Particle Flow Simulation of Failure Characteristics of Deep Rock Influenced by Sample Height-to-Width Ratios and Initial Stress Level under True-Triaxial Unloading
The micromechanism of the effects of different height/width ratios (H/W) and initial stress levels on unloading characteristics of deep rock was investigated based on PFC3D true-triaxial unloading simulation. The results show that the increase of H/W will increase the movement speed of rock particle...
Saved in:
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2021-01-01
|
| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2021/6631744 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850173270802825216 |
|---|---|
| author | Haoyu Rong Guichen Li Jiahui Xu Ruiyang Bi Yuantian Sun Yaqiao Hu Guoliang Bai |
| author_facet | Haoyu Rong Guichen Li Jiahui Xu Ruiyang Bi Yuantian Sun Yaqiao Hu Guoliang Bai |
| author_sort | Haoyu Rong |
| collection | DOAJ |
| description | The micromechanism of the effects of different height/width ratios (H/W) and initial stress levels on unloading characteristics of deep rock was investigated based on PFC3D true-triaxial unloading simulation. The results show that the increase of H/W will increase the movement speed of rock particles and intensify the acoustic emission (AE) activity inside the rock. With the increase of H/W, the failure mode of rock changes from splitting failure to tensile-shear failure. With increasing initial stress level, the particle velocity and overall fragmentation degree of rock increase. However, the increase of lateral stress will limit the coalescence of microfractures and weaken AE activity in the rock. Under unloading condition, the bonds between particles generally crack along the unloading direction, and the tensile effect is more pronounced under the condition of low initial stress level and high H/W. Under unloading condition, the variable energy of rock increases with increasing H/W and initial stress level, and the kinetic energy of rock particles increases with increasing H/W. The increase of initial stress level will increase the kinetic energy of rock particles when H/W is high. |
| format | Article |
| id | doaj-art-cd271ef24d4844dca7491c28f2d51a11 |
| institution | OA Journals |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-cd271ef24d4844dca7491c28f2d51a112025-08-20T02:19:53ZengWileyGeofluids1468-81151468-81232021-01-01202110.1155/2021/66317446631744Particle Flow Simulation of Failure Characteristics of Deep Rock Influenced by Sample Height-to-Width Ratios and Initial Stress Level under True-Triaxial UnloadingHaoyu Rong0Guichen Li1Jiahui Xu2Ruiyang Bi3Yuantian Sun4Yaqiao Hu5Guoliang Bai6School of Mines, Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaSchool of Mines, Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaSchool of Mines, Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaSchool of Mines, Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaSchool of Mines, Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaTongling Nonferrous Metals Group Holdings Co., Ltd. Technology Center, Tongling, Anhui 244000, ChinaTangshan Branch, Ecological Environment Technology Co., Ltd., China Coal Technology and Engineering Group Corp., Tangshan 063012, ChinaThe micromechanism of the effects of different height/width ratios (H/W) and initial stress levels on unloading characteristics of deep rock was investigated based on PFC3D true-triaxial unloading simulation. The results show that the increase of H/W will increase the movement speed of rock particles and intensify the acoustic emission (AE) activity inside the rock. With the increase of H/W, the failure mode of rock changes from splitting failure to tensile-shear failure. With increasing initial stress level, the particle velocity and overall fragmentation degree of rock increase. However, the increase of lateral stress will limit the coalescence of microfractures and weaken AE activity in the rock. Under unloading condition, the bonds between particles generally crack along the unloading direction, and the tensile effect is more pronounced under the condition of low initial stress level and high H/W. Under unloading condition, the variable energy of rock increases with increasing H/W and initial stress level, and the kinetic energy of rock particles increases with increasing H/W. The increase of initial stress level will increase the kinetic energy of rock particles when H/W is high.http://dx.doi.org/10.1155/2021/6631744 |
| spellingShingle | Haoyu Rong Guichen Li Jiahui Xu Ruiyang Bi Yuantian Sun Yaqiao Hu Guoliang Bai Particle Flow Simulation of Failure Characteristics of Deep Rock Influenced by Sample Height-to-Width Ratios and Initial Stress Level under True-Triaxial Unloading Geofluids |
| title | Particle Flow Simulation of Failure Characteristics of Deep Rock Influenced by Sample Height-to-Width Ratios and Initial Stress Level under True-Triaxial Unloading |
| title_full | Particle Flow Simulation of Failure Characteristics of Deep Rock Influenced by Sample Height-to-Width Ratios and Initial Stress Level under True-Triaxial Unloading |
| title_fullStr | Particle Flow Simulation of Failure Characteristics of Deep Rock Influenced by Sample Height-to-Width Ratios and Initial Stress Level under True-Triaxial Unloading |
| title_full_unstemmed | Particle Flow Simulation of Failure Characteristics of Deep Rock Influenced by Sample Height-to-Width Ratios and Initial Stress Level under True-Triaxial Unloading |
| title_short | Particle Flow Simulation of Failure Characteristics of Deep Rock Influenced by Sample Height-to-Width Ratios and Initial Stress Level under True-Triaxial Unloading |
| title_sort | particle flow simulation of failure characteristics of deep rock influenced by sample height to width ratios and initial stress level under true triaxial unloading |
| url | http://dx.doi.org/10.1155/2021/6631744 |
| work_keys_str_mv | AT haoyurong particleflowsimulationoffailurecharacteristicsofdeeprockinfluencedbysampleheighttowidthratiosandinitialstresslevelundertruetriaxialunloading AT guichenli particleflowsimulationoffailurecharacteristicsofdeeprockinfluencedbysampleheighttowidthratiosandinitialstresslevelundertruetriaxialunloading AT jiahuixu particleflowsimulationoffailurecharacteristicsofdeeprockinfluencedbysampleheighttowidthratiosandinitialstresslevelundertruetriaxialunloading AT ruiyangbi particleflowsimulationoffailurecharacteristicsofdeeprockinfluencedbysampleheighttowidthratiosandinitialstresslevelundertruetriaxialunloading AT yuantiansun particleflowsimulationoffailurecharacteristicsofdeeprockinfluencedbysampleheighttowidthratiosandinitialstresslevelundertruetriaxialunloading AT yaqiaohu particleflowsimulationoffailurecharacteristicsofdeeprockinfluencedbysampleheighttowidthratiosandinitialstresslevelundertruetriaxialunloading AT guoliangbai particleflowsimulationoffailurecharacteristicsofdeeprockinfluencedbysampleheighttowidthratiosandinitialstresslevelundertruetriaxialunloading |