【摘要】：隨著爆破技術(shù)在工程中的廣泛應(yīng)用，微差爆破作為一種有效的爆破減振技術(shù)，得到人們的很大關(guān)注。同時,數(shù)碼雷管的規(guī)模化生產(chǎn)，也為精確微差爆破的實現(xiàn)提供了物質(zhì)基礎(chǔ),因此，研究臨近邊坡爆破最優(yōu)微差時間，對保護(hù)邊坡穩(wěn)定、維持基建工程安全運(yùn)行有十分重要的意義。 本文針對不同方法選取的最優(yōu)微差時間差距較大的問題，以國家自然科學(xué)基金項目（51174147）為背景，基于室內(nèi)混凝土邊坡實驗，首先利用小波包分析技術(shù)對不同微差時間下的爆破振動信號進(jìn)行小波包能量譜研究，獲得了振動信號在不同頻帶上的能量分布圖，得出該實驗背景下的最優(yōu)微差時間。然后，對爆破振動速度信號進(jìn)行微分、去噪處理，采用Fourier變換方法求得信號的加速度和標(biāo)準(zhǔn)加速度反應(yīng)譜；通過對比響應(yīng)加速度大小，從另一角度確定了該邊坡模型的最優(yōu)微差時間，而且二種方法所得結(jié)果基本一致。說明運(yùn)用爆破振動信號小波包分析和反應(yīng)譜分析綜合分析方法確定最優(yōu)微差時間是可行并符合實際的。 本文為最優(yōu)微差時間的確定提供了一種新的分析方法；此外，論文還結(jié)合邊坡模態(tài)分析，得出邊坡上可能的共振區(qū)域，對臨近邊坡爆破工程具有一定的指導(dǎo)意義。
[Abstract]:With the wide application of blasting technology in engineering, millisecond blasting, as an effective blasting vibration reduction technology, has received great attention. At the same time, the large-scale production of digital detonators also provides a material basis for the realization of precise millisecond blasting. Therefore, the study of the optimal millisecond time of near slope blasting is beneficial to the protection of slope stability. It is of great significance to maintain the safe operation of capital construction projects. In this paper, aiming at the problem that the difference of optimal differential time between different methods is large, taking the project of National Natural Science Foundation (51174147) as the background, based on the indoor concrete slope experiment, Firstly, wavelet packet analysis technique is used to study the wavelet packet energy spectrum of the blasting vibration signal under different millisecond difference time. The energy distribution diagram of the vibration signal in different frequency bands is obtained, and the optimal differential time under the experimental background is obtained. Then, the velocity signal of blasting vibration is treated by differential and de-noising, and the acceleration and standard acceleration response spectrum of the signal are obtained by Fourier transform, and the magnitude of response acceleration is compared. From another point of view, the optimal differential time of the slope model is determined, and the results obtained by the two methods are basically consistent. It is shown that it is feasible and practical to determine the optimal differential time by using the wavelet packet analysis of blasting vibration signal and the comprehensive analysis method of response spectrum analysis. This paper provides a new analysis method for the determination of optimal differential time, in addition, combining with the slope modal analysis, the possible resonance region on the slope is obtained, which has certain guiding significance for the blasting engineering near the slope.
【學(xué)位授予單位】：武漢科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU751.9;TB41

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