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| Research on the Key Technology of Ultra Long Directional Drilling in Railway Tunnel in Mountainous Area |
| XIE Yi1, XU Zhengxuan1, CHEN Minghao1, ZHANG Guangze1, FENG Tao1, WANG Sheng2, WU Jinsheng3 |
1. China Railway Eryuan Engineering Group Co. Ltd, Chengdu, Sichuan 610031, China;
2. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, Sichuan 610059, China;
3. Institute of Exploration Technology, Chinese Academy of Geological Sciences, Chengdu, Sichuan 611734, China |
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Abstract Research purposes: The topographic and geological conditions of the mountainous area railway are extremely complex and changeable, and the engineering geological problems are prominent and hidden. In addition, the traffic is inconvenient, the people are rarely visited, the steep rock strata are widely distributed, the ecological environment is fragile, and the environmental protection requirements are high. Drilling is the most direct, accurate and effective tunnel engineering survey method. The implementation of traditional vertical drilling of railway tunnel is difficult, resulting in the blank of exploration data in long and large sections of tunnel, which seriously restricts the survey and design work, so it is urgent to carry out the research on ultra long directional drilling technology in railway tunnel, especially the key technology of ultra-kilometer horizontal hole rope coring directional drilling.
Research conclusions: (1) The ultra long horizontal hole rope coring directional drilling is an advanced drilling method of taking cores from the drill pipe without lifting the drill pipe string. It is the key technology for the investigation of long, deep buried railway tunnels in complex and dangerous mountainous areas. (2) Through the research on directional drilling methods and technologies, equipment and instruments, and green engineering materials, the directional drilling technology system of super long horizontal hole rope for core in railway tunnel is constructed. (3) The method and process of directional drilling for the core of super long horizontal hole rope in railway tunnel are established, and the longest horizontal hole drilling record in the history of railway survey in China is 1888.88 m. (4) The ultra long horizontal hole rope coring directional drilling technology studied in this paper has a broad application prospect in the Western Development, Transportation Power strategy and the the Belt and Road construction in the new era.
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Received: 20 May 2022
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2022, Vol. 39 
