三软煤层巷道掘进防漏顶预注浆液扩散规律研究
Study on diffusion law of pre-grouting slurry for leakproof roof of roadway development in coal seam with soft floor，soft roof and soft coal
-
摘要: 针对三软煤层巷道围岩强度低和随掘随冒现象严重的问题，采用掘进工作面预注浆治理顶板冒落，根据达西定律和渗透注浆理论关于既定浆液在煤体中的扩散规律，试验测得赵家寨矿煤体的渗透系数、孔隙率和浆液的流体力学参数。以此参数为基础，通过数值模拟试验揭示了注浆孔周边孔隙压力分布与饱和度变化规律，分析了掘进工作面不同应力状态对浆液扩散的影响，对比了不同注浆压力下孔隙压力和饱和度分布曲线，发现应力状态对浆液最大扩散半径影响较小，提高注浆压力能在一定时间段内提高注浆效率，但并不能显著提高浆液扩散半径。综合理论计算和数值模拟结果，确定注浆量0.06 m3/min，注浆压力为2.5 MPa，与数值模拟计算结果较接近，因此扩散半径确定为1.4 m，并将该结果运用于赵家寨矿掘进巷道施工现场，通过钻孔取心检查注浆效果，发现浆液扩散与预期结果吻合良好。Abstract: In view of the problems of low surrounding rock strength and serious roof falling during driving in three-soft coal seam, pre-grouting in driving face is adopted to control roof fall. According to Darcy's law and infiltration grouting theory about the diffusion law of established slurry in coal, the permeability coefficient, porosity and hydrodynamic parameters of the slurry in Zhaojiazhai coal mine were determined in the test. On the basis of these parameters, the numerical simulation experiment was used to reveal the change of pore pressure distribution and saturation around the grouting hole, and the effect of different stress states on the slurry diffusion in the driving face was analyzed. Compared with the distribution curves of pore pressure and saturation around the grouting hole under different grouting pressure and according to the degree distribution curve, it was found that the stress state has little effect on the maximum diffusion radius of slurry. Combining theoretical calculation and numerical simulation results, the grouting volume was determined to be 0.06 m3/min, and the grouting pressure was determined to be 2.5 MPa, which was close to the numerical simulation calculation results, so the diffusion radius was determined to be 1.4 m, and this result was applied to the Zhaojiazhai coal mine roadway development construction site, the grouting effect was checked by drilling cores, and it was found that the slurry diffusion was in good agreement with the expected results.
-
Keywords:
- permeation grouting theory /
- diffusion radius /
- stress state /
- grouting pressure
-
-
期刊类型引用(8)
1. 张傲天. 厚硬煤层综放开采预裂技术研究. 凿岩机械气动工具. 2025(01): 116-118 . 
百度学术
2. 郭伟. 大采高工作面厚硬顶板预裂技术研究. 凿岩机械气动工具. 2025(01): 113-115 . 百度学术
3. 马洪飞，底俊臣，王国牛，牛延汀，李书宾. 西庞井9303工作面厚硬顶板切顶卸压技术研究. 煤炭技术. 2025(03): 13-17 . 百度学术
4. 张丁丁. 智能化综采工作面切顶卸压沿空留巷技术研究. 能源与节能. 2025(03): 182-184+266 . 百度学术
5. 吴衡. 新田煤矿1901工作面沿空留巷支护设计. 能源与节能. 2025(03): 282-284 . 百度学术
6. 张进波. 铝基高固水巷旁充填沿空留巷技术研究与应用. 煤. 2024(11): 29-33+48 . 百度学术
7. 王世宇，张昌锁，王凯飞，张胜利. 地面深孔水压爆破弱化厚硬顶板技术研究. 山东科技大学学报(自然科学版). 2024(05): 1-12 . 百度学术
8. 孟国龙. 某深部煤层综采工作面切顶卸压留巷技术研究. 现代矿业. 2024(12): 48-51+59 . 百度学术
其他类型引用(2)
下载:
图(11)
计量
- 文章访问数: 122
- HTML全文浏览量: 1
- PDF下载量: 324
- 被引次数: 10
