CFG桩复合地基变形承载特性的室内试验研究

The Laboratory Test Investigation about Cement Fly-ash Grave Composite Foundation Deformation Bearing Characteristics

室内试验研究表明：CFG桩复合地基的沉降曲线可采用二项式来描述,其系数的相关性很高,由此得出的割线变形模量相比线性段得出的变形模量更为可靠;摩擦型桩在褥垫层厚度100 ～ 300mm范围内调整褥垫层厚度对复合地基桩间土承载能力的发挥有重大的意义,褥垫层厚度对端承桩桩间土承载能力发挥的改善有限,设计时应注重以控制沉降为主.

The laboratory test investigation shows that the settlement curve of Cement Fly - ash Grave composite foundation can be described by binomial whose coefficient dependency is very high, so the modulus of secant deformation is more reliable than that of the linear segment; the adjustment of cushion thickness within 100- 300mm has great importance to the development of soil carrying capacity. The improvement of soil carrying capacity development among end support graves by cushion thickness is limited so sedimentation control shall be paid attention during design.