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火力发电厂工程桩基础习惯选择可用最深硬土层作为桩端持力层 ,工程实测表明桩基础绝对沉降量基本为桩身压缩变形 ,小于常规天然地基浅基础沉降量 ,且远小于规范要求。另外 ,工程中普遍存在长桩深土层段施工困难、质量不易保证的问题。考虑联合桩基础承台对差异沉降的调节作用 ,充分利用浅层土地基承载力 ,依据沉降计算优选桩端持力层 ,优化桩基础方案 ,可有效减小基桩施工难度 ,降低工程造价。
The foundations of power plant engineering pile foundation can choose the deepest hard layer as the pile bearing layer. The measured results show that the absolute settlement of the pile foundation is basically the compression deformation of the pile body, which is smaller than the conventional shallow foundations of natural foundations. In addition, there are common problems in construction such as difficulty in construction of long piles deep soil section and difficult assurance of quality. Considering the regulation effect of the combined pile foundation cap on the differential settlement, the bearing capacity of the shallow soil foundation is fully used. Based on the settlement calculation and optimization of the pile foundation supporting layer, the pile foundation optimization scheme can be effectively reduced and the project construction cost can be reduced.