APPLICATION OF FOAM CEMENT IN REGULATING UNEVEN SETTLEMENT ON EXPRESS HIGHWAY WITHOUT BLOCKED ROAD

Generally，since an express highway is built on the soft soil foundation，it cannot meet the requirement of consolidation degree during the construction period，the sedimentation rate is too large，resulting in uneven roadbed settlement after the opening of the highway． To reduce residual settlement of the roadbed transverse holes were used for the roadked and the foamed cement was used． After the disposal of the roadbed，the sedimentation rate stabilized and the residual settlement reduced． Simultaneously，the economic losses caused by disturbing traffic operation were avoided． The laboratory experiments for foamed cement were carried out． Combined the projects，its application in the disposal of the settlement of express highway was introduced． By replacing，the load was reduced from 74. 2 kPa to 69. 8 kPa，the monthly sedimentation rate of test section was reduced by about 50%，the residual settlement of the remaining work was reduced by more than 70%．