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时间:2020-03-25
《沿空留巷直接顶受力变形理论分析.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、Vo1.40No.5矿业安全与环保第40卷第5期0ct.2013MININGSAFETY&ENVIRONMENTALPROTECTION2013年10月张自政,陈勇,刘学勇,等.沿空留巷直接顶受力变形理论分析[J].矿业安全与环保,2013,40(5):96-100文章编号:1008—4495(2013)05—0096—05沿空留巷直接顶受力变形理论分析张自政一,陈勇一,刘学勇一,冯平海’(1.中国矿业大学矿业工程学院,江苏徐州221116;2.煤炭资源与安全开采国家重点实验室,江苏徐州221116)摘要:在基本顶给定变形作用下,直接顶近似为可变形体,考虑到塑性区范围实体煤的支撑压力,建立了
2、综采沿空留巷整体力学模型,研究了直接顶的受力变形问题。根据建立的直接顶悬伸部分的力学模型,利用位移变分法求解了直接顶下沉量与巷内支护阻力、巷旁支护阻力、直接顶弹性模量、直接顶高度、巷道宽度、充填体宽度、塑性区宽度以及直接顶回转角之间的关系。结果表明:直接顶下沉量随着直接顶弹性模量、巷道宽度、充填体宽度、塑性区宽度以及直接顶回转角的增加而增大,巷旁支护阻力比巷内支护阻力对直接顶下沉量的减小作用更加明显;直接顶下沉量随着巷内支护阻力、巷旁支护阻力、直接顶高度增加而减小。关键词:沿空留巷;直接顶;变分法;直接顶下沉量中图分类号:TD354文献标志码:A网络出版时间:2013—09-1616:09网
3、络出版地址:http://www.cnki.net/kcms/detail/50.1062.TD.20130916.1609.029.htmlTheoreticalAnalysisonStressandDeformationofImmediateRoofinRoadwayRetainedalongGobZHANGZizheng1CHENYong:LIUXueyong,FENGPinghail'2,,(,.Schoolof,ChinaUniversityofMiningandTechnology,Xuzhou221116,China;2.StateKeyLaboratoryofCoalReso
4、urcesandSafeMining,ChinaUniversityofMiningandTechnology,Xuzhou221116,China)Abstract:Theimmediateroofcanbeapproximatelyregardedasavariablebodyundertheactionofagivendeformationofthemainroof.Inthispaper,aglobalmechanicalmodelfortheroadwayretainedalonggobwasestablishedbytakingtheabutmentpressureoftheso
5、lidcoalintheplasticareaintoconsiderationandresearchwasmadeOilthestressanddeformationoftheimmediateroof.Basedonthemechanicalmodelofthecantileverimmediateroof,thedisplacementvariationalmethodwasusedtosolvetherelationshipsoftheimmediateroofconvergencewiththeroadwaysupportresistance,theroadsidesuppo~re
6、sistance,theelasticmodulusofimmediateroof,theheightofimmediateroof,theroadwaywidth,thebaekfilledwidth,thewidthofplasticzoneandtherotationangleofimmediateroof.Theresultsindicatedthattheimmediateroofconvergenceincreasedwiththeincreaseoftheelasticmodulusofimmediateroof,theroadwaywidth,thebackfilledwid
7、th,thewidthofplasticzoneandtherotationangleofimmediateroof;thereductionofimmediateroofconvergencewaslargerundertheeffectofroadsidesupportresistancethanroadwaysupportresistance;theimmediateroofconvergencedec
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