塑料排水板超载预压在斗轮机软基处理中的应用

Application of Plastic Drainage Board and Surcharge Preloading in Soft Clay Ground Treatment with Bucket Wheel Machine

介绍了一个采用塑料排水板超载预压处理不均匀软土地基的工程实例,对地面沉降、深层土体位移、孔隙水压力的变化进行监测和分析。结果表明,各沉降剖面均呈锅底状,上覆压缩层厚度越大,中心点与边侧点沉降差异越大;卸载前沉降变形纵剖面形状与粉质粘土层顶板面形状非常一致;地面沉降变形大的断面,深层土体位移也大;次固结引起的深层土体位移不容忽视;超载预压造成的侧向挤压很大,应设“减挤沟”。

A practical project applying plastic drainage board and surcharge preloading to deal with asymmetry soft clay ground was introduced. Ground settlement, deep ground displacement and changes of pore water pressure were monitored and analyzed. It indicates that all transverse settlement sections appear shape of boiler bottom. The thicker compressed layer is, the bigger settlement differences between center and sides are. The shape of vertical section with settlement deformation is in highly accordance with the shape of top silty clay layer before unloading. Surveyed section with great settlement deformation also has great deep ground displacement. Lateral extrusion induced by surcharge preloading is great, so it is necessary to set up a ditch to reduce extrusion.