本文選題：高應(yīng)力　切入點(diǎn)：卸壓槽　出處：《安徽理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：基于高應(yīng)力軟巖巷道易破壞、難支護(hù)的特點(diǎn),從粘彈性力學(xué)分析的基本假設(shè)入手,分析了高應(yīng)力軟巖巷道變形破壞特點(diǎn)并以分析了巷道頂?shù)装逡约皟蓭推茐牡牧W(xué)原因。通過比較高應(yīng)力軟巖巷道變形破壞的控制技術(shù),引入卸壓槽技術(shù),從卸壓槽開挖以后卸壓區(qū)和巷道支承壓力的變化分析出卸壓槽的卸壓機(jī)理,并在前人經(jīng)驗(yàn)的基礎(chǔ)上總結(jié)出卸壓槽合理使用條件。利用FLAC3D數(shù)值模擬軟件和相似模擬試驗(yàn)技術(shù)對卸壓槽在不同埋深、位置、槽體深度和槽口寬度四個參數(shù)條件下的卸壓效果進(jìn)行模擬試驗(yàn),并進(jìn)行槽體的參數(shù)優(yōu)化,得出如下結(jié)論:(1)卸壓槽的卸壓效果隨著礦井埋深的增加而變的越來越好,說明卸壓槽更適用于高埋深、高地應(yīng)力的礦井。(2)卸壓槽通過使巷道周邊圍巖應(yīng)力重新分布,改變巷道周邊圍巖應(yīng)力的集中程度以及轉(zhuǎn)移應(yīng)力集中峰值點(diǎn)來改變巷道周邊圍巖的強(qiáng)度條件,從而對巷道周邊圍巖進(jìn)行弱化,最終達(dá)到保護(hù)巷道穩(wěn)定的目的。(3)通過比較不同參數(shù)下卸壓槽卸壓效果得出卸壓槽最佳優(yōu)化參數(shù):卸壓槽的合理槽深應(yīng)控制在0.5倍的巷道直徑左右,而槽口高度應(yīng)控制在0.15倍的直墻幫高度,卸壓槽在直墻幫上的位置對于巷道變形破壞控制的影響不大,只對于頂板水平集中應(yīng)力的峰值點(diǎn)有影響。
[Abstract]:Based on the characteristics of high stress soft rock roadway which is easy to destroy and difficult to support, this paper starts with the basic assumption of viscoelastic mechanics analysis. This paper analyzes the characteristics of deformation and failure of roadway with high stress and soft rock, and analyzes the mechanical reasons of roof and floor and two sides of roadway failure. By comparing the control technology of deformation and failure of roadway with high stress soft rock, the technology of pressure relief trough is introduced. The pressure relief mechanism of the pressure relief groove is analyzed from the variation of the pressure relief zone and the supporting pressure of the roadway after the excavation of the pressure relief groove. On the basis of the previous experience, the reasonable operating conditions of the pressure relief tank are summarized. Using the FLAC3D numerical simulation software and the similar simulation test technology, the pressure relief tank is buried in different depth and position. The pressure relief effect is simulated under four parameters of tank depth and slot width, and the optimization of tank parameters is carried out. It is concluded that the pressure relief effect of pressure relief groove becomes better and better with the increase of mine depth. It shows that the pressure relief groove is more suitable for the mine with high buried depth and high ground stress. Changing the concentration degree of surrounding rock stress and the peak point of transfer stress concentration to change the intensity condition of surrounding rock of roadway, thus weakening the surrounding rock around roadway. Finally, the purpose of protecting roadway stability is to reach the goal of protecting roadway stability. By comparing the pressure relief effect of the pressure relief groove with different parameters, the optimum parameters of the pressure relief groove are obtained: the reasonable depth of the pressure relief groove should be controlled at about 0.5 times the diameter of the roadway. The height of the slot should be controlled at 0.15 times of the height of the vertical wall, and the position of the pressure relief groove on the vertical wall has little effect on the control of roadway deformation and failure, but only on the peak point of the horizontal concentrated stress of the roof.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD322.5

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