夹层岩石天然地基的基础设计研究

Design and research on natural foundation design of intercalated rock

现有国家建筑地基基础设计规范对岩石地基有相关定性描述和要求,但是对于夹层岩石天然地基的基础设计,并无相关论述和计算方法.以广东某发电厂夹层岩石天然地基的锅炉基础为设计实例,建立由三维起伏土层地质模型和锅炉基础实体模型组成的土-基础整体有限元模型,建立假定夹层岩石扩散角的简化计算方法,将土-基础整体有限元模型、简化方法的分析结果与后期沉降实测结果进行综合比较,验证了有限元方法和简化方法的正确性,表明这两种方法可推广应用到类似地基的构筑物基础的设计当中,其结论可作为今后我国类似夹层岩石天然地基相关研究和基础设计的借鉴.

The existing national code for design of building foundation has qualitative description and requirement to the rock foundation;but there is no relevant discussion and calculation method for the foundation design of the intercalated rock.Taking the boiler foundation of intercalated rock in a power plant in Guangdong for example,the soil-foundation integral finite element model which combines soil model of 3 D undulating geological and solid model of boiler foundation is established;a simplified calculation method supposing a diffusion angle of intercalated rock is established.The analysis results of the soil-foundation integral finite element model and the simplified method are compared with the measured results;and the correctness of the finite element method and the simplified method are verified.It is shown that these two methods can be applied to the design of similar foundation.The conclusions can be used for reference in the research and foundation design of similar intercalated rock China in the future.