长期循环荷载作用下粗粒土变形特性试验研究  

Experimental Study on Deformation Characteristics of Coarse-grained Soil under the Action of Long-term Cyclic Loading

作　　者：王爱爱 张小强 胡小磊 朱永康 WANG Aiai;ZHANG Xiaoqiang;HU Xiaolei;ZHU Yongkang(CCCC Construction Group Co.,Ltd.,Beijing 100088,China;The Southeast Construction Co.,Ltd.of CCCC Construction Group,Xiamen 361100,Fujian,China;School of Civil Engineering,Central South University,Changsha 410075,China)

机构地区：[1]中交建筑集团有限公司,北京100088 [2]中交建筑集团东南建设有限公司,福建厦门361100 [3]中南大学土木工程学院,长沙410075

出　　处：《路基工程》2025年第2期74-78,共5页Subgrade Engineering

摘　　要：采用MTS高频疲劳试验机开展振动循环试验,针对焦平高速公路路基填筑施工现场卵石和碎石两种典型粗粒土填料,分析不同动应力作用下粗粒土填料的塑性变形和弹性变形特性。结果表明:粗粒土的轴向累计应变随循环加载次数呈对数增长,最终的轴向累积应变随着动应力增大呈线性增长;卵石填料更容易发生蠕变且蠕变量更大,碎石填料抵抗塑性变形能力较好,且碎石在长期振动荷载作用下的动弹性模量更为稳定。MTS high frequency fatigue testing machine was used to conduct vibration cycle test and,directing at gravel and crushed stone,the two kinds of typical coarse-grained soil filler on the construction site of subgrade filling along Jiaozuo—Pingdingshan Highway,the characteristics of plastic and elastic deformation of the coarse-grained soil filler under the action of different dynamic stress were analyzed.The result shows that,the axial accumulated strain of the coarse-grained soil increases logarithmically with the number of loading cycles,and the final axial accumulated strain increases linearly with the increase of dynamic stress;the gravel is more prone to creep with larger creep value,thus the gravel is of better capacity to resist to plastic deformation,and of more stable dynamic elastic modulus under the action of long-term vibration load.

关 键 词：路基工程 粗粒土 长期循环荷载 动应力 累积塑性应变 动弹性模量 

分 类 号：U416.12[交通运输工程—道路与铁道工程]