【摘要】：鉆爆法是隧道掘進(jìn)的一種主要施工方法,在爆破振動(dòng)作用下,圍巖及支護(hù)結(jié)構(gòu)的穩(wěn)定性將受到影響。隧道圍巖穩(wěn)定性是施工中最重要的安全問(wèn)題,所以,隧道爆破掘進(jìn)時(shí),必須弄清楚隧道圍巖和支護(hù)結(jié)構(gòu)對(duì)爆破振動(dòng)的動(dòng)力響應(yīng),從而將爆破產(chǎn)生的影響控制在允許范圍之內(nèi)。本文針對(duì)陡傾層狀巖體的特點(diǎn),以杭瑞高速公路貴州境內(nèi)青山隧道為研究背景,通過(guò)現(xiàn)場(chǎng)監(jiān)測(cè),在研究爆破振動(dòng)衰減規(guī)律的基礎(chǔ)上,采用數(shù)值模擬方法,系統(tǒng)的研究了爆破振動(dòng)作用下,圍巖和支護(hù)結(jié)構(gòu)的振速、應(yīng)力和位移的動(dòng)態(tài)響應(yīng)規(guī)律。取得的主要研究成果如下:1.現(xiàn)場(chǎng)監(jiān)測(cè),得到青山隧道不同爆源距拱腳處的爆破振動(dòng)速度,采用M.A薩道夫斯基公式回歸分析建立爆破振動(dòng)沿隧道拱腳處的傳播衰減規(guī)律公式,通過(guò)公式預(yù)測(cè)安全振速下單段最大裝藥量,并通過(guò)對(duì)其他兩個(gè)不同地質(zhì)條件和爆破方案的隧道進(jìn)行爆破振動(dòng)監(jiān)測(cè),從而提出合理的振動(dòng)控制措施。2.采用ADINA有限元軟件,建立與現(xiàn)場(chǎng)監(jiān)測(cè)相同段的隧道三維數(shù)值模型,考慮巖層結(jié)構(gòu)面的影響,研究爆炸地震波在青山隧道III類(lèi)圍巖中的傳播衰減規(guī)律,同時(shí)分析了爆破過(guò)程中圍巖和支護(hù)結(jié)構(gòu)應(yīng)力場(chǎng)和位移場(chǎng)的變化規(guī)律。3.分析爆破振動(dòng)誘發(fā)陡傾層狀圍巖隧道失穩(wěn)機(jī)理,并針對(duì)陡傾層狀圍巖幾種常見(jiàn)的失穩(wěn)形式進(jìn)行分析,對(duì)圍巖失穩(wěn)的臨界振速進(jìn)行預(yù)測(cè)。
[Abstract]:Drilling and blasting method is one of the main construction methods for tunneling. Under the action of blasting vibration, the stability of surrounding rock and supporting structure will be affected. The stability of tunnel surrounding rock is the most important safety problem in construction. Therefore, the dynamic response of tunnel surrounding rock and supporting structure to blasting vibration must be made clear when tunneling by blasting, so that the influence of blasting is controlled within the allowable range. In view of the characteristics of steeply inclined layered rock mass, taking Qingshan Tunnel in Hangrui Expressway as the research background, based on the field monitoring, and on the basis of studying the attenuation law of blasting vibration, the numerical simulation method is adopted in this paper. The dynamic response law of vibration velocity, stress and displacement of surrounding rock and supporting structure under blasting vibration is studied systematically. The main research results are as follows: 1. On site monitoring, the blasting vibration velocity at different blasting source distance from arch foot in Qingshan tunnel is obtained. The propagation and attenuation law formula of blasting vibration along the arch foot of tunnel is established by means of M.A. Sadolski formula regression analysis. The maximum charge quantity of the order section of the safe vibration velocity is predicted by the formula, and the blasting vibration monitoring of the other two tunnels with different geological conditions and blasting schemes is carried out, and the reasonable vibration control measures are put forward. 2. Using ADINA finite element software, the three-dimensional numerical model of tunnel in the same section as field monitoring is established. Considering the influence of rock structure plane, the propagation and attenuation law of explosion seismic wave in III surrounding rock of Qingshan tunnel is studied. At the same time, the variation law of stress field and displacement field of surrounding rock and supporting structure during blasting are analyzed. The mechanism of tunnel instability induced by blasting vibration is analyzed and the critical vibration velocity of rock mass instability is predicted according to several common instability forms of steep inclined layered surrounding rock.
【學(xué)位授予單位】：貴州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U451

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本文編號(hào)：2271606