Abstract：Load tests in field are carried out for belt geosynthetic-reinforced gravel layers to study the strength and modulus characteristics of geosynthetic-reinforced foundation on soft soil. The effects are analyzed of numbers of reinforcement layers，distance from footing bottom to top reinforcement layer，interval of reinforcement layers and linear density of reinforcement on the angle of stress spread in foundation. It can be summaried that the angle of stress spread in foundation is obviously increased to larger than 20° after reinforcement by geosynthetic belt. The main affecting factors among above 4 parameters are the numbers of reinforcement layers and interval of reinforcement layers. Thus it is suggested that the angle of stress spread of geosynthetic-reinforced layer may be free from the limit of Chinese Code for Design of Building Foundation(GB50007-2002).
