Abstract
The excavation of hard rock roadways in coal mines is often in the environment of underground water and high ground temperature, and it is easy to be affected by the dynamic load, which leads to roadway destruction and increases the difficulty of roadway support. The ring sandstone specimens with different inner diameters (0~25 mm) were treated with temperature and water coupled, and the dynamic compression test was produced by the Hopkinson pressure rod device (SHPB). The experimental results indicate that the coupling effect of temperature and water reduces the dynamic performance of sandstone specimens. XRD test results showed that the composition of sandstone specimens did not change before and after warm water coupling, and no new substances were found. Dynamic properties of ring sandstone specimens with different inner diameters weaken with the increase in inner diameters. With the increasing inner diameter of ring sandstone specimens, the energy dissipation per unit volume increases the dynamic compressive strength decreases, and the degree of breakage increases. Fracture morphology, average strain rate, and dynamic peak strain of ring sandstone specimens increase with inner diameter.
Funder
National Natural Science Foundation of China
Anhui University of Science and Technology Graduate Innovation Fund Project
National College Student Innovation and Entrepreneurship Training Program
Subject
Geology,Geotechnical Engineering and Engineering Geology
Reference37 articles.
1. Yuan, L. (2015, December 27). Study on Failure Mechanism and Supporting Technology of Deep Roadway Surrounding Rock. Available online: https://kns.cnki.net/KCMS/detail/detail.aspx?dbname=SNAD&filename=SNAD000001655646.
2. Microseismic multi-parameter characteristics of rockburst hazard induced by hard roof fall and high stress concentration;Lu;Int. J. Rock Mech. Min. Sci.,2015
3. Anatomy of mining-induced fault slip and a triggered rockburst;Lu;Bull. Eng. Geol. Environ.,2019
4. The Dynamic Characteristics of Sandstone after High Temperature Cycle Test Study;Ping;J. Min. Saf. Eng.,2021
5. Experimental Study on Crack Evolution and Damage Characteristics of Water-Bearing Sandstone Under Cyclic Loading;Yang;Rock Soil Mech.,2022