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基于开挖施工过程,分析计算了开挖卸荷和支护后围岩位移工况及应力分布,并采用有限差分软件FLAC3D对围岩的位移与应力进行了比较,综合评价了洞室在开挖支护后的稳定性。结果表明,开挖卸荷未支护条件下围岩稳定性较差,可能影响开挖施工,及时采取支护措施后围岩的位移场和应力场可得到改善,稳定性提高。可为设计和施工支护提供参考。
Based on the excavation and construction process, the displacement conditions and stress distribution of surrounding rock after excavation unloading and support are analyzed and calculated. The displacement and stress of surrounding rock are compared with finite difference software FLAC3D. After digging support the stability. The results show that the stability of surrounding rock under poor conditions of excavation and unloading is poor, which may affect the excavation construction. The displacement and stress fields of surrounding rock can be improved and the stability is improved after the support measures are adopted in time. For design and construction support for reference.