Directional drilling technology (DDT) originated from oil drilling industry. After many years of development

DDT has been extended to geological investigation and disaster management for tunnel engineering

aquifer reconstruction at the bottom of coal mines

pumping channel construction for power storage stations

municipal pipeline laying and other fields. Combined with the advantages of DDT for long-distance accurate crossing

ground grouting technology can achieve safe and efficient management of underground engineering disasters

and has a broad application prospect. This paper systematically reviews the development history

research status and key technologies of DDT. Firstly

the development history of DDT is introduced. Secondly

the scientific research plan

academic paper publication

relevant patent authorization

and application exploration of DDT are analysed. The analysis results show that the DDT in China has reached an internationally advanced level of technological independence and broad-range application

but there are still some core technical problems that need to be resolved

such as thousand-meter long-distance fast drilling

accurate drilling guidance in complex geological conditions

and accurate grouting in underground engineering. Focusing on the construction requirements of strategic major projects

this paper proposes four functional modules

i.e.

forecasting

drilling

grouting and detecting

and analyses and discusses six aspects of ultra-long directional drilling and grouting (i.e.

sensing prediction while drilling

rapid drilling and sticking prediction

precision guidance technology

remote gel controllable grouting material

pressure stabilizing and controlling sectional grouting process

and detection system with drilling). This paper can provide reference for the development of DDT

and for the prevention and control of disasters in underground engineering.