本文選題：露天煤礦 + 邊坡穩(wěn)定性��； 參考：《昆明理工大學(xué)》2015年碩士論文

【摘要】：露天煤礦生產(chǎn)過(guò)程中邊坡的穩(wěn)定和安全直接關(guān)系到礦山企業(yè)生命和財(cái)產(chǎn)安全,是保證礦山正常生產(chǎn)的先決條件。邊坡失穩(wěn)的原因是多方面的,水是誘發(fā)滑坡破壞最主要的外因。本文以某露天礦大量工程地質(zhì)勘察資料和邊坡巖體特性分析為基礎(chǔ),進(jìn)行了北幫高邊坡滑坡破壞機(jī)理研究,并運(yùn)用飽和-非飽和滲流理論和降雨入滲理論,通過(guò)SEEP/W數(shù)值模擬軟件對(duì)膨脹性軟巖邊坡在降雨入滲條件下滲流場(chǎng)分析,然后將計(jì)算出來(lái)的瞬態(tài)滲流場(chǎng)結(jié)果與極限平衡法相結(jié)合,對(duì)邊坡穩(wěn)定性進(jìn)行分析研究,探討了不同因素對(duì)穩(wěn)定性的影響。最后針對(duì)北幫邊坡滑移變形特點(diǎn)簡(jiǎn)要提出邊坡治理措施。本文主要從以下幾個(gè)方面開(kāi)展研究。1、以達(dá)西定律為基礎(chǔ),分析飽和—非飽和滲流微分方程以及飽和—非飽和滲流方程計(jì)算定解條件,以此作為后續(xù)有限元降雨入滲數(shù)值模擬的計(jì)算基礎(chǔ)。2、通過(guò)分析露天煤礦所處工程地質(zhì)條件、水文地質(zhì)條件、結(jié)合巖樣的室內(nèi)力學(xué)試驗(yàn)和野外現(xiàn)場(chǎng)試驗(yàn)的成果,探討邊坡變形特征和破壞機(jī)理。揭示北幫膨脹性軟巖邊坡的變形破壞遵循“脹縮開(kāi)裂—浸水軟化—滑移”的循環(huán)規(guī)律。3、用有限元數(shù)值模擬軟件,在滲流分析中考慮裂隙和不考慮裂隙兩種情況下降雨滲流場(chǎng)對(duì)比分析,結(jié)果表明不考慮膨脹性軟巖裂隙影響,大雨3天后,降雨作用下,孔隙水壓力在2米以下基本不受影響,由此可見(jiàn)北幫膨脹性軟巖邊坡降雨滲流分析考慮裂隙存在對(duì)于邊坡穩(wěn)定的影響更為合理。4、利用SEEP/W有限元分析軟件對(duì)邊坡進(jìn)行滲流場(chǎng)分析,并把分析結(jié)果與極限平衡法結(jié)合,研究了降雨強(qiáng)度、降雨歷時(shí)和滲透系數(shù)大小對(duì)于膨脹性軟巖邊坡穩(wěn)定性影響的程度,得出了降雨強(qiáng)度、降雨歷時(shí)及滲透系數(shù)大小對(duì)邊坡安全系數(shù)的影響規(guī)律。
[Abstract]:The stability and safety of slope in opencast coal mine production process is directly related to the safety of life and property of mining enterprises and is the prerequisite to ensure the normal production of mines. There are many reasons for slope instability, and water is the main external cause of landslide failure. Based on a large amount of engineering geological survey data and analysis of slope rock mass characteristics of a certain opencast mine, the failure mechanism of high slope landslide in the north slope is studied in this paper, and the theory of saturated-unsaturated seepage flow and rainfall infiltration theory are used. The seepage field of expansive soft rock slope under the condition of rainfall infiltration is analyzed by SEEP/W numerical simulation software, and the stability of the slope is analyzed by combining the calculated transient seepage field results with the limit equilibrium method. The influence of different factors on stability is discussed. Finally, according to the slip deformation characteristics of north slope, the slope treatment measures are put forward briefly. Based on Darcy's law, the differential equation of saturated-unsaturated seepage and the conditions for calculating the definite solution of saturated-unsaturated seepage equation are analyzed in this paper. This is the basis of numerical simulation of rainfall infiltration by finite element method. By analyzing the engineering geological conditions and hydrogeological conditions of open pit coal mines, combined with the results of indoor mechanical tests and field tests of rock samples, The deformation characteristics and failure mechanism of slope are discussed. It is revealed that the deformation and failure of the expansive soft rock slope of the north slope follow the cyclic law of "dilatation and shrinkage cracking, water immersion softening and slip", and the finite element numerical simulation software is used to simulate the deformation and failure of the slope. The comparative analysis of rainfall seepage field under the condition of fissure and no consideration of fissure in seepage analysis shows that the influence of expansive soft rock fissure is not considered. After 3 days of heavy rain, the pore water pressure under rainfall is basically unaffected. Therefore, it is more reasonable to consider the influence of cracks on slope stability by rainfall seepage analysis of expansive soft rock slope of north slope. The seepage field of slope is analyzed by SEEP/W finite element analysis software, and the analysis results are combined with limit equilibrium method. The influence of rainfall intensity, rainfall duration and permeability coefficient on the stability of expansive soft rock slope is studied, and the influence law of rainfall intensity, rainfall duration and permeability coefficient on slope safety factor is obtained.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TD824.7

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