坝基岩体质量分级影响因素及分级标准

发布时间：2018-05-17 10:38

本文选题：岩石强度 + 岩体结构　；参考：《水利水电技术》2017年10期

【摘要】：对于150 m以上级别的高坝、超高坝,坝基岩体质量分级以及大坝建基面选择对坝基工程处理、大坝体型设计以及坝型坝线比较等,均有决定性的控制作用。就水利水电工程项目而言,目前国内外采用的坝基岩体质量分级方法,主要有RMR分级系统、GSI分级、《工程岩体分级标准》(GB50218—2014)和《水利水电工程地质勘察规范(GB 50487—2008)》的相关标准。大量工程实践表明,影响坝基岩体质量的因素主要是岩石强度、岩体结构和赋存条件。结合新疆某工程坝基岩体质量分级研究,得出影响和制约该工程坝基岩体质量的主要因素为:岩石饱和抗压强度、岩体结构类型以及结构面性状特征(结构面组数、间距及结合程度)、风化与卸荷程度、声波波速、地震波波速、完整性系数、钻孔RQD和地下水状态等;据此,采用定性与定量相结合的方法,制定了坝基岩体质量分级标准。
[Abstract]:For high dams of 150 m or above, super high dams, quality classification of dam foundation rock mass and selection of dam foundation surface, all of them play a decisive role in the treatment of dam foundation engineering, the design of dam shape and the comparison of dam type dam lines. As far as water conservancy and hydropower projects are concerned, the methods of quality classification of dam foundation rock mass adopted at home and abroad at present, There are mainly RMR classification system, GB50218-2014, GB50218-2014 and GB50487-2008). A large number of engineering practices show that the main factors affecting the quality of the dam foundation rock mass are rock strength, rock mass structure and occurrence conditions. Based on the study of rock mass quality classification of a dam foundation in Xinjiang, it is concluded that the main factors influencing and restricting the quality of the dam foundation rock mass are the saturated compressive strength of rock, the type of rock mass structure and the characteristics of structural plane character (number of structural planes). Interval and binding degree, weathering and unloading degree, acoustic wave velocity, seismic wave velocity, integrity coefficient, borehole RQD and groundwater state, etc., based on this, the quality classification standard of dam foundation rock mass is established by combining qualitative and quantitative methods.
【作者单位】：中水北方勘测设计研究有限责任公司;新疆伊犁河流域开发建设管理局;
【分类号】：TV223

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