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针对坝基岩体开挖松弛这类特殊岩石力学问题,系统分析研究松弛判据及参数取值、松弛效应的有限元算法等关键技术问题,基于锚固室内试验和现场试验,推导坝基锚固措施对抗剪安全度效应的经验公式,建立一套简明实用的岩体开挖松弛和锚固分析评估有限元算法。以小湾拱坝为背景,得到坝基岩体松弛的时空特征,对比分析2种锚固方案下小湾拱坝的应力和位移、坝基浅部特征截面特征点安全度和锚杆应力等。计算得到应力–应变场结果与现场监测成果符合较好,说明该研究成果的可靠性和实用性,该研究成果已为设计决策提供依据。
Aiming at the special rock mechanics problems such as the relaxation of dam foundation rock mass, the key technical problems such as relaxation criterion, parameter value and finite element algorithm of slack effect are systematically analyzed. Based on the anchorage indoor test and field test, the anchorage measures of dam foundation are deduced Shear safety effect of the empirical formula to establish a set of concise and practical rock excavation relaxation and anchorage analysis and evaluation of finite element method. Based on the Xiaowan arch dam, the relaxation time-space characteristics of the dam foundation rock mass are obtained. The stress and displacement of the Xiaowan arch dam under two kinds of anchorage schemes, the safety of the characteristic points of the shallow section of the dam foundation and the stress of the anchor rod are analyzed. The calculated stress - strain field results are in good agreement with the on-site monitoring results, indicating the reliability and practicability of the research results. The research results have provided the basis for design decision-making.