發(fā)布時(shí)間：2018-08-24 10:20

【摘要】：承壓水上開采,底板采動(dòng)巖體裂隙在流固耦合作用下發(fā)育、擴(kuò)展貫通,最終誘發(fā)底板突水,嚴(yán)重威脅著礦井的安全生產(chǎn)。長(zhǎng)期以來,國(guó)內(nèi)學(xué)者對(duì)水平及近水平煤層底板采動(dòng)破壞特征及突水機(jī)理開展了大量的研究工作,取得了豐碩的理論成果,雖然對(duì)礦井水害的預(yù)測(cè)及防治發(fā)揮了重要作用,但對(duì)傾斜煤層底板的變形破壞特征及滲流特性的研究還不夠完善。因此,本文采用理論分析、數(shù)值模擬以及現(xiàn)場(chǎng)實(shí)測(cè)相結(jié)合的方法,對(duì)傾斜煤層底板采動(dòng)破壞特征以及礦井底板突水的危險(xiǎn)性進(jìn)行了系統(tǒng)性研究,并取得如下創(chuàng)新性成果:(1)基于半無(wú)限體理論及莫爾-庫(kù)倫破壞準(zhǔn)則,考慮了底板承壓水壓以及煤層傾角對(duì)采動(dòng)底板的影響效應(yīng),結(jié)合傾斜煤層走向長(zhǎng)壁開采時(shí)煤層采動(dòng)底板支承壓力分布規(guī)律,分別建立了傾斜煤層底板采動(dòng)應(yīng)力和破壞深度求解力學(xué)模型,推導(dǎo)計(jì)算了傾斜煤層采動(dòng)底板內(nèi)任一點(diǎn)處的水平應(yīng)力、剪應(yīng)力大小以及采動(dòng)底板最大破壞深度。(2)按照正交試驗(yàn)設(shè)計(jì)方案,對(duì)傾斜煤層工作面底板破壞深度進(jìn)行FLAC~3D數(shù)值模擬,對(duì)模擬結(jié)果分別進(jìn)行矩陣分析和方差分析,確定了各主控因素對(duì)底板破壞深度的敏感性大小,給出了正交模擬試驗(yàn)的最優(yōu)方案,即按照此方案實(shí)施后底板破壞深度最小,有效降低了礦井底板突水的危險(xiǎn)性。(3)根據(jù)薄板理論,建立了傾斜煤層底板隔水關(guān)鍵層撓度求解力學(xué)模型,計(jì)算了傾斜煤層底板隔水關(guān)鍵層的撓度值,結(jié)合彈性力學(xué)中的莫爾-庫(kù)倫破壞準(zhǔn)則,求得了傾斜煤層底板隔水關(guān)鍵層任一點(diǎn)處的突水力學(xué)判據(jù)表達(dá)式。(4)對(duì)底板突水主控因素分別進(jìn)行了主成分logistic回歸分析和logistic回歸分析�；貧w分析結(jié)果表明,主成分logistic回歸分析的平均正確率較logistic回歸分析的平均正確率高10%左右�；谥鞒煞謑ogistic回歸分析,建立的底板突水回歸模型的平均正確率較高,結(jié)合礦井實(shí)際開采地質(zhì)參數(shù),在一定程度上可以對(duì)傾斜煤層底板突水情況進(jìn)行定性預(yù)測(cè)。(5)基于FLAC~3D數(shù)值仿真軟件,建立了承壓水上傾斜煤層底板流固耦合數(shù)值計(jì)算模型,模擬分析了工作面回采過程中,傾斜煤層底板孔隙水壓力及滲流矢量的動(dòng)態(tài)演化過程,確定了工作面底板的突水高危區(qū),為傾斜煤層底板突水預(yù)測(cè)及防治提供了理論依據(jù)。(6)繪制了 3303工作面底板隔水關(guān)鍵層撓度函數(shù)的三維撓曲面以及底板撓度函數(shù)f(x,y)的等值線云圖,求得了 3303工作面底板隔水關(guān)鍵層第一突水點(diǎn)處的突水力學(xué)判據(jù)表達(dá)式f(x0,y0),并給出了該工作面底板隔水關(guān)鍵層所承受的最大極限水壓值。
[Abstract]:Under the action of fluid-solid coupling, the rock fissures in the floor mining are developed under the action of fluid-solid coupling, which eventually induces the water inrush of the bottom plate, which seriously threatens the safety of mine production. For a long time, domestic scholars have carried out a great deal of research work on the mining failure characteristics and water inrush mechanism of horizontal and near-horizontal coal seam floor, and obtained abundant theoretical results, although they have played an important role in the prediction and prevention of mine water damage. However, the study of deformation, failure and seepage characteristics of inclined seam floor is not perfect. Therefore, by using the methods of theoretical analysis, numerical simulation and field measurement, the characteristics of mining failure of inclined coal seam floor and the danger of water inrush from mine floor are systematically studied in this paper. The results are as follows: (1) based on the semi-infinite body theory and Mohr-Coulomb failure criterion, the effect of floor pressure water pressure and seam inclination on mining floor is considered. Combined with the supporting pressure distribution law of seam mining floor during longwall mining of inclined coal seam, a mechanical model for solving mining stress and failure depth of inclined coal seam floor is established, respectively. The horizontal stress, shear stress and maximum failure depth of mining floor at any point in inclined coal seam mining floor are deduced and calculated. (2) according to the orthogonal experimental design scheme, the FLAC~3D numerical simulation is carried out on the floor failure depth of inclined coal seam working face. The matrix analysis and variance analysis of simulation results are carried out, and the sensitivity of each main control factor to the depth of floor failure is determined. The optimal scheme of orthogonal simulation test is given, that is, the minimum damage depth of bottom plate is obtained after the implementation of this scheme. (3) based on the thin plate theory, a mechanical model for solving the deflection of the key layer of the inclined coal seam floor is established, and the deflection value of the key layer of the inclined coal seam floor is calculated. Combined with the Mohr Coulomb failure criterion in elastic mechanics, the criterion expression of hydraulic inrush at any point in the key layer of water barrier in inclined coal seam floor is obtained. (4) the principal component logistic regression analysis and logistic regression analysis are carried out for the main controlling factors of water inrush in the floor respectively. The results of regression analysis show that the average correct rate of principal component logistic regression is about 10% higher than that of logistic regression. Based on the principal component logistic regression analysis, the average correct rate of the regression model of floor water inrush is higher, which combines with the actual mining geological parameters. To some extent, it can be used to predict the water inrush from the inclined coal seam floor. (5) based on the FLAC~3D numerical simulation software, the fluid-solid coupling numerical calculation model of the inclined coal seam floor on the confined water is established, and the mining process of the working face is simulated and analyzed. The dynamic evolution process of pore water pressure and percolation vector of inclined coal seam floor has determined the high risk area of water inrush in the floor of working face. It provides a theoretical basis for water inrush prediction and prevention of inclined seam floor. (6) drawing the three-dimensional flexural surface of the deflection function of the key layer of the bottom plate of 3303 working face and the isoline cloud map of the deflection function f (XY) of the floor plate. The expression of hydraulic inrush criterion f (x0 / y 0) at the first water inrush point of the key layer of the bottom plate of 3303 working face is obtained, and the maximum limit water pressure of the key layer of the bottom plate of the working face is given.
【學(xué)位授予單位】：山東科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD745.2

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本文編號(hào)：2200517