地震作用下预应力锚索对岩石边坡稳定性影响的模拟方法及锚索优化研究
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摘要
以西部某水电岩石高边坡为背景,采用杆单元和杆单元节点集中力的方法模拟边坡自由式预应力锚索,通过有限元模拟和拟静力法分析相结合的分析方法,由有限元软件计算在地震作用下的锚索内力分布、边坡位移,并通过自编后处理程序计算出最不利结构面组合下的边坡整体稳定性安全系数。在此基础上,研究预应力锚索的锚固角度、预应力大小、锚固深度、锚索排间距与结构面之间的空间关系对地震作用下边坡变形和整体稳定性的影响规律,并以此为依据提出预应力锚索优化设计方法。
The seismic analysis of slope stability is carried out by combining the finite element method and the pseudo-static method.The slope anchor is modeled by the link element and the prestress state is modeled by applying nodal forces to the element.The method is employed to analyze a high rock slope in the western region of China.The distribution of the internal force of the prestressed anchors and the slope displacement are obtained.The safety factor along the critical joint plane is calculated by using an in-house code.The influences of the relation among the anchorage angle,anchorage length,spacing of anchors and structural plane of the slope on the displacement and stability of the slope under earthquakes are also studied.Based on the above research,the optimal prestressed anchor scheme is proposed and verified by 2D and 3D tests.
The seismic analysis of slope stability is carried out by combining the finite element method and the pseudo-static method.The slope anchor is modeled by the link element and the prestress state is modeled by applying nodal forces to the element.The method is employed to analyze a high rock slope in the western region of China.The distribution of the internal force of the prestressed anchors and the slope displacement are obtained.The safety factor along the critical joint plane is calculated by using an in-house code.The influences of the relation among the anchorage angle,anchorage length,spacing of anchors and structural plane of the slope on the displacement and stability of the slope under earthquakes are also studied.Based on the above research,the optimal prestressed anchor scheme is proposed and verified by 2D and 3D tests.
引文
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[2]李宁,张平,李国玉.岩质边坡预应力锚固的设计原则与方法探讨[J].岩石力学与工程学报,2004,23(17):2972-2976.(LI Ning,ZHANG Ping,LI Guo-yu.Discussionon design principle and method of prestressed cable forsupport of rock slopes[J].Chinese Journal of RockMechanics and Engineering,2004,23(17):2972-2976.(inChinese))
[3]祝介旺,刘建友,伍法权,等.锦屏一级水电站左岸深部卸荷裂隙的加固方案及数值模拟研究[J].岩石力学与工程学报,2007,26(12):2541-2548.(ZHU Jie-wang,LIU Jian-you,WU Fa-quan,et al.Study on reinf orcement technology ofdeep unloaded fissures in left bank of Jinping first stagehydropower station and its numerical simulation[J].ChineseJournal of Rock Mechanics and Engineering,2007,26(12):2541-2548.(in Chinese))
[4]刘杰,李建林,张玉灯,等.基于拟静力法的大岗山坝肩边坡地震工况稳定性分析[J].岩石力学与工程学报,2009,28(8):1562-1570.(LIU Jie,LI Jian-lin,ZHANG Yu-deng,et al.Stability analysis of dagangshan dam abutment slopeunder earthquake based on pseudo-static method[J].ChineseJournal of Rock Mechanics and Engineering,2009,28(8):1562-1570.(in Chinese))
[5]罗强,李亮,赵炼恒.水力和超载条件下锚固岩石边坡动态稳定性拟静力分析[J].岩土力学,2010,31(11):3585-3593.(LUO Qiang,LI Liang,ZHAO Lian-heng.Quasi-static analysis of seismic stability of anchored rockslope under surcharge and water pressure conditions[J].Rockand Soil Mechanics,2010,31(11):3585-3593.(in Chinese))
[6]汪鹏程,朱大勇,许强.强震作用下加固边坡的动力响应及不同加固方式的比较研究[J].合肥工业大学学报(自然科学版),2009,32(10):1501-1504.(WANG Peng-cheng,ZHU Da-yong,XU Qiang.Dynamic response of slopessubjected to intense earthquakes and effect comparisonbetween various support modes[J].Journal of HefeiUniversity of Technology(Natural Science),2009,32(10):1501-1504.(in Chinese))
[7]王泰恒,许文年,陈池,等.预应力锚固技术基本理论与实践[M].北京:中国水利水电出版社,2007.(WANGTai-heng,XU Wen-nian,CHEN Chi,et al.Basic theory andpractice of prestressed anchoring technology[M].Beijing:China Water Power Press,2007.(in Chinese))
[8]李宁,张鹏,于冲.边坡预应力锚索加固的数值模拟方法研究[J].岩石力学与工程学报,2007,26(2):254-261.(LI Ning,ZHANG Peng,YU Chong.Research onmethod of numerical simulation of prestressed anchor cablein slope[J].Chinese Journal of Rock Mechanics andEngineering,2007,26(2):254-261.(in Chinese))
[9]陈祖煜.土质边坡稳定分析-原理方法程序[M].北京:中国水利水电出版社,2003.(CHEN Zu-yu.Stabilityanalysis of soil slopes-theory,methods and programs[M].Beijing:China Water Power Press,2003.(in Chinese))
[10]庄晓莹,蔡永昌,朱合华.锚固边坡稳定性分析有限元模型及锚固效应的探讨[J].岩土工程学报,2008,30(7):1099-1104.(ZHUANG Xiao-ying,CAI Yong-chang,ZHUHe-hua.FEM modeling method for anchored slope stabilityanalysis and discussions on anchoring effect[J].ChineseJournal of Geotechnical Engineering,2008,30(7):1099-1104.(in Chinese))
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