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本文首先对锦屏一级水电站地下厂房洞室群规模巨大、地质条件复杂、地应力高等不利情况作了简单介绍;由于几乎没有可供借鉴的工程经验,给围岩稳定评价以及加固处理措施的确定提出了极大挑战。系统开展对地下厂房洞室群施工监测与反馈分析研究,是解决上述问题的重要手段。然后简要介绍锦屏一级地下厂房时空双系列反馈分析系统的结构、组成和实现方法。对本项研究提出的初始地应力场分区模拟技术、收敛-增量混合位移目标函数,以及动态松动区模型等新功能开发作较详细介绍。最后介绍反馈分析在锦屏一级水电站地下厂房施工中,对洞室群的开挖顺序、支护参数等进行优化,对洞室群的围岩稳定性进行合理评价和预测预报所起的作用。
In this paper, first of all, a brief introduction is given to the large-scale underground caverns in Jinping First-cascade Hydropower Station with complex geological conditions and high in-situ stress. Since there is hardly any engineering experience available for reference, the stability evaluation of surrounding rock and reinforcement measures Identified a great challenge. It is an important means to solve the above problems by systematically analyzing the construction monitoring and feedback of the underground caverns. Then it briefly introduces the structure, composition and implementation of time-space dual series feedback analysis system of underground powerhouse in Jinping. In this study, the initial geostress field simulation technology proposed, the convergence - incremental mixed displacement objective function, as well as dynamic loosening zone model and other new features for more detailed development. Finally, the feedback analysis is introduced. During the construction of the underground powerhouse of Jinping I Hydropower Station, the excavation sequence and supporting parameters of the cavern group are optimized and the surrounding rock stability of cavern group is reasonably evaluated and predicted. .