双层地基超载预压固结理论及应用 English Version
The consolidation theory and its application to double-layered ground preloaded by surcharge
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摘要: 针对未打穿竖井地基传统固结计算方法的不足 ,将深厚软土未打穿竖井地基合理转化为双层地基 ;分析了双层地基超载预压的固结、沉降机理 ,给出了多级等速加、卸载条件下双层地基一维固结孔压解析解。考虑时间因素的影响 ,提出了反映土结构性的固结沉降计算方法。最后 ,结合工程实例计算 ,发现采用超载预压法处理深厚软土地基 ,对于控制工后沉降是不利的 ;工后沉降主要是下卧层的压缩变形造成的 ,约占工后总沉降的 74%左右。Abstract: Aimed at the drawback of the conventional consolidation analysis method, the ground with partially penetrating sand drain could be viewed as double-layered ground based on the equivalent calculation method.Then the mechanism of consolidation of double-layered ground improved by surcharge preloading method is analyzed, and a method to calculate the excess pore water pressure in the double-layered ground under the condition of staged loading or unloading is deduced. Considering the influence of time factor, a new consolidation calculation method considering the structure character of soil is provided. Finally, the above method is applied in the analysis of a case history, it is found that surcharge preloading method is disadvantageous to reduce the post-construction settlement of deep and thick soft ground and the post-construction settlement is mostly caused by the compressiont of the sub-soil which consists of 74 percent of the total post-construction settlement.
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