本文關(guān)鍵詞： 淺埋隧道 爆破振動(dòng) 衰減規(guī)律 壩體 安全評(píng)價(jià)　出處：《西南交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：淺埋隧道鉆眼爆破施工過程中,由于地表建構(gòu)筑物與爆源距離較近,爆破施工對(duì)地表建構(gòu)筑物的影響復(fù)雜。隧道開挖爆破是一個(gè)重復(fù)而長(zhǎng)期的過程,頻繁爆破施工將引起地基沉降、結(jié)構(gòu)損傷甚至造成建構(gòu)筑物垮塌,直接威脅到隧道周圍群眾的生命財(cái)產(chǎn)安全。故對(duì)淺埋隧道開挖爆破引起的地震波傳播規(guī)律及爆破荷載作用下壩體動(dòng)力響應(yīng)展開分析,對(duì)爆破荷載作用下壩體安全進(jìn)行評(píng)價(jià)。以豆子灣隧道近接下穿橋橋?yàn)乘畮靺^(qū)段為工程背景,對(duì)隧道開挖爆破現(xiàn)場(chǎng)試驗(yàn)的地表和壩體振動(dòng)監(jiān)測(cè)結(jié)果展開分析,得到以下結(jié)論:隧道開挖爆破的振動(dòng)波形中主振相清晰,掏槽孔裝藥并不是最大單段裝藥量,但掏槽孔爆破的峰值振速是其它炮孔的峰值振速的2倍以上。淺埋隧道開挖爆破引起的峰值振動(dòng)在垂直于隧道軸線方向上衰減規(guī)律符合薩道夫斯基經(jīng)驗(yàn)公式,三個(gè)垂直方向的場(chǎng)地系數(shù)分別為:140.5,88.3,109.5;衰減指數(shù)分別為:1.7475,1.6254,1.6706。爆破地震波經(jīng)過地表強(qiáng)風(fēng)化巖石、庫區(qū)底部淤泥和水庫蓄水對(duì)振動(dòng)頻率的過濾作用后,爆破地震波傳播到水庫壩體位置時(shí)振動(dòng)頻率逐漸趨于平穩(wěn),主要集中在18Hz～35Hz的低頻段。運(yùn)用LS-DYNA軟件對(duì)豆子灣隧道開挖爆破施工進(jìn)行模擬分析,得到:由于爆破地震波到測(cè)點(diǎn)的入射角度不同,在X軸方向上隨著傳播距離的增加峰值振速增加后逐漸減小,其中最大峰值振速出現(xiàn)在與爆源水平距離為15m位置處。在隧道單循環(huán)進(jìn)尺為1.5m開挖爆破施工時(shí),水庫壩體三個(gè)垂直方向的峰值振速最大值分別為:0.53cm/s,0.31cm/s,0.54cm/s;壩體內(nèi)峰值振速最大值都出現(xiàn)在壩體頂部位置,壩體內(nèi)各點(diǎn)的峰值振速都小于水庫壩體允許安全峰值振速。
[Abstract]:In the construction process of shallow tunnel drilling blasting, the influence of blasting construction on surface construction is complicated because of the close distance between the surface building structure and the blasting source. The tunnel excavation blasting is a repeated and long-term process. Frequent blasting construction will cause foundation settlement, structural damage and even collapse of building structure. It is a direct threat to the safety of the lives and property of the people around the tunnel, so the propagation law of seismic wave caused by excavation blasting of shallow buried tunnel and the dynamic response of dam body under blasting load are analyzed. The safety of dam body under blasting load was evaluated. Based on the engineering background of Douzi Bay tunnel, the vibration monitoring results of ground surface and dam body of blasting site test were analyzed. The following conclusions are obtained: the main vibration phase in the vibration waveform of tunnel excavation blasting is clear, and the charge for the slot hole is not the maximum single stage charge. But the peak vibration velocity of the cut hole blasting is more than 2 times that of the other holes. The attenuation law of the peak vibration caused by the shallow tunnel excavation blasting in the direction perpendicular to the tunnel axis conforms to the Sadolski's empirical formula. The site coefficients of the three vertical directions are respectively: 1 140.5 / 88. 3 / 109.5; The attenuation exponents are: 1: 1.7475 / 1.6254N / 1.6706.After the blasting seismic waves are filtered by the strongly weathered rocks at the surface, the silt at the bottom of the reservoir area and the reservoir water storage, the vibration frequency is filtered. When the blasting seismic wave propagates to the reservoir dam body the vibration frequency tends to be steady gradually. It is mainly concentrated in the low frequency band of 18Hz ~ 35Hz. The blasting construction of Douzi Bay tunnel is simulated and analyzed by using LS-DYNA software. It is concluded that the incident angle from blasting seismic wave to measuring point is different. In the direction of X axis, the peak vibration velocity decreases gradually with the increase of propagation distance. The maximum peak vibration velocity occurs at the position of 15m horizontal distance from the explosion source, and when the tunnel single cycle advance is 1.5 m excavation blasting. The maximum value of peak vibration velocity in three vertical directions of reservoir dam is: 0.53 cm / s 0.31 cm / s 0.54 cm / s; The maximum value of peak vibration velocity in the dam body appears at the top of the dam body, and the peak vibration velocity of each point in the dam body is less than the allowable peak vibration velocity of the dam body of the reservoir.
【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;TV698.1

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