Research on control measures for over-excavation and over-consumption in tunnels
The control of over-excavation and over-consumption in tunnels is the most concerned problem in the engineer-ing field in the context of green and low-carbon,and it is of great significance for the cost control and benefit improvement of construction enterprises.Based on the XFS tunnel of Wulong-Liangjiang New Area Expressway,this paper systematical-ly summarizes 10 types of influencing factors and common countermeasures for tunnel over-excavation and over-consump-tion,including surrounding rock conditions,construction parameters,measurement lofting,blasting plans,drilling quali-ty,rebound rate of shotcrete,deformation allowance,material and equipment performance,operator level and on-site con-struction control.The reasons for over-excavation and over-consumption in XFS tunnel are analyzed,and the measures such as strengthening geological prediction and advance support,reducing excavation dimension,dynamically adjust blas-ting plans,strictly inspecting the quality of blast holes;introducing ultra-fine modified silica micro-powder to optimize the mix ratio,improving the level of spraying technology;strengthening on-site construction control,formulating measures of controlling over-excavation and over-consumption,and implementing measures of reward and punishment for operators are formulated.After implementing these measures,the average over-excavation decreased from 30.1 cm to 16.6 cm,and the comprehensive over-consumption decreased from 173.7%to 100.7%in XFS tunnel.
small clear distance separated double hole tunnelover-excavationover-consumptionultra-fine modified silica micro-powder
万方数据
维普
