土工格栅加筋粗粒土的静力本构模型研究

Study on static constitutive model of geogrid reinforced coarse-grained soil

基于分析加筋前后粗粒土的静力大三轴试验结果,研究了加筋前后粗粒土试样强度的变化规律,得出以下结论:加筋能有效地提高粗粒土的强度,随着轴向应变增大,加筋作用越明显,邓肯—张模型能够较好地模拟加筋前后粗粒土应力应变关系,加筋后粗粒土的峰值强度和c值有较大提高,但φ值提高幅度较小。加筋后粗粒土的K和n值均降低了。

Analysis of reinforced and coarse grained soil static triaxial test results based on the variation of coarse grained soil specimen strength before and after reinforcement, draws the following conclusion : reinforcement can effectively improve the strength of the coarse grained soil, with the increase of axial strain, the reinforcement effect is more obvious, the Duncan Chang model can better simulation of the reinforced coarse grained soil stress-strain relationship, reinforced after the peak strength of coarse grained soil and C value increased, but the value was improved significantly. The K and n values of the coarse-grained soil after reinforcement are all decreased.