Experimental Investigation on Strength and Deformation Characteristics of Red Sandstone at Strain Rates of 10−2∼55 s−1
The mechanical properties of rocks under low to intermediate strain rate are of great importance for seismic engineering, rock impact, and blasting excavation. To study the strength and deformation characteristics of sandstone subjected to low-medium speed impact loading, the complete stress-strain...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2020-01-01
|
| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2020/8882976 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832555077347311616 |
|---|---|
| author | Jie Shi Zongmu Luo Huachao Liu Dan Wang Haipeng Shen Zeng Li |
| author_facet | Jie Shi Zongmu Luo Huachao Liu Dan Wang Haipeng Shen Zeng Li |
| author_sort | Jie Shi |
| collection | DOAJ |
| description | The mechanical properties of rocks under low to intermediate strain rate are of great importance for seismic engineering, rock impact, and blasting excavation. To study the strength and deformation characteristics of sandstone subjected to low-medium speed impact loading, the complete stress-strain relationships of uniaxial compression at strain rates of 10−2∼55 s−1 were obtained utilizing MTS and drop weight impact test devices. It is indicated that the dynamic compressive strength of sandstone in the range of intermediate strain rate increases approximately linearly with the strain rate under the quasi-static loading condition, while increasing nonlinearly under the dynamic loading condition. The deformation and fracture process of sandstone still consists of pore compaction stage, elastic deformation stage, instable microcrack propagation stage, and brittle fracture stage. The peak stress, critical strain, and residual strain increase with an increase in the strain rate, and the corresponding fracture mode changes from shear failure to split failure. The evolution law of total absorbed strain energy with deformation coincides with that of stored elastic strain energy for sandstone at the intermediate strain rate. The effect of the strain rate on elastic strain energy is more significant than that of dissipated strain energy. Furthermore, both the brittleness and fracture degree of sandstone become more remarkable with the strain rate increasing. |
| format | Article |
| id | doaj-art-d2df529b2faa4ceea540cdeae0d4e799 |
| institution | Kabale University |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-d2df529b2faa4ceea540cdeae0d4e7992025-02-03T05:49:38ZengWileyAdvances in Civil Engineering1687-80861687-80942020-01-01202010.1155/2020/88829768882976Experimental Investigation on Strength and Deformation Characteristics of Red Sandstone at Strain Rates of 10−2∼55 s−1Jie Shi0Zongmu Luo1Huachao Liu2Dan Wang3Haipeng Shen4Zeng Li5National Defense School, Army Engineering University of PLA, Nanjing 210007, ChinaState Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact, Army Engineering University of PLA, Nanjing 210007, ChinaNational Defense School, Army Engineering University of PLA, Nanjing 210007, ChinaNational Defense School, Army Engineering University of PLA, Nanjing 210007, ChinaSchool of Field Engineering, Army Engineering University of PLA, Nanjing 210007, ChinaState Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact, Army Engineering University of PLA, Nanjing 210007, ChinaThe mechanical properties of rocks under low to intermediate strain rate are of great importance for seismic engineering, rock impact, and blasting excavation. To study the strength and deformation characteristics of sandstone subjected to low-medium speed impact loading, the complete stress-strain relationships of uniaxial compression at strain rates of 10−2∼55 s−1 were obtained utilizing MTS and drop weight impact test devices. It is indicated that the dynamic compressive strength of sandstone in the range of intermediate strain rate increases approximately linearly with the strain rate under the quasi-static loading condition, while increasing nonlinearly under the dynamic loading condition. The deformation and fracture process of sandstone still consists of pore compaction stage, elastic deformation stage, instable microcrack propagation stage, and brittle fracture stage. The peak stress, critical strain, and residual strain increase with an increase in the strain rate, and the corresponding fracture mode changes from shear failure to split failure. The evolution law of total absorbed strain energy with deformation coincides with that of stored elastic strain energy for sandstone at the intermediate strain rate. The effect of the strain rate on elastic strain energy is more significant than that of dissipated strain energy. Furthermore, both the brittleness and fracture degree of sandstone become more remarkable with the strain rate increasing.http://dx.doi.org/10.1155/2020/8882976 |
| spellingShingle | Jie Shi Zongmu Luo Huachao Liu Dan Wang Haipeng Shen Zeng Li Experimental Investigation on Strength and Deformation Characteristics of Red Sandstone at Strain Rates of 10−2∼55 s−1 Advances in Civil Engineering |
| title | Experimental Investigation on Strength and Deformation Characteristics of Red Sandstone at Strain Rates of 10−2∼55 s−1 |
| title_full | Experimental Investigation on Strength and Deformation Characteristics of Red Sandstone at Strain Rates of 10−2∼55 s−1 |
| title_fullStr | Experimental Investigation on Strength and Deformation Characteristics of Red Sandstone at Strain Rates of 10−2∼55 s−1 |
| title_full_unstemmed | Experimental Investigation on Strength and Deformation Characteristics of Red Sandstone at Strain Rates of 10−2∼55 s−1 |
| title_short | Experimental Investigation on Strength and Deformation Characteristics of Red Sandstone at Strain Rates of 10−2∼55 s−1 |
| title_sort | experimental investigation on strength and deformation characteristics of red sandstone at strain rates of 10 2∼55 s 1 |
| url | http://dx.doi.org/10.1155/2020/8882976 |
| work_keys_str_mv | AT jieshi experimentalinvestigationonstrengthanddeformationcharacteristicsofredsandstoneatstrainratesof10255s1 AT zongmuluo experimentalinvestigationonstrengthanddeformationcharacteristicsofredsandstoneatstrainratesof10255s1 AT huachaoliu experimentalinvestigationonstrengthanddeformationcharacteristicsofredsandstoneatstrainratesof10255s1 AT danwang experimentalinvestigationonstrengthanddeformationcharacteristicsofredsandstoneatstrainratesof10255s1 AT haipengshen experimentalinvestigationonstrengthanddeformationcharacteristicsofredsandstoneatstrainratesof10255s1 AT zengli experimentalinvestigationonstrengthanddeformationcharacteristicsofredsandstoneatstrainratesof10255s1 |