本文選題：爆炸沖擊 + 損傷�。� 參考：《西南科技大學(xué)》2015年碩士論文

【摘要】：隨著社會經(jīng)濟發(fā)展的需要和工業(yè)原材料的需求,礦產(chǎn)資源已經(jīng)成為不可或缺的物質(zhì)基礎(chǔ),并且伴隨著需求量的日益增加,礦產(chǎn)資源的需求量也隨之大幅增漲。采礦業(yè)為國民經(jīng)濟做出了巨大貢獻,但目前礦山工程爆破方面仍面臨著較大的壓力和挑戰(zhàn),礦山爆破生產(chǎn)中亟需提高爆破質(zhì)量和爆破效果,因此通過理論和試驗研究爆破效果的改善和優(yōu)化具有重大的意義。本文首先通過對不同抵抗線的巖石試件進行不堵塞爆炸試驗,利用聲波測試及CT成像技術(shù),研究了巖石在爆炸沖擊荷載作用下的損傷規(guī)律。試驗結(jié)果表明,巖石徑向爆炸沖擊損傷以炮孔為中心向四周衰減,衰減率隨巖石到爆點中心的距離增加呈非線性降低,距炮孔中心位置3倍孔徑內(nèi)巖石損傷降低迅速,3倍孔徑外損傷降低緩慢;炮孔軸向損傷隨巖石距裝藥中心位置距離增加呈降低的趨勢,剛開始降低梯度較大,后隨著距離增大梯度趨于平緩;不同抵抗線距離起爆的巖石試件炮孔軸向和徑向受到的爆炸沖擊損傷存在著差異。其次通過不同損傷度巖石試件的單軸抗壓試驗,研究了損傷巖石的力學(xué)性能,得出巖石峰值應(yīng)力隨損傷度的增加而降低,且降低率隨損傷度增加逐漸增大;對損傷巖石峰值前應(yīng)力應(yīng)變曲線采用多項式進行擬合,并在此基礎(chǔ)上得出了巖石損傷本構(gòu)關(guān)系表達式。最后進行了巖石在不同損傷狀況下的爆破試驗,研究了巖石爆炸沖擊損傷對爆破效果的影響規(guī)律。試驗得出,不同抵抗線距離起爆的巖石試件受到的爆炸沖擊損傷不同,抵抗線小的巖石試件受到的爆炸沖擊損傷較大,爆破效果更好。本研究得出了巖石在爆炸沖擊作用下的損傷規(guī)律,得出了爆炸沖擊作用下巖石損傷本構(gòu)關(guān)系,得到了巖石爆炸沖擊損傷對爆破效果的影響規(guī)律,為優(yōu)化礦山爆破參數(shù)、改善爆破效果和提高爆破質(zhì)量提供了參考。
[Abstract]:With the development of social economy and the demand of industrial raw materials, mineral resources have become an indispensable material basis, and with the increasing demand, the demand for mineral resources has also increased substantially. The mining industry has made great contributions to the national economy, but at present, the mine engineering blasting is still faced with great pressure and challenge. It is urgent to improve the blasting quality and blasting effect in the mine blasting production. Therefore, it is of great significance to study the improvement and optimization of blasting effect through theory and experiment. In this paper, the damage law of rock subjected to blast shock loading is studied by means of acoustic wave test and CT imaging technique by means of non-clogging explosion test of rock specimens with different resistance lines. The experimental results show that the radial blast impact damage of rock attenuates around the center of the hole, and the attenuation rate decreases with the increase of the distance between the rock and the center of the blasting point. The damage of rock decreases rapidly by 3 times pore diameter from the center of the hole and decreases slowly with the increase of the distance from the center of the hole to the center of the charge, and the gradient is larger at the beginning of the decrease of the axial damage of the hole with the increase of the distance from the center of the rock to the charge center. The gradient tends to be gentle with the increase of distance, and there are differences in the axial and radial impact damage of the blasting holes of rock specimens with different resistance line distances. Secondly, through uniaxial compression test of rock specimens with different damage degree, the mechanical properties of damaged rock are studied. It is concluded that the peak stress of rock decreases with the increase of damage degree, and the decreasing rate increases gradually with the increase of damage degree. The stress-strain curve before peak value of damaged rock is fitted by polynomial, and the constitutive expression of rock damage is obtained. Finally, the blasting test of rock under different damage conditions was carried out, and the effect of rock blast impact damage on blasting effect was studied. The experimental results show that rock specimens with different distance of resistance line are affected by different blast impact damage, and rock specimens with small resistance line are damaged more by explosion impact, and the blasting effect is better than that of rock specimen with small resistance line. In this study, the damage law of rock under explosion shock is obtained, the constitutive relation of rock damage under explosion shock is obtained, and the influence law of rock explosion impact damage on blasting effect is obtained, so as to optimize the blasting parameters of mine. A reference is provided to improve the blasting effect and the blasting quality.
【學(xué)位授予單位】：西南科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD235

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相關(guān)期刊論文 前1條

1 周黎明,王法剛,肖國強,鄭明福;超聲波層析成像技術(shù)在三峽工程混凝土質(zhì)量檢測中的應(yīng)用[J];無損檢測;2004年10期

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本文編號：2020080