Effect of Moisture Content on Bursting Liability of Sandstone due to Freeze-Thaw Action
Autor: | Deng Zhang, Chuanxiao Liu, Kesheng Li, Depeng Ma, Maotong Li |
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Rok vydání: | 2020 |
Předmět: |
Materials science
Article Subject Physics QC1-999 Mechanical Engineering 0211 other engineering and technologies Elastic energy Weathering 02 engineering and technology 010502 geochemistry & geophysics Geotechnical Engineering and Engineering Geology Condensed Matter Physics 01 natural sciences Durability Bursting Brittleness Compressive strength Mechanics of Materials Frost Geotechnical engineering Water content 021101 geological & geomatics engineering 0105 earth and related environmental sciences Civil and Structural Engineering |
Zdroj: | Shock and Vibration, Vol 2020 (2020) |
ISSN: | 1875-9203 1070-9622 |
Popis: | Moisture content (MC) and freeze-thaw (F-T) process have an important influence on the mechanical properties of rock and its rockburst tendency in the cold region. In addition, uniaxial compressive strength (UCS) of rock is of great importance in evaluating weathering durability, frost resistance, and bursting liability of rock. In this study, the UCS of rock and bursting liability index of rock including elastic energy index (WET), impact energy index (WCF), elastic strain energy index (ES), and modified values of brittleness index (BIM) were measured by laboratory tests. These tests were implemented in six different MC (0, 0.58, 1.06, 1.82, 2.43, and 2.80%) and 20 F-T cycles. The relationship between rock mechanical properties, bursting liability of rock, and MC after freeze-thaw damage was established, and the control mechanism of moisture content on mechanical properties and rockburst tendency of rocks in cold regions was revealed. Uniaxial compressive test results showed that the UCS of rock decreases significantly with the increase of MC. Under the action of F-T cycles, WET, WCF, and ES decrease with the increase of MC, and BIM of rock increases gradually. This indicates that the rockburst tendency of sandstone decreases with the increase of MC. To calculate WET, WCF, ES, and BIM of sandstone samples, new empirical equations were established and put forward under different MC after 20 F-T cycles. |
Databáze: | OpenAIRE |
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