摘要
为分析遗留下分层开采时再生顶板的运动规律及矿压显现特征,以北皂煤矿油页岩分层下行开采为背景,结合前期研究中建立的下分层再生顶板碎裂结构模型及其分带特征,通过改进传统的相似材料配比构建了下分层再生顶板碎裂结构相似材料试验模型,并对下分层开采中的顶板运动、支承压力分布及支架受力特点进行了研究.结果表明:受二次采动影响,再生顶板垮落岩块碎胀系数较小,压实程度较好.上、下分层采高接近情况下,下分层工作面支承压力影响范围及峰值均小于上分层,分别为上分层的38%和51%;下分层支架受力为上分层的91.6%;下分层采出后顶板中不规则冒落带及规则冒落带高度均增加至采前的3倍;裂隙带高度增加为采前的1.6倍.为类似条件的下分层采场设计、支架选型提供依据.
To analyze the movement rule and pressure behavior of regenerated roof when mining the remaining lower slice of oil shale,on the background of downward mining oil shale slices in Beizao coal mine,combined with the regenerated roof model built in preliminary work which has cataclastic structure and zoning features,a similar material model of regenerated roof was constructed through improving the traditional material ratio.The characteristics of roof movement,abutment pressure distribution and support stress were studied.The results indicate that the falling rocks of regenerated roof has small crushing expansion coefficient and better compaction.Under situation of the same mining height of the upper and lower slices,both the influence sphere and peak value of lower slice are less than upper slice,which account for 38% and 51% of the upper slice mining,respectively.The support stress of lower slice accounts for 91.6% of upper slice.After the mining of lower slice,both the irregular and regular caving zone height of regenerated roof increase treble over the upper slice mining,and fissure zone height increases about 1.6 times.The results provide some scientific proof for mining design and selection of hydraulic support in similar conditions.
作者
马文强
MA Wenqiang(College of Architecture and Civil Engineering,Xinyang Normal University,Xinyang 464000,China)
出处
《信阳师范学院学报（自然科学版）》
CAS
北大核心
2019年第3期498-504,共7页
Journal of Xinyang Normal University(Natural Science Edition)
基金
国家自然科学基金项目(41807240)
河南省科技攻关项目(182102310786)
信阳师范学院“南湖学者”奖励计划资助
关键词
遗留下分层
再生顶板
相似材料
顶板运动
压力显现
remaining lower slice
regenerated roof
similar material
roof movement
strata behavior
