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| 1 | Fixed-length roof cutting with vertical hydraulic fracture based on the stress shadow effect:A case study显示文摘Pre-driven longwall retracement roadway(PLRR)is commonly used in large mine shaft.The support crushing disasters occur frequently during the retracement,and roof management is necessary.Taking the 31107 panel as research background,the roof breaking structure of PLRR is analyzed.It is concluded that the roof cutting with vertical hydraulic fracture(HF)at a specified position,that is,fixed-length roof cutting,can reduce support load and keep immediate roof intact.The extended finite element method(XFEM)is applied to simulate hydraulic fracturing.The results show that both the axial and transverse hydraulic fracturing cannot effectively create vertical HFs.Therefore,a novel construction method of vertical HF based on the stress shadow effect(SSE)is proposed.The stress reversal region and HF orientation caused by the prefabricated hydraulic fracture(PF)are verified in simulation.The sub-vertical HFs are obtained between two PFs,the vertical extension range of which is much larger than that of directional hydraulic fracturing.The new construction method was used to determine the field plan for fixed-length roof cutting.The roof formed a stable suspended structure and deformation of the main PLRR was improved after hydraulic fracturing. | Feiteng Zhang Xiangyu Wang Jianbiao Bai Wenda Wu Bowen Wu Guanghui Wang | 2022 | International Journal of Mining Science and Technology2022，32，2： | 4 |
| 2 | A hybrid tubular standing support for underground mines:Compressive behaviour显示文摘This paper presents the development of an innovative standing support for underground mines.The main feature of this standing support is its exterior container,a combination of polyvinyl chloride(PVC)with large rupture strain and fibre-reinforced polymer(FRP)with high strength-to-weight ratio.To demonstrate the advantages of this cementitious grout filled PVC-FRP tubular(PFT)standing support,a series of compression tests were conducted.Test variables included the strength of cementitious grout infill material and the thickness of FRP jacket.Compression tests were also conducted on cementitious grout-filled PVC tubular(PT)support and cementitious grout-filled FRP tubular(FT)support.These tests showed that PFT support presents a typical strain-hardening behaviour together with an outstanding axial deformation ability(>20%of the overall height of the support).In addition,the maximum compressive strength of PFT support is much higher than that of the corresponding PT support and FT support.Furthermore,using thicker FRP jacket or high strength cementitious grout material can enhance the load carrying capacity of PFT support.These comparative results indicated that the high performance of PFT support is mainly attributed to the combination of confining constituents(i.e.PVC and FRP)and infill material. | Hongchao Zhao Ting Ren Alex Remennikov | 2021 | International Journal of Mining Science and Technology2021，31，2： | 1 |
| 3 | Utilising the scientific method to demonstrate that slender beam/column behaviour is the dominant behavioural mechanism leading to roof/rib failure显示文摘As per most other earth science engineering problems,the underground coal geotechnical environment and the way in which roof and rib support interacts with the rock mass are complex issues.It is therefore generally recognised that without prudent simplification,the complexity of the problem will overwhelm all current geotechnical methods of modelling,not least for the reason that a rock mass can never be characterised to a level that allows a'non-simplified'analysis.The fact that numerical models,which are commonly purported to be a'simulation'tool and the so-called epitome of advanced geotechnical engineering,always need to be'calibrated'to a known reality is taken to be conclusive proof of this statement.While the problem should not be oversimplified(i.e.the dominant failure mechanisms or critical data input parameters should not be ignored),without question judicious simplification is at the heart of all engineering design,to the point that it has a well-established name–'reductionism'.The hypothesis addressed in this paper,is that horizontal and vertical stress-driven slender beam and column behaviour(which includes unstable Euler Buckling)are respectively the dominant(but not only)roadway roof and ribline behavioural mechanism that(if not controlled)can lead to excessive deformation,failure and eventual collapse.As a part of the Scientific Method,a hypothesis can only be tested via real-world observations,measurements and analyses in establishing it is a credible Theory.Utilising the Scientific Method,this paper demonstrates that slender beam/column behaviour is the dominant instability mechanism within a coal mine roof/rib subject to elevated horizontal/vertical stress conditions and therefore,must be representatively accounted for in any credible empirical,analytical,or numerical approach to coal mine roof/rib stability assessment and associated ground support design. | Mark Colwell Russell Frith | 2021 | International Journal of Mining Science and Technology2021，31，5： | 1 |
| 4 | 黄河流域陕西段典型煤矿区生态环境承载力分析显示文摘为研究陕西省黄河流域煤矿区生态环境承载力的整体状况,首先对生态环境承载力概念和内涵进行了明确;其次结合陕西省黄河流域大型煤矿区特征,从经济、社会、资源环境等方面,搭建生态环境承载力评估指标体系;最后结合层次分析法和AcrGIS(Geographic Information System)重分类法,对铜川、蒲白、澄合、韩城、焦坪、黄陵、神府7个煤矿区生态环境承载力进行评分分级。结果显示,铜川煤矿区和韩城煤矿区的生态环境承载力等级为优秀,分值达到0.75以上;黄陵煤矿区和神府煤矿区生态环境承载力表现较差,分值在0.25以下。陕西省黄河流域煤矿区的生态环境承载力受地理位置影响,差异较大。研究对陕西省煤矿区生态环境承载力的发展提供了参考。 | 王丽 | 2023 | 能源与环保2023，45，9： | 0 |
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