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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。
In view of the obvious advantages of discrete element method in treating rock mass with joint surface, the stress-strain relationship and dilatancy law of Barton-Bandis (BB) joint model during loading and unloading are analyzed firstly. Then, the BB joint model , The displacement of the dam and the weak foundation of the dam foundation under loading and unloading is investigated by recording the displacement history of the monitoring points. The intensity conversion formula is proposed to convert the strength of the BB joint model into the equivalent MC model cohesion and friction angle, found that with the increase in the number of unloading, the joint strength after the transfer gradually reduced.