长期动载作用下风积沙低路堤动力响应研究  

Study on Dynamic Response of Aeolian Sand Low Embankment Under Long-term Dynamic Loading

作　　者：刘大鹏[1] 杨晓华[2] 王婧[1] 程强强[1] 刘梦溪[1] LIU Dapeng;YANG Xiaohua;WANG Jing;CHENG Qiangqiang;LIU Mengxi(School of Construction Management,Jiangsu Vocational Institute of Architectural Technology,Xuzhou 221116,China;School of Highway,Chang’an University,Xi’an 710064,China)

机构地区：[1]江苏建筑职业技术学院建筑管理学院,徐州221116 [2]长安大学公路学院,西安710064

出　　处：《武汉理工大学学报（交通科学与工程版）》2023年第4期694-698,704,共6页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国家自然科学基金(52004105);江苏省教育厅自然科学基金重大项目(18KJA560001);徐州市科技计划(KC17156);江苏青蓝工程项目。

摘　　要：文中利用1∶1风积沙低路堤道路结构模型,进行10万次循环荷载作用下风积沙低路堤模型试验,测试了低路堤的动应力和动应变.结果表明:在长期动荷载作用下,风积沙低路堤的动应力随着深度增加非线性衰减且衰减规律受荷载作用次数的影响较小.随着荷载作用次数的增加,低路堤内动应力和动应变均会产生累积效应,荷载作用10万次时风积沙低路堤动应力与初始时刻动应力的比值最大约为1.2,动应变与初始时刻动应变的比值最大约为3.3.基于动应力的累积规律和衰减规律,提出了长期动荷载作用下风积沙低路堤任意深处动应力的计算模型,并通过试验结果验证了计算模型的适用性.Using the 1:1 road structure model of aeolian sand low embankment,the model test of aeolian sand low embankment under 100 thousand cyclic loads was carried out,and the dynamic stress and strain of low embankment were tested.The results show that under the long-term dynamic load,the dynamic stress of aeolian sand low embankment decreases nonlinearly with the increase of depth,and the attenuation law is less affected by the number of loads.With the increase of loading times,both dynamic stress and dynamic strain in low embankment will have cumulative effect.The ratio of dynamic stress to initial dynamic stress of aeolian sand low embankment is about 1.2 and the ratio of dynamic strain to initial dynamic strain is about 3.3 when the loading is 100,000 times.Based on the accumulation law and attenuation law of dynamic stress,a calculation model of dynamic stress at any depth of aeolian sand low embankment under long-term dynamic load is proposed,and the applicability of the calculation model is verified by test results.

关 键 词：风积沙低路堤 模型试验 长期动载 动力响应 计算模型 

分 类 号：U416.1[交通运输工程—道路与铁道工程]