岩质高边坡动力稳定性评价方法与应用
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摘要
以上海地区天马山采石深坑岩质高边坡为研究对象,围绕岩质高边坡工程中的动力抗滑稳定性问题,通过室内试验和现场试验,对影响岩质高边坡稳定性的地质构造、场地工程条件等内在因素进行分析.采用有限元动力分析法对高边坡在地震载荷作用下的动力响应特性进行分析,探讨地震荷载作用下,影响岩质高边坡稳定性的因素、地震荷载与岩质高边坡失稳破坏之间的关系,并采用动力有限元法与强度折减法相结合的方法进行动力抗滑稳定性研究.结果表明:地震荷载作用下的水平推力对深坑酒店的稳定性影响很大,边坡顶部岩体存在向坑内整体倾覆的危险;边坡动力失稳及动力安全系数的确立可采用位移突变的方法.
A high rock slope,which is beside a stone-pit at the foot of Tianma hill in Shanghai,is taken as the research object.Surrounding the issue of dynamic stability of high rock slope in engineering and according to the results of laboratory and field tests,the interior factors influencing the stability of high rock slope were discussed,such as geological structure and site condition.Based on this,dynamic finite element method(FEM) analysis for the response of high rock slope under the earthquake will help to confirm the relationship between seismic load and the stability for slope.Combining dynamic FEM with shear strength reduction the dynamic integrity stability for the slope was studied.The results show that the horizontal thrust created by seismic load has significant impact on the stability for slope,which will make rock mass on the top be in danger of toppling into the pit.Meanwhile,the global safety factor and dynamic instability of the slope can be established by mutational displacement method.
A high rock slope,which is beside a stone-pit at the foot of Tianma hill in Shanghai,is taken as the research object.Surrounding the issue of dynamic stability of high rock slope in engineering and according to the results of laboratory and field tests,the interior factors influencing the stability of high rock slope were discussed,such as geological structure and site condition.Based on this,dynamic finite element method(FEM) analysis for the response of high rock slope under the earthquake will help to confirm the relationship between seismic load and the stability for slope.Combining dynamic FEM with shear strength reduction the dynamic integrity stability for the slope was studied.The results show that the horizontal thrust created by seismic load has significant impact on the stability for slope,which will make rock mass on the top be in danger of toppling into the pit.Meanwhile,the global safety factor and dynamic instability of the slope can be established by mutational displacement method.
引文
[1]史丹,陈蕴生,韩信,等.岩质边坡地震动力稳定性研究进展[J].西北农林科技大学学报:自然科学版,2006,34(2):147-152.SHI Dan,CHEN Yun-sheng,HAN Xin,et al.Theevaluation of seismic dynamic stability of rock slope[J].Journal of Northwest Sci-Tech University of Agri-culture and Forestry:Natural Science Edition,2006,34(2):147-152.
[2]Seed H B,Martin G R.The seismic coefficient inearth dam design[J].Journal of Soil Mechanics andFound,Division,1966,92(3):25-58.
[3]Kramer S,Smith D.Modified Newmark model forseismic displacement of compliant slopes[J].Journalof Geotechnical and Geoenvironmental Engineering,1997,123(7):635-644.
[4]唐洪祥,邵龙潭.地震动力作用下有限元土石坝边坡稳定性分析[J].岩石力学与工程学报,2004,23(8):1318-1324.TANG Hong-xiang,SHAO Long-tan.Finite elementanalysis on slope stability of earth-rock dam underearthquake[J].Journal of Rock Mechanics and Engi-neering,2004,23(8):1318-1324.
[5]刘天鹏,赵立旺,郝长生,等.汶川地震对江口电站进水口边坡稳定性影响分析[J].水电自动化与大坝监测,2010,34(4):55-57.LIU Tian-peng,ZHAO Li-wang,HAO Chang-sheng,et al.Influences of Wenchuan earthquake on stabilityof water-intake slope of Jiangkou hydropower station[J].Hydropower Automation and Dam Monitoring,2010,34(4):55-57.
[6]GB 50218-94,工程岩体分级标准[S].
[7]吕庆,孙红月,尚岳全.强度折减有限元法中边坡失稳判据的研究[J].浙江大学学报:工学版,2008,42(1):83-87.L Qing,SUN Hong-yue,SHANG Yue-quan.Slopefailure criteria of shear strength reduction finiteelement method[J].Journal of Zhejiang University:Engineering Science,2008,42(1):83-87.
[8]杨永兵.边坡岩石强度与岩体强度的工程变换[J].金属矿山,2004(9):10-12.YANG Yong-bing.Engineering conversion of strengthbetween slope rock and rock mass[J].Metal Mine,2004(9):10-12.
[2]Seed H B,Martin G R.The seismic coefficient inearth dam design[J].Journal of Soil Mechanics andFound,Division,1966,92(3):25-58.
[3]Kramer S,Smith D.Modified Newmark model forseismic displacement of compliant slopes[J].Journalof Geotechnical and Geoenvironmental Engineering,1997,123(7):635-644.
[4]唐洪祥,邵龙潭.地震动力作用下有限元土石坝边坡稳定性分析[J].岩石力学与工程学报,2004,23(8):1318-1324.TANG Hong-xiang,SHAO Long-tan.Finite elementanalysis on slope stability of earth-rock dam underearthquake[J].Journal of Rock Mechanics and Engi-neering,2004,23(8):1318-1324.
[5]刘天鹏,赵立旺,郝长生,等.汶川地震对江口电站进水口边坡稳定性影响分析[J].水电自动化与大坝监测,2010,34(4):55-57.LIU Tian-peng,ZHAO Li-wang,HAO Chang-sheng,et al.Influences of Wenchuan earthquake on stabilityof water-intake slope of Jiangkou hydropower station[J].Hydropower Automation and Dam Monitoring,2010,34(4):55-57.
[6]GB 50218-94,工程岩体分级标准[S].
[7]吕庆,孙红月,尚岳全.强度折减有限元法中边坡失稳判据的研究[J].浙江大学学报:工学版,2008,42(1):83-87.L Qing,SUN Hong-yue,SHANG Yue-quan.Slopefailure criteria of shear strength reduction finiteelement method[J].Journal of Zhejiang University:Engineering Science,2008,42(1):83-87.
[8]杨永兵.边坡岩石强度与岩体强度的工程变换[J].金属矿山,2004(9):10-12.YANG Yong-bing.Engineering conversion of strengthbetween slope rock and rock mass[J].Metal Mine,2004(9):10-12.
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