地下洞室监测位移场的反演和围岩稳定评判分析

 针对地下洞室开挖过程中有限的位移监测仪器仅能反映局部围岩变形的情况，提出一种基于整个洞室围岩变形空间场的围岩稳定评判方法。首先通过物理场，对监测数据进行标准化处理，引入监测数据以外的围岩变形信息，然后进行三维空间反演。根据反演结果，运用警戒线法对洞室整体围岩进行评价。该评判方法已成功应用于瀑布沟、溪洛渡等大规模地下洞室的施工开挖围岩稳定分析中。实践表明，该方法能及时反映整个洞室群围岩的变形情况，相对其他数值计算方法能对围岩稳定做出快速、精确、直观的评判。

INVERSION OF MONITORED DISPLACEMENT FIELD AND EVALUATION OF SURROUNDING ROCK STABILITY OF UNDERGROUND CAVERNS

As monitoring instruments only reflect the deformation characteristics of local surrounding rock during the excavation process of underground complexes，an assessment method based on the spatial field of underground complex¢s global deformation is presented. By employing the concept of physical field，the monitoring data can be standardized. Then，the data inversion can be conducted in three-dimensional spaces. According to the inversion results，the warning line method is employed to evaluate the global stability of surrounding rock. The proposed method has been successfully applied to the analysis of surrounding rock stability in a number of large-scale underground complexes，such as Pubugou and Xiluodu projects. These engineering applications indicate that the proposed method can timely reflect the current deformation of underground complex. And comparing with other numerical methods，it is also accurate and effective，which offers a quicker and more direct solution.