大岗山水电站位于大渡河中游,为混凝土双曲拱坝,坝高210m。由于河谷狭窄,谷坡高陡,地应力较高,坝基岩体开挖过程中产生了强烈的卸荷松弛。本文基于现场地质环境调查、声波检测,结合声波孔波速值和声波衰减率,分析了开挖卸荷松弛的典型特征及其松弛机理,归纳了卸荷松弛类型。通过分析岩体质量与检测成果在时间、空间上的关系得出了坝基岩体开挖卸荷松弛的时间、空间效应,并对坝基岩体开挖卸荷松弛时空效应与其建造、蚀变及构造的关系进行了地质分析研究。深入研究高拱坝建基岩体开挖松弛工程特性,可为高坝建基面的合理选择、松弛岩体工程处理提供科学依据。
Abstract
The Dagangshan hydropower station is located in the middle reaches of the Dadu River, which is a concrete double curvature arch dam and dam height is 210 M. Because of the narrow valley, steep slopes and high ground stress, rock mass of dam foundation excavation process produces a strong unloading. Based on the field investigation of geological environment, acoustic detection, acoustic wave velocity value and combined with acoustic attenuation rate, the typical characteristics of excavation unloading relaxation and the relaxation mechanism were analyzed, the unloading relaxation type was summarized. Through the analysis of rock mass quality and test results in time and space, the rock mass of dam foundation excavation unloading relaxation time, the space effect, and the rock mass of dam foundation excavation unloading time effect relationship with construction, alteration and structure of geological analysis. Study of high arch dam foundation rock mass excavation engineering characteristics of relaxation can provide a scientific basis for a reasonable choice of surface and relaxation of rock mass engineering treatment.
关键词
高拱坝 /
岩体开挖 /
卸荷松弛 /
时空效应 /
松弛带
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Key words
high arch dam /
rock mass excavation /
unloading relaxation /
spatiotemporal effect /
relaxation zone
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中图分类号：
O317.56
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参考文献
[1] 中国水电顾问集团成都勘测设计研究院.四川省大渡河大岗山水电站可行性研究报告[R].成都,2006. (Chengdu Hydroelectric Investigation and Design Institute. Feasibility study report of Dagangshan Hydropower Station in Dadu River, Sichuan [R]. Chengdu, 2006. (in Chinese))
[2]中国水电顾问集团成都勘测设计研究院.四川省大渡河大岗山水电站建基岩体工程地质条件及评价[R].成都,2011.(Chengdu Hydroelectric Investigation and Design Institute. Engineering geological conditions and evaluation of foundation rock mass of Dagangshan Hydropower Station in Dadu River, Sichuan [R]. Chengdu, 2011. (in Chinese))
[3]陆兆溱.工程地质学[M].北京:中国水利水电出版社,2001.(Lu Zhaozhen. Engineering geology [M]. Beijing: China Water Conservancy and Hydropower Press, 2001 (in Chinese))
[4]蔡斌,朱可俊,刘畅.大岗山水电站坝基岩体表层卸荷松弛带特征分析[J]. 水电站设计, 2014, 30(4):20-23. (Cai Bin,Zhu Kejun, Liu Chang. Analysis of the characteristics of the unloading and relaxation zones in the dam base rock mass of Dagangshan Hydropower Station [J]. Design of Hydroelectric Power Station, 2014, 30(4):20-23. (in Chinese))
[5]赵勇.大渡河大岗山水电站建基岩体开挖卸荷松弛特征研究[D].成都:成都理工大学,2012. (Zhao Yong. Analysis of the characteristics of the unloading and relaxation zones in the dam base rock mass of Dagangshan Hydropower Station [D]. Chengdu: Chengdu University of Technology, 2012. (in Chinese))
[6]冯学敏, 高坝建基面开挖卸荷松弛分析及启示[J]. 水电站设计, 2010, 26(1):1-7. (Feng Xuemin. Analysis of unloading relaxation in the excavation of high dam foundation and the enlightenment [J]. Design of Hydroelectric Power Station,2010,26(1):1-7. (in Chinese))
[7]徐志英. 岩石力学[M]. 北京:水利电力出版社, 1981. (Xu Zhiying. Rock mechanics [M]. Beijing:Water Resources and Electric Power Press,1981. (in Chinese))
[8]陈星,黄坚,冷云,等. 拉剪应力作用下裂隙岩体动态损伤演化[J]. 西北水电, 2010(4):17-20. (Chen Xing,Huang Jian,Leng Yun, et al. Dynamic damage evolution of fractured rock mass under tensile and shear stress [J]. Northwest Hydropower, 2010(4):17-20. (in Chinese))
[9]易毅,汤子坚,张春安. 大岗山水电站坝基岩体表层低波速带成因分析[J]. 人民长江, 2014, 45(22):37-53. (Yi Yi,Tang Zijian,Zhang Chunan. Causal analysis for low wave-velocity zone at dam foundation of Dagangshan Hydropower Station [J]. Yangtze River,2014,45(22):37-53. (in Chinese))
[10]李文纲,王仁坤,贺如平,等. 岩体流变力学特性与工程稳定性[M]. 北京:中国水利水电出版社, 2016. (Li Wengangi,Wang Renkun,He Ruping, et al. Rheological mechanical properties and engineering stability of rock mass [M]. Beijing: China Water Conservancy and Hydropower Press,2016. (in Chinese))
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