Soft Ground Treatment Methods: sand cushion method such as mechanical design and construction, in determining the thickness of sand mats, you should consider the weight of machinery, tire ground contact pressure spray one Jet Drilling Rig, eccentricity and soft ground surface strength and so on. Table 1 shows the standard sand cushion thickness. On the very soft ground, only sand cushion to ensure the passage of large construction machinery often requires thick sand cushion, it is not economical, so often and surface drainage or pad materials and Law. Fill a large area and long distance drainage, groundwater is expected to have multiple triple tube Jet rig exudation, if only as a sand mountain sand cushion, can not obtain sufficient drainage effect, should be used to set the blind ditch, sand cushion inside Drainage should be short not long distance. Sludge Treatment of Soft Rock Tunnel horizontal jet grouting method: the completion of the pre-prepared aqueous slurry fed to the first type drilling Grouting after the end of the first type of drilling equipment, so as drill exiting the first type of drilling and drilling along the first type form a first type of double pipe Jet pile rig from the inside out, completely out of the drill type drilling stopped after the first level Jet grouting, the grouting apparatus is provided in the movable body and jet grouting rig located between the first bracket and the second support bracket, said spray boom apparatus further includes Jet the Jet device comprises adjacent the drill bit set and the spray boom longitudinal axis of the nozzle, and the nozzle is connected to the rear end of the line can be wound, the grouting apparatus slurry through the pipeline will be delivered to the spin spray nozzle means