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。
Brownish-red(Quelo) sand in Angola has formed for a long time. In low moisture content, the soil has high bearing capacity; but it will reduce largely when meeting water. Ground treatment schemes often have different views. An amount of project practice and special researches prove that, there is a obvious correlation between bearing capacity and moisture content. Through sampling in pit and in-situ tests; the physico-mechanical properties of the soil are identified; through analyzing the cone penetration test(CPT) and plate loading test(PLT) results with different moisture content, a power function relationship between bearing capacity( fak) and moisture content for this soil is built; and a linear empirical formula between bearing capacity( fak) and cone resistance(qc) is given too. CPT results indicate that cone resistance(qc) and side friction resistance( fs) gradually increase with depth;soil is even, but friction-resistance ratio(Rf) is small. According to the analysis, it is high risk taking the non-rolled soil(original soil)as subsoil. For multi-storey and 9-13 storey buildings, using replacement layer of compacted fill is more reasonable than pile foundation.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2014年第S2期332-337,共6页
Rock and Soil Mechanics
关键词
安哥拉
Quelo砂
平板载荷试验
静力触探
含水率
承载力公式
Angola
Quelo sand
plate loading test
static cone penetration test
moisture content
bearing capacity formula
