真空渗流场作用下的渗透固结

Infiltrating-concretion in vacuum seepage field

对真空预压法的机理进行研究。研究结果表明:真空预压是真空渗流场作用下的渗透固结,它从顶部抽真空,所产生的真空度在沿竖向排水通道向下传递过程中随深度递减,其作用是在沿各竖向排水通道产生无数动态完整井,并以各完整井为中心产生无数凸面向下的降落漏斗,各降落漏斗即形成真空渗流场。其中土体将以各完整井为中心产生渗透固结,并使整个土体强度得到改善。采用真空预压法有效加固的深度小于动态完整井所能达到的深度、其残余沉降量大于其竖向回弹量。

The vacuum preloading method was studied. The results show that the essentials of the normal vacuum preloading could be considered as infiltrating-concretion in the vacuum seepage field. When making a vacuum on the surface of the ground, the vacuum degree becomes smaller and smaller with transfer going on along the vertical drainage passages, which would develop the vertical drainage passages into dynamic full-wells, and form many pumped funnels around them with the convex surface downwards. All of the pumped funnels form a vacuum seepage field, in which the soft ground is given the infiltrating-concretion around the full-wells and the ground is improved. By the vacuum preloading, the efficient reinforced depth is less than the depth of the dynamic full-wells, and the remained sedimentation is more than the vertical sprang quantity.