摘要
随着地下工程开挖深度的增加,深部洞室围岩将产生不同于浅部洞室的分区破裂现象。为深入研究深部岩体分区破裂现象的形成机制和影响因素,以淮南矿区丁集煤矿的深部巷道为工程背景,利用模型相似材料和高地应力真三维加载模型试验系统,首次开展了带有软弱夹层的层状节理岩体的真三维地质力学模型试验。结果表明:(1)在满足一定应力条件下,带有软弱夹层的层状节理试验模型出现明显的分区破裂现象;(2)软弱夹层是影响层状节理岩体分区破裂现象的重要因素,在相同的应力条件下,软弱夹层使得巷道围岩的径向位移和应变明显增加;并且软弱夹层的间距越小,洞周破裂区的层数越多,范围越大;(3)洞周破裂区的形状近似为圆形,与是否存在软弱夹层及软弱夹层间距均无关。模型试验结果有效揭示了分区破裂的影响因素,为深入研究高地应力深部岩体的非线性变形破坏特征奠定了坚实的试验基础。
The zonal disintegration phenomena will appear with the increasing of the depth of underground engineering which are different from shallow cavern. In order to investigate the formation mechanism and influence factors of the zonal disintegration, the true 3D geomechanical model tests for layered jointed rock mass containing soft interlayer have been carried out for the first time. Taking the deep tunnel of Dingji coal mine in Huainan mine area as engineering background, the test adopt model similar material and numerical controlling true 3D loading model test system. The model test results show that：（1） Based on some kind of stress conditions, the zonal disintegration will appear in layered jointed test model containing soft interlayer. （2） Soft interlayer is an important influence factor for zonal disintegration of layered jointed rock mass. Under the same stress conditions, the radial displacements and strains of surrounding rock increase obviously because of soft interlayer. The smaller space of soft interlayer is, the larger range of fracture zone is. （3） The shape of tunnel fracture zone is circle approximately. The shape has no correlation with the soft interlayer and its space. The model test results help to reveal the formation mechanism and influence factor of zonal disintegration, which lays a solid test foundation for further studying nonlinear deformation characteristics and failure mechanism of deep rock mass.
出处
《岩土力学》
EI
CSCD
北大核心
2014年第8期2247-2254,共8页
Rock and Soil Mechanics
基金
国家自然科学基金项目资助(No.41172268)
国家自然科学基金项目资助(No.51279093)
国家科技重大专项(No.2011ZX05014)
关键词
深部岩体
分区破裂
数控真三维加载
相似材料模型试验
软弱夹层
deep rock mass
zonal disintegration
digital control true 3D loading
model test of similar material
soft interlayer
