發(fā)布時間：2018-10-05 21:05

【摘要】：我國是世界上凍土分布面積的第三大國。隨著工程的建設(shè),將會面臨越來越多的寒區(qū)邊坡穩(wěn)定性問題。在我國,研究凍融循環(huán)對寒區(qū)邊坡穩(wěn)定性的影響具有十分現(xiàn)實而重要的意義。本文以黑龍江某露天銅礦巖質(zhì)邊坡穩(wěn)定性分析為依托,以理論研究和數(shù)值分析相結(jié)合的手段,展開對季節(jié)性凍土地區(qū)邊坡穩(wěn)定性評價的研究。借助巖土領(lǐng)域的有限差軟件FLAC3D進行應(yīng)力場、溫度場、水分場三場耦合,分析計算了黑龍江露天銅礦巖質(zhì)邊坡在凍融循環(huán)過程中的穩(wěn)定性變化。取得的主要成果與認識如下:1、在分析露天礦邊坡特征和水文地質(zhì)工程地質(zhì)條件的基礎(chǔ)上,提出了影響邊坡的穩(wěn)定性主要因素。利用極限平衡理論,使用Geostudio軟件在自然、降水等不同工況下對典型的邊破剖面進行穩(wěn)定性評價,并得出相應(yīng)的安全系數(shù);2、建立礦坑的三維數(shù)值模型,利用強度折減理論,通過使用Flac3D軟件對邊坡穩(wěn)定性作出評價,并將得出的結(jié)果和極限平衡理論的計算結(jié)果進行了對比分析;3、針對礦區(qū)的特點,模擬了凍融循環(huán)條件對邊坡穩(wěn)定性的影響。凍脹力的存在很大程度上影響了邊坡表層的應(yīng)力和變形,隨著季節(jié)性凍融循環(huán)的不斷進行,可能導(dǎo)致邊坡發(fā)生失穩(wěn)破壞。
[Abstract]:China is the third largest country in the world in the area of frozen soil distribution. With the construction of the project, there will be more and more problems of slope stability in cold region. In China, it is very important to study the influence of freeze-thaw cycle on slope stability in cold region. Based on the stability analysis of rock slope of an open pit copper mine in Heilongjiang province, this paper studies the evaluation of slope stability in seasonal frozen soil area by means of combining theoretical research with numerical analysis. With the help of the finite difference software FLAC3D in geotechnical field, the stress field, temperature field and water field are coupled. The stability changes of rock slope in Heilongjiang open-pit copper mine during freeze-thaw cycle are analyzed and calculated. The main achievements and understandings are as follows: 1. Based on the analysis of slope characteristics and hydrogeological engineering geological conditions of opencast mine, the main factors affecting slope stability are put forward. Using limit equilibrium theory and using Geostudio software to evaluate the stability of typical edge breaking section under different working conditions, such as nature and precipitation, the corresponding safety factor is obtained, and the three-dimensional numerical model of mine pit is established, and the strength reduction theory is used. By using Flac3D software to evaluate the slope stability, the results obtained are compared with the calculated results of the limit equilibrium theory. According to the characteristics of the mining area, the influence of freeze-thaw cycle conditions on the slope stability is simulated. The existence of frost heaving force affects the stress and deformation of slope surface to a great extent, and with the continuous seasonal freeze-thaw cycle, it may lead to the failure of slope stability.
【學位授予單位】：中國地質(zhì)大學(北京)
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P642.14

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本文編號：2254868