震裂边坡稳定性极限分析
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摘要
地震导致山体大范围开裂松动,使岩体裂缝(隙)张开、扩展进而形成危险的震裂边坡。裂缝是控制震裂边坡变形破坏的切割边界和滑移边界,为此,考虑裂缝扩展、裂缝充水和地震影响,采用极限分析上限法对汶川地震震中附近的一实地震裂边坡的稳定性变化进行分析。计算结果揭示了随裂缝扩展延伸,在雨水、地震作用影响下震裂边坡稳定性变化规律,为类似边坡的分析评价与工程治理提供了理论依据。
Earthquake shocking inevitably bursts and shatters mountainous slopes.Because rock cracks(fractures) open and propagate influenced by earthquake,mountainous slope becomes the dangerous cracked slope.For such slope,the crack is the cutting and slip boundaries that control the slope failure.In this paper,limit analysis upper bound method is applied to analysize stability of specific cracked slope induced by Wenchuan earthquake in prospective of crack propagation,water inflow in crack and earthquake.The calculation reveals the variation of slope stability influenced by precipitation and earthquake in the process of crack propagation.This study provides a theoretical basis for evaluation and engineering protection of such cracked slopes.
Earthquake shocking inevitably bursts and shatters mountainous slopes.Because rock cracks(fractures) open and propagate influenced by earthquake,mountainous slope becomes the dangerous cracked slope.For such slope,the crack is the cutting and slip boundaries that control the slope failure.In this paper,limit analysis upper bound method is applied to analysize stability of specific cracked slope induced by Wenchuan earthquake in prospective of crack propagation,water inflow in crack and earthquake.The calculation reveals the variation of slope stability influenced by precipitation and earthquake in the process of crack propagation.This study provides a theoretical basis for evaluation and engineering protection of such cracked slopes.
引文
[1]许强.汶川大地震诱发地质灾害主要类型与特征研究[J].地质灾害与环境保护,2009,20(2):86-93.XU Qiang.Main types and characteristics of the geo-hazards triggered by the Wenchuan Earthquake[J].Journal of Geological Hazards and EnvironmentPreservation,2009,20(2):86-93.
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[6]吴永,何思明,李新坡,等.震后裂缝危岩体的失稳机理与诊断方法[J].四川大学学报(工程科学版),2010,42(5):185-190.WU Yong,HE Siming,LI Xinpo,et al.Failuremechanism and diagnosis method of dangerous crack rockafter earthquake[J].Journal of Sichuan University(Engineering Science Edition),2010,42(5):185-190.
[7]DONALD I,CHEN Z Y.Slope stability analysis by theupper bound approach:Fundamentals and methods[J].Canadian Geotechnical Journal,1997,34(6):853-862.
[8]王根龙,伍法权,祁生文,等.加锚岩质边坡稳定性评价的极限分析上限法研究[J].岩石力学与工程学报,2007,26(12):2556-2563.WANG Genlong,WU Faquan,QI Shengwen,et al.Research on limit analysis upper bound method forstability evaluation of anchored rock slope[J].ChineseJournal of Rock Mechanics and Engineering,2007,26(12):2556-2563.
[9]李新坡,何思明,徐骏,等.预应力锚索加固土质边坡的稳定性极限分析[J].四川大学学报(工程科学版),2006,38(5):82-85.LI Xinpo,HE Siming,XU Jun,et al.Stability analysisof slopes reinforced with pre-tensioned cables by limitanalysis method[J].Journal of Sichuan University(Engineering Science Edition),2006,38(5):82-85.
[10]舒继森,王兴中,周毅勇.岩石边坡中滑动面水压分布假设的改进[J].中国矿业大学学报,2004,33(5):509-512.SHU Jisen,WANG Xingzhong,ZHOU Yiyong.Improving on assumption for water pressure distributing onfailure surface in rock slope[J].Journal of ChinaUniversity of Mining&Technology,2004,33(5):509-512.
[2]冯文凯,许强,黄润秋.斜坡震裂变形力学机制初探[J].岩石力学与工程学报,2009,28(s):3124-3130.FENG Wenkai,XU Qiang,HUANG Runqiu.Preliminarystudy on mechanical mechanism of slope earthquake-induced deformation[J].Chinese Journal of RockMechanics and Engineering,2009,28(s):3124-3130.
[3]黄润秋,李为乐.“5.12”汶川大地震触发地质灾害的发育分布规律研究[J].岩石力学与工程学报,2008,27(12):2585-2592.HUANG Runqiu,LI Weile.Research on developmentand distribution rules of geohazards induced by WenchuanEarthquake on 12th May,2008[J].Chinese Journal ofRock Mechanics and Engineering,2008,27(12):2585-2592.
[4]解朝娣,朱元清,雷兴林,等.汶川8.0级地震的余震触发作用和对断层的应力加卸载作用[J].地震地磁观测与研究,2010,31(2):12-18.XIE Chaodi,ZHU Yuanqing,LEI Xinglin,et al.Earthquake triggering and stress loading/unloading effecton faults induced by the Ms 8.0 Wenchuan earthquake,Sichuan,China[J].Seismological and GeomagneticObservation and Research,2010,31(2):12-18.
[5]何思明,吴永,李新坡.地震诱发岩体崩塌的力学机制[J].岩石力学与工程学报,2010,29(s1):3359-3363.HE Siming,WU Yong,LI Xinpo.Collapse mechanism ofdanger rock triggered by earthquake[J].Chinese Journalof Rock Mechanics and Engineering,2010,29(s1):3359-3363.
[6]吴永,何思明,李新坡,等.震后裂缝危岩体的失稳机理与诊断方法[J].四川大学学报(工程科学版),2010,42(5):185-190.WU Yong,HE Siming,LI Xinpo,et al.Failuremechanism and diagnosis method of dangerous crack rockafter earthquake[J].Journal of Sichuan University(Engineering Science Edition),2010,42(5):185-190.
[7]DONALD I,CHEN Z Y.Slope stability analysis by theupper bound approach:Fundamentals and methods[J].Canadian Geotechnical Journal,1997,34(6):853-862.
[8]王根龙,伍法权,祁生文,等.加锚岩质边坡稳定性评价的极限分析上限法研究[J].岩石力学与工程学报,2007,26(12):2556-2563.WANG Genlong,WU Faquan,QI Shengwen,et al.Research on limit analysis upper bound method forstability evaluation of anchored rock slope[J].ChineseJournal of Rock Mechanics and Engineering,2007,26(12):2556-2563.
[9]李新坡,何思明,徐骏,等.预应力锚索加固土质边坡的稳定性极限分析[J].四川大学学报(工程科学版),2006,38(5):82-85.LI Xinpo,HE Siming,XU Jun,et al.Stability analysisof slopes reinforced with pre-tensioned cables by limitanalysis method[J].Journal of Sichuan University(Engineering Science Edition),2006,38(5):82-85.
[10]舒继森,王兴中,周毅勇.岩石边坡中滑动面水压分布假设的改进[J].中国矿业大学学报,2004,33(5):509-512.SHU Jisen,WANG Xingzhong,ZHOU Yiyong.Improving on assumption for water pressure distributing onfailure surface in rock slope[J].Journal of ChinaUniversity of Mining&Technology,2004,33(5):509-512.
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