条带煤柱膏体充填开采覆岩模型及运动规律1114.doc

(条带煤柱膏体充填开采覆岩结构模型及运动规律 陈绍杰1,2，郭惟嘉1，周辉2，温国惠3 （1. 山东科技大学 矿山灾害预防控制国家重点实验室，青岛 266510；2.中国科学院武汉岩土力学研究所 岩土力学与工程国家重点试验室。工作面的直接即为老顶初次来压步距33.6m，前4次周期来压步距分别为18.3m、8.8m、13.7m、9m。工作面周围采空区覆岩垮落后已经基本稳定，护巷煤柱上方的顶板和覆岩已在相邻采空区稳定过程中开裂，覆岩重力作用在工作面前方煤壁和采空区的充填膏体上，顶板超前应力和影响范围较小，主要影响范围小于15m。来压步距Control, Qingdao 266510, China； 2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071,China; 3. Daizhuang Coalmine,Zibo Mining Group Co.Ltd.,Jining,Shandong 272175,China) Abstract: Space-time structure model and movement law of overburden are researched during strip pillar mining backfill with cream-body, taking 2351 backfilling face for an example. As the face advances, overburden strata is gradually transformed from the C type space structure into articulated rock beam with unequal height supports. The immediate roof of working face is the main roof, consisted of siltstones with a thickness of 1.55m and fine sandstone with a thickness of 1.3m; the first weighting interval is 33.6m, and the periodic weighting length respectively are 18.3m, 8.8m, 13.7m and 9m for the last four times. The gob around face had been basically stable after overburden collapsed, and the roof and overburden strata above protective pillar has been cracked in the stable process of adjacent gob.The overburden gravity mainly acted on coal wall in front of face and backfill paste in the gob, which had little effect on roof advance stress, and the influence scope was less than 15m. In current technology conditions of face 2351, the reasonably maximal roof control distance was 8.8m, the reasonable working resistance of support backfilling is 27Mpa, and the support setting load is 21Mpa. Keywords: strip pillar; backfill mining; overburden strata movement; structure model; cracking；roof weighting step 条带开采法以条带煤柱形式支撑上覆岩层，减少覆岩下沉、控制地表移动，保护地表建（构）筑物[1-2]。随着社会经济的迅速发展，建（构）筑物下的条带煤柱也越来越多。为了更多地回收资源，我国学者已经开展了充填开采的系列研究[2-8]。岱庄煤矿位于济宁市北郊，地面建（构）筑物多，压覆煤炭占