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针对玄武岩岩体施工期围岩的变形、稳定问题,以一赋存于玄武岩岩体中水电站大型地下厂房为背景,以其三大洞室为研究对象,依据开挖施工期围岩位移监测成果,在对围岩的变形量级、空间分布规律分析的基础上,结合施工进度和地质资料分析围岩位移随时间的发展规律及深部发展规律,最后对施工过程中玄武岩岩体的位移特征进行归纳总结,进而探讨层间、层内错动带对围岩位移的影响。研究结果表明:玄武岩岩体结构面虽然发育,但处于镶嵌紧密状态下,结构面对围岩位移整体影响较小;围岩位移基本在20 mm范围内,15 m深度范围以外的岩体位移呈现弹性状态,变形随深度发展具有连续性,该类岩体可视为均匀介质。施工是变形发展的主要影响因素,随着分层开挖进行,围岩位移呈台阶状上升趋势。
Aiming at the deformation and stability of surrounding rock during the construction of basalt rock mass, taking the three large caverns as the research object, based on a large underground workshop of hydropower station in basalt rock mass, based on the monitoring results of surrounding rock displacement during excavation, Based on the analysis of the deformation magnitude and spatial distribution of surrounding rock, the development law of the displacement of surrounding rock over time and the deep development rule are analyzed based on the construction progress and geological data. Finally, the displacement characteristics of basalt rock mass are summarized In conclusion, the effects of interlayer and intra-layer staggering on the displacement of surrounding rock are discussed. The results show that although the structural plane of basalt rock mass is well developed, the overall displacement of the surrounding rock is less affected by the tight inlaid condition. The displacement of surrounding rock is within 20 mm and the displacement of rock mass outside the depth range of 15 m Elastic state, deformation with the depth of the development of continuity, this type of rock mass can be regarded as a uniform medium. Construction is the main influencing factor of deformation development. As stratified excavation progresses, the displacement of surrounding rock presents a step-like upward trend.