不同应力环境下巷道开挖卸荷岩爆模拟实验研究

发布时间：2018-09-16 21:52

【摘要】：采用Plaxis 3D数值模拟软件,以应力环境对巷道岩爆的影响问题为切入点,从位移云图、应力应变曲线和塑性点分布等方面开展不同应力对巷道岩爆问题的研究工作,为巷道岩爆预防及治理提供研究基础。研究结果表明,巷道开挖卸荷过程中,圆形巷道左右两侧同时出现了应力集中和位移集中,此部位最易发生岩爆。开挖过程中,根据周围岩体距巷道侧壁的厚度的关系,可将开挖操作对周围岩体的影响划分为"开始变大"、"明显增大"、"急剧增加"三个区域。巷道的左右两侧壁会产生高应力集中区和位移集中区,最大应力随着水平应力的增加呈线性增长,巷道发生位移集中区域的面积与水平应力呈指数型正相关关系变化。位移集中区域中心与巷道侧壁的距离是圆形巷道半径的2/5,随着应力的增加,位移集中区域向周围扩张,岩爆的程度及影响范围也随之增大。
[Abstract]:With the help of Plaxis 3D numerical simulation software, with the effect of stress environment on rock burst of roadway as the breakthrough point, the research work of different stress on rock burst problem of roadway is carried out from the aspects of displacement cloud map, stress-strain curve and plastic point distribution, etc. It provides the research foundation for the prevention and control of rock burst in roadway. The results show that the stress concentration and displacement concentration occur simultaneously on the left and right sides of the circular roadway during the excavation and unloading process of the roadway and the rock burst is most likely to occur in this part. In the course of excavation, according to the relation between surrounding rock mass and side wall of roadway, the influence of excavation operation on surrounding rock mass can be divided into three regions: "start to get bigger", "obviously increase" and "increase sharply". High stress concentration zone and displacement concentration zone will be produced on the left and right sides of roadway. The maximum stress increases linearly with the increase of horizontal stress, and the area of displacement concentration area in roadway is positively correlated with horizontal stress. The distance between the center of the displacement concentration area and the side wall of the roadway is 2 / 5 of the radius of the circular roadway. With the increase of the stress, the concentrated area of displacement expands to the surrounding area, and the degree of rockburst and the influence range also increase.
【作者单位】：华北理工大学矿业工程学院;华北理工大学河北省矿业开发与安全重点实验室;
【基金】：国家自然科学基金项目资助(编号:51374088,51574102) 河北省高等学校科学技术研究项目资助(编号:QN2016125;QN2016124) 华北理工大学科学研究基金资助(编号:Z201501;Z201315)
【分类号】：TD32

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