Method for determining diffusion radius of in-situ injection and remediation of contaminated soil and groundwater

Center-pillared full-face shaft drilling machine

Overwind conveyance drop protection

Method and apparatus for introducing or sinking cavities in rock

Advanced detector system and method using forward three-dimensional induced polarization method for TBM construction tunnel

Shaft construction in the earth and method thereof

METHOD OF DRILLING FROM A SHAFT FOR UNDERGROUND RECOVERY OF HYDROCARBONS

METHOD AND ARRANGEMENT FOR DETECTION AND DESTRUCTION OF TUNNELS

Method of drilling from a shaft for underground recovery of hydrocarbons

Method of constructing underground gallery by using pneumatic transfer system and stratum disposal method