Analysis on the slope stability of Fushun West Open-pit Mine under superimposed action of rainfall, mine and earthquake
-
摘要:
夏季抚顺降雨频发且持续时间长，若遇上矿震，边坡极易失稳破坏。为分析雨季矿震作用对抚顺西露天矿的影响，采用极限平衡法整合渗流场，分析边坡稳定性。结果表明：相同雨强，持续时间越长，孔隙水压力等值线越密集，等值线闭合区域越多，边坡的安全系数越低；相同持时，雨强越大，孔隙水压力等值线图变化越快；降雨量相同，雨强越小雨水入渗影响的范围越大；加入水平矿震荷载系数后，随着矿震烈度增加，边坡安全系数降低。边坡降雨存在一个降雨临界值，降雨量未到达临界值时，边坡的安全系数下降缓慢，当到达临界值后，安全系数迅速下降。降雨和矿震对边坡安全影响极大，应当提前对边坡进行加固。
Abstract:In summer, the rainfall in Fushun occurs frequently and lasts for a long time. If there is a mine earthquake, the slope is very easy to be unstable and destroyed. The limit equilibrium method combined with the seepage field is used to analyze the slope stability, so that we can analyze the impact of mine earthquakes in the rainy season on the Fushun West Open-pit Mine.The results show that with the same rainfall intensity and the longer duration, the pore water pressure contour is denser, and the more closed areas of the contour are, the lower the safety factor of the slope is. At the same duration, the greater the rainfall intensity, the faster the pore water pressure contour map changes; Rainfall is the same, the smaller the rainfall intensity, the greater the range of rainfall infiltration; After adding the horizontal mine earthquake load factor, as the mine earthquake intensity increases, the slope safety factor decreases. There is a rainfall critical value for slope rainfall. When the rainfall does not reach the critical value, the safety factor of the slope decreases slowly, and when it reaches the critical value, the safety factor decreases rapidly. Rainfall and mine earthquake have a great impact on the safety of the slope, so the slope should be reinforced in advance.
-
Key words:
- mine earthquake /
- rainfall /
- pore water pressure /
- load factor /
- safety factor
-
-
表 1 岩层的基本物理参数
Table 1. Basic physical parameters of rock formation
岩层 杂填土 凝灰岩 玄武岩 渗透系数k/（m∙h−1） 10−2 5×10−3 8×10−7 黏聚力c/MPa 0.1 0.15 0.14 内摩擦角φ/（°） 20 39 42 密度ρ/（kg·m−3） 2000 2600 2800 
下载: 导出CSV
表 3 水平矿震系数
Table 3. Horizontal mine seismic coefficient
矿震烈度 无 Ⅵ度 Ⅶ度 Ⅷ度 Ⅸ度 峰值加速度g 0 0.05 0.1 0.2 0.4 荷载系数 0 6.25×10−4 2.5×10−3 0.01 0.04
下载: 导出CSV
表 5 A型雨强不同矿震载荷作用边坡安全系数
Table 5. Safety factors of slopes under different mine seismic loads of Type A rain intensities
工况 0 h 边坡稳定性状态 24 h 边坡稳定性状态 无 1.046 欠稳定 1.028 欠稳定 Ⅵ度 1.045 欠稳定 1.027 欠稳定 Ⅶ度 1.041 欠稳定 1.023 欠稳定 Ⅷ度 1.022 欠稳定 1.006 欠稳定 Ⅸ度 0.957 不稳定 0.943 不稳定
下载: 导出CSV
-
[1] 杨攀, 杨军. 考虑前期降雨的边坡稳定降雨阈值曲面[J]. 岩土力学,2015,36(增刊1):169 − 174. [YANG Pan, YANG Jun. Rainfall threshold surface for slopes stability considering antecedent rainfall[J]. Rock and Soil Mechanics,2015,36(Sup1):169 − 174. (in Chinese with English abstract)
[2] 王一兆, 隋耀华. 降雨入渗对边坡浅层稳定性的影响[J]. 长江科学院院报,2017,34(4):122 − 125. [WANG Yizhao, SUI Yaohua. Influence of rainfall infiltration on slope stability at shallow layer[J]. Journal of Yangtze River Scientific Research Institute,2017,34(4):122 − 125. (in Chinese with English abstract)
[3] 周秀艳, 付建飞. 抚顺西露天矿区地下水水化学及演变特征[J]. 露天采矿技术,2020,35(2):6 − 10. [ZHOU Xiuyan, FU Jianfei. Hydrochemistry and evolution characteristics of groundwater in Fushun West Open-pit Mine[J]. Opencast Mining Technology,2020,35(2):6 − 10. (in Chinese with English abstract)
[4] 赵广信, 常耀广, 李兰. 抚顺煤田极值矿震影响范围预测[J]. 中国地质灾害与防治学报,2006,17(3):80 − 83. [ZHAO Guangxin, CHANG Yaoguang, LI Lan. Prediction of the scope influenced by the mining caused earthquake in Fushun coalfield[J]. The Chinese Journal of Geological Hazard and Control,2006,17(3):80 − 83. (in Chinese with English abstract) doi: 10.3969/j.issn.1003-8035.2006.03.019
[5] 侯龙. 非饱和土孔隙水作用机理及其在边坡稳定分析中的应用研究[D]. 重庆: 重庆大学, 2012.
HOU Long. Research on the mechanism of pore water action within unsaturated soil and the corresponding slope stability[D]. Chongqing: Chongqing University, 2012. (in Chinese with English abstract)
[6] 孙必雄. 降雨入渗下非饱和土填方路基的渗流特性与稳定性研究[D]. 广州: 华南理工大学, 2015.
SUN Bixiong. The research on seepage characteristic and stability of the unsaturated soil fill subgrade under the condition of rainfall infiltration[D]. Guangzhou: South China University of Technology, 2015. (in Chinese with English abstract)
[7] 海龙, 梁冰. 考虑降雨入渗条件的土体边坡稳定性分析[J]. 水资源与水工程学报,2010,21(4):46 − 50. [HAI Long, LIANG Bing. Analysis of land slope stability cnsidering rainfall infiltration[J]. Journal of Water Resources and Water Engineering,2010,21(4):46 − 50. (in Chinese with English abstract)
[8] 刘卫涛, 曹文贵, 张运强. 考虑土体非饱和特性的斜坡降雨入渗模型及边坡稳定性分析[J]. 长江科学院院报,2021,38(4):102 − 109. [LIU Weitao, CAO Wengui, ZHANG Yunqiang. Rainfall infiltration model and slope stability analysis in consideration of unsaturated soil characteristics[J]. Journal of Yangtze River Scientific Research Institute,2021,38(4):102 − 109. (in Chinese with English abstract)
[9] 杨世豪, 苏立君, 张崇磊, 等. 强降雨作用下昔格达边坡渗流特性及稳定性分析[J]. 土木与环境工程学报(中英文),2020,42(4):19 − 27. [YANG Shihao, SU Lijun, ZHANG Chonglei, et al. Analysis of seepage characteristics and stability of Xigeda formation slope under heavy rainfall[J]. Journal of Civil and Environmental Engineering,2020,42(4):19 − 27. (in Chinese with English abstract)
[10] 向章波, 张家铭, 周晓宇, 等. 基于Slide的某红层路堑边坡稳定性分析[J]. 水文地质工程地质,2015,42(4):90 − 95. [XIANG Zhangbo, ZHANG Jiaming, ZHOU Xiaoyu, et al. The slope stability analysis of red bed based on slide[J]. Hydrogeology & Engineering Geology,2015,42(4):90 − 95. (in Chinese with English abstract)
[11] 徐翔, 王义兴, 方正. 降雨和库水联合作用下边坡稳定性变化规律[J]. 中国地质灾害与防治学报,2019,30(2):51 − 58. [XU Xiang, WANG Yixing, FANG Zheng. Analysis on stability of a slope under rainfall and reservoir water level variation[J]. The Chinese Journal of Geological Hazard and Control,2019,30(2):51 − 58. (in Chinese with English abstract)
[12] 中华人民共和国国家质量监督检验检疫总局, 中国国家标准化管理委员会. 中国地震烈度表: GB/T 17742—2008[S]. 北京: 中国标准出版社, 2009.
General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China, Standardization Administration of the People’s Republic of China. The Chinese seismic intensity scale: GB/T 17742—2008[S]. Beijing: Standards Press of China, 2009. (in Chinese)
[13] 中华人民共和国住房和城乡建设部. 建筑边坡工程技术规范: GB 50330—2013[S]. 北京: 中国建筑工业出版社, 2014.
Ministry of Housing and Urban-Rural Development of the People's Republic of China. Technical code for building slope engineering: GB 50330—2013[S]. Beijing: China Architecture & Building Press, 2014. (in Chinese)
-
图(9)
表(5)
计量
- 文章访问数: 1519
- PDF下载数: 229
- 施引文献: 0