软弱基座陡崖上危岩崩落序列
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摘要
陡崖或陡坡下岩性差异风化形成的岩腔是危岩崩落的起因。群发性破坏机理必须考虑危岩体之间的相互作用。基于危岩块相互作用力学机制,采用危岩块转动角度来衡量危岩体之间的相互作用,计算出不考虑相互作用(含等效)时危岩体的转动角度,运用能量守恒原理得到各危岩体相互作用后的实际转动角度,由转动角度建立了各危岩体的等效弯矩计算式。基于断裂力学和损伤力学建立了危岩体崩落时间的计算方法,并通过计算实例初步验证了该方法的有效性。
Rock cells formed by the effects of different weathering of lithology of cliffs or steep slopes are the cause for collapse of perilous rock.The mechanism of massive failure must consider the interaction of perilous rock.Based on perilous rock mechanics,the interaction of perilous rock is estimated by rotation angle of the rock.First,the rotation angle without consideration of the interation of perilous rock(considering equivalent) is calculated.Then,the rotation angle with consideration of the interation of perilous rock by the law of conservation of energy is acquired.Finally,the formula to calculate the equivalent bending moment of rock by rotation angle is obtained.The formula to estimate the time for rock collapse based on the principle of fracture mechanics and damage mechanics is also established.
Rock cells formed by the effects of different weathering of lithology of cliffs or steep slopes are the cause for collapse of perilous rock.The mechanism of massive failure must consider the interaction of perilous rock.Based on perilous rock mechanics,the interaction of perilous rock is estimated by rotation angle of the rock.First,the rotation angle without consideration of the interation of perilous rock(considering equivalent) is calculated.Then,the rotation angle with consideration of the interation of perilous rock by the law of conservation of energy is acquired.Finally,the formula to calculate the equivalent bending moment of rock by rotation angle is obtained.The formula to estimate the time for rock collapse based on the principle of fracture mechanics and damage mechanics is also established.
引文
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[2]RICHARD J C,STANLEY A S,DAVID E S.Geomorphology[M].Cambridge:The University Press of Cambridege,1984:255–275.
[3]CHEN H K,TANG H M,YE S Q.Damage model of control fissure in perilous rock[J].Applied Mathematics and Mechanics,2006,27(7):967–974.
[4]CHEN H K,TANG H M.Method to calculate fatigue fracture life of control fissure[J].Applied Mathematics and Mechanics,2007,28(5):643–649.
[5]陈洪凯,唐红梅,王蓉.三峡库区危岩稳定性计算方法及应用[J].岩石力学与工程学报,2004,23(4):614–619.(CHEN Hong-kai,TANG Hong-mei,WANG Rong.Calculation method of stability for unstable rock and application to the Three Gorges Reservior[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(4):614–619.(in Chinese))
[6]唐红梅,易朋莹.危岩落石运动路径研究[J].重庆建筑大学学报,2003,25(1):17–23.(TANG Hong-mei,YI Peng-ying.Research on dangerous rock movement route[J].Journal of Chongqing Jianzhu University,2003,25(1):17–23.(in Chinese))
[7]LUUK K,DORREN A,ARIE C SEIJMONSBERGEN.Comparison of three GIS-based models for predicting rockfall runout zones at a regional scale[J].Geomorphology,2003,56:49–64.
[8]AGLIARDI F,CROSTA G B.High resolution three-dimensional numerical modelling of rockfalls[J].International Journal of Rock Mechanics&Mining Sciences.2003,40:455–471.
[9]CHEN H K,TANG H M.Chained mechanism and moving routine for perilous rock to avalanche in the area of the Three Gorges Reservoir of China[C]//Proceedings of China Association for Science and Technology.Beijing,2006:501–506.
[10]陈洪凯.三峡库区危岩链式规律的地貌学解译[J].重庆交通大学学报(自然科学版),2008,27(1):92–95.(CHEN Hong-kai.Geomorphology research on chained regularity of perilous rock in the area of the Three Gorges Reservoir[J].Journal of Chongqing Jiaotong University,2008,27(1):92–95.(in Chinese))
[11]ANTONIO B,HERBERT H E.Numerical modeling of fracture coalescence in a model rock material[J].International Journal of Fracture,1998,92:221–252.
[12]OMER M,ABDEL K U.Fracture mechanisms of offset rock joints:a laboratory investigation[J].Geotechnical and Geological Engineering,2004,22:545–562.
[13]余寿文,冯西桥.损伤力学[M].北京:清华大学出版社,1997:21–25.(YU Shou-wen,FENG Xi-qiao.Damage mechanics[M].Tsinghua University Press,1997:21–25.(in Chinese))
[14]DB50/5029—2004地质灾害防治工程设计规范[S].2004:58–72.(DB50/5029—2004 Design criterion of geological disaster’s prevention and cure engineering[S].2004:58–72.(in Chinese))
[15]中国航空研究院.应力强度因子手册[M].北京:科学出版社,1981.(Chinese Aeronautical Establishment.Handbook of stress intension factor[M].Beijing:Science Press,1981.(in Chinese))
[16]CHEN H K,TANG H M,ZHU H.Research on duration for perilous rock to form[J].WSEAS Transaetions on Applied and Theoretical Mechanics,2006,1(2):169–173.
[17]孙宗颀,饶秋华,王挂尧.剪切断裂韧度(KIIC)确定的研究[J].岩石力学与工程学报,2002,21(2):199–203.(SUN Zong-qi,RAO Qiou-hua,WANG Gui-yao.Study on determination of shear fracture toughness(KIIC)[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(2):199–203.(in Chinese))
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