土工格室加固软弱地基模型试验研究

摘要

With the help of physical models and by the means of experimental study ,the paper studies the bearing capacity and the deformation of geocell reinforced-earth foundation,as well as the influence of geocell parameters on the reinforced performance,so as to determine the structure of the foundation.The results indicate that compared with non-reinforced foundation,the reinforced cushion of the geocell will effectively ease the loading on the embankment and other upper structure ,while at the same time,lower the shear strength of the foundation.As a result,the settlemen curve of the weak layer shows a fairly mild pattern;the lateral deformation of the soft foundation has been largely restrained;the resistence against shear strength and the bearing capacity of the foundation soil have been visibly improved .Therefore,it can be concluded that the location of the geocell affects the reinforced performance , and it is recommended that the geocell shall be laid near the top surface of the soft foundation or at a fairly low location above the ground surface,so as to achieve the reinforced effect.The length of the reinforcement does have some effects on the outcome,so the paper suggests that the reinforced structure should be designed within the vertical spreading scope of the additional stress .%通过物理模型试验研究土工格室加筋土地基的承载力、变形特征及加筋格室参数对加固效果的影响，以确定土工格室加固路堤软弱地基的合理结构形式。研究结果表明：与无筋土地基比较，土工格室加筋垫层可以有效地扩散路堤等上部结构的荷载，降低地基中的剪应力，使软弱层的沉降曲线变得比较平缓，也对软弱地基的侧向变形产生了较大的约束作用，提高了地基的抗剪强度，增大了地基承载力；土工格室加筋位置影响地基加固效果，土工格室应布设在靠近软基顶面或地面线以上较低处，以达到较好的加固效果；加筋长度对软基加固效果也有一定影响；设计中宜将加筋布设在竖向附加应力扩散范围之内。