發(fā)布時間：2018-04-28 19:23

  本文選題：淺埋煤層 + 回撤通道��； 參考：《西安科技大學(xué)》2015年碩士論文

【摘要】：對于綜合機(jī)械化采煤工藝而言,工作面搬家倒面是實現(xiàn)高產(chǎn)高效的重要環(huán)節(jié)。由于受到采動影響,回撤通道頂板運(yùn)動明顯,兩幫煤體位移將顯著增大,容易發(fā)生頂板冒落及嚴(yán)重片幫等問題,甚至造成壓架事故,影響礦井正常生產(chǎn)。本文分析了回撤通道在動壓影響下的礦壓顯現(xiàn)規(guī)律,確定回撤通道最有利的頂板破壞形式,同時對不同礦壓控制措施的作用機(jī)理及適用條件進(jìn)行研究,本文研究的主要內(nèi)容和結(jié)論有:(1)回撤通道圍巖壓力分布分為巷道掘進(jìn)階段的圍巖壓力分布、受動采影響階段的圍巖壓力分布以及工作面貫通階段的圍巖壓力分布三個階段。依據(jù)彈塑性理論,確定出了回撤通道受動采影響的起始距離。(2)當(dāng)老頂在貫通前斷裂,貫通后在回撤通道或煤柱上部未發(fā)生再次斷裂,此時巷道處于相對穩(wěn)定階段,支架回撤時受影響相對較小,說明該種頂板破壞形式對巷道穩(wěn)定最為有利。經(jīng)過進(jìn)一步分析,給出了頂板合理斷裂位置的確定公式。(3)建立力學(xué)模型,對老頂—直接頂協(xié)調(diào)變形體系進(jìn)行受力變形分析,推導(dǎo)得出周期來壓步距的函數(shù)關(guān)系式,并分析得出周期來壓步距主要影響因素包括直接頂彈性模量、直接頂厚度、老頂彈性模量、老頂厚度、老頂抗拉強(qiáng)度、上覆巖層厚度。(4)通過對張家峁14204綜采工作面礦壓數(shù)據(jù)進(jìn)行分析,得出周期來壓步距與回采速率的回歸曲線,結(jié)果顯示周期來壓步距隨回采速率的提高有增加,但增加的幅度有所差異。(5)建立了貫通前壓力調(diào)節(jié)時的剩余煤柱力學(xué)分析模型,求解得出剩余煤柱臨界寬度的函數(shù)關(guān)系式。通過因素分析發(fā)現(xiàn),老頂斷裂位置、工作面埋深、巖層間的摩擦角以及采煤高度對剩余煤柱穩(wěn)定性起到關(guān)鍵作用。由于不同的控制措施有其特殊的適用條件,在末采階段應(yīng)根據(jù)老頂實際斷裂情況,采取合理的采煤措施進(jìn)行控制。本文研究為綜采回撤技術(shù)在陜北礦區(qū)的應(yīng)用提供了有益的實踐經(jīng)驗,具有重要的工程實際意義,同時豐富和發(fā)展了礦山壓力控制相關(guān)理論,具有重要的理論意義。
[Abstract]:For comprehensive mechanized coal mining technology, moving face face is an important link to realize high yield and high efficiency. Due to the influence of mining, the roof movement of the withdrawal passage is obvious, the displacement of the two groups of coal bodies will increase significantly, and the roof caving and serious slab cover problems will easily occur, even resulting in a pressure rack accident, which will affect the normal production of the mine. In this paper, the law of rock pressure behavior under the influence of dynamic pressure is analyzed, and the most favorable roof failure form is determined. At the same time, the action mechanism and applicable conditions of different mine pressure control measures are studied. The main contents and conclusions of this paper are as follows: (1) the pressure distribution of the surrounding rock in the withdrawal passage is divided into three stages: the surrounding rock pressure distribution in the tunneling stage, the surrounding rock pressure distribution in the stage affected by dynamic mining and the surrounding rock pressure distribution in the working face through stage. According to the elastic-plastic theory, the starting distance of recoil passage affected by dynamic mining is determined. (2) when the main roof is fractured before transfixion, and there is no refracture in the retreating passage or the upper part of coal pillar after through, the roadway is in a relatively stable stage. When the support is retreated, the influence is relatively small, which indicates that the roof failure is the most favorable to the stability of roadway. Through further analysis, the formula of determining the reasonable fracture position of roof is given. The mechanical model is established, and the stress deformation analysis of the main roof and direct roof coordinated deformation system is carried out, and the functional expression of the periodic pressure step distance is derived. The main influencing factors include direct top elastic modulus, direct top thickness, old top elastic modulus, main roof thickness, and main roof tensile strength. By analyzing the rock pressure data of Zhangjiaomao 14204 fully mechanized mining face, the regression curves of the interval between the periodic pressure step and the mining rate are obtained. The results show that the periodic pressure step increases with the increase of the mining rate. But the amplitude of increase is different. (5) the mechanical analysis model of residual coal pillar under pressure-regulating before transfixion is established, and the function formula of critical width of residual coal pillar is obtained. Through factor analysis, it is found that the position of the main roof fracture, the buried depth of the working face, the friction angle between the strata and the mining height play a key role in the stability of the residual coal pillar. Because different control measures have their special applicable conditions, reasonable coal mining measures should be taken in the stage of final mining according to the actual fracture of the main roof. The research in this paper provides useful practical experience for the application of fully mechanized mining withdrawal technology in the mining area of northern Shaanxi, and has important engineering practical significance. At the same time, it enriches and develops the relevant theories of mine pressure control, which is of great theoretical significance.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD323

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