八渡车站碎石土地层中长锚索施工技术

 随着我国经济建设的飞速发展，各类岩土加固工程中锚固技术的应用日益广泛。大量工程实践已经证明锚固技术的经济性和先进性。但是，锚固工程常遇到各类不良地层(例如塌积、残积、坡积和崩积层等碎石土地层)，在锚固施工的钻孔中由于严重的塌孔、卡钻，给施工带来很大困难，同时也给锚固工程质量带来隐患。通过工程实践和大量试验，研究组合式钻具钻孔方法，较好地解决在上述地层中的成孔问题，提高施工速度。结合南宁—昆明铁路八渡车站的锚索施工，介绍复杂地层中锚固工程施工的技术措施和应注意的有关技术问题。

CONSTRUCTION TECHNIQUES OF LONG ANCHOR CABLE IN GRAVEL SOIL OF BADU STATION

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.