软弱巷道顶板脆弱区识别及其应用
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摘要
针对宏观角度研究巷道顶板结构造成的顶板脆弱区被忽视的问题,建立了岩梁稳定条件下的单位宽度简支梁极限跨距判别公式。结合工程背景,分析得到软弱砂质泥岩厚度、巷道跨度、软弱夹层及断层等是影响巷道稳定性的重要原因。通过采用岩层探测仪窥探顶板裂隙分布及离层情况并结合钻孔柱状图,以砂质泥岩厚度为主要指标对巷道隐患进行分级、圈定。结果表明,311102辅运巷从开切眼到3~#联络巷之间属于Ⅳ级冒顶隐患区域。针对性的设计了311103辅运巷支护参数,实现了对顶板脆弱区的有效控制。
For the neglected problem of roof fragile zone due to the study of roadway roof structure in the macro perspective, the limited span discriminant formula of simply supported beam with unit width under the condition of the stability of beam was established. According to the engineering background, the thickness of weak sandy mudstone, the span of roadway, weak interlayer and fault are the important factors affecting the stability of roadway. By using stratum detector to observe the distribution of roof cracks and separation of strata and combining with borehole column diagram, the hidden dangers of roadway are classified and delineated by taking the thickness of sandy mudstone as the main index. The results show that 311102 auxiliary transportation roadway from the cutting hole to 3~# connecting lane belongs to the class Ⅳ roof hidden danger area. The supporting parameters of 311103 auxiliary transportation roadway were designed specifically to realize the effective control of the fragile area of the roof.
For the neglected problem of roof fragile zone due to the study of roadway roof structure in the macro perspective, the limited span discriminant formula of simply supported beam with unit width under the condition of the stability of beam was established. According to the engineering background, the thickness of weak sandy mudstone, the span of roadway, weak interlayer and fault are the important factors affecting the stability of roadway. By using stratum detector to observe the distribution of roof cracks and separation of strata and combining with borehole column diagram, the hidden dangers of roadway are classified and delineated by taking the thickness of sandy mudstone as the main index. The results show that 311102 auxiliary transportation roadway from the cutting hole to 3~# connecting lane belongs to the class Ⅳ roof hidden danger area. The supporting parameters of 311103 auxiliary transportation roadway were designed specifically to realize the effective control of the fragile area of the roof.
引文
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[12]曹俊才,左宇军,李伟,等.特厚复合顶板离层破坏机理研究[J].煤矿安全,2017,48(3):52-55.
[13]周波,袁亮,薛生.巷道围岩结构稳定性控制机理研究综述[J].煤矿安全,2018,49(5):214-217.
[14]侯朝炯,马念杰.煤层巷道两帮煤体应力和极限平衡区的探讨[J].煤炭学报,1989(4):21-29.
[15]李晋文.极限平衡理论在巷道锚杆支护设计中的应用[J].能源与节能,2013(3):126-128.
[2]诸利一,吕文生,杨鹏,等.2007-2016年全国煤矿事故统计及发生规律研究[J].煤矿安全,2018(7):237.
[3]刘洪涛,马念杰.煤矿巷道冒顶高风险区域识别技术[J].煤炭学报,2011,36(12):2043-2047.
[4]蒋力帅,马念杰,白浪,等.巷道复合顶板变形破坏特征与冒顶隐患分级[J].煤炭学报,2014,39(7):1205.
[5]马念杰,赵希栋,赵志强,等.深部采动巷道顶板稳定性分析与控制[J].煤炭学报,2015,40(10):2287.
[6]马念杰,冯吉成,吕坤,等.煤巷冒顶成因分类方法及其支护对策研究[J].煤炭科学技术,2015,43(6):34.
[7]贾明魁.锚杆支护煤巷冒顶成因分类新方法[J].煤炭学报,2005,30(5):568-570.
[8]许传华,任青文.围岩稳定分析的熵突变准则研究[J].岩土力学,2004,25(3):437-440.
[9]张召千,徐明德,刘泉声.煤巷围岩稳定性加权平均评价方法研究[J].岩土力学,2009,30(11):3464-3468.
[10]王琦,王洪涛,李术才,等.大断面厚顶煤巷道顶板冒落破坏的上限分析[J].岩土力学,2014(3):795.
[11]王根盛,张伟,朱友恒,等.大断面煤巷软厚顶板失稳机理与支护控制技术[J].煤矿安全,2016,47(7):170-173.
[12]曹俊才,左宇军,李伟,等.特厚复合顶板离层破坏机理研究[J].煤矿安全,2017,48(3):52-55.
[13]周波,袁亮,薛生.巷道围岩结构稳定性控制机理研究综述[J].煤矿安全,2018,49(5):214-217.
[14]侯朝炯,马念杰.煤层巷道两帮煤体应力和极限平衡区的探讨[J].煤炭学报,1989(4):21-29.
[15]李晋文.极限平衡理论在巷道锚杆支护设计中的应用[J].能源与节能,2013(3):126-128.