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- Title
不同纤维掺量风积沙水泥基材料 三轴试验研究.
- Authors
雷佳; 程建军; 丁泊淞; 马奔腾; 高丽; 李宇鹏; 程曜森
- Abstract
Aeolian sands, which are abundantly available, widely distributed, and easy to acquire, have been used as construction materials in railway subgrade and sand hazard control projects in desert regions. The physical and mechanical properties of aeolian sand cement-based materials can be improved by adding fibers to satisfy the requirements of engineering services. In order to reveal the stress-strain performance of fiber reinforced aeolian sand cement-based materials under environmental stress and engineering service loads, and evaluate the reinforcement effect of fibers on the aeolian sand cement-based materials, the triaxial tests of polypropylene fiber reinforced aeolian sand cement-based materials were carried out. By changing the amount of fiber and the lateral confining pressure level, the variation law of the characteristic values of the stress-strain curve was analyzed, and the deformation and failure law of the material was explored. The results show that, the angle between the crack development direction and the axial direction during the failure of the specimen gradually transits from 0° to 90° as the confining pressure increases. Compared with the obvious peak point of the stress-strain curve under no confining pressure, the descending section of the stress-strain curve under the combined action of threedimensional stress states becomes slower. When the confining pressure exceeds 15 MPa, the curve rises until the end of the test. With the increase of fiber content, the peak stress of the specimens first increased and then decreased. It reached the maximum when the fiber content was 0.5% and increased by 17.3%~27.4% as compared to the control group without fiber. Based on the above test data, the stress-strain constitutive equation of polypropylene fiber reinforced aeolian sand cement-based material was deduced. The research results in this paper have reference value for the engineering applications of fiber reinforced aeolian sand cement-based materials in desert railway construction.
- Subjects
ENGINEERING services; STRESS-strain curves; POLYPROPYLENE fibers; VALUE engineering; RAILROAD design &; construction; SAND; FIBERS
- Publication
Journal of Railway Science & Engineering, 2023, Vol 20, Issue 2, p587
- ISSN
1672-7029
- Publication type
Article
- DOI
10.19713/j.cnki.43-1423/u.T20220335