| Autor: |
Zhang Bin, Xu Yanchun, Li Jianghua, Xiong Bin |
| Jazyk: |
English<br />Chinese |
| Rok vydání: |
2019 |
| Předmět: |
|
| Zdroj: |
矿业科学学报, Vol 4, Iss 6, Pp 515-523 (2019) |
| Druh dokumentu: |
article |
| ISSN: |
2096-2193 |
| DOI: |
10.19606/j.cnki.jmst.2019.06.006 |
| Popis: |
Water and sand inrush is one of the principal factors that restrict safe and effective production of mining under water body.The threat to soft strata mines with extremely thick coal seam is especially more serious.Caving zone and fissure zone(joint name "two-zone") heights are the basic parameters of water inrush prediction.This paper observes the "two-zone" heights of extra-thick coal seam with slicing full-mechanized caving mining in soft stratum with comprehensive measures of flushing fluid leakage,color borehole TV and core-drilling,and researches the fracture field characteristics of overburden failure through discrete element numerical method.The research results are as follows:under the condition of extra-thick coal seam with slicing full-mechanized caving mining in soft stratum,the stratum movement angle of top slicing working face is about 75°,the ratio is 5.60~5.62 between caving zone and mining height,the ratio is 11.67~12.20 between fissure zone and mining height;the ratio is 4.59~4.71 between caving zone and mining height,the ratio is 8.04~8.58 between fissure zone and mining height in the bottom slicing working face;the height of caving zone increases by 49.41%~50.85% and the height of fissure zone increases by 21.72%~25.38%,but the ratio between caving zone and mining height decreases by 16.19%~18.33%,the ratio between fissure zone and mining height decreases by 29.67%~34.10% when the mining height of the bottom working face is 78.28%~84.71% of the top working face.The research results can provide reference for water damage prediction and the height of safety coal and rock pillar in slicing full-mechanized caving mining face under loose aquifer. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
|
