【摘要】：露天采場(chǎng)礦邊坡工程是以巖體為工程材料和工程結(jié)構(gòu)。采礦作業(yè)為施工手段而形成的大型巖體工程。隨著露天開(kāi)采深度的增加,邊坡高度不斷加大,逐步形成高陡露天邊坡,使采掘生產(chǎn)、邊坡維護(hù)難度不斷加大。所以如何對(duì)邊坡礦邊坡進(jìn)行合理的穩(wěn)定性分析逐漸成專門(mén)的研究課題。本文的主要工作為以青海某露天礦采場(chǎng)邊坡工程為研究對(duì)象,著重研究其穩(wěn)定性分析,其次根據(jù)穩(wěn)定性分析結(jié)果提出針對(duì)性的合理的治理意見(jiàn),以保障礦山的安全生產(chǎn)。本文重點(diǎn)研究穩(wěn)定性分析兩個(gè)主要問(wèn)題,一是如何獲取巖體的力學(xué)參數(shù),本文采用費(fèi)辛柯法、格吉法、經(jīng)驗(yàn)參數(shù)法對(duì)土工試驗(yàn)成果進(jìn)行分析、統(tǒng)計(jì)、類(lèi)比,獲得了邊坡穩(wěn)定性分析計(jì)算所用的摩爾-庫(kù)倫模型基本參數(shù)。另一問(wèn)題是穩(wěn)定性分析的方法選擇,本文首先通過(guò)已有的地質(zhì)災(zāi)害、地質(zhì)勘探資料、土工試驗(yàn)基礎(chǔ)上,對(duì)采場(chǎng)邊坡進(jìn)行工程地質(zhì)分區(qū),結(jié)合野外觀察綜合給定了邊坡的破壞模式,通過(guò)目前常用的余推力法、簡(jiǎn)化Bishop法進(jìn)行邊坡的穩(wěn)定性分析計(jì)算得出邊坡穩(wěn)定安全系數(shù),通過(guò)單純形加速法等潛在滑動(dòng)面的優(yōu)化方法確定潛在滑動(dòng)面,分別對(duì)現(xiàn)狀、原設(shè)計(jì)、調(diào)整邊坡結(jié)構(gòu)參數(shù)后的邊坡穩(wěn)定性分析計(jì)算得出安全系數(shù)和潛在滑動(dòng)面。同時(shí)通過(guò)采用強(qiáng)度折減有限元法(ABAQUS數(shù)值分析軟件)對(duì)邊坡進(jìn)行靜態(tài)的穩(wěn)定性分析,通過(guò)邊坡應(yīng)力應(yīng)變數(shù)值分析,定量地給出了銅礦邊坡應(yīng)力集中部位及應(yīng)力應(yīng)變水平,為邊坡穩(wěn)定狀態(tài)的又一定量評(píng)價(jià)指標(biāo)。通過(guò)強(qiáng)度折減有限元法、極限平衡法在邊坡穩(wěn)定性計(jì)算結(jié)果進(jìn)行分析比較,得出了一致的結(jié)論。最后根據(jù)穩(wěn)定情況簡(jiǎn)單討論了經(jīng)濟(jì)合理的工程對(duì)策。本文的研究結(jié)果對(duì)采場(chǎng)的穩(wěn)定性及后續(xù)生產(chǎn)具有實(shí)際意義。
[Abstract]:The slope engineering of open pit stope takes rock mass as engineering material and engineering structure. A large rock mass project formed by mining operations as a means of construction. With the increase of the depth of open-pit mining, the slope height is increasing, and the high and steep open-pit slope is gradually formed, which makes the excavation production and slope maintenance more difficult. Therefore, how to analyze the slope stability gradually becomes a special research topic. The main work of this paper is to take the slope engineering of an open pit mine in Qinghai as the research object, focusing on the analysis of its stability, and then, according to the results of the stability analysis, to put forward some pertinent and reasonable management opinions in order to ensure the safety of mine production. This paper focuses on two main problems of stability analysis. One is how to obtain the mechanical parameters of rock mass. In this paper, the results of geotechnical tests are analyzed, counted, and compared with the results of geotechnical tests by using Fisinco method, Gigi method and empirical parameter method. The basic parameters of the Moll-Coulomb model used in slope stability analysis are obtained. The other problem is how to choose the method of stability analysis. Firstly, based on the existing geological hazards, geological exploration data and geotechnical tests, engineering geological zoning of stope slope is carried out in this paper. Combined with the field observation, the failure mode of the slope is comprehensively given, and the slope stability safety coefficient is obtained by simplified Bishop method and the residual thrust method, which is commonly used at present. The potential slip surface is determined by the optimization method of simplex acceleration method, and the safety factor and potential sliding surface are calculated by analyzing and calculating the slope stability after the current situation, original design and adjustment of slope structural parameters. At the same time, the static stability analysis of the slope is carried out by using the strength reduction finite element method (ABAQUS), and the stress concentration and stress strain level of the copper slope are quantitatively given through the numerical analysis of the slope stress and strain. It is also a certain evaluation index of slope stability. By means of strength reduction finite element method and limit equilibrium method, the results of slope stability calculation are analyzed and compared, and a consistent conclusion is drawn. Finally, the economic and reasonable engineering countermeasures are briefly discussed according to the stable situation. The results of this paper have practical significance for stope stability and subsequent production.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TD854.6

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本文編號(hào)：2193117