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The unconfined compression strength of red sandstone subgrade filling soil after wetting and drying cycles for 6 times was tested by using a self-designed wettingdrying cycle device with compaction of 93% and 95%, and a cement content of 0~7% (0, 3%, 5% and 7%). According to the test results, the strength evolution law of plain soil, cement-modified red sandstone roadbed filling is analyzed: For plain soil, strength is lost under one cycle of wetting and drying; For cement-modified soil, thedoi:10.12783/dtetr/iccere2017/18299 fatcat:gdnjequ7e5atlcm3zuq7h5edre