复合地基褥垫层对桩土应力比的影响研究

从理论上推导了复合地基桩土应力比的计算公式，采用试验和数值计算两种方法，研究褥垫层厚度和模量对桩土应力比的影响，研究结果表明：复合地基桩土应力比随褥垫层的厚度增加而降低，指出褥垫层的合理厚度为200mm～300mm；桩土应力比随褥垫层模量的增大而增大，为防止应力比过大，在工程实践中应合理设置褥垫层的模量。

Influece study of composite foundation cushion on pile-soil stress ratio

Theoretical formula of calculating composite foundation stress ratio is defluced. The effect of cushion thickness and modulus to pilesoil stress ratio is studied with test and numerical calculation. The results show that pile-soil streas ratio increases with cushion modulus de- crease with the increase of cushion thickness, the reasonable cushion thickness of 200 mm--300 mm is point out, and pile-soil stress ratio increases with cushion modulus growth, the proper cushion modulus should be set in practice.