地震作用下不定位块体动安全系数计算与评价方法的探讨
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摘要
用块体理论分析方法中的矢量分析方法计算块体动安全系数,具体的研究思路是:首先输入构成不定位块体所需的结构面和临空面信息,然后根据有限性定理和可动性定理判断块体的有限性和可动性,在块体可动的基础上,再找出块体在自重和地震荷载共同作用下的滑动模式(脱离、单面滑动或双面滑动),并求出块体在该滑动模式下的安全系数,通过循环所有的地震时刻,得到了动安全系数时程曲线。考虑到不同区间安全系数的权值,提出了一种新的动安全系数评价方法,对动安全系数的评价指标做了探索工作。
Considering the weight value of safety factors in different intervals,a new evaluation method for dynamic safety factor is proposed.Vector analysis method of the block theory is adopted for programming.The detailed research approach is presented as follows: first of all,the required information of structural planes and free face is input to form the unlocated block,and the finiteness and mobility of the block are determined subsequently according to finiteness theorem and mobility theorem.If the block is movable,find out the sliding mode(separating,single face sliding or double face sliding) of the block under the combined action of dead weight and seismic load as well as the safety factor under that sliding mode.Finally the time-history curve of dynamic safety factor is obtained by cycling all the earthquake times.This study can be regarded as an exploration in the evaluation index of dynamic safety factor.
Considering the weight value of safety factors in different intervals,a new evaluation method for dynamic safety factor is proposed.Vector analysis method of the block theory is adopted for programming.The detailed research approach is presented as follows: first of all,the required information of structural planes and free face is input to form the unlocated block,and the finiteness and mobility of the block are determined subsequently according to finiteness theorem and mobility theorem.If the block is movable,find out the sliding mode(separating,single face sliding or double face sliding) of the block under the combined action of dead weight and seismic load as well as the safety factor under that sliding mode.Finally the time-history curve of dynamic safety factor is obtained by cycling all the earthquake times.This study can be regarded as an exploration in the evaluation index of dynamic safety factor.
引文
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[7]张建海,范景伟,何江达.用刚体弹簧元法求解边坡、坝基动力安全系数[J].岩石力学与工程学报,1999,18(4):387-391.(ZHANG Jian-hai,FAN Jing-wei,HE Jiang-da.Dynamic Safety Evaluation of Slopes orDam Foundation Using Rigid Body-Spring Element Meth-od[J].Chinese Journal of Rock Mechanics and Engi-neering,1999,18(4):387-391.(in Chinese))
[8]张伯艳,陈厚群,杜修力.拱坝坝基抗震稳定分析[J].水利学报,2000,31(11):55-59.(ZHANG Bo-yan,CHEN Hou-qun,DU Xiu-li.Arch Dam Abutment Aseis-matic Stability Analysis[J].Journal of Hydraulic Engi-neering,2000,31(11):55-59.(in Chinese))
[9]赵剑明,陈宁,常亚屏.地震作用下土石坝边坡抗滑稳定性分析[C]∥环境岩土工程理论与实践.上海:同济大学出版社,2002:239-248.(ZHAO Jian-ming,CHEN Ning,CHANG Ya-ping.Stability Analysis of DamSlope Under Earthquake[C]∥Theory and Practice onEnvironmental Geotechnics.Shanghai:Tongji UniversityPress,2002:239-248.(in Chinese))
[10]刘红帅,唐立强,薄景山,等.确定岩质边坡地震安全系数的新方法[J].哈尔滨工程大学学报,2009,30(9):1007-1011.(LIU Hong-shuai,TANG Li-qiang,BO Jing-shan,et al.New Method for Determining theSeismic Safety Factor of a Rock Slope[J].Journal ofHarbin Engineering University,2009,30(9):1007-1011.(in Chinese))
[2]石根华.岩体稳定分析的几何方法[J].中国科学,1981,(4):487-495.(SHI Gen-hua.Geometric Methodof Rock Mass Stability Analysis[J].Science in China,1981,(4):487-495.(in Chinese))
[3]刘锦华,吕祖珩.块体理论在工程岩体稳定分析中的应用[M].北京:水利电力出版社,1988.(LIU Jin-hua,LV Zu-heng.Block Theory and Its Application toStability Analysis of Rock Engineering[M].Beijing:Water Conservancy and Electric Power Press,1988.(inChinese))
[4]刘红帅,薄景山,刘德东.岩土边坡地震稳定性分析研究评述[J].地震工程与工程振动,2005,25(1):164-171.(LIU Hong-shuai,BO Jing-shan,LIU De-dong.Review on Study of Seismic Stability Analysis of Rock-Soil Slopes[J].Earthquake Engineering and EngineeringVibration,2005,25(1):164-171.(in Chinese))
[5]NEWMARK N M.Effects of Earthquakes on Dams andEmbankments[J].Geotechnique,1965,15(2):139-160.
[6]刘汉龙,费康,高玉峰.边坡地震稳定性时程分析方法[J].岩土力学,2003,24(4):553-560.(LIU Han-long,FEI Kang,GAO Yu-feng.Time History AnalysisMethod of Slope Seismic Stability[J].Rock and Soil Me-chanics,2003,24(4):553-560.(in Chinese))
[7]张建海,范景伟,何江达.用刚体弹簧元法求解边坡、坝基动力安全系数[J].岩石力学与工程学报,1999,18(4):387-391.(ZHANG Jian-hai,FAN Jing-wei,HE Jiang-da.Dynamic Safety Evaluation of Slopes orDam Foundation Using Rigid Body-Spring Element Meth-od[J].Chinese Journal of Rock Mechanics and Engi-neering,1999,18(4):387-391.(in Chinese))
[8]张伯艳,陈厚群,杜修力.拱坝坝基抗震稳定分析[J].水利学报,2000,31(11):55-59.(ZHANG Bo-yan,CHEN Hou-qun,DU Xiu-li.Arch Dam Abutment Aseis-matic Stability Analysis[J].Journal of Hydraulic Engi-neering,2000,31(11):55-59.(in Chinese))
[9]赵剑明,陈宁,常亚屏.地震作用下土石坝边坡抗滑稳定性分析[C]∥环境岩土工程理论与实践.上海:同济大学出版社,2002:239-248.(ZHAO Jian-ming,CHEN Ning,CHANG Ya-ping.Stability Analysis of DamSlope Under Earthquake[C]∥Theory and Practice onEnvironmental Geotechnics.Shanghai:Tongji UniversityPress,2002:239-248.(in Chinese))
[10]刘红帅,唐立强,薄景山,等.确定岩质边坡地震安全系数的新方法[J].哈尔滨工程大学学报,2009,30(9):1007-1011.(LIU Hong-shuai,TANG Li-qiang,BO Jing-shan,et al.New Method for Determining theSeismic Safety Factor of a Rock Slope[J].Journal ofHarbin Engineering University,2009,30(9):1007-1011.(in Chinese))
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