Coupling Model of Stress-Damage-Seepage and Its Application to Static Blasting Technology in Coal Mine.
Coupling Model of Stress-Damage-Seepage and Its Application to Static Blasting Technology in Coal Mine.
复制标题
应力-损伤-渗流耦合模型及其在煤矿静态爆破技术中的应用
DOI：
10.1021/acsomega.1c05574
复制
发表时间：
2021-12-21
期刊：
影响因子：
4.1
通讯作者：
Wu Z
中科院分区：
文献类型：
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作者：
Liu J;Zhang L;Wei Y;Wu Z
由于对静力爆破技术的裂缝发展规律认识不足，煤矿现场应用过程大多采用经验公式进行。这种认识的缺乏导致了煤层气开采效果不佳。本研究利用COMSOL仿真软件建立了应力-损伤耦合模型，研究了静力爆破技术的结构参数。然后，设计了应力-损伤-渗流耦合模型，利用真实的破坏过程分析模拟软件研究了静态爆破过程中裂隙场(渗流场)的演化。最后，对影响因素和压裂效果进行了综合分析。研究结果表明：(1)将模拟结果与以往的现场试验结果进行对比，发现静力爆破技术数值模拟的渗流规律与现场试验结果基本一致，验证了应力-损伤-渗流耦合模型的合理性。(2)煤层裂隙发育受膨胀压力、弹性模数和导孔布置的影响，导孔布置对指导裂隙发育方向，提高压裂效果具有重要作用。(3)煤体主要经历了煤体压实、微损伤形成、微裂隙形成、大裂隙形成和裂隙扩展五个阶段。此外，由于大裂缝形成阶段无声破裂剂的快速释放，导致气体流量在短时间内下降。(4)静爆技术使煤层透气性系数增大。与常规开采相比，水平方向的有效影响半径增加了5.1倍，垂直方向的有效影响半径增加了约3倍。静态爆破技术可以增加煤层裂隙的数量，显著降低煤层瓦斯压力，从而增强煤层的透气性，实现安全开采。
Most coal mine field application processes are carried out using empirical formulas because of the insufficient understanding of the fracture development law of the static blasting technology. This lack of understanding results in poor coal seam gas extraction. In this study, a stress–damage coupling model was established to investigate the construction parameters of the static blasting technology using COMSOL simulation software. Then, a stress–damage–seepage coupling model was designed to study the evolution of the fracture field (seepage field) during the static blasting process using realistic failure process analysis simulation software. Finally, the influencing factors and fracturing effects were analyzed comprehensively. The research results show the following. (1) Comparing the simulation results with previous field tests reveals that the seepage law of the numerical simulation of the static blasting technology is consistent with the field test results, verifying the rationality of the stress–damage–seepage coupling model. (2) The development of coal seam fractures is affected by the expansion pressure, elastic modulus, and guide hole arrangement; the guide hole arrangement can play a role in guiding the development direction of fractures and enhancing the effect of fracturing. (3) The coal body mainly experienced the following five stages of fracturing: coal body compaction, microdamage formation, microfracture formation, large fracture formation, and fracture propagation. In addition, because of the rapid release of soundless cracking agents during the large fracture formation stage, the gas flow decreased in a short time. (4) The static blasting technology causes the coal seam permeability coefficient to increase. Compared with conventional extraction, the effective influence radius in the horizontal direction increases by 5.1 times, and the effective influence radius in the vertical direction increases by approximately 3 times. The static blasting technology can increase the number of coal seam fractures and significantly reduce the coal seam gas pressure, thereby enhancing coal seam permeability and realizing safe coal mining.
影响因子：
2.7
作者：
Laefer, D. F.;Ambrozevitch-Cooper, N.;Wortman, J.
通讯作者：
Wortman, J.
影响因子：
--
作者：
Wu, Shangjian;Zhai, Cheng;Dong, Ruowei
通讯作者：
Dong, Ruowei
影响因子：
--
作者：
Cui, Xiao;Zhang, Jiayong;Gong, Xuemin
通讯作者：
Gong, Xuemin