本文選題：淺埋隧道 + 爆破振動(dòng)　； 參考：《西南交通大學(xué)》2017年碩士論文

【摘要】：采用鉆爆法進(jìn)行隧道掘進(jìn)施工的過程中,爆破施工產(chǎn)生的振動(dòng)被認(rèn)為是影響最大的負(fù)面效應(yīng)。在淺埋隧道工程的爆破施工中,由于隧道的埋深較淺,導(dǎo)致地表的振動(dòng)效應(yīng)比較明顯。如果不了解爆破地震波在地表的傳播規(guī)律,就有可能導(dǎo)致地表的建筑物因過大的振動(dòng)強(qiáng)度而發(fā)生破壞,造成嚴(yán)重的工程事故�？斩葱�(yīng)導(dǎo)致淺埋隧道爆破開挖時(shí)地表的振動(dòng)發(fā)生區(qū)域性變化的特征,即隧道掌子面后方開挖成洞區(qū)拱頂上方地表的振動(dòng)速度大于對(duì)稱位置未開挖區(qū)的地表振動(dòng)速度的現(xiàn)象。本文主要以成貴高鐵豆子灣隧道下穿橋橋?yàn)乘畮鞛楣こ瘫尘?通過對(duì)隧道上方地表進(jìn)行振動(dòng)測(cè)試試驗(yàn)和數(shù)值模擬計(jì)算相結(jié)合的方法,進(jìn)行爆破荷載作用下淺埋隧道地表振動(dòng)的空洞效應(yīng)研究。對(duì)現(xiàn)場試驗(yàn)測(cè)得的地表振動(dòng)速度波形圖進(jìn)行分析,得到掏槽孔起爆引起的地表振動(dòng)速度最大,掏槽孔起爆引起的振動(dòng)對(duì)地表振動(dòng)強(qiáng)度起決定性作用。提出空洞效應(yīng)振速放大系數(shù)作為衡量空洞效應(yīng)導(dǎo)致的地表振動(dòng)放大效應(yīng)的標(biāo)準(zhǔn)。進(jìn)行數(shù)值模擬研究,提出爆破荷載的施加方法和邊界條件的處理措施,得到進(jìn)行爆破荷載作用下淺埋隧道地表振動(dòng)研究的數(shù)值模擬方法,對(duì)計(jì)算結(jié)果進(jìn)行分析得到空洞效應(yīng)在隧道掘進(jìn)方向上的變化規(guī)律和隧道上方地表受空洞效應(yīng)影響的區(qū)域范圍。提出分段楔形掏槽的掏槽孔起爆方法來削弱空洞效應(yīng)導(dǎo)致的地表振動(dòng)的放大效應(yīng),并在廣州地鐵二十一號(hào)線區(qū)間隧道上進(jìn)行應(yīng)用實(shí)踐。
[Abstract]:In the process of tunneling construction by drilling and blasting, the vibration produced by blasting construction is considered to be the most negative effect. In the blasting construction of shallow tunnel engineering, the vibration effect of the ground surface is obvious because of the shallow buried depth of the tunnel. If we do not understand the propagation law of blasting seismic wave on the surface of the earth, it is possible to cause the destruction of buildings on the surface due to excessive vibration intensity and cause serious engineering accidents. The cavitation effect leads to the regional variation of the surface vibration during the blasting excavation of shallow buried tunnel, that is, the vibration velocity of the surface above the arch roof is higher than that of the unexcavated area in the symmetrical position after the excavation of the tunnel surface behind the face of the tunnel. In this paper, based on the engineering background of Qiaqiao Bay Reservoir under the Douzi Bay Tunnel of Chenggui High-speed Railway, the vibration test and numerical simulation of the surface above the tunnel are carried out. The cavity effect of shallow tunnel surface vibration under blasting load is studied. By analyzing the waveform of surface vibration velocity measured by field test, it is found that the surface vibration velocity caused by cutting hole initiation is the largest, and the vibration caused by the opening hole detonation plays a decisive role in the surface vibration intensity. The magnification factor of cavity effect is put forward as the criterion to measure the effect of surface vibration amplification caused by cavity effect. In this paper, numerical simulation is carried out, and the method of applying blasting load and the treatment of boundary condition are put forward, and the numerical simulation method of surface vibration of shallow buried tunnel under blasting load is obtained. Based on the analysis of the calculated results, the variation of cavitation effect in the tunneling direction and the range of the area affected by the cavitation effect on the surface above the tunnel are obtained. In this paper, a new method is proposed to reduce the amplification effect of surface vibration caused by cavity effect, and the method is applied to the tunnel of Guangzhou Metro Line 21.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U455.6

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