Study on mechanical properties and microscopic mechanism of fibre-modified subgrade soil under freeze–thaw cycles
Source abstract
Abstract
In order to solve the problem of low freeze-thaw deformation strength of railway road genes in cold regions, railway subgrade soil was improved with polypropylene fibres. The failure mechanism of fibres improved foundation soil is revealed by experiments. The test results showed the following: (1) The strength decreased with the increase in the water content in the melting state and reached its maximum when the water content was 12% in the freezing state. The strength reached the maximum when fibre incorporation was 0.3% and fibre length was 15 mm. (2) The shear strength of the improved subgrade soil gradually decreased and tended to be stable with the increase in the number of freeze–thaw cycles in the frozen state. There was no significant change with the increasing number of freeze–thaw cycles in the thawing state. (3) Before and after the cyclic loading of the fibre-modified subgrade soil, the strength after cyclic loading was greater than that before. (4) Through scanning electron microscopy, the optimal fibre content was determined to be 0.3%. The research results can provide a strong reference for the improvement of railway subgrades, and they have broad application prospects.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Climate change and permafrost · Geotechnical Engineering and Soil Stabilization · Smart Materials for Construction
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Civil and Architectural Engineering, East China University of Technology, Nanchang, People’s Republic of China
College of Civil Engineering and Architecture, Dalian University, Dalian, People’s Republic of China
Funding
Key Research and Development Program of Jiangxi Province · National Natural Science Foundation of China · Jiangxi Province Graduate Innovation Special Fund Project
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