The Effects of True Triaxial Loading and Unloading Rates on the Damage Mechanical Properties of Sandstone

Man Wang, Weihang Du, Yingwei Wang, Xinjian Li, Liming Qiu, Beichen Yu, Zehua Niu and Dongming Zhang ()
Additional contact information
Man Wang: China Pingmei Shenma Group, State Key Laboratory of Coking Coal Exploitation and Comprehensive Utilization, Pingdingshan 467000, China
Weihang Du: State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400000, China
Yingwei Wang: China Pingmei Shenma Group, State Key Laboratory of Coking Coal Exploitation and Comprehensive Utilization, Pingdingshan 467000, China
Xinjian Li: China Pingmei Shenma Group, State Key Laboratory of Coking Coal Exploitation and Comprehensive Utilization, Pingdingshan 467000, China
Liming Qiu: Key Laboratory of the Ministry of Education for Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing 100083, China
Beichen Yu: State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400000, China
Zehua Niu: China Pingmei Shenma Group, State Key Laboratory of Coking Coal Exploitation and Comprehensive Utilization, Pingdingshan 467000, China
Dongming Zhang: State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400000, China

Sustainability, 2022, vol. 14, issue 19, 1-21

Abstract: Coal is the main energy source in China. In the process of coal resource mining, the surrounding rock of roadways is often in the complex stress environment of “three heights and one disturbance”. At the same time, rocks in the stratum are often in a three-way unequal pressure state under the action of geological structure, and conventional rock mechanics tests cannot study the mechanical properties of rocks under actual stress conditions; thus, this is based on the self-developed true triaxial multifunctional fluid–structure coupling test system to study the damage mechanical Properties of Sandstone. The results are shown as follows: With an increase in loading rate, the peak damage D cr of sandstone decreases, but the initial damage D a increases in the elastic stage, and the brittleness of sandstone weakens. With the increase in the unloading rate, D cr increases, but D a decreases in the elastic stage, and the sandstone brittleness increases first, then decreases. In addition, the peak maximum principal strain ε 1max first decreases rapidly and then slowly; the peak minimum principal strain ε 3max increases first, then decreases slowly, and increases slowly; the peak intermediate principal strain ε 2max decreases slowly; and the peak volume strain ε vmax increases rapidly first and then slowly with increases in the loading rate. With an increase in the unloading rate, ε 1max increases rapidly first, then decreases slowly, then increases rapidly and finally increases slowly; ε 3max first decreases slowly, then increases slowly, and finally decreases slowly; and ε 2max increases slowly then decreases slowly. ε vmax decreases rapidly first and then increases slowly with increasing loading rate.

Keywords: true triaxial; loading and unloading rate; damage; sandstone brittleness (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/2071-1050/14/19/11899/pdf (application/pdf)
https://www.mdpi.com/2071-1050/14/19/11899/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jsusta:v:14:y:2022:i:19:p:11899-:d:920981

Access Statistics for this article

Sustainability is currently edited by Ms. Alexandra Wu

More articles in Sustainability from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().