安哥拉格埃路砂地层的承载力研究

发布时间：2019-03-11 13:53

【摘要】：安哥拉格埃路地层(Quelo)棕红色砂土形成年代较长,低含水率下地基承载力较高,但遇水后地基承载力降低幅度较大,地基处理方案常有争议。大量的工程实践和专项研究表明,地基土的承载力与含水率有明显的相关性,通过探井取样和原位测试,查明了地基土的物理力学特性,分析不同含水率条件下的静力触探试验(CPT)和平板载荷试验(PLT)数据,建立了适用于该地层的地基承载力与含水率的幂函数关系式以及地基承载力与锥头阻力的线性经验公式。静力触探试验结果表明,地层锥头阻力qc和侧壁摩阻力fs随深度增加而逐渐提高,土质均匀,但摩阻比Rf较小。分析认为,采用不经碾压的砂土作为地基,具有较高的风险;对于多层及9~13层建筑的地基处理,采用换填垫层法较桩基更合理。
[Abstract]:The formation time of (Quelo) brown red sandy soil is long, and the bearing capacity of foundation under low water cut is higher, but the bearing capacity of foundation decreases greatly after water encounters, and the treatment scheme of foundation is often controversial. A large number of engineering practice and special research show that the bearing capacity of foundation soil has obvious correlation with water content. The physical and mechanical properties of foundation soil are found out through well sampling and in-situ testing. The data of static penetration test (CPT) and plate load test (PLT) under different moisture content were analyzed. The power function relation between the bearing capacity of foundation and water cut and the linear empirical formula of bearing capacity of foundation and resistance of cone head are established. The results of static penetration test show that the cone head resistance (qc) and the lateral wall friction (fs) increase gradually with the increase of depth, and the soil quality is uniform, but the friction ratio is smaller than Rf. The analysis shows that the use of uncompacted sand as the foundation has a higher risk, and the replacement cushion method is more reasonable than the pile foundation for the foundation treatment of multi-storey and 9-story 13-storey buildings.
【作者单位】：北京城建勘测设计研究院有限责任公司;北京城建设计发展集团股份有限公司;
【分类号】：TU441.4

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