岩土力学 ›› 2023, Vol. 44 ›› Issue (S1): 581-592.doi: 10.16285/j.rsm.2022.1360

• 岩土工程研究 • 上一篇    下一篇

三峡库区碎屑岩岸坡岩体钻孔成像特征及质量评价方法研究

孙钱程1, 2，徐晓1, 2，刘圣1, 2，徐志华1, 2，何钰铭3，郭浩森4，张国栋1, 2   

  1. 1.三峡大学 防灾减灾湖北省重点实验室，湖北 宜昌 443002；2.三峡大学 湖北长江三峡滑坡国家野外科学观测研究站, 湖北 宜昌 443002； 3. 湖北省水文地质工程地质勘察院，湖北 宜昌 443000；4. 华东交通大学 江西省防灾减灾与防护重点实验室，江西 南昌 330013；
  • 收稿日期:2022-09-02 接受日期:2023-03-15 出版日期:2023-11-16 发布日期:2023-11-19
  • 通讯作者: 徐志华，男，1987年生，博士，讲师，主要从事岩土工程相关的教学及研究工作。E-mail: zh_xu@ctgu.edu.cn E-mail:qc_sun@ctgu.edu.cn
  • 作者简介:孙钱程，女，1988年生，博士，副教授，主要从事岩土工程相关的教学及研究工作。
  • 基金资助:
    国家自然科学基金（No.51909136）；防灾减灾湖北省重点实验室（三峡大学）开放基金（No. 2022KJZ15）

Borehole imaging characteristics and quality evaluation methods of clastic rock slope in Three Gorges Reservoir area

SUN Qian-cheng1, 2, XU Xiao1, 2, LIU Sheng1, 2, XU Zhi-hua1, 2, HE Yu-ming3, GUO Hao-sen4, ZHANG Guo-dong1. 2   

  1. 1. Hubei Key Laboratory of Disaster Prevention and Mitigation, China Three Gorges University, Yichang, Hubei 443002, China; 2. National Field Observation and Research Station of Landslides in Three Gorges Reservoir Area of Yangtze River, China Three Gorges University, Yichang, Hubei 443002, China; 3. Hubei Hydrogeological Engineering Geological Survey Institute, Yichang, Hubei 443000, China; 4. Jiangxi Key Laboratory of Disaster Prevention-Mitigation and Emergency Management, Nanchang, Jiangxi, 330013, China
  • Received:2022-09-02 Accepted:2023-03-15 Online:2023-11-16 Published:2023-11-19
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51909136) and the Open Research Fund of Hubei Key Laboratory of Disaster Prevention and Mitigation (China Three Gorges University) (2022KJZ15)

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摘要： 三峡库区地层岩性复杂，岩体赋存环境差异性明显，影响岩体质量的因素较多，在周期性水力作用下碎屑岩岸坡岩体已形成独有的结构特征，对岸坡的长期安全与稳定性不利。在调查统计库区碎屑岩特征的基础上，开展了大量原位钻孔测试，分类总结了库区碎屑岩岸坡岩体典型的钻孔成像特点，详细分析了不同裂隙特征岩体钻孔岩芯的块体尺度与断裂特征。基于岩芯断裂特征与钻孔成像裂隙特征的对应关系，建立了岩体质量评价指标RQ，并与传统的岩石质量指标RQD和声波测试结果进行对比，验证了该指标的适用性。研究结果表明，三峡库区碎屑岩库岸影响岩体质量的钻孔成像特征主要有沉积分层结构、软弱充填结构、原生破碎带及钻孔轴向裂隙切割4种结构类型，RQ考虑了不同结构类型划分块体的长度区间，量化了不同区间岩体占比对岩体质量评价值的贡献，基于岩体内部结构特征可以更客观地评价碎屑岩岸坡的岩体质量，避免了钻孔取芯过程机械损伤引入的误差。研究成果有助于分析三峡库区碎屑岩岸坡岩体的质量分布特征，并为岩体质量演化的量化描述提供理论方法与技术思路。

关键词: 三峡库区, 碎屑岩岸坡, 钻孔成像, 岩体特征, 岩体质量评价

Abstract: The lithology of the strata in the Three Gorges Reservoir area is complex, and there is significant difference in the occurrence environment of the rock mass. There are many factors that affect the quality of the rock mass. Under the periodic hydraulic action, the clastic rock bank slope rock mass has formed a unique structural feature, which is unfavorable to the long-term safety and stability of the bank slope. Based on the survey and statistics of the characteristics of clastic rocks in the reservoir area, a large number of in-situ borehole tests were carried out, the typical borehole imaging characteristics of clastic rock of bank slope in the reservoir area were classified and summarized, and the block size and fracture characteristics of borehole cores of rock masses with different fracture characteristics were analyzed in detail. Based on the corresponding relationship between core fracture characteristics and borehole imaging fracture characteristics, the rock mass quality evaluation index RQ is established, and its applicability is verified by comparing with the traditional RQD and acoustic testing results. The research results show that the borehole imaging characteristics affecting the rock mass quality of the clastic rock reservoir bank in the Three Gorges reservoir area mainly include four structural types: sedimentary layered structure, soft filling structure, primary fracture zone and borehole axial fracture cutting. RQ takes into account the different structural types to divide the length zones of blocks, and quantifies the contribution of rock mass ratio in different regions to the rock mass quality evaluation value. Based on the internal structural characteristics of rock mass, the rock mass quality of clastic rock bank slope can be evaluated more objectively, avoiding the error introduced by mechanical damage during drilling and coring. The research results are helpful to analyze the quality distribution characteristics of clastic rock bank slope rock mass in the Three Gorges Reservoir area, and provide a theoretical method and technical idea for quantitative description of rock mass quality evolution.

Key words: Three Gorges Reservoir area, clastic rock bank slope, borehole imaging, rock mass features, rock mass quality evaluation

中图分类号: 

  • TU 451
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