【摘要】 安哥拉浅部棕红色砂Quelo地层具有湿陷性特征,采用换填垫层进行地基处理后,沉降计算是岩土工程研究最重要的课题。分别对换填垫层、压实地基、天然地基浸水后,通过勘探和原位测试给出了土的物理力学指标,建立锥头阻力与地基反力系数的回归方程,完善随深度变化的沉降计算参数,按照英国标准规定的公式和算例进行沉降计算,假定条形基础与换填垫层组成整体基础并对其可靠性进行验算,从而简化了沉降计算方法,将沉降计算结果与实测沉降量对比分析后,说明沉降计算结果可信并满足设计要求,实体楼的浸水试验也得到了印证,安哥拉砂土地基采用换填垫层法进行地基处理是合理的。更多还原

【Abstract】 The shallow red brown sand Quelo stratum in Angola has the characteristic of collapsibility,and the most important subject of geotechnical engineering research is settlement calculation after foundation treatment by adopting replacement cushion. After immersion of the replacement cushion,compacted foundation and natural foundation,the physical and mechanical indicators of the soil are given through exploration and in-situ test,the regression equation of the cone resistance and foundation reaction force coefficient is established, and the settlement calculation parameters changed with depth are perfected. Settlement calculation is conducted according to the formula and example specified in British Standards. It is assumed that the strip foundation and the replacement cushion constitute the overall foundation,and reliability is checked,so as to simplify the settlement calculation method. Through contrastive analysis of the settlement calculation results and measured settlement amount,it indicates that the settlement calculation results are reliable,and can meet design requirements. The water immersion test of the entity building is also proved,and it is reasonable to adopt replacement cushion method for foundation treatment of Angola sandy soil.更多还原