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延缓固结法(地基延缓固结处理法)是一种通过限制工程运营期间地基的孔隙压力消散来消除后期的地基固结沉降,从而达到控制地基工后沉降目的的新型地基处理方法。通过设置深层水平防渗层完善了延缓固结法,并以此为基础完成该文的研究工作。有限元模拟计算表明,延缓固结法处理的地基工后沉降随帷幕的深度增加而减小,但是当帷幕达到一定深度以后,再增加帷幕的深度,工后沉降不再减小,而竖向防渗帷幕的深度非常小时,延缓固结法反而会使地基工后沉降加大。采用有限元方法比较了分别采用延缓固结法和刚性桩处理地基的超孔压分布、竖向位移场的分布、沉降时程曲线和控制地基工后沉降的效果,且粗略地比较了二者的经济性能。在竖向防渗帷幕的深度适宜的情况下,延缓固结法控制地基工后沉降的作用确实存在。当处理深度在一定范围之内时,延缓固结法和刚性桩相比具有经济和技术双重优势。
Delayed consolidation method (foundation delayed consolidation method) is a new type of foundation treatment method that aims to eliminate the post-ground consolidation settlement by limiting the pore pressure dissipation during foundation operation so as to control the post-construction settlement. Through the establishment of deep horizontal impermeable layer to improve the delay consolidation method, and based on this to complete the research work. Finite element simulation shows that the post-construction settlement decreases with the increase of the depth of the curtain, but when the curtain reaches a certain depth, the depth of the curtain increases and the post-construction settlement no longer decreases. The vertical Impermeable curtain depth is very small, delayed consolidation method but will increase the post-construction settlement. The finite element method was used to compare the distribution of excess pore pressure, the distribution of vertical displacement field, the settlement time history curve and the post-construction settlement effect of the foundation treated with delayed consolidation method and rigid pile respectively, and roughly compared the effects of the two methods Economic performance. In the case of vertical impermeable curtain depth appropriate, postponed consolidation settlement control post-construction settlement does exist. When the treatment depth is within a certain range, it is economical and technical to delay the consolidation method compared with rigid piles.