Stress Field Zoning and Length Optimization Design of Pressure Relief Borehole
-
摘要: 利用极坐标和直角坐标系建立卸压钻孔力学模型，分析了巷道侧向支承压力与卸压钻孔周围煤体应力之间的联系，得到巷帮煤体的卸载应力及卸压系数；根据卸压前后巷帮煤体的应力状态，将卸压钻孔应力场划分为4个应力区，分别为塑—塑性区、弹—塑性区、塑—弹性区和弹—弹性区，卸压作用主要在塑—弹性区和弹—弹性区；结合卸压前巷帮煤体的应力场分区，分析了卸压钻孔的最优长度，指出钻孔长度应根据卸压前巷道侧向支承压力分布进行设计；施工卸压钻孔后，卸载应力呈中间高两边低的规律，而在未施工钻孔的区域，煤体应力保持不变。采用数值模拟的方法，对比研究了薛湖煤矿不同长度钻孔的卸压效果，得到最优钻孔长度为20 m左右。Abstract: The pressure relief drilling mechanics model established by polar and rectangular coordinate system was used to analyze the relationship between the lateral abutment pressure of roadway and the stress distribution of coal body around pressure relief borehole,the unloading stress and the pressure relief coefficient of coal body were obtained.According to the stress state of the coal body before and after pressure relief,the stress field of pressure relief borehole was divided into four stress zones.They were plastic - elastic zone,elastic - plastic zone,plastic - elastic zone and elastic - elastic zone.The pressure relief was mainly in plastic - elastic zone and elastic - elastic zone.The optimal length of pressure relief borehole was analyzed combined with the stress field zoning of coal body before pressure relief.The results showed that borehole length should be designed according to the lateral abutment pressure distribution of roadway before pressure relief.The unloading stress was middle high and both sides low after pressure relief borehole,while the coal body stress remained unchanged in the area without pressure relief borehole.The numerical simulation method was used to study the pressure relief effect of different borehole length in Xuehu coal mine,then came to the conclusion that the optimal borehole length was about 20 m.
-
-
[1] 谢和平,高峰,鞠杨,等.深部开采的定量界定与分析[J].煤炭学报,2015,40(1):1-10. [2] 兰永伟,高红梅,陈学华.钻孔卸压效果影响因素数值模拟研究[J].矿业安全与环保,2013,40(3):6-9. [3] 孙国文.上邻近层卸压抽放钻孔布孔方式改进研究[J].矿业安全与环保,2013,40(4):91-94. [4] 王中华.预掘底板岩巷穿层钻孔卸压抽采试验研究[J].矿业安全与环保,2016,43(5):87-89. [5] 易恩兵,牟宗龙,窦林名,等.软及硬煤层钻孔卸压效果对比分析研究[J].煤炭科学技术,2011,39(6):1-5. [6] 岳崇光,黄炳香,孙开龙.深井突出煤层孤岛工作面钻孔卸压与应力转移规律研究[J].中国煤炭,2014,40(2):56-59. [7] 谭云亮,吴士良,尹增德,等.矿山压力与岩层控制[M].北京:煤炭工业出版社,2008:32-36. [8] 张兆民.大直径钻孔卸压机理及其合理参数研究[D].青岛:山东科技大学,2011:1-3. [9] 刘德峰,郭兵兵,刘长武,等.考虑工程扰动和地质条件的巷帮极限平衡区分析[J].煤炭学报,2017,42(3):597-603. [10] 赵健,张鹏.沿空留巷围岩给定变形及巷旁支护时机研究[J].煤炭工程,2017,49(2):68-71. [11] 耿敏敏,马占国,龚鹏,等.高应力煤巷卸压孔布置方式对卸压效果影响分析[J].中国安全生产科学技术,2012,8(11):5-10. [12] 郑贺,王猛,徐少辉.深部巷道围岩钻孔卸压与围岩控制技术研究[J].矿业安全与环保,2014,41(5):51-55. [13] 何荣兴,任凤玉,丁航行,等.巷道卸压法应力迁变规律及卸压参数的确定[J].东北大学学报(自然科学版),2015,36(10):1457-1460. [14] 李金奎,刘东生,李学彬,等.小煤柱应力集中区钻孔卸压效果的数值模拟[J].西安科技大学学报,2009,29(5):527-530. [15] 魏振全.迎采空区工作面冲击地压危险性分析与防治技术[J].煤炭科学技术,2015,43(11):12-15. -
期刊类型引用(7)
1. 王东，白峰. 孤岛工作面钻孔卸压效果研究及实践. 煤炭与化工. 2024(08): 16-20+26 . 
百度学术
2. 吴洋，左宇军，陈庆港，林健云，陈斌，郑禄璟. 深部高应力巷道钻孔卸压围岩能量耗散特征与钻孔参数研究. 矿业研究与开发. 2024(10): 1-9 . 百度学术
3. 张凯，刘光伟，赵志刚，郑雅华. 煤体应力监测模拟试验设备研制与应用. 矿业安全与环保. 2023(02): 71-76 . 本站查看
4. 郭忠华. 孤岛工作面巷道钻孔卸压机理及关键参数确定. 太原理工大学学报. 2020(06): 906-911 . 百度学术
5. 丁峰，狄正宝. 纳林河二号矿井31103-1工作面高度应力集中区钻孔卸压实践. 山东煤炭科技. 2020(12): 153-155 . 百度学术
6. 章旭虎. 三交河矿2-511工作面回风巷支护设计及钻孔卸压技术研究. 煤. 2019(09): 84-85+95 . 百度学术
7. 鲁健，弓培林，李鹏. 深井软岩巷道底鼓机理与钻孔卸压技术研究. 矿业安全与环保. 2019(06): 35-41 . 本站查看
其他类型引用(7)
计量
- 文章访问数: 26
- HTML全文浏览量: 0
- PDF下载量: 6
- 被引次数: 14
下载:
