【摘要】：針對淺埋煤層開采周期來壓過程中頂板沿煤壁切落時對支架造成沖擊的現(xiàn)象,根據(jù)基本頂回轉(zhuǎn)切落造成直接頂巖體非線性破壞特征,建立了由基本頂-直接頂-支架-采空區(qū)矸石組成的力學(xué)模型,應(yīng)用突變理論和巖石動力學(xué)方法,推導(dǎo)了直接頂失穩(wěn)前后基本頂切落荷載作用下的支架壓縮量表達(dá)式,分析了頂板切落過程中的動載效應(yīng),獲得了頂板切落條件下支架工作阻力。研究結(jié)果表明:基本頂回轉(zhuǎn)切落和直接頂失穩(wěn)破壞是造成支架沖擊的主因,直接頂巖體變形的突變量決定了沖擊荷載的大小,系統(tǒng)失穩(wěn)時的支架荷載除了與基本頂?shù)闹芷趤韷翰骄�、上覆巖層荷載、直接頂厚度有關(guān)外,還與支架和直接頂巖體的剛度比、直接頂巖體性質(zhì)等因素相關(guān)。
[Abstract]:In view of the phenomenon of roof impact on the support during the mining period of shallow coal seam, according to the nonlinear failure characteristics of the direct roof rock mass caused by the basic roof rotary cutting, A mechanical model consisting of basic top, direct top, support and goaf gangue is established. By using catastrophe theory and rock dynamics method, the expression of support compression under the action of basic top shear load before and after direct top instability is derived. The dynamic load effect in the process of roof cutting is analyzed, and the working resistance of the support is obtained under the condition of roof cutting. The results show that the main causes of the impact are the basic roof rotary cutting and the direct roof instability, and the sudden change of the deformation of the direct roof rock mass determines the magnitude of the impact load. When the system is unstable, the support load is related not only to the periodic pressure step of the basic roof, the overburden load and the direct roof thickness, but also to the stiffness ratio of the support and the direct roof rock mass, and the properties of the direct roof rock mass.
【作者單位】： 中國礦業(yè)大學(xué)(北京)力學(xué)與建筑工程學(xué)院;
【基金】：國家重點基礎(chǔ)研究發(fā)展計劃(973)資助項目(2013CB227903) 國家自然科學(xué)煤炭聯(lián)合基金重點資助項目(U1361209)
【分類號】：TD323;TD355

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