岩体采动沉陷的损伤效应

来源期刊：中国有色金属学报1999年第1期

论文作者：于广明 谢和平 杨伦 张玉卓

文章页码：185 - 188

关键词：岩体，采动沉陷，损伤效应

Key words：jointed rocks, surface subsidence, displacemen, damage variable

摘    要：矿山开采沉陷是具有初始损伤的岩体在采动应力作用下所发生的再变形和再破坏过程， 岩体中的初始损伤影响着岩体的力学行为和变形破坏特征， 因此， 研究和预测岩体采动沉陷， 必须考虑岩体的损伤效应。 通过构造具有初始损伤的岩体采动沉陷实验模型， 研究了岩体采动沉陷的损伤效应。 研究表明， 岩体采动沉陷量值主要取决于岩体中初始损伤在空间中的总占位， 其中的垂直移动量(下沉)取决于岩体中初始损伤在竖直平面内的总占位， 其占位越大， 下沉值越大； 水平移动量取决于岩体中初始损伤在水平面内的总占位， 其占位越大， 水平移动值越大。

Abstract: Surface displacement caused by coal mining is an extremely complex process, the existence of joints makes rock stratum express the behavior of nonlinearity, heterogeneity and anisotropy in macro-structure and deformation. Two kinds of physical model, one containing no initial joints and another containing some initial joints, were employed to investigate systematically the influence of initial joints on the surface subsidence. Moreover, within the framework of damage mechanics, the influence of initial joints on the surface displacement was investigated, and the empirical relations between the character value of surface displacement and damage variable were obtained.