| 水平定向钻隧道地质勘察孔岩屑运移与地层相关性研究 |
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| 引用本文： | 王震,崔景川,彭文波,闫雪峰,马保松,李信杰.水平定向钻隧道地质勘察孔岩屑运移与地层相关性研究[J].地质科技通报,2022,41(6):331-338. |
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| 作者姓名： | 王震 崔景川 彭文波 闫雪峰 马保松 李信杰 |
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| 作者单位： | 1.中国交通建设股份有限公司, 北京 100088 |
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| 基金项目： | 国家自然科学基金青年基金项目42002284新疆维吾尔自治区重大科技专项2020A03003-1 |
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| 摘 要： | 为准确反演勘察孔地层岩性信息、提高岩屑反演勘察孔地层岩性的准确性, 依托某隧道水平定向钻地质勘察项目, 开展了水平定向钻隧道地质勘察孔岩屑运移与地层相关性研究。研究结果表明: 依据岩屑运移速度、费祥俊临界流速理论和Larsen最小返速理论对现场岩屑运移形式的分析, 推知不同围岩岩屑颗粒在水平定向钻孔环空内的运移形式以推移为主, 少部分悬移, 且存在少量岩屑床; 在水平定向钻勘察工程现场, 钻头处产生的地层岩屑最先以悬浮运移状态随泥浆返出; 基于物料输送相关理论分析岩屑颗粒自由悬浮和运动方程, 建立了水平定向钻勘察孔岩屑悬移运移模型; 依托现场碳质板岩和石英片岩相关参数进行了岩屑运移与地层相关性分析, 分别得出完整地层和断层破碎带的岩屑运移孔壁阻力系数, 且断裂带处岩屑运移孔壁阻力系数约为非断裂带处的2.72倍; 得出不同直径钻杆工作范围内的钻孔环空岩屑最终悬浮运移速度, 建立了岩屑运移与地层的关联分析计算模型。研究结果为准确反演勘察孔地层岩性信息, 以及后续隧道的顺利施工提供了理论和数据支持。
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| 关 键 词： | 水平定向钻 隧道地质勘察 岩屑运移 地层反演 |
| 收稿时间： | 2021-06-29 |
Correlation study of cuttings and formation during tunnel geological investigation using HDD technology |
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| Institution: | 1.China Communications Construction Company Limited, Beijing 100088, China2.CCCC Second Highway Consultants Co., Ltd, Wuhan 430056, China3.Faculty of Engineering, China University of Geosciences(Wuhan), Wuhan 430074, China4.School of Civil Engineering, Sun Yat-Sen University, Zhuhai Guangdong 510275, China |
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| Abstract: | To improve the accuracy of formation inversion by cuttings during tunnel geological investigation using horizontal directional drilling technology, this study focuses on the correlation of cutting transportation features and formation spatial locations based on a tunnel geological investigation project. This study mainly draws the following conclusions: The different cuttings' migration modes are determined according to the cutting's migration settling velocity, Fei Xiangjun's critical velocity theory, and Larsen's minimum return velocity theory. The migration of cuttings in the annulus is bedload, a small number of cuttings are suspended load, and the little remaining is cutting's bed. The newly generated cuttings at the drill bit tooface would come out as suspended load first with drilling fluid in the field. The cutting suspended moving mode was established based on the material transportation theory, the freesuspension, and the movement equations of cutting particles. According to the recorded data of carbonaceous slate cuttings and quartz schist cuttings, the resistance coefficient of the intact borehole wall during cutting movement is obtained, while the resistance coefficient of the fault zone is 2.72 times that of the intact zone. Then, the final suspended moving speeds of cuttings in the annulus for Φ140 mm and Φ168 mm drill rods are calculated, and finally, the correlation analysis calculation model for cuttings and formation is established. |
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