小保当煤矿首采区三维地质特征研究

Study on three-dimensional geological characteristics of the first mining area in Xiaobaodang Mine

地质构造的复杂多变性严重制约了现场的生产,传统地质勘探难以实现全方位勘察,结果存在较大误差,难以满足实际生产需求。针对以上问题,本文选取陕北小保当一号井首采区为研究背景,采用三维地震勘探的方法对采区断层地质构造和上覆岩土覆盖层厚度变化趋势开展勘探作业。勘探研究表明,小保当一号井首采区共发现9条断层,均为正断层,其中2^(-2)煤层分布2条断层,5^(-2)煤层分布7条断层,断层落差相对较小;2-2煤上覆岩土覆盖层厚度为50~115 m,勘探区覆盖层厚度由东北向西南逐渐变厚,最大厚度为115 m。在开采该区西南部时,应选取较大工作阻力支架,采区东北区域开采时,加强矿井涌水量和漏风等问题的监管,对突发灾害开展防治工作。

The complexity and variability of geological structure seriously restricted the production of the site.The traditional geological exploration was difficult to achieve all-round investigation,and the results had large errors,which was difficult to meet the actual production needs.In view of the above problems,this paper selected the first mining area of Xiaobaodang No.1 well in northern Shaanxi as the research background,and used the method of three-dimensional seismic exploration to carry out exploration operations on the fault geological structure of the mining area and the thickness change trend of the overlying rock and soil overburden.The exploration research showed that 9 faults were found in the first mining area of Xiaobaodang No.1 well,all of which were normal faults.Among them,2 faults were distributed in No.2^(-2) coal seam,7 faults were distributed in No.5^(-2)coal seam,and the fault drop was relatively small.The thickness of overburden rock and soil on No.2^(-2) coal was 50-115 m.The thickness of overburden in exploration area gradually becomed thicker from northeast to southwest,and the maximum thickness was 115 m.When mining the southwest of the area,a large working resistance support should be selected.When mining in the northeast of the mining area,the supervision of mine water inflow and air leakage should be strengthened to prevent and control sudden disasters.