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首页> 外文会议>Proceedings of 2009 international symposium on risk control and managment of design, construction and operation in underground engineering >Rockburst Risk Evaluation for Stage Excavation of Underground Powerhouse
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Rockburst Risk Evaluation for Stage Excavation of Underground Powerhouse

机译：地下厂房台阶开挖的岩爆风险评估

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The main powerhouse is the most important one for a hydropower station. It usually located in complex geological environment with high geostress. So that rockburst risk evaluation is very significant for actual construction. Stage excavation is very common in the building of underground powerhouse. It has practical significance to forecast rockburst according to the firstly excavated stage. Numerical simulations were done to analysis the distribution of the secondary stress field in order to evaluate the rockburst risk. The results show that rockburst would occur at the bottom angles of the later stage if rockburst occurred in the earlier stage, and rockburst risk of the sidewall would be weaker. Rockburst would also be weaker in the firstly excavated stage at the same time. Because of stress of the arch increased, support of the arch should be enhanced during the following construction.
机译：主电站是水电站中最重要的。它通常位于地应力较高的复杂地质环境中。因此，岩爆风险评估对于实际施工非常重要。在地下厂房的建筑中，开挖非常普遍。根据开挖阶段对岩爆进行预测具有实际意义。进行了数值模拟，以分析次应力场的分布，以评估岩爆危险。结果表明，如果岩爆发生在较早阶段，则岩爆发生在后期的底角处，而侧壁的岩爆危险性较小。同时，在首次开挖阶段，岩爆也将变弱。由于拱的应力增加，因此在后续施工期间应加强拱的支撑。

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