动荷载作用下饱和粉土动力特性研究
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摘要
为了分析不同动强度影响因素的动荷载作用下黄河冲洪积粉质土的动应力—动应变发展规律,模拟了一定振动频率的循环荷载的动三轴试验。试验选用郑州市东北部分布广泛的粉土,分析了动应力幅值、循环振动次数、固结围压、固结比等对粉土动力特性的影响,从动应力—动应变关系研究了动荷载作用下粉土的动力特性。试验结果表明:饱和粉土的动应力—动应变的发展与土样的动强度影响因素有关;在循环荷载作用下,因动荷载与围压比值的不同,试样呈现出三种形态;随动荷载作用次数的增加,在同等动应力幅值作用下,试样抵抗外力引起变形的能力越来越差,其弹性模量随振动次数增加而减小、随围压的增加而增大。
In order to analyze the behavior of dynamic stress-strain of the Yellow River wind alluvial silty soil under dynamic load with different dynamic strengths,the dynamic three axis test of cyclic load of certain vibration frequency was carried out in this paper.The silt distributing abroad in the northeast part of Zhengzhou was chosen as research object to analyze the effects of the dynamic stress amplitude,frequency of cyclic vibrations,consolidation confining pressure and consolidation ratio on dynamic characteristics of silt. The dynamic characteristics of silt under vibratory loading were studied by the stress-strain relationship. It is shown that the development of dynamic stress-strain of saturated silt is related with the influence factors of dynamic strength of soil samples.Under cyclic loading,as the different ratio of dynamic load to confining pressure,the specimen presents three forms. With the increase of the number of dynamic loads,the ability of the sample to resist deformation caused by external force under the same dynamic stress amplitude is getting worse. The elastic modulus of the sample decreases with the increase of the number of vibrations and increases with the increase of confining pressure.
In order to analyze the behavior of dynamic stress-strain of the Yellow River wind alluvial silty soil under dynamic load with different dynamic strengths,the dynamic three axis test of cyclic load of certain vibration frequency was carried out in this paper.The silt distributing abroad in the northeast part of Zhengzhou was chosen as research object to analyze the effects of the dynamic stress amplitude,frequency of cyclic vibrations,consolidation confining pressure and consolidation ratio on dynamic characteristics of silt. The dynamic characteristics of silt under vibratory loading were studied by the stress-strain relationship. It is shown that the development of dynamic stress-strain of saturated silt is related with the influence factors of dynamic strength of soil samples.Under cyclic loading,as the different ratio of dynamic load to confining pressure,the specimen presents three forms. With the increase of the number of dynamic loads,the ability of the sample to resist deformation caused by external force under the same dynamic stress amplitude is getting worse. The elastic modulus of the sample decreases with the increase of the number of vibrations and increases with the increase of confining pressure.
引文
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[2]雷华阳,姜岩,陆培毅,等.交通荷载作用下结构性软土动应力-动应变关系试验研究[J].岩石力学与工程学报,2008(增刊1):3052-3057.
[3]蔡正银,陈海军,张桂荣,等.波浪荷载作用下滩海人工岛工程稳定性评价[J].水利学报,2007,38(增刊1):220-225.
[4]赵秀绍,刁心宏,孙瑞民.郑东新区饱和粉土动三轴试验研究[J].路基工程,2009(6):44-46.
[5]张禾.黄泛冲积平原土料的动力参数试验研究[J].人民黄河,2008,30(6):83-84.
[6]徐鹏,骆亚生,李焱,等.双向动荷载下振动频率对黄土动力特性的影响[J].人民长江,2018,49(3):97-101.
[7]丁建宇,王朝亮,杜运国,等.排水条件下阶段性循环荷载作用对饱和软黏土动力特性影响[J].世界地震工程,2017,33(2):161-168.
[8]常世清.弹塑性含水砂性地基-路基系统动力特性分析[J].铁道建筑技术,2016(12):67-72,77.
[9]喻孟初,任青,马荣全.循环荷载作用下土的动力特性及隧道工后沉降分析[J].水资源与水工程学报,2016,27(4):220-224.
[10]GUO Lin,WANG Jun,CAI Yuanqiang,et al.Undrained Deformation Behavior of Saturated Soft Clay Under LongTerm Cyclic Loading[J].Soil Dynamics and Earthquake Engineering,2013,50(1):28-37.
[11]戴文亭,陈星,张弘强.黏性土的动力特性实验及数值模拟[J].吉林大学学报(地球科学版),2008(5):831-836.
[12]张希栋,骆亚生.双向动荷载下黄土的动剪切模量特性研究[J].岩土力学,2015,36(9):2591-2598.
[13]赖夏蕾,简文彬,许旭堂,等.福州淤泥质土动力特性室内试验研究[J].工程地质学报,2016,24(6):1302-1308.
[14]谢琦峰,刘干斌,范思婷,等.循环荷载下饱和重塑黏质粉土的动力特性研究[J].水文地质工程地质,2017,44(1):78-83,90.