本文選題：平衡支護技術(shù) + 支護效率系數(shù)　； 參考：《山東科技大學(xué)》2017年碩士論文

【摘要】：本文通過對沿空采掘巷道圍巖的形變特性研究,對圍巖失穩(wěn)力學(xué)原理、高強預(yù)應(yīng)力讓壓錨桿、圍巖主動控制技術(shù)、平衡支護技術(shù)、動態(tài)平衡支護理論分析,通過有限元計算優(yōu)化巷道支護參數(shù)。通過工程實例對該支護系統(tǒng)的合理性進行評價,并進一步優(yōu)化了巷道的支護參數(shù)。首先,通過分析了圍巖變形和支護抗力的相互作用,煤柱內(nèi)應(yīng)力分布規(guī)律,確定了窄煤柱護巷的可行性,留設(shè)4.5-5m窄小煤柱;其次,分析了錨桿支護系統(tǒng)的效率系數(shù)和高強預(yù)應(yīng)力讓壓錨桿的作用機理,通過設(shè)置高強預(yù)應(yīng)力讓壓錨桿的讓壓參數(shù)來增大支護系統(tǒng)的支護作用實現(xiàn)主控支護;第三,提出了平衡支護技術(shù)和動態(tài)平衡支護理論,運用平衡支護技術(shù)和動態(tài)平衡支護理論分析確定,采用支護構(gòu)造的非對稱性布置提高沿空側(cè)的支護效果,保證了巷道圍巖穩(wěn)定性的支護方案;第四,考慮4采區(qū)的煤層賦存條件和開采地質(zhì)特性,運用錨網(wǎng)索聯(lián)合支護,根據(jù)兩幫圍巖分布特征,幫部采用非對稱布置,綜合分析,決定對該巷道工作面采用錨網(wǎng)(索)支護的初步設(shè)計方案。通過現(xiàn)場觀測情況,分析了四采區(qū)輔助軌道巷的綜合支護效果。動壓巷道的頂?shù)装遄冃尉诤侠矸秶鷥?nèi),巷道支護效果較好,證明平衡支護技術(shù)可以有效應(yīng)對動壓巷道難以支護的問題,使巷道圍巖的應(yīng)力和位移均達到了平衡。
[Abstract]:In this paper, the deformation characteristics of surrounding rock of roadway along goaf are studied, and the theory of instability mechanics of surrounding rock, high strength prestressing anchor, active control technology of surrounding rock, balance support technology and dynamic equilibrium support theory are analyzed. The supporting parameters of roadway are optimized by finite element calculation. The rationality of the support system is evaluated by an engineering example, and the supporting parameters of the roadway are further optimized. Firstly, by analyzing the interaction between surrounding rock deformation and support resistance, and the distribution law of stress in coal pillar, the feasibility of protecting roadway with narrow coal pillar is determined, and the narrow coal pillar with 4.5-5m narrow pillar is set up. This paper analyzes the efficiency coefficient of bolting system and the mechanism of high-strength pre-stressed pressure-bearing bolt. By setting the parameters of high-strength pre-stressed pressure-bearing bolt to increase the supporting function of the supporting system, the main control support can be realized. The balanced support technology and the dynamic equilibrium support theory are put forward. The balanced support technology and the dynamic equilibrium support theory are used to analyze and determine, and the asymmetrical arrangement of the supporting structure is adopted to improve the support effect along the gob side. The supporting scheme to ensure the stability of surrounding rock of roadway is given. Fourthly, considering the coal seam occurrence condition and mining geological characteristics in No. 4 mining area, the combined support of anchor, mesh and cable is used, according to the distribution characteristics of the surrounding rock of the two groups, the asymmetric arrangement is adopted in the side wall, and the comprehensive analysis is made. It is decided that the preliminary design scheme of anchor mesh (cable) support should be used in the roadway face. Through field observation, the comprehensive support effect of auxiliary track lane in four mining areas is analyzed. The roof and floor deformation of the dynamic pressure roadway is in the reasonable range, and the roadway support effect is better. It is proved that the balanced support technology can effectively deal with the problem that the dynamic pressure roadway is difficult to support, which makes the stress and displacement of the surrounding rock of the roadway reach balance.
【學(xué)位授予單位】：山東科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD353

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本文編號：1910288