Abstract：With the rapid development of economy in China，the anchorage techniques are applied widely to various kinds of geotechnical reinforcement engineering. Its economical efficiency and advantage have been proved by a lot of engineering practices. But in many reinforcement projects，some unfavourable geological conditions are encountered frequently，such as colluvial soil，residual soil，slope wash，etc.，which result in collapse of borehole and clip of bore rod during drilling of borehole that will bring considerable difficulties to construction and many incipient faults for construction quality. A drilling technique using combined drilling tools is developed via several tests and practices，which well solve the problem about borehole drilling in some strata mentioned above and improve the construction speed. According to the construction of anchor cable in the landslide reinforcement of Badu Station along Nanning—Kunming Railway，some technical measures for construction in unfavourable geological conditions and some technical issues are introduced.
