离石加筋黄土动弹性模量变化规律研究

Change Law of the Dynamic Elastic Modulus of Reinforced Loess in Lishi Area

针对目前加筋土动弹性模量演化机理不明确、测试过程复杂等问题,结合GDS动三轴,开展不同因素(围压、含水率、加筋材料、加筋层数)影响下加筋土动弹性模量测试试验。测试结果表明:(1)加筋土的动弹性模量受含水率、围压、加筋材料和加筋层数等多种因素影响,其影响的敏感性等级为含水率>围压>加筋层数>加筋材料;(2)加筋土的动弹性模量主要受筋材与土颗粒的联结作用和排列方式影响;(3)提出不同因素影响下动弹性模量衰减的预测模型,其表达式符合双曲线规律。研究结论对路基设计、处治具有一定的指导意义。

In view of the unclear evolution mechanism of the dynamic modulus of reinforced soil and the complicated test process,combined with the GDS dynamic triaxial test,this study conducted a dynamic elastic modulus test of reinforced soil under the influence of different factors,i.e.,confining pressure,water content,reinforced materials,and reinforced layers.Three conclusions were drawn:(1)The dynamic elastic modulus of reinforced soil was affected by water content,confining pressure,reinforced materials,and number of reinforced layers,in which the influence order is as follows:water content>confining pressure>number of reinforced layers>reinforced material.(2)The dynamic elastic modulus of reinforced soil is mainly affected by the coupling and arrangement of the reinforced materials and soil particles.(3)This paper proposed a prediction model of dynamic elastic modulus attenuation under the influence of different factors,and its expression conformed to the hyperbolic law.The conclusion has a certain guiding significance for the design and treatment of roadbeds.