含有软泥入侵的多溶洞型顶板巷道稳定控制研究
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摘要
针对有软弱黄泥入侵的多溶洞型复杂顶板,受多溶洞影响,顶板受压时会出现多处无规律的应力集中,易使围岩松动破裂、滑移冒落,承载能力大幅降低。本研究以永聚煤业10#煤轨道大巷为实例,通过实验测定煤、岩样的物理力学参数;采用FLAC3D模拟不同断面形状和支护方式对巷道稳定性的影响,包括巷道围岩塑性区分布规律和围岩应力分布、变形等特征;工程应用与监测,对比不同断面形状与支护方式时巷道围岩稳定性。结果表明:拱形巷道断面及合理的支护方式可改善巷道围岩的应力状态,较好地控制了围岩塑性区破坏范围,有效降低了围岩的变形量,能够更好地维护岩溶入侵溶洞型顶板巷道的稳定性。
More karst cave roofs with weak mud invasion are affected by karst caves.More irregular stress concentration occurs when the roofs are under pressure,thus easily resulting in loose cracking,sliding and caving of surrounding rocks and dramatically reducing its bearing strength.Taking No.10 rail roadway of Yongju Coal Industry for instance,the physical and mechanics parameters of coal and rock samples are measured through experiments.The FLAC3 Dis adopted to simulate the influences of different cross-section shape and support way on the roadway stability,including the plastic zone distribution regularity and the stress distribution and deformation of surrounding rocks.Through the engineering applications and monitoring,the stability of surrounding rocks around roadway under different cross-section shape and support way is contrasted.The results indicate that the arched section jointed with rational support can improve the stress status of tunnel surrounding rocks,better control the failure area of plastic zone,and effectively lower the rock deformation.Also,it can better maintain the stability of the karst cave roof with rocks invasion.
More karst cave roofs with weak mud invasion are affected by karst caves.More irregular stress concentration occurs when the roofs are under pressure,thus easily resulting in loose cracking,sliding and caving of surrounding rocks and dramatically reducing its bearing strength.Taking No.10 rail roadway of Yongju Coal Industry for instance,the physical and mechanics parameters of coal and rock samples are measured through experiments.The FLAC3 Dis adopted to simulate the influences of different cross-section shape and support way on the roadway stability,including the plastic zone distribution regularity and the stress distribution and deformation of surrounding rocks.Through the engineering applications and monitoring,the stability of surrounding rocks around roadway under different cross-section shape and support way is contrasted.The results indicate that the arched section jointed with rational support can improve the stress status of tunnel surrounding rocks,better control the failure area of plastic zone,and effectively lower the rock deformation.Also,it can better maintain the stability of the karst cave roof with rocks invasion.
引文
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[2]李仁江,盛谦,张勇慧,等.溶洞顶板极限承载力研究[J].岩土力学,2007,28(8):1622-1629.Li Renjiang,Sheng Qian,Zhang Yonghui,et al.Study on ultimate bearing capacity of upper rock plate of karst cave[J].Rock and Soil Mechanics,2007,28(8):1622-1629.
[3]杨永康.大厚度泥岩顶板煤巷破坏机制及控制对策研究[J].岩石力学与工程学报,2011,30(1):59-66.Yang Yongkang.Damage mechanics of mudstone roof with greatthick in coal roadway and its controlling countermeasures[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(1):59-66.
[4]苏学贵,李彦斌,田万寿.煤矿巷道支护与矿压观测研究[J].太原理工大学学报,2008,39(5):527-529.Su Xuegui,Li Yanbin,Tian Wanshou.Mine roadway support and mine pressure observation[J].Journal of Taiyuan University of Technology.,2008,39(5):527-529.
[5]钱鸣高,石平五.矿山压力与岩层控制[M].徐州:中国矿业大学出版社,2003.Qian Minggao,Shi Pingwu.Mining Pressure and Strata Control[M].Xuzhou:China University of Mining and Technology Press,2003.
[6]卞恩林,王利民,田春光.巷道断面最佳设计[J].煤炭技术,1999,18(2):14-28.Bian Enlin,Wang Limin,Tian Chunguang.Best design of the heading section[J].Coal Technology,1999,18(2):14-28.
[7]吴忠,罗运军,秦本东.断面形状对巷道稳定性影响的研究[J].矿山压力与顶板管理,2004,4(4):41-43.Wu Zhong,Luo Yunjun,Qin Bendong.Study on the effects of crosssection shape of roadway stability[J].Mining Pressure and Roof Administration,2004,4(4):41-43.
[8]殷展眉,李霞,金宝宏.煤矿巷道断面形状及锚杆支护围岩变形的数值分析[J].宁夏工程技术,2012,11(1):49-53.Yin Zhanmei,Li Xia,Jin Baohong.Analysis of coal mine roadway section shape and deformation of support surrounding rock bolt numerical[J].Ningxia Engineering Technology,2012,11(1):49-53.