Dynamic Properties of Thermal Shock Treated Sandstone Subjected to Coupled Dynamic and Static Loads
In deep rock engineering, the rock mass can be subjected to thermal stress caused by sudden changes in temperature, which is referred to as thermal shock (TS). To study the effect of TS on heated sandstone, three cooling methods are used to provide different cooling rates. Then the coupled dynamic a...
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doaj-9ee68f3633f344b494db24772d8099052021-08-26T14:06:39ZengMDPI AGMinerals2075-163X2021-08-011188988910.3390/min11080889Dynamic Properties of Thermal Shock Treated Sandstone Subjected to Coupled Dynamic and Static LoadsXiang Li0Si Huang1Tubing Yin2Xibing Li3Kang Peng4Xiaodong Fan5Wengang Dang6Linchong Huang7School of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaSchool of Civil Engineering, Sun Yat-sen University, Zhuhai 519082, ChinaSchool of Aeronautics and Astronautics, Sun Yat-sen University, Shenzhen 518107, ChinaIn deep rock engineering, the rock mass can be subjected to thermal stress caused by sudden changes in temperature, which is referred to as thermal shock (TS). To study the effect of TS on heated sandstone, three cooling methods are used to provide different cooling rates. Then the coupled dynamic and static loading tests are carried out on the heated sandstone by means of a modified split Hopkinson pressure bar (SHPB) system. The test results show that as the heating level increases, the dry density, P-wave velocity, and the dynamic combined strength of the heated sandstone decrease, while specimen porosity increases. Particularly, a sharp change in the physical properties of sandstone can be observed at 650 °C, which is believed to be caused by the α-β transition of quartz at 573 °C. At each heating level of the test, the damage caused by the higher cooling rate to the heated sandstone is more than that caused by the lower cooling rate. The different failure modes of sandstone with increasing temperature are analyzed. The mechanism of TS acting on heated sandstone is discussed, and two typical fracture patterns reflecting the action of TS are identified through SEM.https://www.mdpi.com/2075-163X/11/8/889thermal shockcooling ratecoupled dynamic and static loadsfracture patternssandstone |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Xiang Li Si Huang Tubing Yin Xibing Li Kang Peng Xiaodong Fan Wengang Dang Linchong Huang |
spellingShingle |
Xiang Li Si Huang Tubing Yin Xibing Li Kang Peng Xiaodong Fan Wengang Dang Linchong Huang Dynamic Properties of Thermal Shock Treated Sandstone Subjected to Coupled Dynamic and Static Loads Minerals thermal shock cooling rate coupled dynamic and static loads fracture patterns sandstone |
author_facet |
Xiang Li Si Huang Tubing Yin Xibing Li Kang Peng Xiaodong Fan Wengang Dang Linchong Huang |
author_sort |
Xiang Li |
title |
Dynamic Properties of Thermal Shock Treated Sandstone Subjected to Coupled Dynamic and Static Loads |
title_short |
Dynamic Properties of Thermal Shock Treated Sandstone Subjected to Coupled Dynamic and Static Loads |
title_full |
Dynamic Properties of Thermal Shock Treated Sandstone Subjected to Coupled Dynamic and Static Loads |
title_fullStr |
Dynamic Properties of Thermal Shock Treated Sandstone Subjected to Coupled Dynamic and Static Loads |
title_full_unstemmed |
Dynamic Properties of Thermal Shock Treated Sandstone Subjected to Coupled Dynamic and Static Loads |
title_sort |
dynamic properties of thermal shock treated sandstone subjected to coupled dynamic and static loads |
publisher |
MDPI AG |
series |
Minerals |
issn |
2075-163X |
publishDate |
2021-08-01 |
description |
In deep rock engineering, the rock mass can be subjected to thermal stress caused by sudden changes in temperature, which is referred to as thermal shock (TS). To study the effect of TS on heated sandstone, three cooling methods are used to provide different cooling rates. Then the coupled dynamic and static loading tests are carried out on the heated sandstone by means of a modified split Hopkinson pressure bar (SHPB) system. The test results show that as the heating level increases, the dry density, P-wave velocity, and the dynamic combined strength of the heated sandstone decrease, while specimen porosity increases. Particularly, a sharp change in the physical properties of sandstone can be observed at 650 °C, which is believed to be caused by the α-β transition of quartz at 573 °C. At each heating level of the test, the damage caused by the higher cooling rate to the heated sandstone is more than that caused by the lower cooling rate. The different failure modes of sandstone with increasing temperature are analyzed. The mechanism of TS acting on heated sandstone is discussed, and two typical fracture patterns reflecting the action of TS are identified through SEM. |
topic |
thermal shock cooling rate coupled dynamic and static loads fracture patterns sandstone |
url |
https://www.mdpi.com/2075-163X/11/8/889 |
work_keys_str_mv |
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