Causes Analysis of Excessive Consumption of Tunnel Concrete and Corresponding Measures
The overconsumption rate of concrete in tunnel construction has remained high for a long time,seriously restricting the production profits of enterprises.To effectively control the stubborn problem of excessive concrete consumption in tunnels,the excessive consumption of concrete in the three links of primary support,secondary lining,and invert in the railway and highway industries was compared first based on measured statistical data.The results show that the overconsumption rate of railway secondary linings and inverts is much higher than that of highways,and the overconsumption rate of railway inverts is nearly three times that of highways.The overall overconsumption of tunnel concrete in the highway industry is 34.45%,slightly lower than the 40.62%of tunnel concrete in the railway industry.The reason is differences in industry management standards,overconsumption control awareness,and control levels.Then,the problems existing in the current tunnel concrete over-consumption control in the railway industry was analyzed.Targeted measures were further developed.Finally,three innovative measures were introduced to control excessive consumption of concrete,including adding a tackifier to shotcrete,dynamically adjusting blasting parameters in one cycle and one analysis,dynamically changing the reserved deformation amount for the initial support.The research results can provide a reference for controlling excessive concrete consumption in tunnels.
tunnel constructionexcessive concrete consumptionmeasured statisticscause analysisconstruction control
NETL
NSTL
万方数据
