【摘要】：露天轉(zhuǎn)地下開采的邊坡及上覆巖體的移動、變形及其對周邊環(huán)境破壞等問題已成為嚴(yán)重影響生產(chǎn)和環(huán)境安全最突出問題之一。本文以北京市密云云冶露天轉(zhuǎn)地下開采鐵礦為工程背景,在綜合礦山地質(zhì)資料和實地地質(zhì)條件調(diào)查基礎(chǔ)上,針對上峪礦開采過程進(jìn)行三維數(shù)值模擬研究和理論分析,探索露天轉(zhuǎn)地下急傾斜礦體開采過程中上覆巖體的破壞機(jī)理、移動變形規(guī)律；基于臨界滑動場技術(shù)確定邊坡臨界滑動面,應(yīng)用三種極限平衡理論對邊坡穩(wěn)定性進(jìn)行了評價和失穩(wěn)災(zāi)害分析、預(yù)測和不同變形區(qū)的區(qū)劃,并給出相應(yīng)的防控措施。主要研究成果如下： 1)利用MIDAS-3D建立了礦區(qū)的三維數(shù)值模擬模型；通過對不同開采區(qū)域、開采過程的數(shù)值模擬研究,系統(tǒng)總結(jié)了應(yīng)力場、位移場的分布特征和變化規(guī)律。 2)綜合比較不同開采步距、不同開采位置和不同開采量條件下應(yīng)力場和位移場的分布特點與異同性,揭示了急傾斜礦體露天轉(zhuǎn)地下開采時上覆邊坡巖體的滑移機(jī)制和形變特點；系統(tǒng)研究了邊坡體的滑移破壞模式和移動特征,并對山體穩(wěn)定性進(jìn)行了評價,得出在露天與地下開采疊加效應(yīng)影響下山體和露天邊坡穩(wěn)定狀態(tài)的安全儲備急劇減小,上峪礦區(qū)山體與露天邊坡面臨著產(chǎn)生大型滑坡的可能性。 3)通過模擬不同空間和區(qū)域的開采,系統(tǒng)研究了不同深度上的應(yīng)力場和位移場的變化特點和演變規(guī)律,得到了礦區(qū)的危險范圍的動態(tài)演變圖,并對易發(fā)生的災(zāi)害提出了相應(yīng)的防控措施。
[Abstract]:The movement, deformation and environmental damage of slope and overlying rock mass from open pit to underground mining have become one of the most prominent problems which seriously affect production and environmental safety. Based on the engineering background of Beijing Miyun Yunye opencast to underground mining, on the basis of comprehensive geological data and on-the-spot geological conditions investigation, this paper carries out three-dimensional numerical simulation and theoretical analysis on the mining process of Shangyu Mine. To explore the failure mechanism of overlying rock mass and the law of movement and deformation in the mining process of steep inclined orebody from open pit to underground; The critical slip surface of slope is determined based on critical slip field technology. The stability of slope is evaluated and the instability disaster is analyzed by using three limit equilibrium theories, and the zoning of different deformation zones is predicted, and the corresponding prevention and control measures are given. The main research results are as follows: 1) the three-dimensional numerical simulation model of mining area is established by using MIDAS-3D; Through the numerical simulation of different mining areas and mining process, the distribution characteristics and variation rules of stress field and displacement field are summarized systematically. 2) to compare the distribution characteristics and differences of stress field and displacement field under different mining steps, different mining positions and different mining quantities. The slip mechanism and deformation characteristics of overlying slope rock mass during open-pit mining of steeply inclined orebody are revealed. The sliding failure mode and movement characteristics of slope body are studied systematically, and the stability of mountain body is evaluated. It is concluded that the safety reserve of mountain body and open-pit slope under the influence of overlaying effect of open-pit and underground mining decreases sharply. The mountain mass and open-pit slope in Shangyu mining area are faced with the possibility of large-scale landslide. 3) by simulating mining in different spaces and regions, the variation characteristics and evolution rules of stress field and displacement field at different depths are systematically studied, and the dynamic evolution map of the dangerous range of the mining area is obtained. At the same time, the corresponding prevention and control measures are put forward for the disasters which are easy to occur.
【學(xué)位授予單位】：北方工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD325

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