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复杂地质条件下大型地下厂房区域地应力场的影响因素众多,且关系极为复杂,合理的地应力场分析和评价需要工程现场多源信息的综合研究。鉴于此,提出了大型地下厂房区域地应力场多源信息融合分析方法和思路,其典型特征为“基础信息融合-特征信息识别-决策反馈信息融合”3种层次的递进反馈式信息融合分析。依据这一方法和思路,探讨了官地水电站地下厂房区域的地应力场特征及其分布规律。分析认为,与现场开挖过程中所呈现的围岩卸荷破坏信息、监测信息、数值模拟信息以及实测地应力信息对比,均显示了所获得的工程区域初始地应力场是合理的。应用研究表明,所提出的地应力场多源信息融合分析方法是科学的和可行的,其成果为大型地下厂房动态优化设计和信息化施工过程中一系列关键问题提供了决策依据。
Under complex geological conditions, there are many influencing factors of the ground stress field in large-scale underground powerhouse, and the relationship is very complicated. The reasonable geostress field analysis and evaluation need the comprehensive study of multi-source information in the project site. In view of this, the methods and ideas of multi-source information fusion analysis of geo-stress field in large-scale underground powerhouse are proposed. The typical characteristics are three kinds of progressive feedback information of “basic information fusion-feature information identification-decision feedback information fusion” Fusion analysis. Based on this method and thinking, the characteristics and distribution of the geostress field in the underground powerhouse area of Guandi Hydropower Station are discussed. The analysis shows that it is reasonable to compare with the unloading failure information, monitoring information, numerical simulation information and measured geostress information of surrounding rock in the field excavation. All the results show that the initial geostress field of the project area is reasonable. Applied research shows that the proposed method for multi-source information fusion analysis of geostress field is scientific and feasible, and the results provide the basis for decision-making of a series of key issues in the dynamic optimization design and information construction of large-scale underground powerhouse.