改进的地基沉降计算的工程方法

Improved settlement calculation method for engineering practice

目前工程实践中的地基沉降计算方法主要依靠的仍是规范中的工程方法,即以压缩模量用于分层总和法计算压缩沉降,再乘以经验系数进行修正,经验系数为0.2~1.4,经验系数差异性大且还不足以修正。为改进其不足提出改进的方法:对于硬土地基,建议采用变形模量用于分层总和法计算沉降,取消经验系数修正,并建议变形模量的经验估算方法;对于饱和软土,在规范方法基础上,建议根据荷载水平或稳定安全系数计算修正经验系数的方法,可以避免因人而异的主观取定,从而为实际工程提供一个简便实用的沉降计算工程方法。案例计算表明其可以有效提高沉降计算的精度。

At present,the calculation method of foundation settlement in engineering mainly depends on the method in the standard.The compression modulus is used to calculate the compression settlement by the stratified sum method,and then multiplied by the empirical coefficient.The empirical coefficient is 0.2–1.4,The coefficient range is too large.In order to solve the problem,new method is proposed.The deformation modulus is proposed for the hard soil foundation instead of the compression modulus,so the empirical coefficient can be canceled.And the empirical method to determine the deformation modulus is proposed.For the saturated soft soil,it is recommended to calculate the correction coefficient based on the load level or the stability safety factor rather than by human experiments.So as to provide a simple and practical engineering settlement calculation method for engineering.Case study shows that it can effectively improve the accuracy of calculation settlement.