1、英文原文 Fuzzy evaluation on coal seam geological condition of coal face in ten million ton Mine Abstract： 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 fac
2、e 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
3、 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 function 1 INTRODUCTION With the development of mining ， the difference of coal seam geological conditions
4、 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 condition
5、s 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 GEO
6、LOGY There are three sections that are exploited in Jisan Mine， i.e. north section east section west 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 m
7、etres 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
8、 conditions， strike longwall mining method in fully mechanized coalface is adopted. 3 FACTORS AND INDEX OF EVALUATION 3.1 STRUCTURE OF EVALUATION FACTORS According to the principle of system， feasibility and simplicity， based on coal seam geological characteristic ， the structure of evaluation facto
9、rs is figure 3.1. It consists of seven compound factors and eleven smaller factors， these factors are quantified by fault density q1 fault length exponent q2 fault fall exponent q3variation of coal seam and band coefficient seam thickness m seam angle seam hardness R immediate roof hardness ratio of
10、 immediate roof and seam mining thickness N false roof thickness h0 immediate bottom hardness qc coal face length l and coal face advance lengths. Figure 3-1 structure of evaluation factors of coal face 3.2 INDEX SYSTEM OF EVALUATION Explanation of eleven smaller evaluation factors is as follows： (1
11、) 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 effect C1 Variabi-lity of Seam thicken-ss C2 Seam thickess C3 Seam angle C4 Seam hardness C5 Imm-ediate roof hard-ness C6 Main roof hold-i
12、ng pow-er C7 False roof hardness C8 Bot-tom hardnessC9 Coal face leng-th C10 Coal face adve-nce C11 Complex degree of geologic structure B1 Seam stability B2 Seam thickness B3 Seam angleB4 Seam haren-ess B5 Seam roof and bottom condition B6 Coal face B7 Evaluation on coal seam geological conditions
13、of coal face A 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 hard
14、ness： 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
15、 FUNCTIONS OF EVALUATION FACTORS The 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 m
16、ethod， method of undetermined coefficients and heterogeneous fuzzy statistic method， membership functions are obtained as follows： （ 1） membership function of fault effect a=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 5.01.05.02.06.132.00.1)(000000hhhhhh （ 4） membership function of seam angle 3N1 . 03N0 . 31 . 8 + N) E x p ( - 0 . 2 9 1 . 9-0 . 3N0 . 0 5( N ) N （ 5） membership function of seam hardness 0 . 1 7 . 2( ) 0 . 5 1 l n 0 . 9 1 7 . 2 4 21 . 0 4 2ccR c c ccRR R RR
