冻融循环作用对边坡稳定性的影响
发布时间：2018-10-05 21:05
【摘要】：我国是世界上冻土分布面积的第三大国。随着工程的建设,将会面临越来越多的寒区边坡稳定性问题。在我国,研究冻融循环对寒区边坡稳定性的影响具有十分现实而重要的意义。本文以黑龙江某露天铜矿岩质边坡稳定性分析为依托,以理论研究和数值分析相结合的手段,展开对季节性冻土地区边坡稳定性评价的研究。借助岩土领域的有限差软件FLAC3D进行应力场、温度场、水分场三场耦合,分析计算了黑龙江露天铜矿岩质边坡在冻融循环过程中的稳定性变化。取得的主要成果与认识如下:1、在分析露天矿边坡特征和水文地质工程地质条件的基础上,提出了影响边坡的稳定性主要因素。利用极限平衡理论,使用Geostudio软件在自然、降水等不同工况下对典型的边破剖面进行稳定性评价,并得出相应的安全系数;2、建立矿坑的三维数值模型,利用强度折减理论,通过使用Flac3D软件对边坡稳定性作出评价,并将得出的结果和极限平衡理论的计算结果进行了对比分析;3、针对矿区的特点,模拟了冻融循环条件对边坡稳定性的影响。冻胀力的存在很大程度上影响了边坡表层的应力和变形,随着季节性冻融循环的不断进行,可能导致边坡发生失稳破坏。
[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.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P642.14
本文编号：2254868
[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.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P642.14
【参考文献】
相关期刊论文 前3条
1 张水生;;安家岭矿9000工作面露天边坡稳定性分析[J];矿山测量;2008年03期
2 赵奎;杨欣;王德中;;露天边坡开挖稳定性的数值模拟研究[J];现代矿业;2011年01期
3 史明;李清洋;李刚;;高速公路边坡稳定性的FLAC 3D数值模拟分析[J];市政技术;2012年06期
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