长期循环荷载下黄泛区黄河泥沙的变形特性及安定性分析  

Deformation and shakedown analysis of river silt under long-term cyclic loads in Yellow River flooding area

作　　者：王钰轲 蒋睿 贾朝军 余翔 钟燕辉[1,3,4] WANG Yuke;JIANG Rui;JIA Chaojun;YU Xiang;ZHONG Yanhui(College of Water Conservancy and Transportation,Zhengzhou University,Zhengzhou 450001,China;School of Civil Engineering,Central South University,Changsha 410075,China;National Local Joint Engineering Laboratory of Major Infrastructure Testing and Rehabilitation Technology,Zhengzhou 450001,China;Collaborative Innovation Center of Water Conservancy and Transportation Infrastructure Safety,Henan Province,Zhengzhou 450001,China)

机构地区：[1]郑州大学水利与交通学院,河南郑州450001 [2]中南大学土木工程学院,湖南长沙410075 [3]重大基础设施检测修复技术国家地方联合工程实验室,河南郑州450001 [4]水利与交通基础设施安全防护河南省协同创新中心,河南郑州450001

出　　处：《铁道科学与工程学报》2024年第5期1866-1875,共10页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(52178369,52109140);河南省优秀青年基金资助项目(232300421069);中原科技创新领军人才资助项目(234200510014);河南省交通运输厅科技项目(2022-5-5)。

摘　　要：随着国家“黄河高质量发展”战略的提出,沿黄工程建设飞速发展,填筑土体材料需求量剧增,建筑资源短缺的问题突显。黄河泥沙作为一种新型工程填料,其资源利用前景被相关部门和研究人员重视。为研究长期循环荷载作用下的黄河泥沙的动力服役特性,选取黄河泥沙典型试样,基于GDS三轴试验系统进行了排水条件下的大周次(10000次)循环三轴试验,结合安定理论系统分析围压、循环应力比、加载频率和密实度对黄河泥沙变形特性的影响,并对黄河泥沙的长期动力稳定性进行研究。研究结果表明:累积应变和回弹应变随着围压的增大而增大,随着频率的升高和密实度的增大而减小,循环应力比较小时,应变累积在加载初期几百次循环内就迅速稳定;随着循环应力比增大,应变的发展逐渐具有蠕变的性质,在5000次循环后仍不断累积;随着循环应力比继续增大,轴向应变将在加载初期迅速增大,泥沙试样在很少的周次内达到破坏状态。通过与代表性的相似土体进行对比,发现黄河泥沙的蠕变性介于粉土和砂砾土之间。基于黄河泥沙的安定性分析,提出了黄河泥沙容许循环应力比的表达式,用以初步判断排水状态下黄河泥沙的长期动力稳定状态。研究结果为泥沙土在实际工程中的进一步应用和推广提供了参数支撑。With the aim of the national strategy of“YB Conservation and Development”and the rapid development of engineering construction along the Yellow River,the demand for filling soil materials increases dramatically,and the problem of shortage of construction resources is highlighted.As a new type of engineering filling material,the resource utilization prospects of Yellow River silt have been valued by relevant departments.To study the dynamic service characteristics of Yellow River silt under long-term cyclic loading,this paper selected typical samples and conducted large cycle(10000 cycles)triaxial tests under drainage condition based on GDS triaxial test system.Combined with shakedown theory,the influence of confining pressure,cyclic stress ratio,loading frequency,and density on the deformation characteristics of Yellow River silt was systematically analyzed.The long-term dynamic stability of the Yellow River silt was studied.The results are shown as follows.The cumulative strain and resilient strain increase with the increase of confining pressure,and decrease with the increase of frequency and density.When the cyclic stress ratio is low,the accumulation of strain quickly reached stability within a few hundred cycles at the initial loading stage.With the increase of cyclic stress ratio,the development of strain gradually exhibits creep properties and continues to accumulate after 5000 cycles.As the cyclic stress ratio continues to increase,the axial strain will rapidly increase in the early stage of loading,and the silt sample will reach failure state in a few cycles.By comparing with representative similar soil,it is found that the creep property of the Yellow River silt is between silty soil and sand.Based on the shakedown analysis of the Yellow River slit,an expression of allowable cyclic stress ratio of Yellow River silt is proposed,which can preliminarily judge the dynamic stability of Yellow River silt in the drainage state.The research results can provide parameter support for the further application a

关 键 词：黄河泥沙 排水条件 循环荷载 变形特性 安定理论 

分 类 号：TU411[建筑科学—岩土工程]