Aiming at the problems such as shallow hole formation depth in broken strata,collapse in broken zone and diffi-culty in directional drilling during directional drilling construction,the technical scheme of using fixed-point grouting drilling tool combination to construct fixed-point grouting reinforcement in broken formation is proposed,its technical principle is in-troduced,and key technologies such as optimum selection technology of fixed-point grouting position,packer setting and un-sealing technology and grouting technology are developed,and open-hole plugging packer,high-pressure sealing grouting drill pipe and high-pressure water feeder are studied to form a complete set of technology and equipment.We have conduct ground and field tests in Huainan to verify that the setting,blasting and unsealing of the packer can be adjusted and con-trolled.It has completed fixed-point grouting reinforcement in the 6 # borehole along the 1151(3)track of Zhujidong Mine.After the grouting reinforcement,the directional drilling smoothly passes through the broken zone,providing a new technical means for construction of the directional drilling in the broken strata.
维普
万方数据