基于空间效应的弃渣场边坡稳定性方法探讨
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摘要
弃渣场常见于基础设施的建设过程中,影响其边坡稳定的因素众多,其中坡面凹凸形态、滑体端部效应以及坡体走向等空间效应因素对边坡稳定性的影响尤为显著.为了研究坡体走向对边坡稳定性的影响,针对走向为折线形(弃渣场上下区域走向存在夹角)的某核电厂弃渣场,探讨了其边坡稳定性分析方法.通过现场地质调查和区域划分,借助ANSYS建立三维模型,利用FLAC~(3D)强度折减法分析稳定性和潜在破坏机制,以此研究弃渣场走向夹角对其潜在破坏机制的影响,最后提出考虑走向夹角因素的不平衡推力法,并展开走向夹角和边坡倾角对弃渣场边坡稳定性影响的分析.研究结果表明:走向夹角影响弃渣场边坡应力场的分布形式和力的传递能力,走向夹角越大其稳定性越好,走向夹角超过60°时边坡安全系数明显提高;坡顶区域倾角越大,坡脚区域倾角越小时,其安全系数提升幅度随走向夹角的增大而显著提高.研究成果可为类似折线形走向边坡的稳定性分析和治理设计提供参考.
An abandoned dreg site is a common occurrence in construction projects. There are numerous factors that influence the slope stability including the spatial effect of the concave and convex form,and side-body-end and slope strike,which play vital roles in slope stability analysis. In order to investigate the effect of slope strike on slope stability, an abandoned dreg site in a Nuclear Power Plant was considered, of which the strike is a broken line(i.e.,an angle of strike exists between the upper region and the lower region) to discuss the method of slope stability analysis. The effect of the angle of strike was then studied for potential failure mechanism of the abandoned dreg site via geotechnical field investigation and region division using a 3D-model that was constructed using ANSYS,and an analysis of the slope stability by the strength reduction method in FLAC~(3D) was conducted. Finally,the imbalance thrust force method was proposed,taking into consideration the angle of strike.An analysis of the effect of the angle of strike and the dip of slope for stability was then performed. The results indicate that the angle of strike has an effect on the distribution of the stress field and the capability for force transmission. Hence,slope stability will be improved with an increase of the strike angle,and safety factors will increase significantly when the strike angle is more than 60°. In addition,there is a significant increase in safety factors with an increase in the angle of strike,while the dip of the slope crest increases and the dip of slope toe decreases. The results provide a scientific reference to evaluate the stability and design treatment for slopes,where the strike is a broken line.
An abandoned dreg site is a common occurrence in construction projects. There are numerous factors that influence the slope stability including the spatial effect of the concave and convex form,and side-body-end and slope strike,which play vital roles in slope stability analysis. In order to investigate the effect of slope strike on slope stability, an abandoned dreg site in a Nuclear Power Plant was considered, of which the strike is a broken line(i.e.,an angle of strike exists between the upper region and the lower region) to discuss the method of slope stability analysis. The effect of the angle of strike was then studied for potential failure mechanism of the abandoned dreg site via geotechnical field investigation and region division using a 3D-model that was constructed using ANSYS,and an analysis of the slope stability by the strength reduction method in FLAC~(3D) was conducted. Finally,the imbalance thrust force method was proposed,taking into consideration the angle of strike.An analysis of the effect of the angle of strike and the dip of slope for stability was then performed. The results indicate that the angle of strike has an effect on the distribution of the stress field and the capability for force transmission. Hence,slope stability will be improved with an increase of the strike angle,and safety factors will increase significantly when the strike angle is more than 60°. In addition,there is a significant increase in safety factors with an increase in the angle of strike,while the dip of the slope crest increases and the dip of slope toe decreases. The results provide a scientific reference to evaluate the stability and design treatment for slopes,where the strike is a broken line.
引文
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[13]郑文棠,徐卫亚,童富果,等.复杂边坡三维地质可视化和数值模型构建[J].岩石力学与工程学报,2007,26(8):1633-1644.ZHENG Wentang,XU Weiya,TONG Fuguo,et al.3D geological visualization and numerical modeling of complicated slope[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(8):1633-1644.
[14]崔芳鹏,胡瑞林,刘照连,等.基于Surfer平台的FLAC3D复杂三维地质建模研究[J].工程地质学报,2008,16(5):699-702.CUI Fangpeng,HU Ruilin,LIU Zhaolian,et al.Surfer software platform based complex threedimensional geological digital models for preprocessing of FLAC3D[J].Journal of Engineering Geology,2008,16(5):699-702.
[15]郑颖人,陈祖煜,王恭先,等.边坡与滑坡工程治理[M].北京:人民交通出版社,2010:105-106.
[2]徐永年,田卫宾.开发建设项目弃渣场设计及防洪问题[J].中国水土保持,2003,35(10):23-25.XU Yongnian,TIAN Weibin.Issues on the design of dumping sites and flood control of development and construction projects[J].Soil and Water Conservation in China,2003,35(10):23-25.
[3]刘建伟,史东梅,马晓刚,等.弃渣场边坡稳定性特征分析[J].水土保持学报,2007,21(5):192-195.LIU Jianwei,SHI Dongmei,MA Xiaogang,et al.Stability characteristics analysis on side slops of excavation waste dump[J].Journal of Soil and Water Conservation,2007,21(5):192-195.
[4]刘浩,张家铭,付金丹,等.弃渣场滑坡影响因素敏感性计算分析[J].安全与环境工程,2012,19(6):55-58.LIU Hao,ZHANG Jiaming,FU Jindan,et al.Sensitivity analysis of influencing factors of discarded soil field landslide[J].Safety and Environmental Engineering,2012,19(6):55-58.
[5]朱乃龙,张世雄.深凹露天矿边坡稳定的空间受力状态分析[J].岩石力学与工程学报,2003,22(5):810-812.ZHU Nailong,ZHANG Shixiong.Mechanical analysis of the stability of deep furrow pit slope[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(5):810-812.
[6]汪海滨,李小春,米子军,等.排土场空间效应及其稳定性评价方法研究[J].岩石力学与工程学报,2011,30(10):2103-2111.WANG Haibin,LI Xiaochun,MI Zijun,et al.Researches on space effect of waste dumps and its stability evaluation method[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(10):2103-2111.
[7]卢坤林,朱大勇.坡面形态对边坡稳定性影响的理论与试验研究[J].岩石力学与工程学报,2014,33(1):35-42.LU Kunlin,ZHU Dayong.Theoretical and experimental study of effect of slope topography on its stability[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(1):35-42.
[8]RASSAM D W,WILLIAMS D J.Three-dimensional effects on slope stability of high waste rock dumps[J].International Journal of Surface Mining,Reclamation and Environment,1988,13(1):19-24.
[9]卢坤林,朱大勇,杨扬.二维与三维边坡稳定性分析结果的比较与分析[J].岩土力学,2012,33(增刊2):150-155.LU Kunlin,ZHU Dayong,YANG Yang.Comparison and analysis of 2D and 3D slope stability analysis results[J].Rock and Soil Mechanics,2012,33(S2):150-155.
[10]中华人民共和国专业标准编写组.工程岩体分级标准:GB/T 50218-2014[S].北京:中国计划出版社,2014.
[11]陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2008:288-300.
[12]李跃,杨永生,毛权生,等.基于三维地质模型的排土场边坡整体稳定性探究[J].岩土力学,2013,34(增刊1):533-539.LI Yue,YANG Yongsheng,MAO Quansheng,et al.Researches on general stability for dump slope based on three-dimensional geologic model[J].Rock and Soil Mechanics,2013,34(S1):533-539.
[13]郑文棠,徐卫亚,童富果,等.复杂边坡三维地质可视化和数值模型构建[J].岩石力学与工程学报,2007,26(8):1633-1644.ZHENG Wentang,XU Weiya,TONG Fuguo,et al.3D geological visualization and numerical modeling of complicated slope[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(8):1633-1644.
[14]崔芳鹏,胡瑞林,刘照连,等.基于Surfer平台的FLAC3D复杂三维地质建模研究[J].工程地质学报,2008,16(5):699-702.CUI Fangpeng,HU Ruilin,LIU Zhaolian,et al.Surfer software platform based complex threedimensional geological digital models for preprocessing of FLAC3D[J].Journal of Engineering Geology,2008,16(5):699-702.
[15]郑颖人,陈祖煜,王恭先,等.边坡与滑坡工程治理[M].北京:人民交通出版社,2010:105-106.
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