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在疏浚淤泥中添加固化材料和轻质材料,将其转化为新型土工材料-轻质土,是疏浚淤泥资源化利用的有效方法之一。通过单轴压缩下宏观、细观力学试验,对疏浚淤泥EPS颗粒轻质土试样的变形特性及破坏机理进行了分析。试验结果表明,在荷载作用下,轻质土试样变形破坏具有明显的渐进性特征。渐进性破坏过程包括细观裂纹产生的线弹性变形阶段、细观裂纹稳定扩展的弹塑性变形阶段、细观裂纹整体贯通的破坏阶段。渐进性破坏产生的主要机理在于:一是在EPS颗粒与固化土结合面处局部存在的原生微裂纹;二是固化土胶结强度的逐渐丧失与固化土摩擦强度的逐渐发挥二者不同步。
The dredged silt added curing materials and lightweight materials, to transform it into a new type of geotextile material - light soil, dredged silt is one of the effective ways of resource utilization. Through the macroscopic and micromechanical tests under uniaxial compression, the deformation characteristics and failure mechanism of dredged EPS particle lightweight soil samples were analyzed. The experimental results show that under the action of load, the deformation and failure of light soil samples have obvious gradual characteristics. Progressive failure processes include the stages of linear elastic deformation caused by meso-cracks, the elasto-plastic deformation stage of stable propagation of meso-cracks, and the failure stage of integral crack of mesoscopic cracks. The main mechanism of gradual failure is that the primary microcracks are locally present at the interface between EPS particles and solidified soil; second, the gradual loss of the cemented strength of the solidified soil and the gradual exertion of the frictional strength of the solidified soil do not synchronize.