关于换填垫层厚度计算的探讨

换填垫层法是处理浅层软弱地基的常见措施之一。《建筑地基处理技术规范》中对换填垫层厚度的计算提出了扩散角法,且认为其结果比按弹性理论计算的结果略偏于安全,由于该方法计算简便,因此在工程中得到广泛得使用。通过建立对比模型和实例研究的方式,分别采用扩散角法和弹性理论法计算换填垫层厚度,结果表明,弹性理论方法较扩散角法所求得的垫层厚度大得多。为满足结构安全,建议对于需计算地基变形的建筑,采用弹性理论方法计算换填垫层厚度。

CALCULATION OF THE THICKNESS OF REPLACED CUSHION

The replaced fill methed is one of the common ways for soft ground treatment.Concerning to calculating of the thickness of a replaced cushion,diffusion angle method is proposed by "Technical Code for Ground Treatment of Buildings".It is said that the result of diffusion angle method is slightly safer than the way of elasticity theory.The diffusion angle method is widely applied in engineering,for its simple and convenient calculation.By building up a comparison model and case study,it is proved that the result of elasticity theory method is much bigger than that of the diffusion angle method.For the sake of safety requirements, it is suggested that the method of elastic theory should be used to calculate the thickness of the replaced cushion for buildings needing calculation of ground deformation.