真空预压地基最终应力和位移的解析解  

Analytical solution to terminal stress and displacement of foundation under vacuum preloading

作　　者：何良德[1] 宋少华[2] 熊国平[2] 陶东军 刘全 

机构地区：[1]河海大学交通学院海洋学院,江苏南京210098 [2]苏州市高速公路建设指挥部,江苏苏州215007 [3]上海中交水运设计研究有限公司,上海200082

出　　处：《河海大学学报（自然科学版）》2005年第2期194-197,共4页Journal of Hohai University(Natural Sciences)

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.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.

关 键 词：真空预压 非固结渗流 地表沉降 渗透系数 各向异性 

分 类 号：TU473[建筑科学—结构工程]