水浸煤体周期应力承载特征研究
Study on periodic stress bearing characteristics of water-immersed coal body
-
摘要: 针对地下水库煤柱坝体长期在水浸-周期应力作用下渐进损伤问题，以陕西某矿地下水库工程为背景，通过现场调研、理论分析、实验室实验等方法分析了工作面末采阶段煤柱坝体所受应力环境，探究了周期应力以及水浸对煤体的破坏规律。结果表明：煤柱坝体形成前受采动影响存在诸多次生裂隙，形成以后受水浸以及相邻工作面的采动影响，应力呈多次循环加、卸载特征；煤体单轴压缩时抗压强度为18.40 MPa，破断载荷为36.11 kN，循环加卸载1、2、3次的破坏载荷分别为35.27、29.15、27.45 kN，表明周期应力有加剧煤体损伤的作用；随着水浸时间及加卸载循环次数的增加，煤体强度逐渐降低，无水浸加卸载1次条件下煤块强度为17.97 MPa，水浸21 d加卸载3次时强度为10.78 MPa。Abstract: For the long-term progressive damage of the coal pillar dam body of the underground reservoir under the action of water immersion-periodic stress, taking a mine in Shaanxi Province as the engineering background of the underground reservoir project, the working face was analyzed through field investigation, theoretical analysis and laboratory experiments. The stress environment of the coal pillar dam body in the final mining stage, and the damage law of cyclic stress and water immersion to the coal body were explored. The results show that there are many secondary fissures affected by mining before the formation of the coal pillar dam, and after the formation is affected by water immersion and the mining of adjacent working faces, the stress is characterized by multiple cycles of loading and unloading; the compressive strength is 18.40 MPa, the breaking load is 36.11 kN, and the failure loads of 1, 2, and 3 cycles of loading and unloading are 35.27, 29.15, and 27.45 kN, respectively, indicating that the cyclic stress has the effect of aggravating the coal damage; with the increase of the number of loading and unloading cycles, the coal strength gradually decreases. The coal strength is 17.97 MPa under the condition of one loading and unloading without water immersion, and 10.78 MPa when loading and unloading three times in 21 days.
-
-
［1］ ZHANG Cun, WANG Fangtian, BAI Qingsheng. Underground space utilization of coalmines in China: A review of underground water reservoir construction［J］. Tunnelling and Underground Space Technology, 2021, 107: 103657. ［2］ 李文平，李涛，陈伟，等.采空区储水-干旱区保水采煤新途径［J］.工程地质学报，2014，22（5）：1003-1007. LI Wenping, LI Tao, CHEN Wei, et al. Goaf water storage-a new way for water preserved mining in arid areas［J］. Journal of Engineering Geology, 2014, 22（5）: 1003-1007. ［3］ 许家林.煤矿绿色开采20年研究及进展［J］.煤炭科学技术，2020，48（9）：1-15. XU Jialin. Research and progress of coal mine green mining in 20 years［J］. Coal Science and Technology, 2020, 48（9）: 1-15. ［4］ 任艳芳.浅埋煤层长壁工作面围岩动态结构及应力特征分析［J］.煤炭科学技术，2020，48（8）：50-56. REN Yanfang. Analysis of dynamic stress characteristics and surrounding rock structure in shallow-buried longwall mining face［J］. Coal Science and Technology, 2020, 48（8）: 50-56. ［5］ 司磊磊，席宇君，王洪洋，等.水浸干燥后煤的孔隙结构及瓦斯吸附特性变化规律［J］.煤田地质与勘探，2021，49（1）：100-107. SI Leilei, XI Yujun, WANG Hongyang, et al. The characteristics of pore structure and gas adsorption for water-immersion coal after drying［J］. Coal Geology & Exploration, 2021, 49（1）: 100-107. ［6］ 翟小伟，蒋上荣，王博.水分对煤孔隙结构及自燃特性的影响研究现状［J］.煤矿安全，2020，51（2）：38-42. ZHAI Xiaowei, JIANG Shangrong, WANG Bo. Researchstatus of influence of water content on pore structure and spontaneous combustion characteristics of coal［J］. Safety in Coal Mines, 2020, 51（2）: 38-42. ［7］ 周宏伟，刘泽霖，孙晓彤，等.深部煤体注水过程中渗流通道演化特征［J］.煤炭学报，2021，46（3）：867-875. ZHOU Hongwei, LIU Zelin, SUN Xiaotong, et al. Evolution characteristics of seepage channel during water infusion in deep coal samples［J］. Journal of China Coal Society, 2021, 46（3）: 867-875. ［8］ 王刚，王世斌，李怀兴，等.考虑煤体孔-裂隙介尺度特征的水相渗流演化模型研究［J］.岩石力学与工程学报，2021，40（8）：1547-1558. WANG Gang, WANG Shibin, LI Huaixing, et al. Study on water phase seepage evolution model considering mesoscale characteristics of pore and fissure in coal［J］. Chinese Journal of Rock Mechanics and Engineering, 2021, 40（8）: 1547-1558. ［9］ 邵栋梁，王方田.煤岩体结构组分特性及应力损伤机制研究［J］.煤矿安全，2021，52（12）：1-8. SHAO Dongliang, WANG Fangtian. Structural components and stress damage mechanism of coal and rock mass［J］. Safety in Coal Mines, 2021, 52（12）: 1-8. ［10］ 余伟健，潘豹，李可，等.岩-煤-岩组合体力学特性及裂隙演化规律［J］.煤炭学报，2021：1-15. YU Weijian, PAN Bao, LI Ke, et al. Mechanical properties and fracture evolution law of rock-coal-rock combination［J］. Journal of China Coal Society, 2022, 47（3）: 1155-1168 ［11］ 唐一博，李云飞，薛生，等.长期水浸对不同烟煤自燃参数与微观特性影响的实验研究［J］.煤炭学报，2017，42（10）：2642-2648． TANG Yibo, LI Yunfei, XUE Sheng, et al. Experimental investigation of long-term water immersion effect on spontaneous combustion parameters and microscopic characteristics of bituminous［J］. Journal of China Coal Society, 2017, 42（10）: 2642-2648． ［12］ LI Huamin, LI Huigui, WANG Kailin, et al. Effect of rock composition microstructure and pore characteristics on its rock mechanics properties［J］. International Journal of Mining Science and Technology, 2018, 28（2）: 303-308. ［13］ 李振华，丁鑫品，程志恒.薄基岩煤层覆岩裂隙演化的分形特征研究［J］.采矿与安全工程学报，2010，27（4）：576-580. LI Zhenhua, DING Xinpin, CHENG Zhiheng. Research on fractal characteristics of overlying strata crack evolution in coal seam with thin bedrock［J］. Journal of Mining & Safety Engineering, 2010, 27（4）: 576-580. ［14］ 王振伟，马克，田洪圆，等.煤岩体应力波传播规律及其影响因素的数值分析［J］.煤炭科学技术，2019，47（6）：66-72. WANG Zhenwei, MA Ke, TIAN Hongyuan, et al. Numerical analysis on time delay law and its influence factors of stress wave propagation though cracks［J］. Coal Science and Technology, 2019, 47（6）: 66-72. ［15］ 钟江城，王子辉，王路军，等.基于CT三维重构的深部煤体损伤演化规律［J］.煤炭学报，2019，44（5）：1482-1494. ZHONG Jiangcheng, WANG Zihui, WANG Lujun, et al. Characteristics of damage evolution of deep coal based on CT three-dimensional reconstruction［J］. Journal of China Coal Society, 2019, 44（5）: 1482-1494. ［16］ 穆朝民，宫能平.煤体在冲击荷载作用下的损伤机制［J］.煤炭学报，2017，42（8）：2011-2018. MU Chaomin, GONG Nengping. Damage mechanism of coal under impact loads［J］. Journal of China Coal Sociely, 2017, 42（8）: 2011-2018.
-
期刊类型引用(2)
1. 杨森忠. 软岩巷道锚杆锚固性能试验分析. 内蒙古煤炭经济. 2024(02): 58-60 . 
百度学术
2. 高丹，岳中文，王鹏，岳小磊，闫逸飞，周星源，李杨. 锚固钻孔软弱夹层结构特征智能识别方法. 煤田地质与勘探. 2024(11): 200-210 . 百度学术
其他类型引用(0)
计量
- 文章访问数: 14
- HTML全文浏览量: 0
- PDF下载量: 5
- 被引次数: 2
下载:
