多级半正弦动载下加筋砾性土动力特性试验研究
Experimental study on dynamic characteristics of reinforced gravel soil under stepped axial cyclic loading
Received:April 17, 2021  Revised:May 28, 2021
DOI:10.7520/1001-4888-21-093
中文关键词:  砾性土  分级加载  动力特性  加筋土  固结比
英文关键词:gravel soil  stepped axial cyclic loading  dynamic characteristics  reinforced soil  consolidation ratio
基金项目:国家自然科学基金资助项目(41962017);广西自然科学基金资助项目(2017GXNSFAA198170);广西高等学校高水平创新团队及卓越学者计划项目(桂教人才\[2020\]6号);广西研究生教育创新计划项目(YCSW2021310) ;广西大学生创新创业训练计划资助项目(202010594035)
Author NameAffiliation
WANG Jiaquan* College of Civil and Architectural Engineering, Guangxi University of Science and Technology, Liuzhou 545006, Guangxi, China 
ZHU Mengke College of Civil and Architectural Engineering, Guangxi University of Science and Technology, Liuzhou 545006, Guangxi, China 
WANG Qing College of Civil and Architectural Engineering, Guangxi University of Science and Technology, Liuzhou 545006, Guangxi, China 
LIANG Ning College of Civil and Architectural Engineering, Guangxi University of Science and Technology, Liuzhou 545006, Guangxi, China 
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中文摘要:
      为探究加筋层数和固结比对饱和砾性土动力特性的影响,通过一系列分级加载下砾性土动三轴试验,分析了加筋层数和固结比对饱和砾性土轴向累积应变、回弹模量以及体积应变的影响,揭示了多级半正弦动载下加筋砾性土动力特性的变化规律。结果表明:不同加筋层数及固结状态下,随着动应力幅值的增加,轴向累积应变的增长幅度均随之增大。随着加筋层数及固结比的增加,饱和砾性土轴向累积应变、体积应变不断减小,而回弹模量逐渐增大。筋材的加入能够增大土体的整体刚度,从而有效约束土体轴向累积应变、体积应变的发展,但随着加筋层数的增加,单层筋材的加筋效果逐渐减弱。综合考虑轴向累积应变、回弹模量以及体积应变的加筋效果系数,就工程成本和土体性能改善两方面而言,1层加筋效果最佳。
英文摘要:
      In order to explore the influence of the number of reinforced layers and consolidation ratio on the dynamic characteristics of saturated gravelly soil, a series of dynamic triaxial tests of gravelly soil under stepwise loading were carried out to analyze the effect of the number of reinforced layers and consolidation ratio on the axis of saturated gravelly soil. The dynamic characteristics of reinforced gravel soil under multi-level semi-sine dynamic loads are revealed. The result shows: Under different number of stiffened layers and consolidation state, with the increase of dynamic stress amplitude, the growth amplitude of axial cumulative strain increases. As the number of reinforced layers and consolidation ratio increase, the axial cumulative strain and volumetric strain of saturated gravelly soil decrease continuously, while the elastic modulus gradually increases. The addition of reinforcement can increase the overall stiffness of the soil, thereby effectively restraining the development of the axial cumulative strain and volumetric strain of the soil. However, as the number of reinforced layers increases, the effect of single-layer reinforcement gradually weakens. Considering the reinforcement effect coefficients of axial cumulative strain, elastic modulus and volumetric strain comprehensively, it is considered that the first-layer reinforcement effect is the best in terms of engineering cost and soil performance improvement.
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