东露天槽仓黄土高边坡开挖支护变形分析
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摘要
文本针对东露天煤矿槽仓黄土高边坡,利用有限元方法,进行了边坡开挖前后变形规律的数值分析。黄土高边坡开挖后发生较大位移,针对未支护开挖条件下的边坡位移发展分布规律与应力集中区域的模拟结果,对重点支护部位进行动态设计防护。相比物理试验研究,数值试验具有许多优势,对数值模拟结果进行分析,拟在边坡坡面采用锚杆与土钉联合支护方法,在边坡直臂段采用钢内撑与护坡桩联合支护方法。模拟结果表明,该支护方案可以均衡应力分布,有效抑制水平位移的扩大,为边坡重点加固区域的动态设计施工提供了科学依据,达到了工程安全等级的设计要求。
The limit equilibrium method(FEM) is used to analyze the deformation rule of loess high slope at Dong Loutian coal mine before and after excavation.The larger displacement of the loess high slope will happen after excavation.The dynamic design method is used for the important protection location according to the displacement development rule and stress concentration region in numerical analysis.The slope surface is supported by anchors and soil nails.The straight arm segment of slope is supported by steel internal bracing and slope protection piles.The simulation results show that the stress field redistributes after excavation and reinforcement and the horizontal displacement of the slope is inhibited effectively.It provides the scientific basis for dynamic design and construction of the important reinforcement region of slope.The design project can be satisfied with the design requirements of engineering safety grade.
引文
[1]李志清,胡瑞林,林杜军,等.平朔东露天煤矿精煤槽仓高边坡稳定性评价研究报告[R].北京,2011,6.Li Zhiqing,Hu Ruilin,Lin Dujun,et al.Research Report ofStability Evaluation for High Slope of Coal Mine of Dong Lutian inShuozhou.Beijing,2011,6.
    [2]李志清,余文龙,范林峰,等.改良黄土强度特性与工程处置试验研究[J].工程地质学报,2011,19(1):116~121.Li Zhiqing,Yu Wenlong,Fan Linfeng,et al.Experimentalresearch on strength characteristics and engineering treatment ofmproved leoss soil.Journal of Engineering Geology,2011,19(1):116~121.
    [3]李四维,高华东,杨铁灯.深基坑开挖现场监测与数值模拟分析[J].岩土工程学报,2011,33(增1):284~291.Li Siwei,Gao Huadong,Yang Tiedeng.Monitoring and numericalanalysis of a deep foundation pit.Chinese Journal of GeotechnicalEngineering,2011,33(S1):284~291.
    [4]陆新政,宋二祥,吉林,等.某特深基坑考虑支护结构与土体共同作用的三维有限元分析[J].岩土工程学报,2003,25(4):488~491.Lu Xinzheng,Song Erxiang,Ji Lin,et al.3-Dimensional FEA forthe interaction between supporting structure of excavation and soilin a very deep pit.Chinese Journal of Geotechnical Engineering,2003,25(4):488~491.
    [5]刘开富,陈阶亮,谢新宇,等.基坑放坡开挖破坏性状大变形有限元分析[J].岩土工程学报,2006,28(增1):1406~1410.Liu Kaifu,Chen Jieliang,Xie Xinyu,et al.Large deformationfinite element analysis on excavated slopes.Chinese Journal ofGeotechnical Engineering,2006,28(S1):1406~1410.
    [6]宋广,黄建华,宋二祥.超前微桩复合土钉支护三维非线性数值分析[J].岩土工程学报,2010,32(增1):151~155.Song Guang,Huang Jianhua,Song Erxiang.Three-dimensionalnonlinear analysis of composite soil nailing with micro piles fordeep excavation.Chinese Journal of Geotechnical Engineering,2010,32(S1):151~155.
    [7]肖超,金福喜,刘海鸿,等.开挖与降雨作用下边坡失稳机理及模拟分析[J].工程地质学报,2012,20(1):37~43.Xiao Chao,Jin Fuxi,Liu Haihong,et al.Mechanism of slopefailure and numerical simulation analysis under slope excavationand rainfall infiltration.Journal of Engineering Geology,2012,20(1):37~43.
    [8]彭宁波,言志信,刘子振,等.地震作用下锚固边坡稳定性数值分析[J].工程地质学报,2012,20(1):44~50.Peng Ningbo,Yan Zhixin,Liu Zizhen,et al.Numerical analysison stability of slopes supported with bolts under earthquake.Journal of Engineering Geology,2012,20(1):44~50.
    [9]Zhang B Y,Wang J G,Shi R F.Time-dependent deformation inhigh concrete-faced rockfill dam and separation between concreteface slab and cushion layer[J].Computers and Geotechnics,2004,31(7):559~573.
    [10]Mansour Z,Chik Z,Taha M R.Predicting the geotechnicalperformance of Lisan Marl using finite element analysis,Dead Seaarea[J].Natural Hazards,2010,54:931~947.
    [11]Damiano E,Olivares L.The role of infiltration processes in steepslope stability of pyroclastic granular soils:Laboratory andnumerical investigation[J].Natural Hazards,2005,52:329~350.
    [12]Singh TN,Gulati A,Dontha L,Bhardwaj V.Evaluating cut slopefailure by numerical analysis-A case study[J].Natural Hazards,2008,47:263~279.

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