高边坡卸荷变形的梁-颗粒模型模拟
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摘要
为了模拟与预测岩质高边坡在开挖卸荷过程中的变形特征,把高边坡离散为由颗粒单元与梁网络组成的复合结构,用离散元法描述颗粒单元运动,通过颗粒间的相对位移计算梁的变形及梁端力,通过梁的变形与破坏体现介质的损伤与渐进变形,并通过对单轴抗压实验的模拟验证模型与程序的可靠性,对三峡永久船闸高边坡开挖卸荷变形进行了模拟.结果表明:模拟结果与实测结果吻合较好,相差3%左右,说明基于离散元框架内的梁-颗粒模型可以反映高边坡卸荷变形机理.
A beam-particle model was used to predict unloading induced deformation of a high rock slope.The discrete,composite structure was simulated with DEM to obtain particle movements.Beam deformation and end forces were obtained from the relative displacement of the beams.Beam ends were in contact with the particles and accumulated deformation,and damage,appears as deformation and fracture of the beams.The model and simulation code were verified by predicting the results of a uniaxial compression test.Then the model was used to simulate the deformation of a high slope from unloading.The field structure under consideration is the permanent ship lock of the Three Gorges dam.The simulations are in approximate agreement with the measurements: A difference of about 3% was observed.Hence,the model will predict the deformation of a high rock slope induced by unloading.
A beam-particle model was used to predict unloading induced deformation of a high rock slope.The discrete,composite structure was simulated with DEM to obtain particle movements.Beam deformation and end forces were obtained from the relative displacement of the beams.Beam ends were in contact with the particles and accumulated deformation,and damage,appears as deformation and fracture of the beams.The model and simulation code were verified by predicting the results of a uniaxial compression test.Then the model was used to simulate the deformation of a high slope from unloading.The field structure under consideration is the permanent ship lock of the Three Gorges dam.The simulations are in approximate agreement with the measurements: A difference of about 3% was observed.Hence,the model will predict the deformation of a high rock slope induced by unloading.
引文
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[3]蓝航.基于FLACK3D的边坡单元安全度分析及应用[J].中国矿业大学学报,2008,37(4):570-574.LAN Hang.Analysis of zone safety degree of slopesand its application based on FLACK3D[J].Journal ofChina University of Mining&Technology,2008,37(4):570-574.
[4]CUNDALL P A,STRACK O D L.A discrete nu-merical model for granular assemblies[J].Geotech-nique,1979(29):47-65.
[5]ZHANG Chu-han,PEKAU O A,JIN Feng,et al.Application of distinct element method in dynamic a-nalysis of high rock slopes and blocky structures[J].Soil Dynamics and Earthquake Engineering,1997,16(6):385-394.
[6]王吉亮,陈剑平,苏瑞生,等.节理岩体隧道塌方机理离散元研究[J].中国矿业大学学报,2008,37(5):316-319.WANG Ji-liang,CHEN Jian-ping,SU Rui-sheng,etal.Study of collapse mechanism of tunnels in jointedrock mass by distinct element method[J].Journal ofChina University of Mining&Technology,2008,37(5):316-319.
[7]WANG C,TANNANT D D,LILLY P A.Numeri-cal analysis of the stability of heavily jointed rockslopes using PFC2D[J].International Journal of RockMechanics and Mining Sciences,2003,40(3):415-424.
[8]KUN F,HERRMANN H J.A study of fragmenta-tion process using a discrete element method[J].Computer Methods in Applied Mechanics and Engi-neering,1996,138:3-18.
[9]KUN F,HERRMANN H J.Transition from dam-age to fragmentation in collision of solids[J].Physi-cal Review E,Statistical,1999,59(3):2623-2632.
[10]邢纪波.梁-颗粒模型导论[M].北京:地震出版社,1999:132-135.
[11]谢祚水,王自力,吴建国.计算结构力学[M].武汉:华中科技大学出版社,2004:103-105.
[12]HENTZ S,DAUDEVILLE L,DONZE F V.Iden-tification and validation of a discrete element modelfor concrete[J].Journal of Engineering Mechanics,ASCE,2004,130(6):709-719.
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