下分层综放工作面上覆岩层结构特征  

Character of Overlying Strata Structure for Fully Mechanized Coal Face with Sublevel Caving in Lower-slicing

作　　者：田昌盛[1] 白占芳[2] 翟新献[1] 

机构地区：[1]河南理工大学能源科学与工程学院 [2]焦作煤业集团方庄矿有限责任公司,河南焦作454361

出　　处：《河南理工大学学报（自然科学版）》2006年第3期191-195,共5页Journal of Henan Polytechnic University（Natural Science）

基　　金：河南省自然科学基金资助项目(0511051900)

摘　　要：我国综放开采技术是在分层综采技术的基础上发展起来的,对于一直采用分层综采的一些大型厚煤层生产矿井,面临着顶分层采后下分层综放开采技术问题,这个问题与一次采全厚整层综放开采矿压显现有所不同.下分层综放开采时,二次垮落的直接顶岩层碎胀系数较小,垮落带高度与采高的比值将增加,造成顶分层开采时下位老顶岩层垮落后转化为规则垮落带,成为下分层综放工作面的上位直接顶,促使下分层综放工作面的老顶“砌体梁”式平衡结构向更高层位岩层发展.上位直接顶岩块强度较高、块度较大,容易形成“岩-矸”半拱式平衡结构.该结构的周期性失稳和垮落,造成采场出现小的周期来压现象;而“砌体梁”平衡结构的周期性失稳和垮落,将导致采场出现大的周期来压现象.Based on fully mechanized mining in slicing, fully mechanized mining with sublevel caving or FMMSC has been developed. With fully mechanized mining in slicing, some large-production coal mines are confronted with problems of FMMSC in lower＇slicing while top-slicing of thick seam has been excavated. Behaviors of ground pressure of FMMSC in lower-slicing have some different from that in whole-seam. Owing to expansion factor of re-caving roof-strata being smaller while lower＇slicing seam is excavated with FMMSC, the ratio of caved zone height to mining height will increased. Former Basic roof-stratum while top-slicing seam was excavated, has being translated into caved zone and has become upper-immediate roof stratum. So, it is the equilibrium structure with stacked layer of blocks in basic roof with FMMSC in lower-slicing that moves into a higher stratum. Since lump size of upper-immediate roof is large, a semi-arch equilibrium structure of the stratum-rock sometimes can be formed. Periodic destabilization and caving of the structure will lead to a small periodic weighting in coal face. While destabilization and caving of the equilibrium structure with stacked layer of blocks will cause of large periodic weighting.

关 键 词：厚煤层 综放工作面 下分层 平衡结构 

分 类 号：TD32[矿业工程—矿井建设]