粤赣高速公路某岩质边坡稳定性分析与加固研究
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摘要
采用双平面滑动刚体极限平衡法计算边坡稳定性分析模型,考虑了水压力、地震动荷载的作用并进行加固研究,探讨了结构面力学参数敏感性分析。结果表明,水压力是边坡破坏最重要的影响因素,地震动荷载对边坡稳态的作用是比较显著的;应当将总锚固力的标准值提高到2920 kN,才能满足边坡稳定的要求;锚固角为25°时,锚固效果较好又相对经济;结构面力学参数1φ对边坡稳定性没有影响,参数c1、c2和2φ增大有利于边坡稳定,这三个参数的影响程度从小到大依次增强,但是总的来说影响并不大。本文研究方法和成果可以为改善工程施工提供依据。
A model based on limit equilibrium analysis of rigid body with double sliding plane for calculating rock slope stability is proposed in the paper.The influences of hydraulic pressure and earthquake load are considered.The anchorage research is carried out.The sensitivity analysis of mechanical parameters of structural plane is analyzed.It is shown that the hydraulic pressure is the most important effect to the failure of slope and the effect of earthquake load is also remarkable.The rock slope is safe on condition that the total anchoring force is enhanced to 2 920 kN.Moreover,both anchorage effect and economic benefits are achieved when the anchoring angle is 25°.The parameter φ1is independent of the slope stability,but the parameters of c1、c2and φ2which are improved are helpful and in a increasing order.However,the influence grade is small.The obtained results can offer criteria to improve the practicial construction of engineering.
A model based on limit equilibrium analysis of rigid body with double sliding plane for calculating rock slope stability is proposed in the paper.The influences of hydraulic pressure and earthquake load are considered.The anchorage research is carried out.The sensitivity analysis of mechanical parameters of structural plane is analyzed.It is shown that the hydraulic pressure is the most important effect to the failure of slope and the effect of earthquake load is also remarkable.The rock slope is safe on condition that the total anchoring force is enhanced to 2 920 kN.Moreover,both anchorage effect and economic benefits are achieved when the anchoring angle is 25°.The parameter φ1is independent of the slope stability,but the parameters of c1、c2and φ2which are improved are helpful and in a increasing order.However,the influence grade is small.The obtained results can offer criteria to improve the practicial construction of engineering.
引文
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[2]徐志英.岩石力学(第三版)[M].北京:中国水利水电出版社,1993.Xu Z Y.Rock Mechanics(Third Edition)[M].Beijing:China Water Power Press,1993.
[3]肖树芳,杨淑碧.岩体力学[M].北京:地质出版社,1986.Xiao S F,Yang S B.Rock Mass Mechanics[M].Beijing:Geological Publishing House,1986.
[4]河海大学岩土工程研究所.粤赣高速公路重点岩质高边坡稳定性分析研究报告[R].南京:河海大学岩土工程研究所,2004.Geotechnical Research Institute,Hohai University.The research report of important rock slope stabilityanalysis of Yuegan highway[R].Nanjing:Geotechnical Research Institute,Hohai University,2004.
[5]JTJ 004-89,公路工程抗震设计规范[S].
[6]GB 50330—2002,建筑边坡工程技术规范[S].
[7]张发明,陈祖煜,刘宁,等.确定预应力锚索设计参数的优化方法[J].地下空间,2001,21(4):305-310.Zhang F M,Chen Z Y,Liu N,et al.Optimization fordetermination of parameters for prestressed cabledesign[J].Underground Space,2001,21(4):305-310.
[8]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 N,Zhang P,Li G Y.Discussion on designprinciple and method of prestressed cable for supportof rock slopes[J].Chinese Journal of Rock Mechanicsand Engineering,2004,23(17):2972-2976.
[9]侯哲生,李晓,王思敬,等.金川二矿某巷道围岩力学参数对变形的敏感性分析[J].岩石力学与工程学报,2005,24(3):406-410.Hou Z S,Li X,Wang S J,et al.Sensitivity analysisof mechanical parameters to deformation ofsurrounding rocks for a tunnel in Jinchuan Deposit[J].Chinese Journal of Rock Mechanics andEngineering,2005,24(3):406-410.
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