大松动圈下锚固承载层支护效应的弹塑性解
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摘要
对于大松动圈围岩巷道,锚杆和围岩共同作用在松动圈内部形成了"锚固承载层"。为研究大松动圈下"锚固承载层"对巷道围岩应力分布的影响,通过理论推导和实例分析,认为"锚固承载层"在极限平衡状态下对塑性区提供的支护强度pid由锚杆支护强度pi和锚固承载结构强度两部分组成,根据支护强度pi和锚固层厚度b的关系提出了"锚固界限厚度"概念。对于松动圈外的围岩,将巷道周边的应力分布进行了重新计算并与传统的FinnerKastner解进行了比较。研究表明:承载结构在巷道稳定性控制中占据主导作用,支护强度和承载结构协调作用更有利于巷道维护,修正Finner-Kastner解可为深部巷道围岩支护机理研究以及巷道支护参数设计提供理论依据。
For surrounding rock of roadway under large loosing zone,the interaction of anchor and surrounding rock forms"anchor bearing layer" within the loose zone. In order to study the influence of"anchorage bearing layer" on stress distribution of surrounding rock in roadway under large loosing zone,it is obtained that the support strength pidprovided by"anchorage bearing layer" in plastic zone under ultimate equilibrium state consists of two parts: bolt support strength piand anchorage bearing structure strength,by theoretical deduction and practical analysis. According to the relationship between support strength piand thickness of anchorage layer b,the concept of"anchorage limit thickness" is proposed. For the surrounding rock outside the loosening zone,the stress distribution around the roadway can be recalculated and compared with the traditional Finner-Kastner solution. The practice shows that the bearing structure plays a dominant role in keeping the stability of roadway,and the coordination of support strength and bearing structure is more conducive to the maintenance of the roadway.Modified Finner-Kastner solution can provide some reference for understanding supporting mechanism of deep roadway,and also provide corresponding theoretical basis for supporting parameter design of roadway.
For surrounding rock of roadway under large loosing zone,the interaction of anchor and surrounding rock forms"anchor bearing layer" within the loose zone. In order to study the influence of"anchorage bearing layer" on stress distribution of surrounding rock in roadway under large loosing zone,it is obtained that the support strength pidprovided by"anchorage bearing layer" in plastic zone under ultimate equilibrium state consists of two parts: bolt support strength piand anchorage bearing structure strength,by theoretical deduction and practical analysis. According to the relationship between support strength piand thickness of anchorage layer b,the concept of"anchorage limit thickness" is proposed. For the surrounding rock outside the loosening zone,the stress distribution around the roadway can be recalculated and compared with the traditional Finner-Kastner solution. The practice shows that the bearing structure plays a dominant role in keeping the stability of roadway,and the coordination of support strength and bearing structure is more conducive to the maintenance of the roadway.Modified Finner-Kastner solution can provide some reference for understanding supporting mechanism of deep roadway,and also provide corresponding theoretical basis for supporting parameter design of roadway.
引文
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[14]康红普.巷道围岩的承载圈分析[J].岩土力学,1996,17(4):84-89.Kang Hongpu.Analysis on load-bearing ring in surrounding rock of roadway[J].Rock and Soil Mechanics,1996,17(4):84-89.
[15]王同旭,麻洪蕊.巷道支护力作用及影响因素分析[J].山东科技大学学报:自然科学版,2009,28(4):40-42.Wang Tongxu,Ma Hongrui.The effect of roadway supporting forces and analysis of its influence factors[J].Journal of Shandong University of Science and Technology:Natural Science Edition,2009,28(4):40-42.
[16]彭瑞.深部巷道耦合支承层力学分析及分层支护控制研究[D].淮南:安徽理工大学,2017.Peng Rui.Mechanical Analysis of Compound Bearing Layer and Research on Multi-echelon Support in Deep Roadway[D].Huainan:Anhui University of Science and Technology,2017.
[2]王超,赵光明,孟祥瑞.考虑锚固复合承载体效应的巷道安全支护参数分析[J].金属矿山,2015(8):53-57.Wang Chao,Zhao Guangming,Meng Xiangrui.Roadway safety and support parameters analysis of considering composite bolt-rock bearing structure effec[tJ].Metal Mine,2015(8):53-57.
[3]康红普.巷道围岩的关键圈理论[J].力学与实践,1997,19(1):34-36.Kang Hongpu.Key zone theory of roadway surrounding rock[J].Mechanics and Practice,1997,19(1):34-36.
[4]方祖烈.拉压域特征及主次承载区的维护理论[C]//世纪之交软岩工程技术现状与展望.北京:煤炭工业出版社,1999:48-51.Fang Zulie.The characteristics of the pressure zone and the maintenance theory of the primary and secondary bearing areas[C]//The Present Situation and Prospect of Soft Rock Engineering Technology at the Turn of the Century.Beijing:China Coal Industry Publishing House,1999:48-51
[5]李树清.深部煤巷围岩控制内、外承载结构耦合稳定原理的研究[D].长沙:中南大学,2008.Li Shuqing.Study on Principal of Inner-outer Bearing Structures Coupling Stabilization for Strata Control around Deep Coal Drifts[D].Changsha:Central South University,2008.
[6]余伟健,高谦,朱川曲.深部软弱围岩叠加拱承载体强度理论及应用研究[J].岩石力学与工程学报,2010,29(10):2134-2143.Yu Weijian,Gao Qian,Zhu Chuanqu.Study of strength theory and application of overlap arch bearing body for deep soft surrounding rock[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(10):2134-2143.
[7]张益东.锚固复合承载体承载特性研究及在巷道锚杆支护设计中的应用[D].北京:中国矿业大学(北京),2013.Zhang Yidong.Study on Bearing Characteristic of Composite BoltRock Bearig Structure and Its Application in Roadway Bolting Design[D].Beijing:China University of Mining and Technology(Beijing),2013.
[8]姚琦,冯涛,王卫军,等.极破碎围岩半煤岩巷变形破坏机理及支护控制研究[J].中国安全生产科学技术,2015(5):32-39.Yao Qi,Feng Tao,Wang Weijun,et al.Study on deformation and failure mechanism and support control measure of half coal rock roadway under extremely fractured surrounding rock[J].Journal of Safety Science and Technology,2015(5):32-39.
[9]曹平,王飞,邱冠豪,等.软岩大变形巷道支护技术及应用[J].中国安全生产科学技术,2014(8):69-74.Cao Ping,Wang Fei,Qiu Guanhao,et al.Support technology and its application for large deformation of soft rock roadway[J].Journal of Safety Science and Technology,2014(8):69-74.
[10]康红普,姜鹏飞,蔡嘉芳.锚杆支护应力场测试与分析[J].煤炭学报,2014,39(8):1521-1529.Kang Hongpu,Jiang Pengfei,Cai Jiafang.Test and analysis on stress fields caused by rock bolting[J].Journal of China Coal Society,2014,39(8):1521-1529.
[11]王金华,康红普,高富强.锚索支护传力机制与应力分布的数值模拟[J].煤炭学报,2008,33(1):1-6.Wang Jinhua,Kang Hongpu,Gao Fuqiang.Numerical simulation on load-transfer mechanisms and stress distribution characteristics of cable bolts[J].Journal of China Coal Society,2008,33(1):1-6.
[12]何满潮,袁和生,靖洪文,等.中国煤矿锚杆支护理论与实践[M].北京:科学出版社,2004.He Manchao,Yuan Hesheng,Jing Hongwen,et al.Theory and Practice of Bolt Support in China[M].Beijing:Science Press,2004.
[13]宋宏伟,牟彬善.破裂岩石锚固组合拱承载能力及其合理厚度探讨[J].中国矿业大学学报,1997,26(2):33-36.Song Hongwei,Mu Binshan.Research on load capability and rational thickness of a reinforced broken rock arch[J].Journal of China University of Mining and Technology,1997,26(2):33-36.
[14]康红普.巷道围岩的承载圈分析[J].岩土力学,1996,17(4):84-89.Kang Hongpu.Analysis on load-bearing ring in surrounding rock of roadway[J].Rock and Soil Mechanics,1996,17(4):84-89.
[15]王同旭,麻洪蕊.巷道支护力作用及影响因素分析[J].山东科技大学学报:自然科学版,2009,28(4):40-42.Wang Tongxu,Ma Hongrui.The effect of roadway supporting forces and analysis of its influence factors[J].Journal of Shandong University of Science and Technology:Natural Science Edition,2009,28(4):40-42.
[16]彭瑞.深部巷道耦合支承层力学分析及分层支护控制研究[D].淮南:安徽理工大学,2017.Peng Rui.Mechanical Analysis of Compound Bearing Layer and Research on Multi-echelon Support in Deep Roadway[D].Huainan:Anhui University of Science and Technology,2017.