关键词: 改良土;弱胶结砂岩;水泥;填料

Abstract: In view of the problem of subgrade disease caused by weakly cemented sandstone as filling material,the feasibility of improving weak consolidated sandstone with cement is put forward.By using cement content is 3％,4％,5％,6％,7％,8％,9％ improved weak cementation sand,the modified specimen compaction test,compression test,direct shear test,unconfined compressive strength test,California bearing ratio test.The cement modified weakly consolidated sand as roadbed filler is feasible,and the cement content is 6％,the compression performance of modified filler,shear strength,the age of the unconfined compressive strengthand bearing capacity of road performance are greatly enhanced packing samples,so the cement content for the improvement of 6％ weakly consolidated sand is the most obvious.

Key words: improved soil;weakly cemented sandstone;cement;filling material