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Based on the field measurements of No. 8027 longwall face of Wangcun Coal Mine, this paper attempts to give a description of the planar FEM study of the basic strata behaviors of the hard roof after injecting pressured water prior to mining for induced caving. The study reveals that after the pre-injection of the pressured water the load on the powered face supports and the peak in-situ stress of the rock mass have been reduced remarkably and the face support performance has been improved effectively. These...

Based on the field measurements of No. 8027 longwall face of Wangcun Coal Mine, this paper attempts to give a description of the planar FEM study of the basic strata behaviors of the hard roof after injecting pressured water prior to mining for induced caving. The study reveals that after the pre-injection of the pressured water the load on the powered face supports and the peak in-situ stress of the rock mass have been reduced remarkably and the face support performance has been improved effectively. These indicate that the method of induced caving of hard roof by pressured water pre-injection is effective to tackle the problem of the hard roof strata control.The study also shows that the height of the fractured zone is closely related to the caving height of the roof in the goaf, while the rational height of the pre-injection of pressured water must be approximately the same as that of the caving height of the roof to be caved in the goaf. The strength of the elastic energy accumulated in the coal seam is reduced after the pre-injection of the pressured water, therefore the method can also be used as an effective measure for the prevention of the rockbursts.

本文以王村矿8207工作面坚硬顶板预注压力水试验的实测资料为基础,通过平面有限元分析,探讨了顶板注水后工作面矿压显现的特点。研究表明,顶板注水后,支架载荷、岩体应力峰值都有明显降低,对改善工作面支护状况有显著的效果,是控制坚硬顶板的有效技术途径;顶板破坏区的高度与老塘冒落高度有密切的关系,合理的注水高度应与老塘已有的冒高接近;顶板注水后使煤层弹性能量积聚程度减弱,可作为防治冲击地压的有效措施之一。

According to the difficult problems affacting the development of comprehensivemining work face, the breaking-rock roller is successfullydeveloped for cutting collapsing column. The key problems ofthe roller are analyzed, such as forced pick, load and cuttingparameters,etc.,and determining the main technical parameters of the roller in this paper. An effective technical way issuggested for solving collapsing column problems in comprehensive mining face.

针对陷落柱影响综采工作面推进的技术难题,研制成功了截割陷落柱的破岩滚筒。分析了破岩滚筒的截齿受力、载荷和切削制度参数等关键问题,确定了破岩滚筒的主要技术参数,为处理综采工作面中的陷落柱提供了一种有效的技术途径.

Have compared among three kind of technical ways about increasing the rate of filter and decreasing moisture of product according to filter theories in this paper;focus on dissertatng the mechanisms of the heat press filter and its effects;introduced the constructions and the system compositions of applying apparatuses in the heat press filter industry,and regarded the heat press filter as the most efficient technical way presently to decrease...

Have compared among three kind of technical ways about increasing the rate of filter and decreasing moisture of product according to filter theories in this paper;focus on dissertatng the mechanisms of the heat press filter and its effects;introduced the constructions and the system compositions of applying apparatuses in the heat press filter industry,and regarded the heat press filter as the most efficient technical way presently to decrease the moisture of the grain mineral products;the heat press filter apparatus is a installation that is not only good in practicality but also saving in invest,and is applied to the problems with the prain mineral dehydration.

根据过滤理论 ,对提高过滤速率 ,降低产品水分的三种技术途径进行了比较 ;重点论述了热压过滤的机理、效果 ;介绍了热压过滤工业应用装置的结构和系统构成 ,认为热压过滤是目前降低细料矿物产品水分最有效的技术途径 ;该热压过滤装置是实用性强 ,投资省的设施 ,适用于有关现场解决细粒矿物脱水的难题。

 
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