高边坡卸荷变形的梁-颗粒模型模拟  

Simulation on unloading induced deformation of a high slope by beam-particle model

作　　者：刘军[1] 赵长冰[2] 云斌[2] 余东晓[3] 

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室土木与交通学院,江苏南京210098 [2]河海大学岩土工程科学研究所,江苏南京210098 [3]武汉钢铁集团矿业有限责任公司乌龙泉矿,湖北武汉430213

出　　处：《中国矿业大学学报》2011年第5期691-696,共6页Journal of China University of Mining & Technology

基　　金：国家重点基础研究发展计划(973)项目(2007CB714104);国家自然科学基金项目(51044003)

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.

关 键 词：离散元 梁-颗粒模型 岩质高边坡 卸荷变形 

分 类 号：TU2[建筑科学—建筑设计及理论]