不同级配特征花岗岩残积土碾压特性研究  

Study on Compaction Characteristics of Residual Soil of Granite under Different Gradations

作　　者：刘清华 翟永红 夏强 陈宾[2] 何嘉雄 徐平 LIU Qinghua;ZHAI Yonghong;XIA Qiang;CHEN Bin;HE Jiaxiong;XU Ping(China Railway Seventh Bureau Group Wuhan Engineering Co.,Ltd.Wuhan 430200,China;Xiangtan University College of Civil Engineering Xiangtan 411105,China)

机构地区：[1]中铁七局集团武汉工程有限公司,武汉430200 [2]湘潭大学土木工程学院,湖南湘潭411105

出　　处：《广东土木与建筑》2025年第1期56-60,共5页Guangdong Architecture Civil Engineering

摘　　要：依托广东省西北部某互通路段,利用离散元对不同级配特征花岗岩残积土的碾压特性进行研究。通过设置细观力学参数,如摩擦系数、刚度、粘滞阻尼系数等,模拟了两种不同级配土样,并分析了其在振动压路机作用下的表面累积沉降率,位移,空隙率等参数的变化情况。研究结果表明,随着碾压遍数的增加,表面累积沉降率逐渐增加并趋于稳定。通过振动完成后的位移云图可以看出位移随深度衰减,并且浅中部以向下的竖向位移为主导,深部以水平位移为主导。空隙率随碾压遍数的增加逐渐减小并趋于稳定。在碾压过程中,滚轮沿深度方向传播的压实能存在应力响应滞后的现象。综上所述比较了两种级配土样的指标变化情况,发现在相同施工参数下振动碾压8遍后,含砂低液限黏土相较于粉质砂土的压实效果更好,并且振动碾压后的影响深度也更大。Based on a certain interchange section in the northwest of Guangdong Province,the rolling characteristics of granite residual soil with different gradation characteristics are studied by using discrete elements.By setting micromechanical parameters,such as friction coefficient,stiffness and viscous damping coefficient,two kinds of soil samples with different levels were simulated,and the changes of surface cumulative settlement rate,displacement and porosity were analyzed under the action of vibratory roller.The results show that with the increase of rolling passes,the cumulative settlement rate of the surface increases gradually and tends to be stable.Through the displacement cloud map after vibration,it can be seen that the displacement decays with depth,and the vertical displacement in the shallow middle is dominated by the downward displacement,and the horizontal displacement in the deep is dominated.The voidage decreases and tends to be stable with the increase of rolling passes.In the rolling process,the compressive energy propagated by the roller along the depth direction has the phenomenon of stress response lag.In summary,the index changes of the two graded soil samples were compared,and it was found that after 8 times of vibration rolling under the same construction parameters,the compaction effect of sand containing low liquid limit clay was better than that of silty sand,and the influence depth after vibration rolling was also greater.

关 键 词：级配 花岗岩残积土 碾压 数值模拟 

分 类 号：U416.1[交通运输工程—道路与铁道工程]