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岩体卸荷分带划分关系到水电工程安全稳定,是影响大坝坝基选择的主要因素之一,对开挖设计具有重要影响。根据国内外岩体卸荷分带研究现状,提出岩体卸荷分带的3个量化指标:每5 m洞段岩体裂隙闭合条数占裂隙总数比例、裂隙开度和纵波速度,并结合工程实例对该量化指标进行论证。根据分析结果得出以下结论:按该类指标划分的结果和野外现场调查分带划分基本一致,对工程区卸荷分带划分具有一定的指导意义,可为工程开挖设计提供依据。
The division of rock mass unloading zoning is related to the safety and stability of hydropower projects, which is one of the main factors affecting dam foundation selection. It has an important influence on excavation design. According to the research status of unloading zoning in rock mass at home and abroad, three quantitative indexes of rock mass unloading zoning are proposed: the ratio of the number of fractures closed to the total number of fractures, the crack opening and the longitudinal wave velocity per 5 m Engineering examples demonstrate the quantitative indicators. According to the results of the analysis, the following conclusions are drawn: The results of such indexes are basically the same as the zonal classification of field investigation, which is of guiding significance for the zoning of unloading zones in the project area, which can provide basis for engineering excavation design.