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| Effect on mechanical properties of backfilling due to pore water pressure |
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Received:February 14, 2020
Revised:February 19, 2020
Accepted:February 25, 2020
Published Online:July 16, 2020
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| DOI： |
| KeyWord:backfilling; pore water pressure; compressive strength; tensile strength; water content |
| Author | Institution |
| Zhu Jianguo |
Changsha Nonferrous Metallurgy Design and Research Institute Co., Ltd.; Hunan Engineering Research Center for safe and efficient mining technology of deep mine |
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| Abstract: |
| In order to explore mechanical properties of backfilling in the mine with great water, backfilling samples are immersed into high water pressure container and pore water pressure is produced in testing samples. The backfilling mechanics and physical properties studied in the paper are included compressive strength, tensile strength and water content. 29 groups of experiment for the studying effect of backfilling strength are obtained, and the effects due to pore water pressure, time, mixture ratio of backfilling and slurry density are considered in experiment. The analysis variance shows that mixture ratio of backfilling and slurry density are very significance to compressive strength which pore water pressure is significance to, but time is significance to tensile strength. The compressive strength and tensile strength of backfilling with the same mixture ratio and slurry density are reduced with increase of pore water pressure and time, and tensile strength reduced significantly. The water content is increased with increase of pore water pressure. The growth trend of water content is consistent with the increasing trend of backfilling strength. |
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