摘要
在金属矿山崩落转充填开采过程中,隔离矿柱作为浅部向深部延伸的衔接部分,其合理尺寸的留设对于实现矿山安全高效回采具有重要意义.针对内蒙古某铅锌矿深部崩落转充填开采这一实际情况,对水平隔离矿柱建立了厚板力学模型.考虑到连续板联结处的弯矩不可忽略,基于中厚板理论推导得出了对边简支对边固支条件下的应力表达式.采用前处理软件HyperMesh构建矿区高精度六面体网格模型,并将矿区三维地质模型导入有限差分软件FLAC^(3D)之中,以705中段及上部围岩塑性区体积为依据近似得出作用在隔离矿柱之上的均布荷载,并应用最大拉应力理论计算出隔离矿柱安全厚度为20 m.利用数值模拟软件分析了所留水平隔离矿柱的力学行为及其稳定性.结果表明:隔离矿柱沉降值与塑性区均控制在容许范围之内,稳定性良好,验证了所留隔离矿柱厚度的合理性.
In the process of mining from caving to filling method in metal mines, it is significant to reserve reasonable size of insulating pillar, being considered as a connecting part from shallow to deep excavation, so as to realize safe and efficient mining. According to the field engineering condition of a lead zinc mine in Inner Mongolia, the thick plate mechanical model was established for the horizontal insulating pillar. Considering the fact that the moment at the support of the continuous plate cannot be neglected, a stress expression where the boundary condition of clamped along two sides and simply supported along other two sides was deduced based on the refined plate theory. The 3 D geological model was established by the pre-processing software HyperMesh accurately, in which all the elements were hexagonal rather than quadrangular. Then the model was imported to a commercial code named FLAC3 D. The uniformly distributed load acting on the insulating pillar was calculated and successfully applied in the model on basis of the plastic zone volume of surrounding rock above 705 level, and the thickness of the insulating pillar was calculated to be 20 m according to the maximum tensile stress theory. Finally, the mechanical behavior and stability of the designed insulating pillar was numerically analyzed. Numerical results indicate that the settlement value and plastic zone of the insulating pillar were controlled within allowable range due to the favorable stability, which validate the rationality of the designed thickness of reserved insulating pillar.
作者
李夕兵
彭定潇
冯帆
李小松
LI Xibing;PENG Dingxiao;FENG Fan;LI Xiaosong(School of Resources and Safety Engineering,Central South University,Changsha,Hunan 410083,China;College of Mining and Safety Engineering,Shandong University of Science and Technology,Qingdao,Shandong 266590,China)
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2019年第3期484-494,共11页
Journal of China University of Mining & Technology
基金
国家重点研发计划项目(2016YFC0600706)
国家自然科学基金重点项目(41630642)
关键词
深部开采
隔离矿柱
中厚板理论
数值模拟
稳定性
deep mining
insulating pillar
refined plate theory
numerical simulation
stability
