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| Research into the compressive constitutive and creep failure properties of brittle rocks under the lateral tension |
| Received:July 11, 2021 Revised:November 29, 2021 |
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| DOI：10.7511/jslx20210711002 |
| KeyWord:rock mechanics lateral tensile stress microcracks stress-strain relation creep failure |
| Author | Institution |
| 李晓照 |
北京建筑大学 土木与交通工程学院, 北京 |
| 车行 |
北京建筑大学 土木与交通工程学院, 北京 |
| 邵珠山 |
西安建筑科技大学 理学院, 西安 |
| 戚承志 |
北京建筑大学 土木与交通工程学院, 北京 |
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| Abstract: |
| The lateral stress strongly influences the mechanical properties of brittle rock under axial compressive loadings,which was widely studied.However,the lateral tensile stress effect on the mechanical properties under axial compression is rarely studied.Based on the conditions of the positive and negative directions of the normal and shear stresses acting on the initial crack surface in the wing crack growth model,the effect of the lateral tensile stress on the axial compressive mechanical behaviors is studied.The normal stress is only the compressive stress and could not be the tensile stress on the initial crack surface in brittle rock under constant lateral tensile stress and the axial progressive compressive stress.The relation between axial stress and wing crack length,the axial stress-strain relation,the peak strength,the crack initiation stress,and the initial elastic modulus are analyzed during the transformation from the lateral compression to the lateral tension.The effects of the lateral stress on the evolutions of the wing crack length,crack velocity,axial strain and strain rate,the creep failure time,and the stationary strain rate during creep are also analyzed.The compressive creep behaviors of rock influenced by stress paths of the sudden change between the lateral tension and compression,and the lateral stepping tension are discussed.The results provide a theoretical help for the stability of surrounding rock in deep underground engineering. |
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