【摘要】 基于非固结渗流问题的基本方程,导出真空预压地基最终应力和位移的解析解,分析地基在渗流体力和压差面力联合作用下的变形规律,认为地基竖向与水平向渗透系数之比ξ对真空预压的效果有重要影响.ξ值越大,真空度、应力沿深度衰减得越慢,竖向沉降和向内侧的水平位移越大,因此设置竖向排水体可有效增加加固深度,提高加固效果.更多还原

【Abstract】 Based on the equation for unconsolidated seepage, an analytical solution to the terminal stress and displacement of foundation under vacuum preloading was derived. The regularity of foundation displacement under co-action of seepage force and surface pressure difference was analyzed. It is considered that the ratio of vertical permeability coefficient to horizontal permeability coefficient (ξ) is of important influence on the effect of vacuum preloading. The greater the value of ξ is, the slower the attenuation of the vacuum degree and stress along the depth of foundation, and the greater the vertical settlement and the horizontal displacement toward the internal side. Therefore, setting of vertical drainage system can effectively deepen the solidification of foundation and improve the effect of solidification. Finally, the similarity of surface deformation under vacuum preloading and surcharge preloading was discussed.更多还原