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| 1 | Underground pressure characteristics analysis in back-gully mining of shallow coal seam under a bedrock gully slope显示文摘我们在一个基岩溪谷斜坡下面在浅煤缝接在背溪谷采矿期间学习了地下的压力和它的机制,借助于物理模拟,数字建模并且地监视。结果证明地下的压力的紧张与它在 coalface 的相对位置有关。地下的压力是集中的,当 coalface 在溪谷的底部时,支持抵抗到达最大值,而地下的压力是中等的并且当 coalface 传递溪谷时,逐渐地减少。当斜坡在不稳定的、多边的块依赖了的采矿和形式组织的背溪谷期间在一个颠倒的方向旋转了到斜坡剧降时,这些变化的机制被分析,由于滑倒。当块破碎是小的时,多边的块的沉淀是可观的,导致在地下的压力的庞大的变化。随块身体的团的增加,块排水量将被减少与一起一增加在废矿由未破损的岩石和破岩石夹钳效果,导致地下的压力的减少。 | Wang Xufeng Zhang Dongsheng Fan Gangwei Zhang Chengguo | 2011 | Mining Science and Technology2011，21，1： | 16 |
| 2 | Characteristics and stability of slope movement response to underground mining of shallow coal seams away from gullies显示文摘Underground pressure is abnormal during mining of shallow coal seams under gullies. We studied gully slope movements, subject to underground mining, with physical simulation and theoretical analysis. The rules disclose that the slope rock slides horizontally in response to mining in the direction of gullies and rotates reversely with the appearance of a polygon block in mining away from gullies. We focused our attention on the case of mining away from a gully. We built a mechanical model in terms of a polygon block hinged structure and investigated the variation of horizontal thrust and shear force at the hinged point in relation to the rotation angle under different fragmentations. The Sliding-Rotation instability conditions of the polygon block hinged structure are presented based on the analyses of sliding instability and rotation instability. These results can serve as a theoretical guide for roof control during mining away from gullies in a coalfield defined by gullies. | Zhang Dongsheng Fan Gangwei Wang Xufeng | 2012 | International Journal of Mining Science and Technology2012，22，1： | 8 |
| 3 | Applicable conditions for a classification system of aquifer-protective mining in hallow coal seams显示文摘Based on the conclusions of domestic and foreign research, we have analyzed the collapse-fall characteristics of overlying strata and the mechanism of aquifer-protective mining in shallow coal seam working faces at the Shendong Mine. We have selected the height of the water-conducting fracture zone in overlying strata as a composite index and established the applicable conditions of aquifer-protective mining in shallow coal seams with a multi-factor synthetic-index classification method. From our calculations and analyses of variance, we used factors such as the overlying strata strength, mining disturbing factors and rock integrity as related factors of the composite index. We have classified the applicable conditions of aquifer-protective mining in shallow coal seams into seven types by comparing the result of the height of water-conducting fractured zones of long-wall and short-wall working faces with the thickness of the bedrock, the thickness of the weathered zone and the size of safety coal-rock pillars. As a result, we propose the preliminary classification system of aquifer-protective mining in shallow coal seams. It can provide a theoretical guidance for safe applications of aquifer-protective mining technology in shallow coal seams under similar conditions. | Liu Yude Zhang Dongsheng Fan Gangwei Yah Shoufeng | 2011 | Mining Science and Technology2011，21，3： | 4 |
| 4 | Suitable layout of gate roads related to slice mining in an ultra-thick unstable coal seam显示文摘We determined a suitable gate road layout in slice mining in an ultra-thick unstable coal seam,using theoretical analysis and numerical calculations.Based on plasticity theory in terms of limiting equilibrium,the width of chain pillar in the upper slice was calculated to be 18 m.The stress distribution in the chain pillar after the upper slice was mined out was described with numerical simulation.The extent of the effect of stress on the upper chain pillar on the lower solid coal was obtained on the basis of an elastic solution of a distributed force loaded on a half-plane.Three layout designs for lower gate roads were proposed and a stability factor was introduced to analyze the stability of the lower pillar with numerical calculation.Gate road translation was determined as the most suitable layout method,which maximizes the extraction rate on the basis of the pillar stability. | Fan Gangwei Zhang Dongsheng Zhou Lei | 2011 | Mining Science and Technology2011，21，4： | 2 |
| 5 | Mining-induced variation in water levels in unconsolidated aquifers and mechanisms of water preservation in mines显示文摘Phreatic water resources are widely found in thick unconsolidated surface layers in western China, where water levels respond sensitively and quickly to large-scale underground mining in conjunction with shallow coal seams. Longwall face #32201 of the Bulianta Coal Mine, in the Shendong coalfield was selected as an industrial trail base, where field observations on ground-water levels were conducted when the working face was below a water-rich area. The space-time variation in the behavior of un-consolidated water levels in response to underground mining and its relation with of advance were observed through the field trials. The basic conditions for water preservation in mines are presented and the mechanisms of water preservation in mining analyzed, given the geological condition of two key strata and a severely weathered layer buried in the overburden. The field trails show that water preservation in mining shallow coal seams can be successful under suitable conditions, providing new technology for envi-ronmental protection in the desert coalfields of northwestern China. | FAN Gangwei ZHOU Lei | 2010 | Mining Science and Technology2010，20，6： | 2 |
| 6 | Dynamic evolution characteristics of mining-induced fractures in overlying strata detected by radon显示文摘<正>For environment protection in mining areas in northwest China,we developed a CTSRM(comprehensive test system by radon measurement) to measure radon radioactivity and detect dynamic evolution characteristics of mining-induced fractures in overlying strata.It was used to simulate the relationship between the dynamic evolution characteristics and radon concentrations of 33201~# coalface at Bulianta coal mine in Inner Mongolia,and feasibility of the method was validate. | ZHANG Wei ZHANG Dongsheng MA Liqiang WANG Xufeng FAN Gangwei | 2011 | Nuclear Science and Techniques2011，22，6： | 2 |
| 7 | Mechanism of Roof Shock in Longwall Coal Mining under Surface Gully显示文摘 | Gangwei Fan Dongsheng Zhang Xufeng Wang | 2015 | Shock&Vibration2015，，： | 1 |
| 8 | Structural effect of a soft-hard backfill wall in a gob-side roadway显示文摘The stability of a backfill wall is critical to implement gob-side entry driving technology in which a small coal pillar is substituted by a waste backfill wall. Based on features of surrounding rock structures in the backfill wall, we propose a mechanical model on the structural effect of a soft-hard backfill wall using theory analysis, physical experiments and a numerical simulation. The results show that the deformation of the structure of the soft-hard backfill wall is coordinated with the roof and floor. The soft structure on the top of the backfill wall can absorb the energy in the roof by its large deformation and adapt to the given deformation caused by the rotation and subsidence of a key rock block. The hard structure at the bottom of the backfill wall can absorb the strong supporting resistance from the top surrounding rock. The soft structure on the top protecting the hard bottom structure by its large deformation contributes to the stability of the entire backfill wall. An application indicated that the stress in the backfill wall effectively decreased and its deformation was significantly reduced after the top coal remained. This ensured the stability of the backfill wall. | Wang Hongsheng Zhang Dongsheng Fan Gangwei | 2011 | Mining Science and Technology2011，21，3： | 1 |
| 9 | Design of comprehensive test system for detecting overlying strata mining-induced fractures on surface with radon gas显示文摘Based on radon gas properties and its existing projects applications, we firstly attempted to apply geo- physical and chemical properties of radon gas in the field of mining engineering, and imported radioac- tive measurement method to detect the development process of the overlying strata mining-induced fractures and their contained water quality in underground coal mining, which not only innovates a more simple-fast-reliable detection method, but also further expands the applications of radon gas detection technology in mining field. A 3D simulation design of comprehensive testing system for detecting strata mining-induced fractures on surface with radon gas (CTSR) was carried out by using a large-scale 3D solid model design software Pro/Engineer (Pro/E), which overcame three main disadvantages of ''static design thought, 2D planar design and heavy workload for remodification design'' on exiting design for mining engineering test systems. Meanwhile, based on the simulation design results of Pro/E software, the sta- bility of the jack-screw pressure bar for the key component in CTSR was checked with a material mechan- ics theory, which provided a reliable basis for materials selection during the latter machining process. | Zhang Wei Zhang Dongsheng Fan Gangwei | 2011 | Mining Science and Technology2011，21，6： | 1 |
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