CDM法加固高桩码头岸坡离心模型试验研究

Centrifugal model test of high-piled wharf slope reinforced by CDM method

高桩码头是码头常用结构型式之一,因其适用于软土地基而在众多河口、海岸地区广泛采用。然而高桩码头在后方软土地基自重及堆载的作用下会产生明显的侧向变形,给码头结构造成严重的损伤。通过离心模型试验研究了采用深层水泥搅拌法(CDM)加固情况下,码头后方在堆载作用下岸坡变形机理、高桩码头承载及变形模式,进而研究加固体对高桩码头岸坡变形的影响。研究结果表明:经CDM加固后,加固体起到了挡土墙的作用,使岸坡水平位移减小,坡顶隆起量增大,但加固体下部侧向膨胀变形增大;综合来看,CDM法加固使高框码头承载力得到显著提高。

High-piled wharf is the most commonly used wharf type in estuary and offshore area, because it is appropriate for soft ground.Under the action of self-weight of the soft ground and loading behind the high-piled wharf, the high-piled wharf will generate obvious lateral displacement, thus the pier structure will be seriously damaged and the safety of the high-piled wharf will also be threatened.Based on a centrifugal model test of wharf structure reinforced by CDM(cement deep mixing) method and without reinforcement, the deformation mechanism of bank slope, displacement pattern and bearing capacity of the high-piled wharf were clear, and the influences of the CDM method on bank slope deformation of the high-piled wharf were studied.The results showed that by using CDM method, the reinforcing body plays a role of retaining wall, thus the horizontal displacement of bank slope decreased and slope top had more heaving deformation, while soil body under the reinforcing body expand laterally.In general, the bearing capacity of the high-piled wharf reinforced by CDM was enhanced observably.