摘要
岩体可视为非均质的多相复合结构,其内部存在各种天然裂隙。基于连续介质损伤力学及断裂力学理论,分别分析弹性阶段的初始损伤和开挖造成裂隙扩展的损伤,推导出裂隙岩体弹塑性损伤本构关系;通过二次开发将弹塑性损伤本构方程程序化,编译FLAC3D自定义裂隙岩体弹塑性损伤扩展本构模型。应用自定义本构模型对广西凤山县石灰岩矿山边坡进行数值模拟分析,结果表明:边坡中上部损伤度较高,两步开挖后产生较大的位移,即边坡中上部裂隙存在扩展贯通进而发生滑移的可能,应对该区域进行系统的锚固。
Rock is a kind of heterogeneous composite structure,in which there is a variety of natural fractures. Based on the continuum damage mechanics and fracture mechanics,it analyzed the initial damage of the elastic stage and extension damage of cracks caused by excavation,deduced the fractured rock mass elastoplastic damage constitutive relationship. P rogramming the elastoplastic damage constitutive equation by using secondary development,and compiling the FLAC3 Dcustom fractured rock mass elastoplastic damage entend constitutive model,and applying custom constitutive model for building materials limestone mine in Guangxi Fengshan slope numerical simulation,its results show that: the upper part of the slope has higher damage degree,and has a larger displacement after two steps excavation,which means the cracks in the upper part of the slope have the possibility of potential sliding as long as the cracks extending. It should be systematically reinforced.
出处
《人民黄河》
CAS
北大核心
2017年第2期123-127,共5页
Yellow River
