采动影响下底板应力分布特征及底鼓发生机理
Floor Stress Distribution Characteristics and Mechanism of Floor Heave Under the Influence of Mining
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摘要: 针对底鼓的发生机理开展研究，采用数值计算的方法分析了不同地应力集中程度下（λ＝1～3连续变化）底板岩体的受力及变形特征。结果显示：巷道底板在水平方向上按受力状态的差异可分为应力升高区、应力降低区和原岩应力区；在地应力集中程度增加的条件下，巷道底鼓量、巷帮变形量和峰值应力集中程度均明显增加。根据巷道底板围岩变形的差异可分为膨胀区、压缩膨胀区和压缩区。在沿底板水平方向和垂直方向的不同深度，存在椭圆形的底鼓零位移区，该区域内的岩体产生拉伸膨胀、在该区域以外的岩体受载压缩。Abstract: In view of the mechanism of floor heave, the stress and deformation behaviour of floor rock mass was studied and analyzed by numerical simulation in the situation of different stress concentration （continuous change of λ from 1 to 3）. The results showed that floor rock mass could be divided into three zones in horizontal direction. They were stress raising zone, stress reducing zone and initial stress zone. Under the condition of in-situ stress concentration increasing, the amount of floor heave, deformation of laneway’s side and peak stress concentration are significantly increased. According to the difference of floor surrounding rock deformation, expansive area, compressing expansive area and compressed area were devided. In the different depth along floor horizontal direction and vertical direction, there is elliptic zero deformation area of floor; the rock mass in this area produces stretching expansion and the rock mass outside the area is compressed.
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[1] 康红普,陆士良.巷道底鼓的挠曲效应及卸压效果分析[J].煤炭学报,1992,17(1):37-52. [2] 康红普,颜立新,郭相平,等.回采工作面多巷布置留巷围岩变形特征与支护技术[J].岩石力学与工程学报,2012,31(10):2022-2036. [3] 姜耀东,陆士良.巷道底朦的机理研究[J].煤炭学报,1994,19(4):343-351. [4] 柏建彪,李文峰,王襄禹,等.采动巷道底鼓机理与控制技术[J].采矿与安全工程学报,2011,28(11):1-5. [5] 杨生彬,何满潮,刘文涛,等.底角锚杆在深部软岩巷道底鼓控制中的机制及应用研究[J].岩石力学与工程学报,2008,27(1):2914-2920. [6] 穆朝元,马震.深部复杂地质条件岩巷底鼓变形机理分析与支护技术[J].煤矿安全,2016,47(4):95-98. [7] 孙玉宁,周鸿超,周建荣,等.半煤岩软底巷道底鼓控制技术[J].采矿与安全工程学报,2007,24(3):340. [8] 程少北,乔卫国,居彦治,等.软岩巷道底鼓锚注加固机理及数值模拟[J].煤矿安全,2014,45(9):32-39. [9] 谢广祥,常聚才.超挖锚注回填控制深部巷道底鼓研究[J].煤炭学报,2008,35(8):1242-1246. [10] Afrouz A. Geotechnical Assessment of the Bearing Capacity of Coal Mine Floors[J]. International Journal of Mining and Geological Engineering,1986(6):297. [11] 李树清,冯涛,王从陆,等.葛泉矿软岩大巷底鼓机理及控制[J].岩石力学与工程学报,2005,24(8):1451-1455. [12] 刘泉声,肖虎,卢兴利.高地应力破碎软岩巷道底鼓特性及综合控制对策研究[J].岩土力学,2012,33(6):11703-1710. [13] 李传森,赵建忠,王磊.水压致裂法在煤层巷道底鼓控制中的可行性[J].煤矿安全,2014,45(12):179. [14] 宋沛鑫.薄层装组合底板底鼓机理及及控制措施研究[D].太原:太原理工大学,2012.
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