地下导控气化采煤地面变形实测研究.docVIP

 地下导控气化采煤地面变形实测研究# 鞠远江1，师修昌1，王作棠2* （1. 中国矿业大学资源与地球科学学院，江苏 徐州 221116； 5 10 15 20 25 30 35 40 2. 中国矿业大学 矿业工程学院，江苏 徐州 221116） 摘要：为华亭煤业集团安口矿地下导控气化试采工作面设计了地表变形观测站，设计倾向、 走向测线各一条，在先期测量的基础上，于工作面点燃后，对所有测点进行 x、y、z 坐标的 连续观测，共获得 12 组数据。为确定地下导控气化工作面地表变形的危险范围，计算各测 点倾斜、曲率、水平变形三个变形量参数，发现不同于传统采煤工作面自开采后地表“下沉 -稳定”的两阶段变形规律，气化工作面的地表变形过程可明显划分为“上升-下沉-上升- 下沉-稳定”五个阶段，对各阶段变形原因进行了分析，认为工作面燃烧热量使岩层热胀冷 缩，从而使上覆岩层产生“塑性-弹性-断裂”的变化过程，反映在地面变形上即是：第一阶 段，热胀使岩层塑性增强，地面上升；第二阶段，燃空使上覆岩层塑性弯曲下沉；第三阶段， 冷却使岩层弹性增强，收缩过程中岩层之间产生离层，地表表现为上升；第四阶段和第五阶 段，完全冷却后顶板岩层断裂，引起地面下沉并趋于稳定。 关键词：气化采煤；地面变形；五阶段变形规律 中图分类号：TD325 Study on surface deformation laws over underground gasification face Ju Yuanjiang1, Shi Xiuchang1, Wang Zuotang2 (1. school of Resource and Earth Science China University of Ming Technology, JiangSu XuZhou 221116; 2. School of Mines China University of Mining Technology, JiangSu XuZhou 221116) Abstract: Devised a deformation observation station for undergroud coal gasification face in AnKou mine Huating coal group. Analysied the 12 sets data of the measure points and calculated the boundary angles of ground subsidence basin in both trend and oblique direction, calculated the tilt, curvature and horizontal deformation parameters of all the points. Based on the monthly observation data ploted the subsidence process after igniting the gasification face of all of the points, found that the surface deformation of gasification face follows a five-stage pattern （rising-sinking-rising-sinking-stable) ，which was different from the traditional coalface mining pattern (sinking-stable). Concluded that the overlying rocks expanding and contracting is the main cause: The first stage, the rocks thermal expansion resulted in the surface rising; The seccond stage, overlying rocks with thermoplasticity curving to the burn-out area resulted in the surface sinking; The third stage, overlying rocks cooled and shrinked, abscission zone occurred, shallow rocks rising resulted in the surface rising; The fourth and fifth stages, roo