土工格栅加筋垫层加固软土地基模型试验分析

Analysis of model tests on soft soil subgrade reinforced by geogrid

基于压缩、剪切、拉拔、抗拉试验结果分析了土工格栅加筋土的力学特性。通过室内模型试验研究了加土工格栅和不加土工格栅地基土的侧向位移和竖向位移随深度的变化规律、位移场、应力场、应变场。结果表明,土工格栅加筋垫层能有效地改变和阻止塑性区的形成和发展,对下卧软土地基起到扩散应力、均化应力的作用,控制软土地基塑性变形,增强地基延性和刚度,有效地控制地基竖向位移和侧向位移,增强地基的抗剪强度,增强整个地基的稳定性,提高了加筋土体的承载能力,为实际工程应用提供了可靠的理论依据。

The mechanical characteristics are analysed based on compression test,shear test,tensile test,extraction test of soft soil reinforced by geogrid. Through laboratory model tests, the following studies are performed： the lateral and vertical displacement of the variation with depth,displacement field, stress field, strain field of the foundation reinforced and non-reinforced by geogrid. The results show that it is feasible to change and to resist the formation and development of plastic zone; the influence of reinforced cushion to spread and even up distribute stress of soft soil of substratum, and as well the role of geogrid, to control plastic deformation, to strengthen ductility and stiffness, to decreaselateral and vertical displacements, to strengthen shear strength of soft soil foundation, to improve the stability of the foundation and bearing capacity of reinforced soft soil; the study provides reliable basis for engineering applications.