宁夏沙坡头水利工程中振动荷载作用下软土地基变形特性研究

Study on Deformation Characteristics of Soft Soil Foundation Under Vibration Load in Shapotou Water Conservancy Project in Ningxia

软土地基的孔隙较大、含水量较高,使得在工程施工中易出现变形问题。本文主要以宁夏沙坡头水利工程为研究目标,首先,对新地基、工后地基、整体软土地基在振动荷载下的沉降进行计算分析;其次,采用弹性半无限空间理论计算工程挖土对地基产生的附加竖向压力,获取软土地基固体部分应力应变关系;再次,对软土地基体变进行修正,确定软土地基变形情况;最后进行实验分析。实验分析发现,振动荷载频率及施工产生的沉降对软土地基具有一定的影响,使软土地基产生一定的变形。

The soft soil foundation has large pore and high water content,which makes it easy to deform.This article mainly takes the Ningxia Shapotou water conservancy project as the research object,first of all,the new foundation,foundation,overall soft soil foundation under dynamic loading settlement is analyzed;secondly,the additional vertical stress calculation of foundation excavation engineering by semi infinite elastic space theory,obtaining solid soft soil foundation of stress-strain relationship again,on the soft land base;variable is modified to determine the soft soil foundation deformation;finally,experimental analysis.The experimental results show that the frequency of vibration load and the settlement caused by construction have certain influence on the soft soil foundation,and make the soft soil foundation produce certain deformation.