摘要
土工格栅作为一种新型的土工合成材料,由于具有高强度、低延伸率等特点而被选作主要的路堤加筋材料,在路堤中适当位置加入土工格栅能有效地减少路堤的沉降和侧向变形。本文采用通用非线性有限元程序ABAQUS分析了加筋前后的路堤底部的竖向位移、堤址点垂线下地基深度的水平位移和地表的水平位移,计算中采用D rucker-Prager模型和C lay p las-tic ity模型模拟土体的非线性,土工格栅采用一维杆单元来模拟。通过对加筋层数、筋材模量、软基模量、填土高度和软土层厚度等影响加筋效果的因素进行对比分析,从计算结果分析可知,路堤加筋虽然对软土地基的竖向位移影响不大,但加筋能有效抑制侧向位移的发展,这样增大了路堤边坡的稳定性,分析结果与大多数实际工程的实测资料相吻合。
Geogirds, a new type of geosynthetics, are used to reduce settlement and lateral displacement of embankment because of their high strength and low elongation. In this paper, a general - purpose non - linear finite element program, ABAQUS, was used to evaluate vertical displacement at the bottom of embankment, horizontal displacements at the embankment toe at depth and ground surface. In the analysis Drucker - Prager model and Clay plasticity model were used to characterize the non - linearity of soil, while one - dimension truss element was used to represent the geogrid. Sensitivity analysis were conducted for factors such as the layer - number of reinforcements, the modulus of geogrids, the modulus of soft clay foundation, the thickness of soft clay foundation and embankment height. The results showed that geogrid reinforcement greatly reduced lateral displacement, but it has less effect on the vertical displacements. Reinforcement can also. improve the embankment stability. The analysis results matched well with observed displacement data.
出处
《工程地质学报》
CSCD
2006年第1期131-137,共7页
Journal of Engineering Geology
关键词
土工格栅
软土
加筋效果
有限元
竖向位移
水平位移
Geogrids, Soft clay, Reinforcement effect, Finite Element, Vertical displacement, Horizontal displacement
