采矿专业毕业设计外文资料翻译--千万吨级矿井综采工作面的开采工艺性评价

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 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 function

1 INTRODUCTION

With 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 GEOLOGY

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 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 EV ALUATION

3.1 STRUCTURE OF EV ALUATION FACTORS

According 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 q1﹑fault length exponent q2﹑fault fall exponent q3﹑variation of coal seam and band coefficient γ﹑seam thickness m﹑seam angle α﹑seam hardness R﹑immediate roof hardnessσ﹑ratio of immediate roof and seam mining thickness N﹑false roof thickness h0﹑immediate bottom hardness q c﹑coal face length l and coal face advance length s.

Figure 3-1 structure of evaluation factors of coal face

3.2 INDEX SYSTEM OF EV ALUATION

Explanation 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；