摘要
针对土体环境温度、应变速率以及含砾量因素对堤防堆筑料土体力学特征的影响,设计开展了室内力学试验对比。试验研究表明,堆筑料试样在愈低的冻结温度下强度愈高,且弹性模量愈大,围压效应可提升堆筑料承载强度,但不改变冻结温度对试样应力应变特征的影响;应变速率愈大,堆筑料强度愈高,速率每增大1个量级,试程在围压100 kPa、300 kPa下的强度可提升24.4%、23.8%,应变速率会改变试样应变变化,低速率下残余应力段应力下降较缓;含砾量愈多,试样强度愈低,此与冻结作用下固态冰的存在有关,虽然含砾量对粗粒土应力应变有明显影响,但在加载应力140.4 kPa前差异性较小,在峰值应力及残余应力段差异性较大,含砾量差异对堆筑料的屈服塑性影响更大。
Indoor mechanical tests were conducted to compare the effects of soil environmental temperature,strain rate,and gravel content on the mechanical characteristics of embankment materials.Experimental studies have shown that the strength and elastic modulus of stacked material specimens are higher at lower freezing temperatures,and the confining pressure effect can improve the bearing strength of stacked materials,but it does not change the influence of freezing temperature on the stress-strain characteristics of the specimens.The higher the strain rate obtained,the higher the strength of the stacked material.For every increase of one order of magnitude in the rate,the strength can be increased by 24.4%and 23.8%under confining pressures of 100kPa and 300kPa.The strain rate will change the strain change of the specimen,and the residual stress in the residual stress section will decrease slowly at low rates.The higher the gravel content,the lower the strength of the sample,which is related to the presence of solid ice under freezing;Although the gravel content has a significant impact on the stress-strain of coarse-grained soil,the difference is small before the loading stress of 140.4kPa,and significant in the peak stress and residual stress sections.The difference in gravel content has a greater impact on the yield plasticity of the stacked material.The paper can provide experimental reference for studying the influencing factors of mechanical characteristics of coarse-grained soil in construction materials.
作者
张文浩
李海洲
孟龙
Zhang Wenhao;Li Haizhou;Meng Long(Jiangsu Huaiyuan Engineering Construction Supervision Co.,Ltd.,Huai an 223001,Jiangsu)
出处
《广东水利水电》
2024年第6期24-28,44,共6页
Guangdong Water Resources and Hydropower
关键词
淮河入海水道
堆筑料
力学
试验
Huai River estuary
Stacking materials
Mechanics
Experiment
作者简介
张文浩(1994-),男,本科,工程师,从事水利工程研究工作。
