矿井综采安全管理技术的应用分析

针对井下弱煤岩、松软低透围岩情况下综采作业采场冒顶事故、巷道垮落事故频发,严重应井下综采作业安全的现状,提出了一种新的矿井综采安全管理技术,通过支架-围岩控制技术及井下巷道主动支护技术提升了井下复杂地形条件下的综采作业安全。根据实际应用,新的综采安全管理技术能够将井下复杂地形条件下的综采效率提升17.3%,将井下巷道冒顶、垮落事故数量降低89.4%,对提升井下综采作业安全性和可靠性具有十分重要的意义。

煤矿综采放顶煤安全开采问题研究

随着社会的不断进步,我国的煤矿事业得到了更多的重视,大众日常生活与生产对于煤炭能源需求量直线升高,由此面临新情况就是煤炭单位务必强化创新型开采煤炭方式深入探究,力争高产量的开采煤炭方式,全面促进国内煤炭行业可持续发展。然而,就煤炭开采目前状况来讲,综采放顶煤为开采中厚煤层高效方式,务必强化此方式的深入研究。

基于安全评价体系的煤矿工作面安全预警系统设计

近些年来,煤炭行业高速发展,为提高综采工作面的安全性,必须将机械化与信息化结合起来,加强对智能化无人采煤的研究,通过大量收集综采工作面的数据信息,建立安全评价指标体系,构造综采工作面智能开采骨架,对生产过程实行自动化安全监督与信息管理,分析智能化综采工作面的监测数据,对数据进行挖掘、融合和处理,并与先进智能设备对接,全方位覆盖综采工作面生产环节,对工作面的安全状况进行评价,判断工作面状态,保障安全工作高效、顺利地开展,有助于煤炭产业实现全面升级,促使煤矿智能化技术开发实现质的飞跃。

煤矿井下矿压变化机理及巷道顶板防护的研究

煤矿井下的巷道顶板支护对保证井下综采作业安全具有十分重要的作用。针对井下煤层开采过程中工作面经常出现矿压波动,严重影响工作面安全的情况,对煤矿井下矿压的变化机理进行研究,提出了有针对性的巷道顶板支护新方案,有效降低了矿压变化的强度,提升了煤矿井下的综采作业安全。

Comprehensive safety factor of roof in goaf underdeep high stress

The safety factor of roof under deep high stress is a quantitative index for evaluating roof stability.Based on the failure mode of surrounding rock of stope roof,the mechanics model of goaf roof is constructed,and the internal force of roof is deduced by the theory of hingeless arch.The calculation method of roof safety factor(K)under the environment of deep mining is proposed in view of compression failure and shear failure of roof.The calculation formulas of shear safety factor(K1),compression safety factor(K2)and comprehensive safety factor(K)of roof are given.The influence of stope span and roof thickness on roof stability is considered in this paper.The results show that when the roof thickness remains constant,the roof safety factor decreases with the increasing of the stope span;when the stope span remains constant,the roof safety factor increases with the increasing of the roof thickness.The deep mining example shows that when the stope span is 30 m and the roof thickness is 10 m,the roof comprehensive safety factor is 1.12,which indicates the roof is in a stable state.

Minimum secure speed of fully mechanized coal face based on critical temperature of coal spontaneous combustion

The critical temperature theory of spontaneous combustion of coal and the numerical simulation method are used to explore the minimum secure speed of fully mechanized coal face to prevent the spontaneous combustion in goaf. Combined with the actual situation of workface 31005 in a coal mine, the highest temperatures in goal at different advancing speeds were obtained by the numerical simulation of spontaneous combustion in goal, and then a power function equation between the highest temperature and the advancing speed was achieved by regression analysis. The advancing speed corresponding to the critical temperature value was taken as the minimum safe speed of workface based on the equation. Finally, the accuracy and reliability of the speed were verified by the actual advancing process of workface 31005. The results of this research show that the new judgment method of the minimum safety speed has a higher value to be applied in the field.

Comprehensive experiment and evaluation on safety due to fully-mechanized mining under the Xitian River at Linxin Mine

L3414 mechanized mining working face (No.14 coal seam) of Lingxin Mine is under the Xitian River.The mining disturbed zone where rock properties and conditions have been changed due to mining, the safety and environmental protection were con- cemed greatly. Based on engineering geological environment of L3414 working face and mining factors, the color bore-bole TV inspecting, leakage of drilling fluid monitoring, simulation experiment, numerical computing, in-situ ground stress measurement and subsidence measurement, etal, these programs contribute to the formation of a scientific basis for control water safe mining and normal mining or environmental protection in the condition of existing fully-mechanized mining.