岩体力学参数对巷道变形特性的影响程度分析

发布时间：2018-09-11 20:52

【摘要】：以程潮铁矿为工程背景,基于室内试验及现场测量分别得到主要矿岩的物理力学性质、节理结构及力学参数、地应力大小及分布.利用3DEC离散元软件,通过对不同方案的模拟计算,对节理面影响进行单因素和多因素敏感性分析,并对岩体的等效连续特征进行分析.结果表明,不同参数对巷道变形的影响程度由大到小依次是:完整岩石的内摩擦角内聚力节理剪切刚度(JKS)节理法向刚度(JKN)节理内摩擦角抗剪强度.当模型中不包含节理时,塑性模型的巷道最大位移是弹性模型的2.5~2.8倍;当有节理时,塑性模型的巷道位移是弹性模型的1.8~4.4倍.当等效连续模型使用的参数为节理岩体参数的40%~50%时,等效连续模型和非等效连续模型会达到比较相似的结果.数值模拟结果与现场监测数据较吻合,验证了研究成果的准确性.
[Abstract]:Taking Chengchao Iron Mine as the engineering background, the physical and mechanical properties, joint structure and mechanical parameters, the magnitude and distribution of in-situ stress of the main ore rocks are obtained based on laboratory tests and field measurements. By using the 3DEC discrete element software, the single factor and multi-factor sensitivity analysis of joint surface influence is carried out through the simulation calculation of different schemes, and the equivalent continuous characteristics of rock mass are analyzed. The results show that the degree of influence of different parameters on roadway deformation is in the order of internal friction angle cohesion shear stiffness (JKS) joint normal stiffness (JKN) joint internal friction angle shear strength of intact rock. When joints are not included in the model, the maximum displacement of the roadway in the plastic model is 2.5 or 2.8 times that of the elastic model, and in the case of joints, the displacement of the roadway in the plastic model is 1.8or 4.4 times that of the elastic model. When the parameters of the equivalent continuous model are 40 ~ 50 of the parameters of the jointed rock mass, the equivalent continuous model and the non-equivalent continuous model will achieve relatively similar results. The numerical simulation results are in good agreement with the field monitoring data, which verifies the accuracy of the research results.
【作者单位】：北京科技大学土木与资源工程学院;
【基金】：国家自然科学基金资助项目(51374033) 中国博士后科学基金资助项目(2016M591080)
【分类号】：TD322

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