Study on the Prediction of the Height of Two Zones in the Overlying Strata under a Strong Shock
A development of overlying strata fractures and an unknown distribution of the two zones, which results from a strong shock tendency roof short-distance coal seam group mining, are the main problems faced by Xiashijie Coal Mine. Consequently, an experiment has been conducted; here are the steps: des...
Saved in:
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2021-01-01
|
| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2021/4237061 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849308423458390016 |
|---|---|
| author | Xingping Lai Bowei Liu Pengfei Shan Feng Cui Yun Zhang Xudong Zhang Rui Bai Xuan Wu |
| author_facet | Xingping Lai Bowei Liu Pengfei Shan Feng Cui Yun Zhang Xudong Zhang Rui Bai Xuan Wu |
| author_sort | Xingping Lai |
| collection | DOAJ |
| description | A development of overlying strata fractures and an unknown distribution of the two zones, which results from a strong shock tendency roof short-distance coal seam group mining, are the main problems faced by Xiashijie Coal Mine. Consequently, an experiment has been conducted; here are the steps: designing an underlying strata development law and the two-zone distribution physical similarity simulation test under the short-distance coal seam group combined mining, using the BT-AE to comonitor the fracture development law and the distribution characteristics of the caving zone and the water-conducting fractured zone, and combining with 3DEC comparative analysis. The results show that after the coal seam mining is over, the number of overlying fractures increases with depth, controlled by the mining stress field in the direction of 115° west from north to west. The direction of overlying fracture is mainly concentrated in the area of 300° ~30°; the overlying fracture angles eventually develop to 81° and 74°, increasing by 15.7% and 8.8%, and the caving ratio and cracking ratio are 4.87 and 17.75. After comparing with the numerical calculation results, the reliability of the two zones obtained by the physical similarity simulation test is verified. The AE analysis results show that the “release-accumulate-release” energy evolution process of overlying rock fracture under mining conditions has a phased relationship with fracture expansion. The energy positioning results are consistent with the distribution of BT observation cracks, and the large energy events are mostly concentrated in the collapse zone, indicating that AE has the practicality of disaster warning. The results of this study provide scientific guidance for water-preserving mining under the combined mining of coal seams with a strong impact tendency roof in Xiashijie Coal Mine. |
| format | Article |
| id | doaj-art-0ad254a39f144daeaf465e26e006dcd4 |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-0ad254a39f144daeaf465e26e006dcd42025-08-20T03:54:28ZengWileyGeofluids1468-81151468-81232021-01-01202110.1155/2021/42370614237061Study on the Prediction of the Height of Two Zones in the Overlying Strata under a Strong ShockXingping Lai0Bowei Liu1Pengfei Shan2Feng Cui3Yun Zhang4Xudong Zhang5Rui Bai6Xuan Wu7School of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaSchool of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaSchool of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaSchool of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaSchool of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaSchool of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaSchool of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaChina-ASEAN Geosciences Cooperation Center (Nanning), Nanning, Guangxi 530023, ChinaA development of overlying strata fractures and an unknown distribution of the two zones, which results from a strong shock tendency roof short-distance coal seam group mining, are the main problems faced by Xiashijie Coal Mine. Consequently, an experiment has been conducted; here are the steps: designing an underlying strata development law and the two-zone distribution physical similarity simulation test under the short-distance coal seam group combined mining, using the BT-AE to comonitor the fracture development law and the distribution characteristics of the caving zone and the water-conducting fractured zone, and combining with 3DEC comparative analysis. The results show that after the coal seam mining is over, the number of overlying fractures increases with depth, controlled by the mining stress field in the direction of 115° west from north to west. The direction of overlying fracture is mainly concentrated in the area of 300° ~30°; the overlying fracture angles eventually develop to 81° and 74°, increasing by 15.7% and 8.8%, and the caving ratio and cracking ratio are 4.87 and 17.75. After comparing with the numerical calculation results, the reliability of the two zones obtained by the physical similarity simulation test is verified. The AE analysis results show that the “release-accumulate-release” energy evolution process of overlying rock fracture under mining conditions has a phased relationship with fracture expansion. The energy positioning results are consistent with the distribution of BT observation cracks, and the large energy events are mostly concentrated in the collapse zone, indicating that AE has the practicality of disaster warning. The results of this study provide scientific guidance for water-preserving mining under the combined mining of coal seams with a strong impact tendency roof in Xiashijie Coal Mine.http://dx.doi.org/10.1155/2021/4237061 |
| spellingShingle | Xingping Lai Bowei Liu Pengfei Shan Feng Cui Yun Zhang Xudong Zhang Rui Bai Xuan Wu Study on the Prediction of the Height of Two Zones in the Overlying Strata under a Strong Shock Geofluids |
| title | Study on the Prediction of the Height of Two Zones in the Overlying Strata under a Strong Shock |
| title_full | Study on the Prediction of the Height of Two Zones in the Overlying Strata under a Strong Shock |
| title_fullStr | Study on the Prediction of the Height of Two Zones in the Overlying Strata under a Strong Shock |
| title_full_unstemmed | Study on the Prediction of the Height of Two Zones in the Overlying Strata under a Strong Shock |
| title_short | Study on the Prediction of the Height of Two Zones in the Overlying Strata under a Strong Shock |
| title_sort | study on the prediction of the height of two zones in the overlying strata under a strong shock |
| url | http://dx.doi.org/10.1155/2021/4237061 |
| work_keys_str_mv | AT xingpinglai studyonthepredictionoftheheightoftwozonesintheoverlyingstrataunderastrongshock AT boweiliu studyonthepredictionoftheheightoftwozonesintheoverlyingstrataunderastrongshock AT pengfeishan studyonthepredictionoftheheightoftwozonesintheoverlyingstrataunderastrongshock AT fengcui studyonthepredictionoftheheightoftwozonesintheoverlyingstrataunderastrongshock AT yunzhang studyonthepredictionoftheheightoftwozonesintheoverlyingstrataunderastrongshock AT xudongzhang studyonthepredictionoftheheightoftwozonesintheoverlyingstrataunderastrongshock AT ruibai studyonthepredictionoftheheightoftwozonesintheoverlyingstrataunderastrongshock AT xuanwu studyonthepredictionoftheheightoftwozonesintheoverlyingstrataunderastrongshock |