焦家金矿某巷道原采用U字钢+槽钢棚顶支护,因U字钢顶板及右帮出现不同程度冒落导致修复难度较大,针对支护区巷道冒顶破坏的原因,提出并通过试验对比,最终确定了菱形支护+发泡材料A、B配比1∶0.95充填控顶的技术方案.理论分析和现场工业试验证明,采用菱形支护+发泡材料A、B配比1:0.95充填控顶技术有效控制了巷道顶板冒落,能够确保巷道在采动应力作用下的稳定.

顶底板松软的综采工作面回撤巷道受采动影响,极易出现顶板岩层破碎下沉、煤壁片帮严重等问题.通过利用电脑圆图仪观测支架工作阻力,同时通过钢卷尺测量支架活柱缩量及现场记录宏观矿压显现和岩层运动的矿压观测方法,总结出回撤巷道受采动影响主要经历巷道相对稳定、受采动影响产生突变和采动影响显著3个阶段.研究成果为下一步回撤巷道支护参数优化提供了依据.

内蒙古福城煤矿采掘接续紧张,沿空掘进巷道在掘进和工作面回采期间维护困难.在9煤工作面巷道布置矿压观测仪器,通过现场实测确定了9煤巷道变形特征,揭示了9煤沿空掘进巷道维护困难的原因,对矿井安全高效开采具有指导意义.

利用现场实测的方法,确定了工作面推进过程中侧向煤体支承压力的分布特征.结合数值模拟,确定出福城煤矿受采动影响的沿空掘巷小煤柱的合理宽度,降低了巷道在掘进和工作面回采期间的维护难度,对矿井的安全高效开采具有指导意义.

Considering the large deformation of surrounding rock and the difficulty of roadway support under the influence of lateral mining, the mining environment of gob-side entry driving is analysed under the influence of intensive mining. The distribution rule of deformation and stress of surrounding rock of roadway is investigated with different width of coal pillar through numerical simulation. The reasonable width of coal pillar of gob-side entry driving under the influence of intensive mining is determined through a combined method of theoretical analysis, numerical simulation and field measurement.

The clustering behavior of a mono-disperse granular gas is experimentally studied in an asymmetric two-compartment setup. Unlike the random clustering in either compartment in the case of symmetric configuration when lowering the shaking strength to below a critical value, the directed clustering is observed, which corresponds to an imperfect pitchfork bifurcation. Numerical solutions of the flux equation using a modified simple flux function show qualitative agreements with the experimental results. The potential application of this asymmetric structure is discussed.

A bi-disperse granular gas in an asymmetrical two-compartment system is studied experimentally.The presence of asymmetry within the range of our experimental parameters results in a directed segregated state and a directed clustering state.This deterministic system does not depend on the initial conditions.A modified flux model based on Lohse’s flux model for bi-disperse granular gases is derived.The modified flux model explains qualitatively the experimental results.

A 3-D molecular dynamics simulation of a bi-disperse vibro-fluidized granular gas in a cyclic three-compartment cell is performed. A cluster of particles is randomly found in one of the compartments. Lohse's flux model is modified to incorporate inelastic particle-boundary collisions. This model predicts that periodically there is clustering in each compartment. It is then found that if the model is further modified to incorporate Gaussian white noise, it correctly predicts the non-sequential clustering behavior confirming that there is no chaotic behavior.