采礦外文翻譯---長(zhǎng)壁采煤法回采巷道三向交叉點(diǎn)的三維有限元分析

1、英文原文Finite element analysis of three-way roadway junctions in longwall miningR.N. Singh, I. Porter, J. HematianFaculty of Engineering, UniÍersity of Wollongong, Northfields Avenue, Wollongong, NSW 2522, AustraliaAb

2、stract:This paper presents a three-dimensional finite element analysis of three-way roadway intersections in longwall mining, and assesses the stable/unstable behaviour of three-way intersections under a range of loading

3、 conditions. Loads were applied to the model by means of uniform stresses on the internal free faces. This method of loading the model from the inside helped to reduce its size and to eliminate the boundary effects. Stre

4、ss concentrations and displacement results on the mid-height of the pillars, roof and floor strata adjacent to the three-way intersections and cut-throughs were calculated.Based on this study, guidelines for designing th

5、e support system for three-way intersections are suggested. The results were validated by a case study of a three-way intersection in an underground coal mine in the southern coal fields of the Sydney Basin. Keywords:und

6、erground coal mining; gate roadway; intersections; stability; finite element method1. IntroductionA trend exists in Australia for installing high productivity longwall faces producing 3.0~4.0 milliontonne raw coal per an

7、num per face. The mainconcern for the success of the high-production longwallfaces is to achieve high rates of developmentand to maintain stability of access roadways andtheir intersections during the life span of the fa

8、ce.Intersections are formed when the pillars betweenthe two roadways are intersected by driving a crosscut. Roadway intersections in underground mines areparticularly susceptible to ground control problemsdue to inherent

9、ly wide roof spans used and the difficulty in installing roof supports promptly inhighly mechanised headings. Stresses induced duringintersection formation may result in high incidenceof roof and rib failures. Despite ma

10、ny investigationsinto the stability of gate roadways intersectionsadverse conditionssuch as high horizontal stress and unsteady state ofabutment pressure from moving longwall faces maycause instability of gate roadway in

11、tersections.For example in 1985; major strata control problems inthe main gate of no. 6 longwall panel at WestcliffColliery resulted in roof fall, which stopped coalproduction for a period of 6 weeks. Similarly, a rooffa

12、ilure incident at Pacific Colliery caused the longwallequipment to be buried resulting in Fig. 1. Plan and section of the finite element three-dimensional intersection modelTable 1 Rock properties assigned to

13、three-way intersection modelsRock type Thickness /m E /GPa νMedium grain sandstone 4.0 10.0 0.20Fine sandstone and mudstone 3.0 6.0 0.25Coarse sandstone and shale 2.0 3.0 0.20Top coal 1.0 3.5 0.3Coal 3.0 3.5 0.3Mudstone

14、1.0 8.0 0.25Coarse sandstone 4.0 12.5 0.2Medium grain sandstone 5.0 10.0 0.2model by means ofuniform pressures on the internal free faces. Thistechnique of applying load from the inside helped to reduce the size of the m

15、odel and to eliminate boundaryeffects. For all the loading configurations depictedin Table 2, a linear solution method was used.Table 2 Loading conditions applied to the three-dimensional modelLoading configurat