| Title |
Effects of DCM Column Properties in Softground on Stabilities of Underground Roadways |
| Keywords |
floating foundation;deep mixing method;soft ground;stiffness ratio;보상기초;심층혼합처리공법;연약지반;강성비 |
| Abstract |
In planning underground roadway foundation on soft ground, deep cement mixing method (DCM) is employed. The proper mixing ratio using batch test and replacement rates that meet strength criteria are used for deep cement mixing column. Stiffness ratio and distance between deep cement mixing columns (C.T.C) are varied to find out influences on stress, displacement, and differential settlement. The replacement ratios that meet settlement criteria are 10~35%. As stiffness varies, stress reaches at 769.㎪ that exceed criteria due to stress concentration when stiffness ratio difference is over 30. Also, when C.T.C is 5 m, stress spreads to soils, so C.T.C need to be considered carefully. The vertical displacement is 0.6~1.56 ㎝, and angular distortion is 1/909~1/510. |