本文選題：東峰煤礦 + 地面變形��； 參考：《西安科技大學(xué)》2017年碩士論文

【摘要】：論文以府谷縣東峰煤礦采空區(qū)為研究對(duì)象,在收集研究區(qū)相關(guān)地質(zhì)資料的基礎(chǔ)上,分析采空區(qū)上部巖層及地表移動(dòng)變形特征與影響因素。根據(jù)概率積分法,對(duì)研究區(qū)的地表移動(dòng)變形值進(jìn)行了理論計(jì)算,在FLAC3D數(shù)值模擬軟件的支持下,對(duì)煤層開(kāi)采所引起的地表移動(dòng)變形進(jìn)行了數(shù)值模擬,以此得到以下幾點(diǎn)結(jié)論:(1)通過(guò)對(duì)研究區(qū)的開(kāi)采歷史與現(xiàn)狀分析,對(duì)地表移動(dòng)變形現(xiàn)狀與特征、地表變形形式與影響范圍等進(jìn)行了總結(jié)闡述。研究區(qū)地表變形主要有地面塌陷和地裂縫兩種,地面塌陷大多呈不規(guī)則的長(zhǎng)方形。(2)在上述工作的基礎(chǔ)上,運(yùn)用概率積分法對(duì)地表移動(dòng)變形參數(shù)以及變形值進(jìn)行理論計(jì)算,地表移動(dòng)變形最大沉降量為3.905m比實(shí)際監(jiān)測(cè)的最大下沉值3.14m偏大0.865m,并分析其偏大原因。并通過(guò)相同方法對(duì)研究區(qū)未來(lái)開(kāi)采所引起的地表移動(dòng)變形進(jìn)行了預(yù)測(cè),分析研究區(qū)未來(lái)的地表移動(dòng)變形形式。(3)在FLAC3D數(shù)值模擬軟件的基礎(chǔ)上,通過(guò)彈性求解法得到了初始應(yīng)力場(chǎng)與初始應(yīng)力場(chǎng)最大不平衡力變化規(guī)律;通過(guò)下沉位移云圖和下沉變化位移曲線圖分析得出,煤層開(kāi)采后,開(kāi)采沉降量與地表影響范圍都隨開(kāi)采量的增加逐漸增大,開(kāi)采初期,采空區(qū)上部巖層下沉變形關(guān)于采空區(qū)對(duì)稱,靠近切眼的監(jiān)測(cè)點(diǎn)其下沉速度大于遠(yuǎn)離切眼。隨著進(jìn)一步開(kāi)采,地表下沉變形關(guān)于采空區(qū)對(duì)稱,采空區(qū)周圍巖層變形向掘進(jìn)反方向偏移,靠近切眼的監(jiān)測(cè)點(diǎn)其下沉速度逐漸減小,離切眼較遠(yuǎn)的監(jiān)測(cè)點(diǎn)下沉速度逐漸增大;通過(guò)水平變形云圖和水平位移變化曲線圖分析可得,地表水平變形關(guān)于采空區(qū)對(duì)稱,地表變形范圍與變形量隨著開(kāi)采的推進(jìn)增大,采空區(qū)中心的水平位移為零。開(kāi)采初期,地表水平方向的變形速度較快,采空區(qū)兩側(cè)的監(jiān)測(cè)點(diǎn)向采空區(qū)上部地表區(qū)域移動(dòng)。關(guān)于采空區(qū)對(duì)稱的兩點(diǎn)位移大小相同,越靠近外側(cè)的監(jiān)測(cè)點(diǎn)其移動(dòng)變形值越大。隨著開(kāi)采的推進(jìn),地表水平變形向開(kāi)采前進(jìn)方向偏移。
[Abstract]:This paper takes the goaf of Dongfeng Coal Mine in Fugu County as the research object and analyzes the deformation characteristics and influencing factors of the upper strata and surface movement of the goaf on the basis of collecting the relevant geological data of the study area. According to probabilistic integration method, the surface movement deformation of the study area is calculated theoretically, and the surface movement deformation caused by coal seam mining is numerically simulated with the support of FLAC3D numerical simulation software. Based on the analysis of mining history and present situation in the study area, the present situation and characteristics of surface movement and deformation, the form and influence range of surface deformation are summarized and expounded. There are mainly two kinds of ground subsidence and ground fissure in the study area, most of which are irregular rectangle. (2) on the basis of the above work, the probability integral method is used to calculate the deformation parameters and the deformation value of the ground movement. The maximum subsidence of surface movement and deformation is 3.905m, which is 0.865 m higher than that of the monitored maximum subsidence value of 3.14 m, and the reasons are analyzed. The surface movement deformation caused by the future mining in the study area is predicted by the same method. The future surface movement deformation form of the study area is analyzed based on the FLAC3D numerical simulation software. The law of maximum unbalanced force of initial stress field and initial stress field is obtained by means of elastic solution method, and through the analysis of subsidence displacement cloud diagram and subsidence displacement curve, it is concluded that after coal seam mining, the maximum unbalance force of initial stress field and initial stress field is changed. At the beginning of mining, the subsidence of the upper strata of the goaf is symmetrical to the goaf, and the subsidence velocity of the monitoring point near the cutting hole is larger than that of the far hole cutting. With the further mining, the subsidence deformation of the surface is symmetrical to the goaf, the deformation of the rock layer around the goaf is shifted to the reverse direction of the excavation, the subsidence velocity of the monitoring point near the cutting hole decreases gradually, and the subsidence velocity of the monitoring point farther away from the cut hole increases gradually. Through the analysis of the cloud map of horizontal deformation and the curve of change of horizontal displacement, it can be obtained that the horizontal deformation of the surface is symmetrical to the goaf, the range and quantity of surface deformation increase with the advance of mining, and the horizontal displacement of the center of goaf is zero. In the early stage of mining, the deformation speed of surface horizontal direction is faster, and the monitoring points on both sides of goaf move to the upper surface area of goaf. The symmetrical two point displacement of the goaf is the same, and the displacement value of the monitoring point closer to the outside is larger. With the development of mining, the horizontal deformation of the surface deviates to the forward direction of mining.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD325

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本文編號(hào)：1961332