宜昌某磷矿采场稳定性分析及安全回采研究

进行了采场稳定性分析,包括矿房跨度分析、矿柱尺寸验证等,经过理论计算,得到采矿方法中推荐的采场结构参数是可行的。进行了回采安全设施的设计,包括通风、防排水、防尘、爆破安全措施、开采过程安全措施、顶板管理安全措施、出矿设备安全措施等。

内蒙古某铅锌矿采场结构参数优化

内蒙古某矿山采用分段空场嗣后充填采矿法生产,为详细分析2种采场结构参数方案(矿柱长度分别为10 m和15 m)对应的采场稳定性情况,以位于矿区150 m水平、二采区范围内的矿房为研究对象,采用MIDAS-FLAC3D软件耦合建模数值模拟分析方法,讨论了不同矿柱长度下矿体上下盘及顶底板的应力、位移和塑性区的力学响应规律。研究表明:2种方案对应的采场稳定性良好,考虑到高效开采要求,推荐选择矿柱沿走向长度10 m、采场沿走向长度40 m、采场宽度20 m、阶段高度90 m为采场最佳结构参数。

Fractal characterization for the mining crack evolution process of overlying strata based on microseismic monitoring technology

In order to study the evolution laws during the development process of the coal face overburden rock mining-induced fissure,we studied the process of evolution of overburden rock mining-induced fissures and dynamically quantitatively described its fractal laws,based on the high-precision microseismic monitoring method and the nonlinear Fractal Geometry Theory.The results show that:the overburden rock mining-induced fissure fractal dimension experiences two periodic change processes with the coal face advance,namely a Small→ Big→ Small process,which tends to be stable;the functional relationship between the extraction step distance and the overburden rock mining-induced fissure fractal dimension is a cubic curve.The results suggest that the fractal dimension reflects the evolution characteristics of the overburden rock mining-induced fissure,which can be used as an evaluation index of the stability of the overburden rock strata,and it provides theoretical guidance for stability analysis of the overburden rock strata,goaf roof control and the support movements in the mining face.

Analysis and research of long-term stability about the gob site in Northern Shaanxi Province

Based on the analysis of the basic characteristics for the gob site in Northern Shaanxi Province and the room and pillar mining way about coal mine, the variety rule of the coal beds below the site was studied by the using of FEM during the process of coal mining. The statuses of the stresses and strains and the varieties of the plastic area were simulated in the whole rock and coal pillars. The characters of stresses and deformation of the gob area of the coalmine were analyzed and evaluated after the site built in weathering. Moreover, the long-term stability of the gob area was predicted. As a result, the deformation of the gob area under the site is not been finished, and there is the danger that the gob site will collapsing as a whole; therefore, relative measures must be taken.

程潮铁矿深部矿体合理回采顺序研究

程潮铁矿目前东区采用崩落法、西区采用充填法开采,由于西区地表选厂即将整体搬迁,西采区深部将改用无底柱崩落法采矿,开采深度也即将到达-500m水平。在采场上方同时存在崩落散体和充填法采场的条件下,研究了-500m水平采场采用无底柱分段崩落法采矿的回采顺序问题。由于矿体厚度较大、长度较长,回采顺序较多,通过对不同开采方案的数值模拟结果算出采场的围岩不稳定性系数,通过采场的稳定性情况对比分析,得出几种开采方案中方案一较优。