围护结构变形动态恢复过程对土体内部变形的影响

Influence of Retaining Structure Dynamic Recovery Processon Soil Interior Deformation

为研究围护结构变形动态恢复过程对土体内部变形的影响,采用透明土技术与自行设计的模型试验箱,探究了变形模式、变形过程等因素对坑外土体内部变形的影响规律,并利用粒子图像测速技术综合分析了两种变形模式下不同工况的土体内部变形特征。结果表明:相同变形总量下,在2/3总变形量时进行控制可有效提高坑外土体变形恢复效果;内凸型的残余沉降大于悬臂型,且悬臂型最大水平变形值位置向土体深处发展,而内凸型最大水平变形值位置则向土体浅处发展;在围护结构变形后的动态恢复过程中,恢复阶段前期的恢复效果较好,后续逐渐减弱。

In order to study the influence of dynamic recovery process of retaining structure deformation on the interior deformation of soil,the influence law of deformation mode,deformation process and other factors on the interior deformation of soil outside the pit was explored by using transparent soil technology and self-designed model test box.The interior deformation characteristics of soil under different conditions under two deformation modes were comprehensively analyzed by using particle image velocimetry technology.The results show that:under the same total deformation,the control at 2/3 of the total deformation can effectively improve the recovery effect of soil deformation outside the pit.The residual settlement of the inner convex type is greater than that of the cantilever type,and the cantilever type s maximum horizontal deformation value location develops to the deep of the soil,while the inner convex type s maximum horizontal deformation value location develops to the shallow of the soil.In the dynamic recovery process of retaining structure deformation,the recovery effect is better in the early stage of the recovery stage,and gradually weakens in the subsequent stage.