基于地震时程曲线的块体动安全系数计算
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摘要
基于块体理论分析方法中的矢量分析方法,编制计算程序研究地震时程曲线下的块体稳定性。具体的研究思路是:首先输入所需的结构面与临空面信息,然后根据有限性定理和可动性定理判断有限性和可动性,在块体可动的基础上,再找出块体在自重以及地震荷载共同作用下的滑动模式(单面滑动或双面滑动),最后求出块体在该滑动模式下的安全系数,得到动安全系数时程曲线。将画块体程序加入其中,以便于为考虑黏聚力时提供接触面面积以及块体体积等相关信息。
The block stability based on earthquake time-history curve is studied by computation program.Vector analysis of block theory is adopted for programming.The detailed approach involves the following procedures: input the required information of structural planes and free faces,and subsequently determine the finiteness and mobility of the block according to finiteness theorem and mobility theorem.If the block is movable,find out the sliding mode of the block(single face sliding or double face sliding) under the combined action of dead weight and seismic loads.Finally compute the safety factor under that sliding mode and draw the time-history curve of dynamic safety factor.In addition,a block drawing program is added to obtain information regarding the contact area between each face and the volume of the block required for the computation when the cohesion between the blocks is considered.
The block stability based on earthquake time-history curve is studied by computation program.Vector analysis of block theory is adopted for programming.The detailed approach involves the following procedures: input the required information of structural planes and free faces,and subsequently determine the finiteness and mobility of the block according to finiteness theorem and mobility theorem.If the block is movable,find out the sliding mode of the block(single face sliding or double face sliding) under the combined action of dead weight and seismic loads.Finally compute the safety factor under that sliding mode and draw the time-history curve of dynamic safety factor.In addition,a block drawing program is added to obtain information regarding the contact area between each face and the volume of the block required for the computation when the cohesion between the blocks is considered.
引文
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[2]王思敬,张菊明.岩体结构稳定性的块体力学分析[J].地质科学,1980,(1):19-33.(WANG Si-jing,ZHANG Ju-ming.On the Block Mechanics for StabilityAnalysis of Rock Mass Structure[J].Chinese Journal ofGeology,1980,(1):19-33.(in Chinese))
[3]石根华.岩体稳定性分析的赤平投影方法[J].中国科学,1977,(3):260-271.(SHI Gen-hua.Stereo-graphic Projection Methods on Rock Block Stability Anal-ysis[J].Science in China,1977,(3):260-271.(inChinese))
[4]GOODMAN R E,SHI G H.Block Theory and Its Appli-cation to Rock Engineering[M].Englewood Cloffs,NewJersey:Prentice-hall,Inc.,1985.
[5]邬爱清.三峡工程临时船闸及升船机岩体边坡块体稳定性及加固效果研究[R].武汉:长江科学院,1997.(WU Ai-qing.Study on the Block Stability and Rein-forcement Effect of Temporary Shiplock and Boatlift SlopeRock Mass at Three Gorges Project[R].Wuhan:Yan-gtze River Scientific Research Institute,1997.(in Chi-nese))
[6]张奇华,邬爱清.基于凹形区分类的块体几何形态分析方法[J].岩土工程学报,2005,27(3):299-303.(ZHANG Qi-hua,WU Ai-qing.Morphological AnalysisMethod of Block Based on Classification of Concave Zone[J].Chinese Journal of Geotechnical Engineering,2005,27(3):299-303.(in Chinese))
[7]张奇华.基于块体加与减算法的岩石块体几何形态分析[J].水利学报,2006,37(4):418-424.(ZHANGQi-hua.Morphological Analysis of Rock Blocks by BlockAdding-Subtracting Method[J].Journal of Hydraulic En-gineering,2006,37(4):418-424.(in Chinese))
[8]刘锦华,吕祖珩.块体理论在工程岩体稳定分析在中的应用[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))
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