摘要
鉴于离散单元法在处理富含节理面的岩体方面比常规有限元有明显优势,首先分析Barton-Bandis(B-B)节理模型加卸载时的应力应变关系和剪胀规律,然后建立基于B-B节理模型的重力坝加(卸)载模型,通过记录监测点位移历程,探讨坝体及坝基软弱结构面在加卸载作用下的位移变化规律,并提出强度转换公式,将B-B节理模型强度转换成等效M-C模型的粘聚力和摩擦角,发现随着加卸载次数的增多,转换后的节理强度逐渐减小。
Discrete element method has obvious advantages than FEM in simulating jointed rock mass.Firstly,the stress-strain relationship and dilatancy rule of Barton-Bandis（B-B）joint model was analyzed under loading and unloading.Then gravity dam loading（unloading）model based B-B joint model was established.By recording displacement variety of key points,the deformation law of dam body and weak structural plane in dam foundation was studied under action of loading and unloading.Meanwhile,the strength conversion formula was put forward,which could convert B-B joint model＇s strength parameters to equivalent cohesive and friction angle of M-C model.The results show that with the increase of the number of loading and unloading,the converted joint strength decrease gradually.
出处
《水电能源科学》
北大核心
2016年第2期69-72,共4页
Water Resources and Power
基金
江西省水利厅科技项目(KT201301)
