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国家自然科学基金(51378057)

作品数:16 被引量:105H指数:7
相关作者:刘建坤崔宏环张立群王青志李仲玉更多>>
相关机构:北京交通大学河北建筑工程学院青海省交通科学研究院更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划张家口市科学技术研究与发展计划项目更多>>
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16 条 记 录,以下是 1-10
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冻融循环对粉质黏土力学性质的影响及邓肯-张模型被引量:9
2018年
为了描述冻融循环下压实黏性土不排水剪切性状的变化规律,建议了一种能够反映冻融循环影响的修正邓肯-张模型。首先,以青藏高原粉质黏土为对象,进行一系列冻融循环试验和常规不固结不排水三轴压缩试验。然后,基于邓肯-张双曲线模型,通过三轴压缩试验得到应力-应变关系,确定邓肯-张双曲线模型参数随冻融循环次数的变化规律及相应的回归关系。最后,根据模型参数的函数表达式,建立以冻融循环次数为影响因子的修正邓肯-张模型,并编制该修正模型的计算程序。结果表明:粉质黏土试样的应力-应变曲线形式基本呈应变硬化型,破坏强度随冻融循环次数的增加而逐渐减小,冻融循环劣化作用随围压的增加而逐渐减弱;模型参数中,抗剪强度指标、初始切线模量、极限偏应力和常数K均随着冻融循环次数的增加呈逐渐减小的变化规律,可以采用Logistic函数进行拟合;破坏比随着冻融循环次数的增加呈逐渐增大的变化规律,可以采用ExpAssoc函数进行拟合;常数n随着冻融循环次数的增加呈先减小、后增大的变化规律,可以采用三次多项式函数进行拟合;模型计算结果与试验结果对比表明,两者得到的应力-应变曲线基本吻合,说明该模型可以用来描述粉质黏土变形和强度特性在冻融循环下的劣化特征。
胡田飞刘建坤常丹常丹徐安花
关键词:粉质黏土三轴试验冻融循环
季节性冻土区光伏支架螺旋桩抗冻拔试验研究(英文)被引量:6
2016年
目的:基于相似性原理,模拟实际工况中的降温冻结过程;通过室内试验确定最优桩型,并推导冻拔量与冻深的定量关系。创新点:1.进行季节性冻土区螺旋桩的自由冻胀试验;2.根据相似性原理,在室内试验过程中调整冷端温度与几何尺寸以缩短冻结时间;3.推导得到6种桩型冻拔量与冻结深度的定量关系。方法:1.通过相似性原理确定试验条件,模拟实际工况中的降温冻结过程;2.观测此过程中5种螺旋桩型的温度场、冻拔量和土压力随时间的变化规律,并设置一组光滑桩作为对比;3.根据冻拔量大小选取最优桩型,并推导冻拔量与冻深的定量关系。结论:1.螺旋桩冻拔量小于光滑桩,验证了螺旋桩抗冻拔的有效性;采用不同土样有相同规律。2.冻深达到0.9 m的季冻区,双螺旋大叶片桩抗冻拔效果最好;螺旋叶片建议设置在非冻区;冻拔量大小关系为:双螺旋大叶片桩<半螺旋大叶片桩<半螺旋小叶片桩<双螺旋小叶片桩<全螺旋桩<光滑桩。3.得到6种桩型冻拔量与冻深的线性关系。4.土中水开始冻结时土压力增大,含冰量稳定后土压力变化很小。
Teng-fei WANGJian-kun LIUHua-gang ZHAOYa-long SHANGXiao-qiang LIU
关键词:螺旋桩冻胀冻拔
冻融循环后路基粉质黏土动力特性研究被引量:4
2017年
冻融循环作用对路基土的动力特性有着较大的影响。本文以张家口地区路基粉质黏土为例,通过进行冻融循环作用下的室内动三轴试验,得到了路基土动强度、动内摩擦角、动粘聚力等参数随冻融循环次数的变化规律,探究了冻融循环作用对路基土动力特性的影响。试验结果表明,在冻融循环条件下,土体的动强度、动粘聚力呈现明显下降趋势,经历7次冻融循环后,其值趋于稳定;动内摩擦角在某一范围内波动,虽具有一定的下降趋势,但规律性并不明显。
马玉涛崔宏环刘建坤程卫星
关键词:冻融循环动三轴试验动力特性
寒区路基改良土冻融循环与荷载耦合作用下损伤力学研究被引量:20
2016年
以路基改良土作为研究对象,研究其在冻融受载耦合条件下的损伤演化规律.土体在冻融循环条件下的受载损伤,就可以等效为土体在2种加载下的损伤.以寒区路基工程为背景,考虑冻融与荷载的耦合作用,通过室内试验,研究了冻融循环作用下路基改良填料的强度和变形特性,在此基础上探索改良土路基内部土体发生在细观层次上的损伤形态和演化过程,建立冻融受载损伤模型.
崔宏环刘建坤张立群李仲玉
关键词:冻融循环本构关系路基改良土
Direct shear tests of coarse-grained fillings from high-speed railway subgrade in cold regions
2017年
In order to study the shear behavior of coarse-grained fillings taken from the subgrade bottom layer of a cold region high-speed railway,large scale direct shear tests were conducted with different normal pressures,water contents and temperatures.The results indicate that the relationship between shear displacement and shear stress changed from strain-softening at lower normal pressures to strain-hardening at higher normal pressures,in both unfrozen and frozen states.This phenomenon was mainly due to the shear dilatation deformation effect.The shear displacement-shear stress curves show similar stages.Besides,the shear stress rapidly increased and there was not an increment in the shear displacement during the initial stage of the shear process in the frozen state.In both the unfrozen or frozen states at the same water contents,the shear strength increased with increasing normal pressure.
Qing Zhi WangJian Kun LiuJian Hong FangAn Hua Xu
关键词:COARSE-GRAINEDSCALESHEARCURVESHEARSTRENGTH
冲积扇粉质黏土路基在交通荷载作用下的沉降变形影响因素分析被引量:9
2018年
通过对张家口地区冲积扇粉质黏土进行动力学三轴试验以及对路基模型进行动力学有限元分析,引入敏感性数据分析方法对引起路基在交通荷载作用下发生沉降的各因素进行量化分析,得到结论如下:(1)由动力学试验可知,动应力幅值对土体动弹性模量衰减影响最大,敏感性数值达到了1.6左右,围压对于动弹性模量的衰化影响较小,敏感性数值为0.6左右,频率对于土体动模量衰化影响最弱,只有0.2;(2)数值分析计算可知,接地应力对于路基沉降影响较大,敏感性数值达到0.8左右,路堤高度影响较弱为0.2,行车速度变化对于路基沉降几乎没有影响,敏感性数值只有0.08。结合两者分析结果可得:车重是影响路基沉降最主要的因素,填土高度影响较弱,车速对于路基沉降几乎没有影响。
崔宏环王志阳
关键词:路基交通荷载沉降
Experimental study of the dynamic behavior of high-grade highway-subgrade soil in a seasonally frozen area被引量:1
2017年
Regarding the freezing damage of high-grade highway subgrade in seasonally frozen area,the thesis explores the effect on the dynamic behavior of subgrade soil under freeze–thaw cycles and draws the change law of parameters(including dynamic strength,dynamic cohesion,and internal friction angle;and dynamic elastic modulus)of high-grade highway-subgrade soil with the number of freeze–thaw cycles.It aims to provide the reference for operation and maintenance of a high-grade highway.Conclusions:(1)Dynamic strength tends to decline evidently after freeze–thaw cycles,with 60%~70%decline after three cycles,and remains stable after five to seven cycles.(2)With the number of freeze–thaw cycles increasing,the internal friction angle fluctuates within a certain range without an obvious change law,only presenting the tendency of dropping off.The dynamic cohesion declines obviously,about 20%~40%after seven freeze–thaw cycles,and then tends to be stable.(3)With the number of freeze-thaw cycles increasing,the dynamic elastic modulus and maximum dynamic elastic modulus are inclined to decrease distinctly.After five freeze–thaw cycles,the former declines 30%~40%and then remains stable.Meanwhile,the latter falls 20%~40%.
Hong Huan CuiYu Tao MaJian Kun LiuZhi Yang Wang
关键词:FROZENFREEZE-THAWDYNAMICDYNAMICTRIAXIALHIGH-GRADE
高温冻土区XPS保温板路基的冻土上限计算模型(英文)被引量:5
2017年
为揭示青藏高原东部高温冻土区高速公路XPS保温板路基的人为冻土上限退化规律,确保高温冻土区路基的长期热稳定性,减小因人为冻土上限退化引起的路基病害,首先,利用现场地温实测资料分析高温冻土区XPS保温板路基地温的纵、横向分布特征,以及路基修筑初期人为冻土上限的退化特征;然后,采用非饱和土渗流与热传导理论求解冻土水热耦合微分方程,实现冻土水分场与温度场的全耦合,进而将水热耦合模型模拟所得温度场与现场实测温度场进行比较,以验证该模型的正确性;并分析XPS保温板路基在5种工况(包括填料类型、年平均地温、路基高度、XPS保温板铺设位置和气候变暖)下人为冻土上限的退化规律;最后,采用MATLAB分析影响人为冻土上限退化主要因素,进而对其进行多元线性回归,建立高温冻土区XPS保温板路基人为冻土上限计算模型。研究结果表明:XPS保温板路基左侧一定范围内温度比右侧对应范围的温度高;路基修筑初期人为冻土上限先抬升60cm,然后以10cm/年下降,冻土上限的变化导致深部冻土层存在一定幅度的升温;5种工况条件下,路基人为冻土上限与时间均呈线性增加关系;影响人为冻土上限退化的2个主要影响因素为填料类型和气候变暖;该模型可为今后开展高温冻土区高速公路XPS保温板路基长期变形预测与病害防治提供技术参考。
邰博文刘建坤房建宏徐安花刘磊王腾飞
关键词:道路工程
Experimental study of the effects of non-uniformly distributed fine soil on mechanical properties of Shenyang–Dandong Railway coarse-grained soil
2015年
The stress produced by repeated train loads decreases with increasing railway subgrade bed depth, and slightly weathered coarse particles of subgrade bed fillings can be broken at different levels under continuous load. Thus, the mass of fine soil, with a diameter of not more than 0.075 mm, is different at different depths. Fine soil is also sensitive to frost heave and thaw settlement. In order to study the effects of non-uniformly distributed fine soil on the mechanical properties of coarse-grained soil of the Shenyang-Dandong Railway, triaxial tests were conducted with three types of specimens, un- dergoing six freeze-thaw cycle numbers (0, 1, 3, 7, 9, 12) and three confining pressures (100, 200, 300 kPa). The freezing temperature is -5 ~C and the thawing temperature is +15 ~C. The stress-strain behavior, static strength, resilient modulus, cohesive force and the angle of internal friction were measured for different tested specimens. As a result, the law of static strength and resilient modulus of different specimens following the increase of freeze-thaw cycles under three confining pressures is obtained. The changing law of cohesive force and friction angle of three specimens following the increase of freeze-thaw cycles is also calculated, and the different results of different specimens are also compared.
QianMi YuJianKun LiuJingYu LiuDingJun LvTengFei Wang
Temperature monitoring of the XPS board insulated subgrade along the newly constructed Gonghe-Yushu Highway in permafrost regions被引量:2
2015年
On the basis of on-site measured data of the newly constructed Gonghe-Yushu Highway in a permafrost region, this paper analyzed thermal conditions of the subgrade with XPS insulated board according to different selected monitoring sections in various locations. We also summarized the geothermal distribution and change rules of subgrade with XPS insulation board under the asphalt pavement in summarized a high temperature frozen soil region. It is suggested that the shoulder of subgrade with XPS insulation board be widen to a reasonable width so as to keep the subgrade stable.
BoWen TaiJianHong FangLei LiuAnHua XuJianKun LiuYa Hu Tian
关键词:PERMAFROSTHIGHWAY
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