Experimental study on damage characteristics and permeability evolution of K1/J2 paleoweathered rocks under triaxial unloading-loading confining pressure path
Mud-sand inrush accidents in coal mining under extremely thick Cretaceous in Ordos Basin seriously threaten the safety of mine production and miners' life. Paleoweathered rock in the K 1 / J 2 unconformity contact zone ( K 1 / J 2 PWR) of the Ordos basin are key aquifuge under the Cretaceous aq...
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| Veröffentlicht in: | Natural hazards (Dordrecht) 2023-07, Vol.117 (3), p.2527-2552 |
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| creator | Li, Wenping Zhu, Tingen Wang, Qiqing Tian, Jiawei Lv, Zhenmeng Cheng, Yi |
| description | Mud-sand inrush accidents in coal mining under extremely thick Cretaceous in Ordos Basin seriously threaten the safety of mine production and miners' life. Paleoweathered rock in the
K
1
/
J
2
unconformity contact zone (
K
1
/
J
2
PWR) of the Ordos basin are key aquifuge under the Cretaceous aquifer and new material source of mud-sand inrush during coal mining. In this paper, the damage characteristics and permeability evolution of
K
1
/
J
2
PWR under triaxial unloading-loading confining pressure path (TULCPP) were studied by MTS8.04 testing machine, which is of great significance for mine disaster prevention and control. Results indicate that in the TULCPP process, with the increase of initial stress and clay mineral content (CMC) of the sample, the peak strength increases, and it is more difficult to expand, as well as the peak volume strain at the expansion point generally increases. The variation trend of permeability coefficient, AE counts and stored counts with axial strain is corresponding to different deformation stages, and it changes dramatically in the pre-peak plastic yield stage, showing a sharp increase trend. The permeability coefficient of
K
1
/
J
2
PWR shows a power-law and negative-exponential relationship with confining pressure. With the increase of initial stress, the relationship will change from power-law to negative-exponential, and this change first occurs in the samples with low CMC. With the increase of CMC, the permeability coefficient increase range expanded in the confining pressure unloading failure process, the permeability coefficient decline range decreased in the confining pressure loading process, and initial stress enhancement could restrain this trend. Based on the experimental data, the peak strength and permeability coefficient empirical equations for the
K
1
/
J
2
PWR considering confining pressure and CMC were established. |
| doi_str_mv | 10.1007/s11069-023-05955-6 |
| format | Article |
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K
1
/
J
2
unconformity contact zone (
K
1
/
J
2
PWR) of the Ordos basin are key aquifuge under the Cretaceous aquifer and new material source of mud-sand inrush during coal mining. In this paper, the damage characteristics and permeability evolution of
K
1
/
J
2
PWR under triaxial unloading-loading confining pressure path (TULCPP) were studied by MTS8.04 testing machine, which is of great significance for mine disaster prevention and control. Results indicate that in the TULCPP process, with the increase of initial stress and clay mineral content (CMC) of the sample, the peak strength increases, and it is more difficult to expand, as well as the peak volume strain at the expansion point generally increases. The variation trend of permeability coefficient, AE counts and stored counts with axial strain is corresponding to different deformation stages, and it changes dramatically in the pre-peak plastic yield stage, showing a sharp increase trend. The permeability coefficient of
K
1
/
J
2
PWR shows a power-law and negative-exponential relationship with confining pressure. With the increase of initial stress, the relationship will change from power-law to negative-exponential, and this change first occurs in the samples with low CMC. With the increase of CMC, the permeability coefficient increase range expanded in the confining pressure unloading failure process, the permeability coefficient decline range decreased in the confining pressure loading process, and initial stress enhancement could restrain this trend. Based on the experimental data, the peak strength and permeability coefficient empirical equations for the
K
1
/
J
2
PWR considering confining pressure and CMC were established.</description><identifier>ISSN: 0921-030X</identifier><identifier>EISSN: 1573-0840</identifier><identifier>DOI: 10.1007/s11069-023-05955-6</identifier><language>eng</language><publisher>Dordrecht: Springer Netherlands</publisher><subject>Aquifers ; Axial strain ; Civil Engineering ; Clay minerals ; Coal ; Coal mining ; Coefficient of variation ; Confining ; Cretaceous ; Damage ; Deformation ; Earth and Environmental Science ; Earth Sciences ; Emergency preparedness ; Empirical equations ; Environmental Management ; Evolution ; Geophysics/Geodesy ; Geotechnical Engineering & Applied Earth Sciences ; Hydrogeology ; Initial stresses ; Mining accidents & safety ; Mud ; Natural Hazards ; Nuclear safety ; Original Paper ; Permeability ; Permeability coefficient ; Power law ; Pressure ; Rocks ; Sand ; Strain ; Thermal expansion ; Unconformity ; Unloading</subject><ispartof>Natural hazards (Dordrecht), 2023-07, Vol.117 (3), p.2527-2552</ispartof><rights>The Author(s), under exclusive licence to Springer Nature B.V. 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><cites>FETCH-LOGICAL-c200t-f7a76e2b609f5fb21ec645c3e9220277ccced93f3ae753385e8468563b02807b3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/s11069-023-05955-6$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1007/s11069-023-05955-6$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,776,780,27901,27902,41464,42533,51294</link.rule.ids></links><search><creatorcontrib>Li, Wenping</creatorcontrib><creatorcontrib>Zhu, Tingen</creatorcontrib><creatorcontrib>Wang, Qiqing</creatorcontrib><creatorcontrib>Tian, Jiawei</creatorcontrib><creatorcontrib>Lv, Zhenmeng</creatorcontrib><creatorcontrib>Cheng, Yi</creatorcontrib><title>Experimental study on damage characteristics and permeability evolution of K1/J2 paleoweathered rocks under triaxial unloading-loading confining pressure path</title><title>Natural hazards (Dordrecht)</title><addtitle>Nat Hazards</addtitle><description>Mud-sand inrush accidents in coal mining under extremely thick Cretaceous in Ordos Basin seriously threaten the safety of mine production and miners' life. Paleoweathered rock in the
K
1
/
J
2
unconformity contact zone (
K
1
/
J
2
PWR) of the Ordos basin are key aquifuge under the Cretaceous aquifer and new material source of mud-sand inrush during coal mining. In this paper, the damage characteristics and permeability evolution of
K
1
/
J
2
PWR under triaxial unloading-loading confining pressure path (TULCPP) were studied by MTS8.04 testing machine, which is of great significance for mine disaster prevention and control. Results indicate that in the TULCPP process, with the increase of initial stress and clay mineral content (CMC) of the sample, the peak strength increases, and it is more difficult to expand, as well as the peak volume strain at the expansion point generally increases. The variation trend of permeability coefficient, AE counts and stored counts with axial strain is corresponding to different deformation stages, and it changes dramatically in the pre-peak plastic yield stage, showing a sharp increase trend. The permeability coefficient of
K
1
/
J
2
PWR shows a power-law and negative-exponential relationship with confining pressure. With the increase of initial stress, the relationship will change from power-law to negative-exponential, and this change first occurs in the samples with low CMC. With the increase of CMC, the permeability coefficient increase range expanded in the confining pressure unloading failure process, the permeability coefficient decline range decreased in the confining pressure loading process, and initial stress enhancement could restrain this trend. Based on the experimental data, the peak strength and permeability coefficient empirical equations for the
K
1
/
J
2
PWR considering confining pressure and CMC were established.</description><subject>Aquifers</subject><subject>Axial strain</subject><subject>Civil Engineering</subject><subject>Clay minerals</subject><subject>Coal</subject><subject>Coal mining</subject><subject>Coefficient of variation</subject><subject>Confining</subject><subject>Cretaceous</subject><subject>Damage</subject><subject>Deformation</subject><subject>Earth and Environmental Science</subject><subject>Earth Sciences</subject><subject>Emergency preparedness</subject><subject>Empirical equations</subject><subject>Environmental Management</subject><subject>Evolution</subject><subject>Geophysics/Geodesy</subject><subject>Geotechnical Engineering & Applied Earth Sciences</subject><subject>Hydrogeology</subject><subject>Initial stresses</subject><subject>Mining accidents & safety</subject><subject>Mud</subject><subject>Natural Hazards</subject><subject>Nuclear safety</subject><subject>Original Paper</subject><subject>Permeability</subject><subject>Permeability coefficient</subject><subject>Power law</subject><subject>Pressure</subject><subject>Rocks</subject><subject>Sand</subject><subject>Strain</subject><subject>Thermal expansion</subject><subject>Unconformity</subject><subject>Unloading</subject><issn>0921-030X</issn><issn>1573-0840</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2023</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><recordid>eNp9kc1qHDEQhEWIIRvHL5CTIOeJW9JKmjkG4yT-AV8c8E1oND27cmaliaSJvS-TZ7XsNeTmU3fDV1XQRchnBl8ZgD7NjIHqGuCiAdlJ2ah3ZMWkrme7hvdkBR1nDQi4-0A-5nwPwJji3Yr8O3-cMfkdhmInmssy7GkMdLA7u0HqtjZZVyqQi3eZ2jDQiu_Q9n7yZU_xb5yW4qsijvSKnV5yOtsJ4wPassWEA03R_c50CQMmWpK3j77mLGGKdvBh07xO6mIYfXje5oQ5LwmrUdl-IkejnTKevM5j8uv7-e3Zz-b65sfF2bfrxnGA0ozaaoW8V9CNcuw5Q6fW0gnsOAeutXMOh06MwqKWQrQS27VqpRI98BZ0L47Jl4PvnOKfBXMx93FJoUYa3lZEas1FpfiBcinmnHA0c32dTXvDwDz3YA49mNqDeenBqCoSB1GucNhg-m_9huoJQO-O_Q</recordid><startdate>20230701</startdate><enddate>20230701</enddate><creator>Li, Wenping</creator><creator>Zhu, Tingen</creator><creator>Wang, Qiqing</creator><creator>Tian, Jiawei</creator><creator>Lv, Zhenmeng</creator><creator>Cheng, 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evolution of K1/J2 paleoweathered rocks under triaxial unloading-loading confining pressure path</title><author>Li, Wenping ; Zhu, Tingen ; Wang, Qiqing ; Tian, Jiawei ; Lv, Zhenmeng ; Cheng, Yi</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c200t-f7a76e2b609f5fb21ec645c3e9220277ccced93f3ae753385e8468563b02807b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2023</creationdate><topic>Aquifers</topic><topic>Axial strain</topic><topic>Civil Engineering</topic><topic>Clay minerals</topic><topic>Coal</topic><topic>Coal mining</topic><topic>Coefficient of variation</topic><topic>Confining</topic><topic>Cretaceous</topic><topic>Damage</topic><topic>Deformation</topic><topic>Earth and Environmental Science</topic><topic>Earth Sciences</topic><topic>Emergency preparedness</topic><topic>Empirical equations</topic><topic>Environmental Management</topic><topic>Evolution</topic><topic>Geophysics/Geodesy</topic><topic>Geotechnical Engineering & Applied Earth Sciences</topic><topic>Hydrogeology</topic><topic>Initial stresses</topic><topic>Mining accidents & safety</topic><topic>Mud</topic><topic>Natural Hazards</topic><topic>Nuclear safety</topic><topic>Original Paper</topic><topic>Permeability</topic><topic>Permeability coefficient</topic><topic>Power law</topic><topic>Pressure</topic><topic>Rocks</topic><topic>Sand</topic><topic>Strain</topic><topic>Thermal expansion</topic><topic>Unconformity</topic><topic>Unloading</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Li, Wenping</creatorcontrib><creatorcontrib>Zhu, Tingen</creatorcontrib><creatorcontrib>Wang, Qiqing</creatorcontrib><creatorcontrib>Tian, Jiawei</creatorcontrib><creatorcontrib>Lv, Zhenmeng</creatorcontrib><creatorcontrib>Cheng, Yi</creatorcontrib><collection>CrossRef</collection><collection>ProQuest Central 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unloading-loading confining pressure path</atitle><jtitle>Natural hazards (Dordrecht)</jtitle><stitle>Nat Hazards</stitle><date>2023-07-01</date><risdate>2023</risdate><volume>117</volume><issue>3</issue><spage>2527</spage><epage>2552</epage><pages>2527-2552</pages><issn>0921-030X</issn><eissn>1573-0840</eissn><abstract>Mud-sand inrush accidents in coal mining under extremely thick Cretaceous in Ordos Basin seriously threaten the safety of mine production and miners' life. Paleoweathered rock in the
K
1
/
J
2
unconformity contact zone (
K
1
/
J
2
PWR) of the Ordos basin are key aquifuge under the Cretaceous aquifer and new material source of mud-sand inrush during coal mining. In this paper, the damage characteristics and permeability evolution of
K
1
/
J
2
PWR under triaxial unloading-loading confining pressure path (TULCPP) were studied by MTS8.04 testing machine, which is of great significance for mine disaster prevention and control. Results indicate that in the TULCPP process, with the increase of initial stress and clay mineral content (CMC) of the sample, the peak strength increases, and it is more difficult to expand, as well as the peak volume strain at the expansion point generally increases. The variation trend of permeability coefficient, AE counts and stored counts with axial strain is corresponding to different deformation stages, and it changes dramatically in the pre-peak plastic yield stage, showing a sharp increase trend. The permeability coefficient of
K
1
/
J
2
PWR shows a power-law and negative-exponential relationship with confining pressure. With the increase of initial stress, the relationship will change from power-law to negative-exponential, and this change first occurs in the samples with low CMC. With the increase of CMC, the permeability coefficient increase range expanded in the confining pressure unloading failure process, the permeability coefficient decline range decreased in the confining pressure loading process, and initial stress enhancement could restrain this trend. Based on the experimental data, the peak strength and permeability coefficient empirical equations for the
K
1
/
J
2
PWR considering confining pressure and CMC were established.</abstract><cop>Dordrecht</cop><pub>Springer Netherlands</pub><doi>10.1007/s11069-023-05955-6</doi><tpages>26</tpages></addata></record> |
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| ispartof | Natural hazards (Dordrecht), 2023-07, Vol.117 (3), p.2527-2552 |
| issn | 0921-030X 1573-0840 |
| language | eng |
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| source | Springer Nature - Complete Springer Journals |
| subjects | Aquifers Axial strain Civil Engineering Clay minerals Coal Coal mining Coefficient of variation Confining Cretaceous Damage Deformation Earth and Environmental Science Earth Sciences Emergency preparedness Empirical equations Environmental Management Evolution Geophysics/Geodesy Geotechnical Engineering & Applied Earth Sciences Hydrogeology Initial stresses Mining accidents & safety Mud Natural Hazards Nuclear safety Original Paper Permeability Permeability coefficient Power law Pressure Rocks Sand Strain Thermal expansion Unconformity Unloading |
| title | Experimental study on damage characteristics and permeability evolution of K1/J2 paleoweathered rocks under triaxial unloading-loading confining pressure path |
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