Geomechanical Model Test and Energy Mechanism Analysis of Zonal Disintegration in Deep Surrounding Rock
With the decreasing of shallow resources, underground roadways of resources exploitation have reached into deep rock mass with high geostress. A series of new failure phenomena such as zonal disintegration phenomenon were discovered in deep surrounding rock, which is completely different from shallo...
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2018-06-01
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doaj-b16c358aa70740109456bcf65a6e47e62020-11-25T01:01:54ZengMDPI AGGeosciences2076-32632018-06-018723710.3390/geosciences8070237geosciences8070237Geomechanical Model Test and Energy Mechanism Analysis of Zonal Disintegration in Deep Surrounding RockQiang Gao0Qiangyong Zhang1Xutao Zhang2Longyun Zhang3Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan 250061, ChinaResearch Center of Geotechnical and Structural Engineering, Shandong University, Jinan 250061, ChinaSchool of Architecture and Engineering, Liaocheng University, Liaocheng 252000, ChinaResearch Center of Geotechnical and Structural Engineering, Shandong University, Jinan 250061, ChinaWith the decreasing of shallow resources, underground roadways of resources exploitation have reached into deep rock mass with high geostress. A series of new failure phenomena such as zonal disintegration phenomenon were discovered in deep surrounding rock, which is completely different from shallow caverns. To reveal the formation mechanism of zonal disintegration, the geomechanical model test and energy mechanism analysis of zonal disintegration were carried out respectively. Taking the deep roadway of Dingji coal mine in China’s Huainan coal mine as engineering background, a 3D geomechanical model test was carried out relying on the high stress 3D loading test system. The zonal disintegration phenomenon was observed, and the oscillation law of displacement was measured. Based on the strain gradient theory and continuum damage mechanics, the elastoplastic damage model was established. An energy failure criterion was proposed by principle of energy dissipation and release. The ODE45 function in Matlab software was used to solve the displacements and stresses of excavated model roadway. The analytical solutions the and the geomechanical model test were basically consistent. The applicability of theoretical model and energy failure criterion were confirmed to explain the mechanism of zonal disintegration and it can be used to provide theoretical support for the failure and supporting design of surrounding rock in deep underground engineering.http://www.mdpi.com/2076-3263/8/7/237zonal disintegrationgeomechanical model testoscillation lawstrain gradientelastoplastic damage modelenergy failure criterion |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Qiang Gao Qiangyong Zhang Xutao Zhang Longyun Zhang |
spellingShingle |
Qiang Gao Qiangyong Zhang Xutao Zhang Longyun Zhang Geomechanical Model Test and Energy Mechanism Analysis of Zonal Disintegration in Deep Surrounding Rock Geosciences zonal disintegration geomechanical model test oscillation law strain gradient elastoplastic damage model energy failure criterion |
author_facet |
Qiang Gao Qiangyong Zhang Xutao Zhang Longyun Zhang |
author_sort |
Qiang Gao |
title |
Geomechanical Model Test and Energy Mechanism Analysis of Zonal Disintegration in Deep Surrounding Rock |
title_short |
Geomechanical Model Test and Energy Mechanism Analysis of Zonal Disintegration in Deep Surrounding Rock |
title_full |
Geomechanical Model Test and Energy Mechanism Analysis of Zonal Disintegration in Deep Surrounding Rock |
title_fullStr |
Geomechanical Model Test and Energy Mechanism Analysis of Zonal Disintegration in Deep Surrounding Rock |
title_full_unstemmed |
Geomechanical Model Test and Energy Mechanism Analysis of Zonal Disintegration in Deep Surrounding Rock |
title_sort |
geomechanical model test and energy mechanism analysis of zonal disintegration in deep surrounding rock |
publisher |
MDPI AG |
series |
Geosciences |
issn |
2076-3263 |
publishDate |
2018-06-01 |
description |
With the decreasing of shallow resources, underground roadways of resources exploitation have reached into deep rock mass with high geostress. A series of new failure phenomena such as zonal disintegration phenomenon were discovered in deep surrounding rock, which is completely different from shallow caverns. To reveal the formation mechanism of zonal disintegration, the geomechanical model test and energy mechanism analysis of zonal disintegration were carried out respectively. Taking the deep roadway of Dingji coal mine in China’s Huainan coal mine as engineering background, a 3D geomechanical model test was carried out relying on the high stress 3D loading test system. The zonal disintegration phenomenon was observed, and the oscillation law of displacement was measured. Based on the strain gradient theory and continuum damage mechanics, the elastoplastic damage model was established. An energy failure criterion was proposed by principle of energy dissipation and release. The ODE45 function in Matlab software was used to solve the displacements and stresses of excavated model roadway. The analytical solutions the and the geomechanical model test were basically consistent. The applicability of theoretical model and energy failure criterion were confirmed to explain the mechanism of zonal disintegration and it can be used to provide theoretical support for the failure and supporting design of surrounding rock in deep underground engineering. |
topic |
zonal disintegration geomechanical model test oscillation law strain gradient elastoplastic damage model energy failure criterion |
url |
http://www.mdpi.com/2076-3263/8/7/237 |
work_keys_str_mv |
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