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| 1 | Simulation research on the influence of eroded primary key strata on dynamic strata pressure of shallow coal seams in gully terrain显示文摘In Huojitu Coal Mine of Shendong mining area, the dynamic strata pressure (DSP) accidents occurred when the working faces passed the gully terrain. Focusing on this problem, we used physical simulation experimental method to thoroughly study the influence of eroded overlying primary key strata (PKS) in the gully terrain on DSP of shallow coal seams in this paper. The result show that when mining activities took place in the uphill section of shallow coal seams in gully terrain and the PKS were eroded, the blocks could not form stable bond-beam structures since the horizontal force of PKS blocks in adjacent sloping surfaces were relatively small. The sliding instability of blocks caused rapid increase of the load on the sub-key strata (SKS) blocks, which resulted into coal slide and roof fall as well as sharp drop of active columns. This led to DSP phenomenon. When the PKS blocks were intact, there was no DSP phenomenon to enable blocks provide certain horizontal force to maintain stable bond-beam structure. The simulation results were verified by the mining practices of working face 21306 crossing the gully terrain in the Huojitu Coal Mine. | Zhang Zhiqiang Xu Jialin Zhu Weibing Shan Zhenjun | 2012 | International Journal of Mining Science and Technology2012，22，1： | 12 |
| 2 | Comparing the reinforcement capacity of welded steel mesh and a thin spray-on liner using large scale laboratory tests显示文摘Steel mesh is used as a passive skin confinement medium to supplement the active support provided by rock bolts for roof and rib control in underground coal mines. Thin spray-on liners(TSL) are believed to have the potential to take the place of steel mesh as the skin confinement medium in underground mines.To confirm this belief, large scale laboratory experiments were conducted to compare the behaviour of welded steel mesh and a TSL, when used in conjunction with rock bolts, in reinforcing strata with weak bedding planes and strata prone to guttering, two common rock conditions which exist in coal mines. It was found that while the peak load taken by the simulated rock mass with weak bedding planes acting as the control sample(no skin confinement) was 2494 kN, the corresponding value of the sample with 5 mm thick TSL reinforcement reached 2856 kN. The peak load of the steel mesh reinforced sample was only2321 kN, but this was attributed to the fact that one of the rock bolts broke during the test. The TSL reinforced sample had a similar post-yield behaviour as the steel mesh reinforced one. The results of the large scale guttering test indicated that a TSL is better than steel mesh in restricting rock movement and thus inhibiting the formation of gutters in the roof. | Zhenjun Shan Porter Ian Nemcik Jan Baafi Ernest | 2014 | International Journal of Mining Science and Technology2014，24，3： | 5 |
| 3 | Novel pegiviruses infecting wild birds and rodents显示文摘Pegivirus(family Flaviviridae)is a genus of small enveloped RNA viruses that mainly causes blood infections in various mammals including human.Herein,we carried out an extensive survey of pegiviruses from a wide range of wild animals mainly sampled in the Qinghai-Tibet Plateau of China.Three novel pegiviruses,namely Passer montanus pegivirus,Leucosticte brandti pegivirus and Montifringilla taczanowskii pegivirus,were identified from different wild birds,and one new rodent pegivirus,namely Phaiomys leucurus pegivirus,was identified from Blyth's vole.Interestingly,the pegiviruses of non-mammalian origin discovered in this study substantially broaden the host range of Pegivirus to avian species.Co-evolutionary analysis showed virus-host co-divergence over long evolutionary timescales,and indicated that pegiviruses largely followed a virus-host co-divergence relationship.Overall,this work extends the biodiversity of the Pegivirus genus to those infecting wild birds and hence revises the host range and evolutionary history of genus Pegivirus. | Wentao Zhu Jing Yang Shan Lu Yuyuan Huang Dong Jin Ji Pua Liyun Liu Zhenjun Li Mang Shi Jianguo Xu | 2022 | Virologica Sinica2022，37，2： | 0 |
| 4 | Uniaxial compressive behaviour of a FRP standing support made of mine wastes显示文摘Twenty-seven specimens were tested to investigate the uniaxial compression behaviour of an innovative standing support for underground space applications.The innovative standing support consisted of an external fibre reinforced polymer(FRP)jacket and the infill column made of cementitious grout,tailings and coal wash rejects.Effects of the FRP layers number and water to the cementitious grout(w/g)ratio were evaluated.Test results indicated that lower w/g ratios produced stronger infill columns.With FRP confinement,the standing support demonstrated strain-hardening loading characteristics with a significant improvement in both strength and ductility.The highest strength and strain of the specimens achieved was 58.4 MPa and 11.8%respectively.Compared with the unconfined specimens,the confinement with four FRP layers increased the specimen strength and associated strain up to 3.6 and 27.0 times respectively.A correlation between the compressive strength of the infill material and the ultrasonic pulse velocity was also investigated.Furthermore,a simple design-oriented model was proposed to predict the peak strength and the corresponding strain of the innovative standing support. | Zhenjun Shan Ting Ren Jan Nemcik Guanzheng Wu Liang Zhao | 2023 | International Journal of Mining Science and Technology2023，33，8： | 0 |
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