本文選題：膏體充填 + 管道輸送�。� 參考：《北京科技大學(xué)》2018年博士論文

【摘要】：膏體充填技術(shù)是國(guó)家“綠色礦山,深部采礦”發(fā)展戰(zhàn)略的重要支撐,管道輸送是優(yōu)質(zhì)膏體順利進(jìn)入采場(chǎng)實(shí)現(xiàn)預(yù)定功能的必要條件。通過流變學(xué)理論對(duì)結(jié)構(gòu)流膏體的管道阻力特性進(jìn)行分析是行之有效的方法。但膏體流變學(xué)特征與材料特性之間的關(guān)系以及在時(shí)間和溫效應(yīng)下的流變特征變化規(guī)律仍不清晰,同時(shí)在時(shí)-溫效應(yīng)下的膏體管道輸送阻力也有待研究。從膏體材料的基本結(jié)構(gòu)和性能出發(fā),開展了流變參數(shù)影響因素實(shí)驗(yàn)與理論研究,建立了考慮時(shí)-溫效應(yīng)的膏體流變參數(shù)預(yù)測(cè)模型和時(shí)-溫效應(yīng)下的膏體管道輸送阻力預(yù)測(cè)模型,并最終將理論成果成功應(yīng)用于礦山充填實(shí)踐。主要研究?jī)?nèi)容包括以下幾點(diǎn):(1)探明了流變參數(shù)隨料漿濃度、膏體穩(wěn)定系數(shù)和骨料比重的變化規(guī)律。構(gòu)建了表征漿體級(jí)配結(jié)構(gòu)的膏體穩(wěn)定系數(shù),從宏觀、細(xì)觀、微觀三種尺度揭示了流變時(shí)-溫演化機(jī)理。得出流變參數(shù)主要受料漿級(jí)配結(jié)構(gòu)和絮網(wǎng)結(jié)構(gòu)支配,觸變過程是絮網(wǎng)秩序化的反映,溫度升高促使絮網(wǎng)結(jié)構(gòu)向液網(wǎng)結(jié)構(gòu)轉(zhuǎn)化,在流體曳力作用下絮網(wǎng)運(yùn)移秩序化,屈服應(yīng)力和塑性黏度降低。(2)建立了屈服應(yīng)力和塑性黏度時(shí)-溫效應(yīng)計(jì)算模型。根據(jù)膏體料漿應(yīng)力松弛特性建立了考慮剪切速率和時(shí)間因素的觸變特征定量描述方法。首次對(duì)膏體觸變性和溫度效應(yīng)進(jìn)行了耦合分析,得出了屈服應(yīng)力和塑性黏度隨剪切時(shí)間和溫度的變化規(guī)律。根據(jù)時(shí)-溫等效原理建立了屈服應(yīng)力和塑性黏度時(shí)-溫效應(yīng)預(yù)測(cè)模型。(3)綜合考慮物料特性、輸送條件和外部條件對(duì)膏體管道沿程阻力的影響,構(gòu)建了時(shí)-溫效應(yīng)下膏體沿程阻力預(yù)測(cè)模型。得到了六種管道布置形式下的阻力變化特征。建立了時(shí)-溫效應(yīng)充填倍線計(jì)算方法,并量化了易發(fā)堵管、爆管事故的關(guān)鍵管段。(4)構(gòu)建了時(shí)-溫效應(yīng)膏體管道輸送數(shù)值模型,成功再現(xiàn)了時(shí)-溫效應(yīng)下膏體三維結(jié)構(gòu)流態(tài)時(shí)空演化過程。通過離散具有時(shí)間和溫度因子的Navier-Stokes(N-S)方程,計(jì)算得出了隨時(shí)間和溫度變化的膏體管道輸送速度、壓力分布規(guī)律。驗(yàn)證了數(shù)學(xué)模型的有效性。
[Abstract]:Paste filling technology is an important support for the development strategy of "green mine, deep mining" in China. Pipeline transportation is the necessary condition for the smooth entry of high quality paste into the stope to realize the predetermined function. It is an effective method to analyze the resistance characteristics of structural plaster by rheological theory. However, the relationship between rheological characteristics of paste and material properties and the variation of rheological characteristics under time and temperature effects are still unclear, and the resistance of plaster pipeline transportation under time-temperature effect is also to be studied. Based on the basic structure and properties of the paste material, the experimental and theoretical study on the influencing factors of rheological parameters was carried out, and the prediction model of rheological parameters of the paste considering the time-temperature effect and the resistance prediction model of the plaster pipeline transportation under the time-temperature effect were established. Finally, the theoretical results are successfully applied to the practice of mine filling. The main contents of this study are as follows: (1) the variation of rheological parameters with slurry concentration, paste stability coefficient and aggregate specific gravity is studied. The stability coefficient of paste was constructed to characterize the structure of slurry gradation, and the mechanism of rheological time-temperature evolution was revealed from macroscopic, meso and microscopic scales. The rheological parameters are mainly controlled by slurry gradation structure and floc net structure, and the thixotropic process is the reflection of the order of the floc net, and the increase of temperature promotes the transformation from the floc structure to the liquid net structure, and the floc movement is orderly under the action of the fluid drag force. The yield stress and plastic viscosity are reduced. 2) the time-temperature effect model of yield stress and plastic viscosity is established. According to the stress relaxation characteristics of paste slurry, a quantitative description method of thixotropic characteristics considering shear rate and time was established. The thixotropy and temperature effect of paste were analyzed for the first time, and the variation of yield stress and plastic viscosity with shear time and temperature was obtained. According to the principle of time-temperature equivalence, a prediction model of yield stress and plastic viscosity time-temperature effect is established. The prediction model of the resistance along the paste under the effect of time and temperature was established. The variation characteristics of resistance under six types of pipeline arrangement are obtained. The calculation method of time-temperature effect filling doubling line is established, and the numerical model of pipeline transportation of time-temperature effect paste body is established by quantifying the key section of pipe that is easy to be plugged and the key section of pipe burst accident. The spatiotemporal evolution of the three-dimensional structure of the paste under the time-temperature effect has been successfully reproduced. By discretization of Navier-Stokes N-S equation with time and temperature factors, the distribution of velocity and pressure of plaster pipeline with time and temperature is calculated. The validity of the mathematical model is verified.
【學(xué)位授予單位】：北京科技大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2018
【分類號(hào)】：TD853.34

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