【摘要】：隨著煤炭開采深度的不斷增加,許多礦井的開采深度已經(jīng)達到上千米,巖石表現(xiàn)出了一定的流變特性。在高地應(yīng)力作用下,軟巖巷道礦壓顯現(xiàn)劇烈、變形較大,深埋高應(yīng)力軟巖巷道的支護問題愈來愈突出。因此,研究深埋軟巖巷道的變形破壞機理,對控制巷道圍巖穩(wěn)定性具有重要意義。本文結(jié)合趙莊煤業(yè)深埋煤巷變形破壞嚴(yán)重的特征,采用理論分析、現(xiàn)場監(jiān)測及數(shù)值計算等方法,基于流變理論通過反分析方法得到了符合工程實際的圍巖流變力學(xué)參數(shù),并在此基礎(chǔ)上優(yōu)化了深埋軟巖巷道的原有支護方案。取得的主要成果歸納如下:(1)以線彈性理論為基礎(chǔ),采用兩種計算模型分別計算出了巷道變形的線彈性解析解。并在此基礎(chǔ)上,基于Burgers蠕變本構(gòu)模型經(jīng)過理論推導(dǎo),得到了巷道變形的黏彈性解析解,為反分析計算做鋪墊。(2)針對基本BP神經(jīng)網(wǎng)絡(luò)算法在計算過程中誤差函數(shù)容易陷入局部極小值而難以達到全局最小值導(dǎo)致算法精度不高的問題,采用PSO算法對BP算法的不足之處進行了修正,得到精度更高的智能反分析算法。(3)將現(xiàn)場實測數(shù)據(jù)代入修正后的反分析算法中經(jīng)反分析計算得到了符合工程實際的圍巖Burgers蠕變模型力學(xué)參數(shù)值。同時通過數(shù)值計算揭示了隨著時間的增加,Burgers模型不同蠕變參數(shù)的變化對巷道變形影響的內(nèi)在機理。(4)在得到圍巖Burgers模型蠕變力學(xué)參數(shù)的基礎(chǔ)上,研究了注漿加固體不同力學(xué)參數(shù)、不同注漿時間、不同注漿加固圈厚度等因素對注漿支護效果的影響。經(jīng)分析得到,單純提高某個注漿體參數(shù)值或某幾個參數(shù)值,很難得到最合理的支護效果,需要綜合考慮各個注漿體參數(shù)對巷道變形的影響,尋求最合理的注漿支護參數(shù)。(5)采用灰色關(guān)聯(lián)分析法對注漿體不同力學(xué)參數(shù)、不同注漿時間、不同注漿加固圈厚度等因素組合下巷道支護效果進行分析,最終得到合理的全斷面二次注漿加固方案的技術(shù)參數(shù)并在此基礎(chǔ)上給出了巷道二次注漿支護的工程設(shè)計支護方案。
[Abstract]:With the increasing depth of coal mining, the mining depth of many mines has reached thousands of meters, and the rocks show some rheological characteristics. Under the action of high in-situ stress, the rock pressure of soft rock roadway appears violently, the deformation is large, and the supporting problem of deep buried high stress soft rock roadway becomes more and more prominent. Therefore, it is of great significance to study the deformation and failure mechanism of deep-buried soft rock roadway to control the stability of surrounding rock of roadway. Combined with the characteristics of serious deformation and failure of deep buried coal roadway in Zhaozhuang coal industry, the rheological mechanical parameters of surrounding rock in accordance with the engineering practice are obtained by using the methods of theoretical analysis, field monitoring and numerical calculation, based on the rheological theory and the inverse analysis method. On this basis, the original supporting scheme of deep-buried soft rock roadway is optimized. The main results obtained are summarized as follows: (1) based on linear elasticity theory, the linear elastic analytical solution of roadway deformation is calculated by two kinds of calculation models. On this basis, based on the theoretical derivation of Burgers creep constitutive model, the viscoelastic analytical solution of roadway deformation is obtained. This paper lays the groundwork for inverse analysis and calculation. (2) in view of the problem that the error function of the basic BP neural network algorithm is easily trapped in the local minimum and it is difficult to reach the global minimum, the accuracy of the algorithm is not high in the process of calculation. PSO algorithm is used to correct the shortcomings of BP algorithm. The intelligent back-analysis algorithm with higher accuracy is obtained. (3) in the modified back-analysis algorithm, the field measured data are substituted for the modified back-analysis algorithm, and the mechanical parameters of the surrounding rock Burgers creep model are obtained in accordance with the engineering practice. At the same time, the internal mechanism of the influence of different creep parameters of Burgers model on tunnel deformation is revealed by numerical calculation. (4) on the basis of obtaining the creep mechanical parameters of surrounding rock Burgers model, the creep mechanics parameters of surrounding rock Burgers model are obtained. The influence of different mechanical parameters, grouting time and thickness of grouting reinforcement ring on grouting supporting effect is studied. The analysis shows that it is difficult to get the most reasonable support effect by simply increasing the parameters of a grouting body or some parameter values, and it is necessary to consider comprehensively the influence of each grouting body parameter on the deformation of the roadway. Seeking the most reasonable parameters of grouting support. (5) using grey relational analysis to analyze the supporting effect of roadway under the combination of different mechanical parameters, different grouting time, different grouting reinforcement ring thickness and other factors, and so on. Finally, the reasonable technical parameters of the full-section secondary grouting reinforcement scheme are obtained, and based on this, the engineering design support scheme of the secondary grouting support in the roadway is given.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD353

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