RESEARCH ON ACCURATE CURTAIN GROUTING CONSTRUCTION AND TREATMENT TECHNOLOGY OF KARST TUNNELS
During the construction of Liangwangshan tunnel of Fuyi expressway,sudden mud-surge water disaster occurred many times,which greatly increased the construction safety risk.In this study,through the on-site disaster research and the comprehensive results of the over-advanced geological prediction,we adopted the accurate curtain grouting technology in the whole section to accurately reinforce the rock body,which accurately guided the subsequent design and construction.The following conclusions are drawn:(1)The geological disaster of the mud-surge section is reflected in the collapse of"multi-layer water-rich,crushed soft rock,steeply dipping fissures,weathering zone",and the collapse space is in the form of a column.(2)In the middle and late stages of grouting,hydrazine sulphate is used,which has better injectability,can effectively control the radius of slurry diffusion,has high solidity rate,and can effectively and precisely reinforce the bottom layer.(3)According to the results of P-Q-t curve analysis,sample drilling inspection and in-hole imaging inspection of the curtain grouting effect,it was concluded that the precise curtain grouting construction was effective,with the strata being strengthened and densified,the amount of water discharged within the design value,and the high rate of slurry consolidation,etc,which was effective,to provide reference for similar projects.
karst tunnelsmud and water surgescurtain groutingsulphur-aluminate cement slurryevaluation of construction treatment effect
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