固体充填开采合理井筒保护煤柱留设尺寸研究

发布时间：2018-09-04 05:35

【摘要】：随着煤炭资源的不断开发,在我国中东部地区部分老矿井可采资源储量日益缩减,矿井进入残采阶段,工广煤柱在此阶段具有极高的开采价值。开采工广煤柱时为了保证矿井生产系统的正常运行,需留设一定范围的井筒保护煤柱保证井筒免受采动破坏。本文针对固体充填开采工广煤柱期间井筒保护煤柱的留设尺寸问题,研究了三种井筒保护煤柱留设模型,提出了固体充填开采工广煤柱时井筒保护煤柱留设尺寸设计流程。文章首先对工广煤柱开采过程中影响井筒变形破坏的因素进行了分析研究,得出影响井筒变形破坏的主控因素;其次采取理论分析、数值计算、回归分析等研究方法,研究了不同影响因素条件下固体充填开采工广煤柱井筒变形破坏规律,得出了固体充填开采工广煤柱时井筒受到最大轴向应力预计公式,分别提出了基于理论分析和基于数值模拟的井筒保护煤柱留设模型;综合以上井筒保护煤柱留设模型,提出了固体充填开采合理井筒保护煤柱留设尺寸设计流程。最后以百善煤矿为例,设计了井筒保护煤柱的留设尺寸,在此基础上设计了工广煤柱区域充填开采方案,并通过概率积分法预计了井筒变形。论文取得了以下主要成果:(1)根据百善煤矿675地表移动观测站和“三带”观测孔的数据,选取了垂直剖面法留设井筒保护煤柱参数,对百善煤矿井筒保护煤柱留设尺寸进行了设计,设计的井筒保护煤柱边界呈椭圆形,长半轴205m,短半轴190m,所圈定的面积为126797.4m2,压煤量为54.9万t,占工广煤柱压煤量的25%。(2)通过对现有文献归纳总结,对井筒变形影响因素进行了研究,提出充实率和井筒保护煤柱半径为固体充填开采条件下影响井筒变形破坏的主控因素,指出保证井筒稳定,控制井筒最大轴向应力是固体充填开采井筒保护煤柱尺寸设计关键,井筒变形破坏判断标准为s()￡[s]cz。应用高斯影响函数,根据“等价采高”理论,对固体充填开采情况下,井筒变形与充实率和井筒保护煤柱半径的关系进行研究,得出井筒最大轴向应力预计公式,提出了基于理论分析的井筒保护煤柱留设模型。(3)采用ABAQUS三维有限元数值分析软件,研究了固体充填开采工广煤柱井筒变形破坏规律:最大轴向应力与充实率负相关,当煤柱开采半径为132m时,合理的充实率不得低于50%;最大轴向应力与井筒保护煤柱半径负相关,当充实率为80%时,合理的煤柱半径应大于110m。根据数值模拟研究结果,回归得出井筒最大轴向应力预计公式,提出了基于数值模拟的井筒保护煤柱留设模型。(4)综合垂直剖面法、力学分析、数值模拟三种井筒保护留设模型,提出了固体充填开采工广煤柱时井筒保护煤柱留设尺寸的设计流程,并以百善煤矿为例,设计了井筒保护煤柱的留设尺寸,并采用surfer地图分析软件绘制工广煤柱区域充实率控制指标,生产过程中当前区域充实率不得低于该指标。完成试验矿井工广煤柱区域工作面布置,并根据概率积分法对该设计进行了井筒变形破坏预计,进一步对井筒保护煤柱留设尺寸进行修正。
[Abstract]:With the continuous development of coal resources, the reserves of mineable resources in some old mines in the central and eastern part of China are decreasing day by day, and the mines are entering the residual mining stage. Gongguang coal pillar has a very high mining value at this stage. Aiming at the problem of setting dimension of protective coal pillar during the mining of Guangzhou coal pillar with solid filling, three kinds of protective coal pillar setting models are studied, and the design flow of setting dimension of protective coal pillar in the mining of Guangzhou coal pillar with solid filling is put forward. Secondly, by means of theoretical analysis, numerical calculation, regression analysis and other research methods, the deformation and failure regularity of coal pillar in solid backfill mining is studied under different conditions, and the shaft is subjected to solid backfill mining. The formulas for predicting the maximum axial stress are presented, and the models for setting coal pillars in wellbore protection based on theoretical analysis and numerical simulation are put forward respectively. On the basis of setting dimensions, the paper designs a regional filling mining scheme of Gongguang coal pillar, and predicts the shaft deformation by probability integral method. The main results are as follows: (1) According to the data of 675 surface movement observation station and "three zones" observation hole in Baishan Coal Mine, the parameters of protecting coal pillar in vertical section method are selected for Baishan Coal Mine. The dimension of protective coal pillar in mine shaft is designed. The boundary of protective coal pillar in mine shaft is elliptical, 205m long and 190m short. The area delineated is 126797.4m2 and the coal pressure is 549,000 t, which accounts for 25% of the coal pressure in Gongguang coal pillar. (2) Through summarizing the existing literature, the influencing factors of shaft deformation are studied and the enrichment is put forward. The ratio and the radius of the protective pillar are the main controlling factors affecting the deformation and failure of the wellbore under the condition of solid backfill mining. It is pointed out that ensuring the stability of the wellbore and controlling the maximum axial stress of the wellbore are the key to the design of the size of the protective pillar in solid backfill mining. The criterion for judging the deformation and failure of the wellbore is s()[s] cz. Based on the theory of mining height, this paper studies the relationship between shaft deformation and filling ratio and the radius of protective coal pillar under the condition of solid filling mining, obtains the prediction formula of the maximum axial stress of shaft, and puts forward the retaining model of protective coal pillar in shaft based on theoretical analysis. (3) Using ABAQUS three-dimensional finite element numerical analysis software, the opening of solid filling is studied. Deformation and failure law of mining wide coal pillar wellbore: the maximum axial stress is negatively correlated with the filling rate, when the radius of pillar mining is 132m, the reasonable filling rate should not be less than 50%; the maximum axial stress is negatively correlated with the radius of protective pillar, and when the filling rate is 80%, the reasonable radius of pillar should be greater than 110m. The formulas for predicting the maximum axial stress in the shaft are given, and a model for setting the protective coal pillar in the shaft based on numerical simulation is proposed. (4) Based on the vertical section method, mechanical analysis and numerical simulation of three protective coal pillar laying models, the design process of setting the protective coal pillar in the wide coal pillar with solid filling is proposed. The reserved dimension of protective coal pillar is calculated and the control index of regional filling rate of Gongguang coal pillar is drawn by using surfer map analysis software. The current regional filling rate should not be lower than this index in the production process. Further, the size of shaft protection pillar should be amended.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TD822.3

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