摘要
针对大冶铁矿深凹露天转地下开采的实际情况,考虑岩性、断层和破碎带的影响,建立了错动界限计算模型。利用极限平衡理论和FLAC软件对转地下开采前的边坡稳定性进行了研究,分别分析了不同开采水平,塌陷区回填与不回填两种条件下的应力变化、塑性区分布和位移变化规律,并以地表水平变形为标准来圈定不同开采水平的地表错动范围。结果表明,随着开挖深度的增加错动角逐渐提高,开挖至-120m水平时,不回填条件下,上盘平均错动角为60.9°,下盘平均错动角为63.1°,回填可使下盘错动角提高1°,上盘错动角提高0.3°左右。
A calculation model for disturbed range was built in the light of the practical situation during the transfer from deep opencasting to underground mining at Dave Iron Mine and based on the effects of rock characters, fault and fractured zone. The limit equilibrium theory and FLAC software were used to study the slope stability before underground mining. The stress variation, plastic zone distribution and displacement variation laws were analyzed under the conditions of difterent mining levels and with the subsidence area backfilled or not. The deformation of surface level was served as standard to outline the disturbed range of the different mining levels. The results show that the disturbed angle became deeper as the digging depth increased. When the digging came up to 120m level under the unbackfilled condition, the average disturbed angle of the upper wall was 60.9° and that of the lower wall was 63.1°. The backfill made the distrurbed angle of the lower wall increase by 1° and of the upper wall by 0.3°.
出处
《金属矿山》
CAS
北大核心
2005年第9期18-22,共5页
Metal Mine
基金
教育部:"新世纪优秀人才支持计划"资助项目(编号:教技函2005[35]号)。
作者简介
杜建华（1979-），男，北京科技大学土木与环境工程学院，博士生，100083北京市海淀区学院路30号。
