Advanced Detection Technology and Application of Double Shield TBM in Lanzhou Water Source
The adaptability of double-shield tunnel boring machine(TBM)to bad geology is poor,such as in the case of sudden mud water,surrounding rock crushing and collapse and other bad geological disasters,it is easy to occur TBM stuck,resulting in construction delay and economic losses.Based on the research background of Lanzhou water source project,combined with the construction characteristics of double shield TBM,the influences of electromagnetic interference,longer shield and segment support were analyzed.The observation system of seismic wave method and resistivity method were improved by using TBM cutterhead holes and segment grouting holes,combined with auxiliary devices,and a comprehensive prediction system suitable for double shield TBM was proposed.The research results show that the comprehensive advanced geological system can better adapt to the construction characteristics of double-shield TBM,and can effectively identify the development of the fractured zone and groundwater in front of it.Combined with field application examples,the feasibility and effectiveness of the method were verified,which can be used as reference for similar projects.
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