软土地基上土工织物加筋堤的离心模型试验研究

Centrifugal modeling of reinforced embankments on soft clay

以黄骅港防波堤工程为依托,对有、无土工织物加筋垫层及不同织物加筋条件下堤坝和软土地基的变形与稳定进行了离心模型试验对比研究。得到了地基土体的竖向与水平位移分布规律以及孔隙水压力的消散特性。研究表明:土工织物加筋垫层的加筋机理源于其对土体的侧限效果,铺设土工织物后能有效地减小地基的沉降,并能够限制浅层土体的侧向变形;为使土工织物的加筋效果能够得以充分发挥,要求织物的强度及模量要与垫层的界面强度相匹配。

Three centrifugal model tests, i.e., unreinforced embankment, gauze reinforced embankment, and dacron reinforced embankment, are performed to study the behaviour of embankments on soft clay. Based on these tests, the distributions of the horizontal displacement and vertical displacement as well as the dissipation of the excess pore pressure in the clay foundation are obtained. The reinforcement mechanism of the geotexile is subsequently investigated, with particular emphasis on the effects of the reinforcement strength on the deformation and stability of the subsoil. Centrifuge test results show that the reinforcement can reduce both the settlement and the lateral displacement of the clay foundation, therefore contribute to the improvement the global stability. On the other hand, to guarantee the effectiveness of the reinforcement, the strength and modulus of the geotexile and those of the soil-geotexile interface should be comparable with each other.