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溪洛渡水电站地下厂房洞室群规模巨大,其中主厂房、尾调室跨度分别达到28.4 m和25 m。通过引进洞周松弛系数函数,提出了新的地下洞室围岩参数反演的计算思路和方法。根据右岸施工现场第1-7级监测数据,对右岸典型剖面的监测资料进行了跟踪反馈及后期开挖预测预报分析,结果表明提出的自动反馈和预测系统可以综合分析现场多点位移计测值,有效实现洞周松弛圈模拟并进行洞周变位和塑性区分布的预测,为实际工程开挖加固提供了重要的参考依据。现有开挖与支护条件下溪洛渡水电站地下厂房围岩整体稳定性良好,加固处理措施有效。
The underground powerhouse of Xiluodu Hydropower Station is large in scale, of which the span of the main workshop and tail transfer room reaches 28.4 m and 25 m respectively. By introducing the relaxation coefficient of the hole circumference, a new calculation method and method for the inversion of surrounding rock parameters of underground caverns are proposed. Based on the monitoring data of 1-7 levels on the right bank construction site, the monitoring data of the typical cross-section of the right bank were tracked and the predictions of late excavation were analyzed. The results show that the proposed automatic feedback and prediction system can comprehensively analyze the multi-site displacement measurements , Effectively simulating the hole relaxation cycle and predicting the displacement of the perimeter and the distribution of the plastic zone provide an important reference for the actual engineering excavation and reinforcement. Under the existing excavation and support conditions, the overall stability of the surrounding rock of the underground powerhouse of Xiluodu Hydropower Station is good, and the reinforcement measures are effective.