丹巴水电站石英云母片岩力学特性及岩体质量分类

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摘要按水电行业HC法将丹巴水电站片理状岩体质量分类定为IV类，围岩稳定性差。通过对丹巴石英云母片岩的宏细观力学特性试验，提出石英云母片岩的“似块状”岩体结构，对岩体质量分类进行合理修正。通过单轴压缩试验、不同围压下真三轴试验表明，高应力作用下片岩的各向异性不明显，并通过薄片的细观试验提出丹巴石英云母片岩并非“层状结构”岩体结构，而是“似块状”结构。在此基础上，对丹巴水电站引水隧洞岩体质量分类进行了修正，隧洞围岩以III类为主。最后，通过现场回弹测试、声波检测和变形分析表明，围岩自稳能力强，修正后的分类标准具有良好的适用性。因此，研究不同应力环境下特殊岩石的力学特征对于岩体质量分类具有重要意义，可为同类水电工程围岩分类提供借鉴。

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关键词 ：岩石力学, 岩体质量分类, 围岩稳定性, 力学特征, 片岩, 水电HC法

Abstract：According to HC method applied to hydropower field，quality level of Danba hydropower station schistosity-like rock is classified as IV and the stability of surrounding rock is poor. The massive-like rock structure of quartz mica schist has been proposed by the macro-micro mechanical properties test of Danba quartz mica schist；and rock mass classification method has been modified reasonably. Uniaxial compression test and true triaxial tests under different confining pressures show that the anisotropy of schistosity is not obvious under the high stress. By casting thin meso-test，we find that Danba quartz mica schist is not rock mass structure of“layered structure”，but“massive-like”structure. On this basis，rock mass quality classification of the water diversion tunnel in Danba hydropower station has been modified to classification III. Finally，the self-stability of surrounding rock is favorable through on-site testing，acoustic detection and deformation analysis. And the revised criterion for classification has good applicability. Therefore，it is of great significance for rock mass classification to research rock mechanical characteristics under different stress environments，which can provide a reference for rock classification of similar hydropower engineering.

Key words： rock mechanics classification of rock masses quality stability of surrounding rock mechanical characteristics schist HC method in hydropower project

收稿日期: 2013-05-28

引用本文:

单治钢1，陈国庆2，周春宏1，王家兴2，申玉松2. 丹巴水电站石英云母片岩力学特性及岩体质量分类[J]. 岩石力学与工程学报, 2013, 32(10): 2070-2078.
SHAN Zhigang1，CHEN Guoqing2，ZHOU Chunhong1，WANG Jiaxing2，SHEN Yusong2. MECHANICAL PROPERTIES AND ROCK MASS QUALITY CLASSIFICATION OF QUARTZ MICA SCHIST FOR DANBA HYDROPOWER STATION. , 2013, 32(10): 2070-2078.

链接本文:

http://www.rockmech.org/CN/Y2013/V32/I10/2070

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