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1、第21卷第4期(总第131期)煤矿开采Vol．21No．4(SeriesNo．131)2016年8月COALMININGTECHNOLOGYAugust2016矿山压力与灾害控制房式采空区失稳煤柱下回采异常矿压发生机理1,31,3241,31,3王寅,付兴玉,李凤明,刘文玉,张彬,李少刚(1．煤炭科学技术研究院有限公司安全分院,北京100013;2．煤炭科学技术研究院有限公司,北京100013;3．煤炭资源高效开采与洁净利用国家重点实验室(煤炭科学研究总院),北京100013;4.吉林省能源信息中心,吉林长春130021)[摘要]针对神东矿区石圪台煤矿312
2、01工作面在上覆房式采空区失稳煤柱下回采期间矿压显现异常问题,利用现场实测和理论分析方法,对失稳煤柱下回采矿压显现异常的机理进行了研究。结果表明:失稳煤柱下回采期间,上煤层失稳煤柱冒落覆岩断裂岩块间不能形成铰接结构,且工作面上方冒落覆岩上覆岩层断裂岩块与其前方岩层共同向下运动,从而增加了下煤层顶板受力,使工作面呈现来压步距减小、来压强度增大的特征;由于失稳煤柱覆岩对煤层间岩层的作用力相比出集中煤柱期间小,因此未发生动载矿压灾害;煤层间岩层厚度的增加将减小下煤层顶板受力,进而减小失稳煤柱下回采矿压显现强度;提出在上煤层房式采空区失稳煤柱覆岩运动较充分后再进行下
3、煤层开采的控制措施。[关键词]房式采空区;失稳煤柱;异常矿压;稳定铰接结构[中图分类号]TD323[文献标识码]A[文章编号]1006-6225(2016)04-0103-04OccurrenceMechanismofAbnormalPressurewithMiningunderInstabilityPillarofRoomandPillarGoaf1,31,3241,31,3WANGYin,FUXing-yu,LIFeng-ming,LIUWen-yu,ZHANGBin,LIShao-gang(1．MineSafetyTechnologyBranch,Ch
4、inaCoalResearchInstitute,Beijing100013,China;2．ChinaCoalResearchInstitute,Beijing100013,China;3．StateKeyLaboratoryofCoalResourceHighEffectiveMining&CleanUtilization(ChinaCoalResearchInstitute),Beijing100013,China;4．EnergyInformationCenterofJilinProvince,Changchun130021,China)Abstra
5、ct:Inordertosolvetheabnormalpressureproblemof31201workingfaceduringminingperiodunderupinstabilitypillarofroomandpillargoafofShigetaicoalmineinShendongminedistrict,onthebasisoffieldmeasurementandtheoryanalysis,themech-anismofabnormalpressurewasstudied．Theresultsshowedthatthebrokenro
6、ckblockthatformedbyupperinstabilitypillaroverburdenfallcouldnotformedhingestructure,andtheoverburdenbrokenrockblockthatformedbyfallingoverburdenaheadworkingfaceanditsfrontrockstratamoveddownwardtogether,androofpressureoflowercoalseamwouldincreased,thecharactersofworkingfacethatpres
7、sureintervaldecreasedandpressurestrengthincreasedappeared,theinteractionthatinstabilitypillaroverburdentorockstra-taofintercoalseamswassmallerthanthevalueduringconcentratedpillarperiod,sodynamicpressuredisasterwasprohibited,roofpressureoflowercoalseamswouldbedecreasedwiththethickne
8、ssofrockstrataincreasedint
