Mechanism analysis of permeability based on promoting coal matrix shrinkage by water jet |
| |
| Authors: | LU Yi-yu SONG Chen-peng LIU Yong KANG Yong |
| |
| Affiliation: | National & Local Joint Engineering Laboratory of Gas Drainage in complex cocl seam,Key Laboratory for the Exploitation of Southwest Resources and Environmental Disaster Control Engineering of Ministry of Education, Chongqing University, Chongqing 400044,China;National & Local Joint Engineering Laboratory of Gas Drainage in complex cocl seam,Key Laboratory for the Exploitation of Southwest Resources and Environmental Disaster Control Engineering of Ministry of Education, Chongqing University, Chongqing 400044,China;National & Local Joint Engineering Laboratory of Gas Drainage in complex cocl seam,Key Laboratory for the Exploitation of Southwest Resources and Environmental Disaster Control Engineering of Ministry of Education, Chongqing University, Chongqing 400044,China;National & Local Joint Engineering Laboratory of Gas Drainage in complex cocl seam,Key Laboratory for the Exploitation of Southwest Resources and Environmental Disaster Control Engineering of Ministry of Education, Chongqing University, Chongqing 400044,China |
| |
| Abstract: | High pressure pulsed water jet (HPWJ) is a new technology of effectively improving coal seam permeability. However, the mechanism of increased permeability is not yet clear, which restricts the application of HPWJ in different coal seams. From the perspective of improving permeability by coal matrix shrinkage, the impelled dynamic equations is established based on analysis of coal dynamic effects by water jet. According to theoretical analysis of the stress state of coal matrix, it is concluded that HPWJ can promote coal matrix shrinkage, and the relationship equation between jet impact-coal matrix is derived. Besides, the gas seepage function in the coal slotted by the HPWJ is gained by using PM model, which provides theoretical support for generalizing the technology in the coal mine. |
| |
| Keywords: | high pressure pulsed water jet coal matrix shrinkage permeability of coal gas seepage |
|
| 点击此处可从《保鲜与加工》浏览原始摘要信息 |
|
点击此处可从《保鲜与加工》下载全文 |
|
