本文選題：震動載荷 + 動力響應(yīng)��； 參考：《內(nèi)蒙古科技大學(xué)》2015年碩士論文

【摘要】：隨著我國工業(yè)的改革，，能源產(chǎn)業(yè)低消耗、高利用的戰(zhàn)略思想深入到每個資源領(lǐng)域，特別是采礦行業(yè)。全面協(xié)調(diào)可持續(xù)的發(fā)展理念要求采礦行業(yè)克服種種困難，對一切可用可不用的礦業(yè)資源必須實行科學(xué)高效的利用。同時對自然環(huán)境的保護和人身安全的注重，更加重了采礦技術(shù)者的“負擔”，凸顯了安全開采的重要性。 以露天礦開采為例，由于經(jīng)濟利益的驅(qū)使，露天開采邊坡逐漸趨于高陡化。在最小的范圍內(nèi)獲取最大的礦業(yè)資源，迫使采礦技術(shù)不斷革新，開采難度不斷加大，而邊坡的不穩(wěn)定系數(shù)也一并得到了提高。加上現(xiàn)代爆破開采技術(shù)的應(yīng)用以及自然地震等動載荷的作用，更加大了高陡化邊坡的失穩(wěn)系數(shù)，研究動載下邊坡的響應(yīng)規(guī)律日趨重要。傳統(tǒng)的邊坡穩(wěn)定性分析方法僅選取兩個靜止狀態(tài)進行分析，沒有真正實現(xiàn)對動力加載過程的研究，雖對實際生產(chǎn)有一定借鑒意義，但始終存在紕漏�；谌S顯式有限差分計算的FLAC3D數(shù)值分析軟件，為分析動載荷作用提供了一種全新手段。 論文首先對動載荷作用進行分析，了解動力載荷的產(chǎn)生過程和作用機理。發(fā)現(xiàn)動載荷的實質(zhì)是地震、人工爆破等震動引起的震動波作用在邊坡上，引起邊坡內(nèi)外質(zhì)點的振動的現(xiàn)象。研究了不同震動波的傳播特征和動力作用特征的同時，結(jié)合FLAC3D的動力分析功能，給出了數(shù)值模擬的原理和求解方法。 其次，以雙利露天礦邊坡為對象建立數(shù)值模型，按照震動波頻率與計算要求劃分模型網(wǎng)格。并從動載荷的選取與輸入方法、邊界的設(shè)定、內(nèi)部阻尼的選取等方面討論了影響數(shù)值模擬的因素，選取了較為合理的參數(shù)，分工況對實測震動波信號進行了FLAC3D數(shù)值模擬，獲取了最佳模擬效果。 最后通過實時監(jiān)測、記錄坡體不同部位震動響應(yīng)值，對動載條件下邊坡的動載響應(yīng)規(guī)律進行總結(jié)。發(fā)現(xiàn)動載作用下邊坡的應(yīng)力應(yīng)變受動力作用的強弱、巖體力學(xué)參數(shù)大小影響顯著；不同持時、幅值、頻率下，邊坡的動力響應(yīng)加速度、速度及位移等表現(xiàn)出不同程度的變化，呈現(xiàn)一定的規(guī)律。為了進一步驗證這些規(guī)律的正確性，結(jié)合實際工程應(yīng)用，對比不同分析方法下的邊坡穩(wěn)定系數(shù)，證明了利用FLAC3D數(shù)值模擬分析動力問題的可靠性，同時也為預(yù)裂爆破的優(yōu)化提供了理論依據(jù)。
[Abstract]:With the reform of industry in China, the low consumption of energy industry and the strategic thought of high utilization have penetrated into every field of resources, especially in mining industry.The idea of comprehensive and sustainable development requires the mining industry to overcome all kinds of difficulties and to make scientific and efficient use of all available mining resources.At the same time, the emphasis on the protection of natural environment and personal safety has increased the burden of mining technologists and highlighted the importance of safe mining.Taking open pit mining as an example, the slope of opencast mining tends to be steep because of economic benefits.To obtain the largest mining resources in the minimum range, the mining technology is constantly innovated, the mining difficulty is increasing, and the instability coefficient of the slope is also increased.Combined with the application of modern blasting mining technology and the action of natural earthquake and other dynamic loads, the instability coefficient of high steepening slope is increased, and it is increasingly important to study the response law of slope under dynamic load.The traditional slope stability analysis method only selects two static states to analyze, and does not really realize the study of dynamic loading process. Although it has some reference significance for practical production, there are always flaws.FLAC3D numerical analysis software based on 3D explicit finite difference calculation provides a new method for dynamic load analysis.In this paper, the process and mechanism of dynamic load are analyzed.It is found that the essence of the dynamic load is the phenomenon that the vibration waves caused by earthquake and artificial blasting are acting on the slope and causing the vibration of the particles inside and outside the slope.The propagation and dynamic characteristics of different vibration waves are studied, and the principle and solution of numerical simulation are given in combination with the dynamic analysis function of FLAC3D.Secondly, the numerical model of the slope of Shuangli opencast mine is established, and the model grid is divided according to the frequency of vibration wave and the requirement of calculation.The factors influencing the numerical simulation are discussed from the aspects of the selection and input method of dynamic load, the setting of boundary and the selection of internal damping, and the reasonable parameters are selected. The FLAC3D numerical simulation of the measured vibration wave signal is carried out under different working conditions.The best simulation effect is obtained.Finally, the dynamic response of slope under dynamic load is summarized by recording the vibration response of different parts of slope through real-time monitoring.It is found that the stress and strain of the slope under dynamic load are affected by the dynamic action and the mechanical parameters of the rock mass are significantly affected, and the dynamic response acceleration, velocity and displacement of the slope show varying degrees under different durations, amplitudes and frequencies.Show a certain regularity.In order to further verify the correctness of these laws, combined with practical engineering applications, the slope stability coefficients under different analysis methods are compared, and the reliability of dynamic problem analysis using FLAC3D numerical simulation is proved.It also provides a theoretical basis for the optimization of pre-splitting blasting.
【學(xué)位授予單位】：內(nèi)蒙古科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD804

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本文編號：1764794