【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(huì)面臨越來越多的寒區(qū)邊坡穩(wěn)定性問題。在我國,研究?jī)鋈谘h(huán)對(duì)寒區(qū)邊坡穩(wěn)定性的影響具有十分現(xiàn)實(shí)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(duì)季節(jié)性凍土地區(qū)邊坡穩(wěn)定性評(píng)價(jià)的研究。借助巖土領(lǐng)域的有限差軟件FLAC3D進(jìn)行應(yīng)力場(chǎng)、溫度場(chǎng)、水分場(chǎng)三場(chǎng)耦合,分析計(jì)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(rèn)識(shí)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(duì)典型的邊破剖面進(jìn)行穩(wěn)定性評(píng)價(jià),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(qiáng)度折減理論,通過使用Flac3D軟件對(duì)邊坡穩(wěn)定性作出評(píng)價(jià),并將得出的結(jié)果和極限平衡理論的計(jì)算結(jié)果進(jìn)行了對(duì)比分析;3、針對(duì)礦區(qū)的特點(diǎn),模擬了凍融循環(huán)條件對(duì)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(jìn)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(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P642.14

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本文編號(hào)：2254868