外文翻译-千万吨级矿井综采工作面的开采工艺性评价

翻译部分英文原文Fuzzy evaluation on coal seam geological condition of coal face in ten million ton MineAbstract：Based on coal seam geological condition in Jisan Mine，quantitative evaluation on concrete coal seam geological condition is made by using fuzzy evaluation with the view of coal mining and coal face production.The evaluation content and its realization of coal seam geological condition，the structure and the index system of evaluation factor，the membership functions and weights of evaluation factor ，evaluation model and reliability are expounded in detail ，eighty-two coal face that will be exploited is classified，Fuzzy evaluation is the basal work to select coal mining technology and ensure a ming running efficiently，safely and steadily.Key words：fuzzy evaluation；membership function1 INTRODUCTIONWith the development of mining ，the difference of coal seam geological conditions will affect the suitability of coal mining technology and coal face outputs ，i.e. qualification and economic indicator.To ensure a mining running efficiently，safely and steadily ，coal seam geological conditions must be known roundly and detailed .Fuzzy evaluation on coal seam geological conditions is a evaluation on concrete coal seam geological condition with the comprehensive view of coal mining. The main characteristic of evaluation is that a coal face is a evaluation cell.The aticle tells of fuzzy evaluation on coal seam geological conditions in Jisan Mine.2 CONDITIONS OF SEAM AND GEOLOGYThere are three sections that are exploited in Jisan Mine， i.e. north sectioneast sectionwest section，they belongs to Sanxia coal seam. Sanxia coal seam is at the bottom of Shanxizu， mean thickness of coal seam is 5.26 metres，from east to west in Mine， thickness of coal seam reduce from 5 metres to 3.5 metre. Rock character of roof is sandrock or siltite， rock character of bottom is siltite or thin sandrock. There are many faults in Jisan Mine，there are fourteen faults that their drops are bigger than twenty metres， and there are many smaller faults. Based on the coal seam geological conditions，strike longwall mining method in fully mechanized coalface is adopted.3 FACTORS AND INDEX OF EVALUATION3.1 STRUCTURE OF EVALUATION FACTORSAccording to the principle of system， feasibility and simplicity， based on coal seam geological characteristic ，the structure of evaluation factors is figure 3.1.It consists of seven compound factors and eleven smaller factors， these factors are quantified by fault density q1fault length exponent q2fault fall exponent q3variation of coal seam and band coefficient seam thickness mseam angle seam hardness Rimmediate roof hardnessratio of immediate roof and seam mining thickness Nfalse roof thickness h0immediate bottom hardness qccoal face length l and coal face advance lengths.Fault effectC1Variabi-lity ofSeam thicken-ssC2Seam thickessC3Seam angle C4Seam hardnessC5Imm-ediate roof hard-nessC6Main roof hold-ing pow-er C7False roof hardnessC8Bot-tom hardnessC9Coal face leng-thC10Coal face adve-nceC11Complex degree of geologic structureB1Seam stabilityB2Seam thicknessB3Seam angleB4Seam haren-essB5Seam roof and bottom conditionB6Coal faceB7Evaluation on coal seam geological conditions of coal face A Figure 3-1 structure of evaluation factors of coal face3.2 INDEX SYSTEM OF EVALUATIONExplanation of eleven smaller evaluation factors is as follows：(1) fault effect： describing fault effect on mining needs three index， fault density-fault number in unit area； fault length-sum of fault length in unit area； fault fall exponent-ratio of fault fall and seam thickness.(2) variation of coal seam and band coefficient： ratio of seam thickness sample standard deviation and seam thickness mean.(3) Seam thickness： seam sample thickness mean.(4) Seam angle： seam sample angle mean.(5) Seam hardness： seam compression strength.(6) Immediate roof hardness： immediate roof compression strength.(7) Main roof holding power：(8) False roof effect： false roof thickness.(9) Immediate bottom hardness： immediate roof compression strength.(10) Coal face length(11) Coal face advance 3.3 MEMBERSHIP FUNCTIONS OF EVALUATION FACTORSThe membership function of evaluation factor is the quantitative description on fuzzy relationship between the change of a geological factor and the mining effect. Membership function is the foundation to build a fuzzy evaluation model.Adopting statistic analogism method， method of undetermined coefficients and heterogeneous fuzzy statistic method， membership functions are obtained as follows：（1）membership function of fault effecta=2/ （1+exp（0.0018+0.042q1+0.064q2+0.00071q3）（2）membership function of variation of coal seam and band coefficient（3）membership function of seam thickness（4）membership function of seam angle（5）membership function of seam hardness（6）membership function of immediate roof hardness（7）main roof holding power（8）false roof effect（9）immediate bottom hardness（10）coal face length（11）coal advance length3.4 WEIGHTS OF EVALUATION FACTORSWeight of evaluation factors is a quantity that show relative importance of per factor in system，it is the key to unify systemic structure and function.Coam seam geological evaluation of coal face ascertains weights of evaluation factors by AHP.AHP is a easy method to quantify the quanlitative event.Appliacation of AHP needs five steps：building hierarchical model、constructing judgement matrix、single hierarchy collation and consistency check、total hierarchy collation 、consistency check of total hierarchy collation.Comfirmatiom of judgement matrix is the key to use AHP，value of judgement matrix is the quantitative description on relative importance of per factor，the valves are one to nine and their reciprocals.Table1 shows the value，Table2 to 4 show judgement matrix，Table5 shows weights of evaluation factors.Figure 1 gradation and explanation of judgement matrixgradationexplanation1The same importance of 2 element3One element is little more important than another5One element is obviously more important than another7One element is mightly more important than another9One element is extremely more important than another2，4，6，8mid vlavereciprocalReciprocal valveFigure 2 AB judgement matrixAB1B2B3B4B5B6B7B11657877B21/6133332B31/51/313343B41/71/31/31333B51/81/31/31/3122B61/71/41/31/31/213B71/71/31/31/31/21/31Figure 3 B6C judgement matrixB6C6C7C8C9C61323C71/3123C81/21/313C91/31/31/31Figure 4 B7C judgement matrixB7C10C11C1013C111/31Figure5 calculation result of factor weightCompound factor weightSmaller factor plex degree of geological structure0.4898Fault effect0.48982.stabilization degree of coal seam0.1557Variability of coal seam0.15573. seam thickness0.1289Seam thickness0.12894.seam angle0.0861Seam angle0.08615.seam hardness0.055Seam hardness0.0556.seam roof and bottom condition0.0468Immediate roof hardness0.0209Roof holding power0.012False roof0.0094Bottom effect0.00447.coal face 0.0377（1） Coal face length（2） Coal face advence0.02830.0094sum1.0sum1.03.5 FUZZY EVALUATION MODELCoal seam geological conditions are multilayered evaluated by fuzzy evaluation model， fuzzy evaluation model images single factor evaluation value to total evaluation value by certain algorithm，whether propertis of evaluation sample is bad or good are assured by total evaluation valve，in order to comprehesively consider effect degree of per factor，weighted avarage evaluation model is used，the model：In fomula：bjevaluation valve；Wiweight matrix。3.6 RELIABILITY OF FUZZY EVALUATION Because coal seam geological conditions are not accurately descripted ，evaluation on drill information has some aberrations，the ratio of pre-mining evaluation valve and after-mining evaluation valve in the same coal face is the index valve to judge pre-mining evaluation reliability of coal seam.I.e.evaluation reliability of coal face j is pj，then in formula：bj（1）after-mining evaluation valve of coal seam j； bj（2）pre-mining evaluation valve of coal seam j；pre-mining evaluation valve of unquarried coal seam is amended by pj.Table6 is evaluation reliability of several section coal face in Jisan Mine.Table6 evaluation r