土工格栅加筋粘土邓肯-张模型试验参数研究

Research on the Parameters of Duncan-Chang Model for Geogrid-Reinforced Clay

针对广泛应用于土工数值模拟分析中的邓肯-张模型,利用常规三轴压缩试验,对土工格栅加筋粘土的邓肯-张模型参数随含水率和加筋层数的变化规律进行研究。三轴压缩试验中含水率分别为17.5%,20%,22.5%,25%,加筋层为0,1,2层。研究结果表明,模型各参数随含水率和加筋层的变化都表现出一定的规律特征,尤其是含水率对参数c、φ、K、n、D的影响较为明显,可以认为含水率变化是引起土工格栅加筋粘土邓肯-张模型参数动态变化的重要原因;粘土加入土工格栅显著提高了粘土的φ、K、Rf值,在一定程度上说明了土工格栅加筋粘土的加筋效果。

Based on conventional triaxial compression test,as the water content and the number of reinforcement layer of geogrid-reinforced clay changed the change laws of parameters of Duncan-Chang mode which is widely used in the numerical analysis of geotechnical engineering were studied.In the triaxial test,the water content was set as 17.5%,20%,22.5% and 25%,and the number of reinforcement layer was set as 0,1 and 2.The test results and analyses showed that the parameters of Duncan-Chang model varied in certain rules with the water content and number of reinforcement layer,especially,the value of the c,φ,K,nandDevidently varied with the water content.It can be considered that water content is the most important factor to cause the change of the parameters of Duncan-Chang model for geogrid-reinforced clay,the embedding of geogrid into clay can increase the value of c,φ,K,nandD of clay.It is evident that the strength of clay with geo-grid can be increased.