Key Technology of Grouting Method for Treatment of Mined-out Area under Rongcheng-Wuhai Highway

Through the project of grouting for treatment of mined-out area under Rongcheng-Wuhai Highway,the key technologies,including bored by grouting,curtain holes and grouting holes grouting,are proposed;and some improving measures thereof are also put forward according to the field terrain and geological conditions.The engineering quality should be ensured by following the inspection method and requirement on the grouting quality as well as the criterion for control of subgrade deformation of highway in the mined-out area.