Grouting Treatment of Water and Mud Inrush in Fully Weathered Granite Tunnel: A Case Study

Table 1

The characteristics of the four detection methods.

Name	Theory	Operation process	Advantages	Disadvantages
Transient Electromagnetic Methods	The distribution of groundwater is obtained by observing the secondary field produced by the pulse magnetic field	Transmitting pulse magnetic field-receiving secondary field	It can reflect the overall situation of the front of the face	Easy to be disturbed by metal goods
Water inflow analysis	The groundwater distribution is obtained by observing the water inflow by drilling	Drilling-record water inflow	Direct reflection of formation water	The range is small and the results have occasionality
Borehole investigation	The hole-forming rate of borehole reflects the integrity and stability of surrounding rock	Drilling-check the hole formation of the borehole-record hole formation rate	The operation is simple and the result is intuitive	The range is small and the results have occasionality
P-Q-T method	The curve of pressure and grouting amount in grouting test with time reflects the reinforcement and filling of slurry	Drilling-grouting-record curve	High accuracy and accurate prediction	Complex operation