压实度对加筋土竖向变形影响的试验研究

采用两种土工格栅研究了圆柱体加筋土试样在无侧向约束条件下的压缩性能，通过单级加载/卸载的方式测试了压实度为85%，90%和100%的加筋试样的竖向变形规律.试验得到如下结论：1)提高压实度，可以有效增强加筋土抵抗变形的能力，使土体变形更快地进入稳定状态，且土体后期变形速度曲线也更加平缓；2)压实度对加筋土力学性能的影响与加筋材料的拉伸模量、筋土间的有效接触面积有密切的关系，拉伸模量较高的加筋材料对土体的约束更加有效.
Compaction degree is an important factor that affects the mechanical property of reinforced soil. In this paper, two kinds of geogrids were adopted to study the compression performance of cylinder reinforced soil without lateral confinement. Through a single-stage loading/unloading way, the variation rules of vertical deformation for reinforced specimens with the compaction degree of 85%, 90%, and 100% were tested. The following conclusions can be drawn from the present study. 1) Improvement of the compaction degree effectively enhances the soil resistance to deformation, makes the soil deformation stable faster, and makes the velocity curve of deformation more smooth; 2) The impact of compaction degree on the mechanics performance of reinforced soil is closely related to the tensile modulus of reinforced materials and the effective contact area between reinforced materials and soil. Reinforced material with higher tensile modulus provides more effective restrain on the soil.