numerical model is established by using MidasGTSNX software to excavate the top left and right upper parts of the lower section. The results show that the pavement is the road surface. The peak vibration velocity, stress and displacement meet the requirements of the relevant specifications. (4) in the construction process of the 316 national highway under the new tunnel, the blasting field test is carried out. The results of the field test and the theoretical calculation are compared and analyzed. The results show that the minimum relative error of the calculated value and the measured value is 1.68%, and the average relative error is the relative error. For 12.46%, the error between the calculated value and the measured value is less. It is proved that the formula presented in this paper can reflect the effect of blasting vibration on the existing road to a certain extent, and it is proved that the formula is reasonable and feasible.
【學(xué)位授予單位】：西安工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U455.4

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