本文選題：弱膠結(jié)覆巖高強(qiáng)度開采 + 現(xiàn)場實測　； 參考：《中國礦業(yè)大學(xué)》2017年碩士論文

【摘要】：本文以營盤壕煤礦2201工作面地質(zhì)采礦條件為依托原型,采用實測數(shù)據(jù)分析、數(shù)值模擬實驗與相似材料模擬實驗相結(jié)合的方法,對弱膠結(jié)覆巖高強(qiáng)度開采下的地表與巖層移動變形規(guī)律進(jìn)行了研究,取得的主要研究成果如下:1)對營盤壕礦區(qū)巖層進(jìn)行實地取樣并進(jìn)行力學(xué)實驗,實驗表明90%的巖層抗壓強(qiáng)度均低于30MP,且?guī)r層結(jié)構(gòu)均以泥質(zhì)膠結(jié)為主,具有膠結(jié)性差、易風(fēng)化、對擾動敏感等物理特性,故確定了營盤壕礦區(qū)上覆巖層均屬于弱膠結(jié)性巖層。2)根據(jù)現(xiàn)場實測數(shù)據(jù)繪制出了地表移動變形曲線圖,揭示了弱膠結(jié)覆巖地表動態(tài)移動變形的變化規(guī)律;并進(jìn)一步詳細(xì)對比分析了營盤壕煤礦與臨近的小紀(jì)汗煤礦的地質(zhì)采礦參數(shù)與巖層結(jié)構(gòu),采用類比法確定了營盤壕煤礦2201工作面地表預(yù)計參數(shù)大小。3)采用數(shù)值模擬實驗研究了一次性采全高與分層開采兩種開采方式下的地表與覆巖移動變形規(guī)律以及覆巖內(nèi)部應(yīng)力場、塑性區(qū)變化規(guī)律,揭示了在弱膠結(jié)覆巖地層條件下更適合一次性采全高的開采方式,為2201工作面實際開采時提供了理論支撐。4)將理論分析與相似材料模擬實驗結(jié)果相結(jié)合,得出了直接頂應(yīng)力隨著距離開切眼距離的不同而呈現(xiàn)不同類型函數(shù)的變化規(guī)律;且在高圍壓狀態(tài)下,弱膠結(jié)覆巖由于自身物理性質(zhì)而易產(chǎn)生假塑性彎曲,這些“假塑性體”內(nèi)部產(chǎn)生了與正應(yīng)力呈不同角度的裂隙,依然可以看成為兩端固定,中間懸空的“簡支梁”平衡結(jié)構(gòu);對于地表移動變形而言,下沉曲線收斂速度較一般地質(zhì)采礦條件下的地表下沉曲線收斂速度慢,且下沉值偏小。5)以弱膠結(jié)覆巖巖層動態(tài)移動過程為研究基礎(chǔ),建立了弱膠結(jié)覆巖開采巖層移動力學(xué)模型。并以該力學(xué)模型為理論依據(jù),結(jié)合材料力學(xué)相關(guān)知識,推導(dǎo)出了新的弱膠結(jié)覆巖開采垮落帶發(fā)育高度的預(yù)測方法。6)理論分析了弱膠結(jié)覆巖地表下沉系數(shù)遠(yuǎn)遠(yuǎn)小于我國東部軟巖條件下開采的經(jīng)驗下沉系數(shù)的四個因素。三個次要因素:弱膠結(jié)覆巖水化膨脹因素、似“覆巖離層注漿”因素、沖洪積砂的流動性因素;一個主要因素:巖層的巨厚特性因素。巖層巨厚的特點使得其在巖層移動變形向地表傳遞的過程中形成了類似于東部煤礦堅硬巖層的抗變形的作用。
[Abstract]:Based on the conditions of Ying Hao coal mine 2201 working face of geological and mining based on the prototype, using data analysis, numerical simulation and similar material simulation method combining experiment, studied the deformation regularity of weakly cemented rock high intensity mining under surface and strata movement, the main research achievements are as follows: 1) field samples of rock and mining camp trench mechanics experiment, experiment shows that rock compressive strength of 90% is lower than that of 30MP, and all strata structure by clay cementation. With poor cementation, easy weathering, sensitive to disturbance and other physical properties, so to determine the Ying Hao strata belong to the mining area of the rock cemented.2) according to the measured data to draw out the surface movement and deformation curves, reveal the regularity of weakly cemented rock dynamic surface movement and deformation; and further detailed comparative analysis of the coal mine and camp Hao Lin Geological parameters and rock structure near Xiaojihan coal mine, by analogy to determine the surface Ying Hao coal mine 2201 working face prediction parameters of size.3) was studied by one-time mining surface and overburden mobile high slice mining and two kinds of mining methods and the deformation of overburden internal stress field numerical the plastic zone change rules, revealed in the overburden strata under the condition of weak cementation is more suitable for disposable fully mechanized mining method, provides a theoretical support for the practice of 2201 working face.4 mining) combining the theoretical analysis with the similar material simulation experiment results have been obtained directly with the distance from the left top stress cut from different types of functions; and in high confining pressure, weak cementation of overlying rock due to its physical properties and is easy to produce fake plastic bending, these "fake plastic body and is internally generated The stress in different angle fracture, still can be seen as fixed at both ends of intermediate "hanging beam" balance structure; for surface deformation, surface subsidence curve convergence rate than the general conditions of Geology and mining subsidence curve of slow convergence and subsidence value is small.5) with weak cementation of overlying rock strata dynamic moving process based on the established unconsolidated mining overburden rock strata movement mechanics model. And the mechanical model as the theoretical basis, combined with the material mechanics knowledge, deduces the new weak rock cementation mining caving zone development prediction method of highly.6) theoretical analysis in unconsolidated overburden subsidence coefficient is less than four a factor of experience mining soft rock conditions in eastern China under the sink coefficient. Three main factors: weak cemented rock hydration expansion factors, like "overburden grouting" factors, alluvial sand flow One of the main factors; factors: thick characteristic factors of strata. The thick rock characteristics resulted in similar to the eastern coal mine hard rock anti deformation process of the deformation in the transfer to the surface rock movement.

【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】：2017
【分類號】：TD325

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