检索结果-南通市图书馆

Effect of the lenticles on moisture migration in capillary zone of tailings dam

International Journal of Minerals,Metallurgy and Materials 2020年第8期27卷 1036-1045页

作者： Di Liu Min-jie Lian Cai-wu Lu Wen Zhang College of Materials Science and Engineering Xi’an University of Architecture and TechnologyXi’an 710055China Institute of Mining System Engineering Xi’an University of Architecture and TechnologyXi’an 710055China Sinosteel Mining Co. Ltd.Beijing 100080China School of Resource Engineering Xi’an University of Architecture and TechnologyXi’an 710055China

Small-particle interlayers(lenticles)show some characteristic hydraulic properties and can affect the movement of unsaturated *** this study,we developed a novel online capillary-water-absorption monitoring device and conducted three groups of comparison tests to simulate lenticle positions and thicknesses with respect to the capillary *** results show that the characteristic wetting front exhibits a fast rise in the early stage,a slow rise in the middle stage,and stability in the later *** motion of the capillary water in the lenticle is mainly transversal,with the upward curve being"flat,"and the longer is"flat,"the longer is the time needed for the water to *** interlayer can form a capillary stagnation zone with moisture content close to *** high interlayer may form a discontinuous corrugated capillary ***,when the wetting front reaches the"coarse-grain(lower)-fine-grain(upper)"interface,the"anti-capillary barrier effect"results in more moisture in the upper ***,when the wetting front of the capillary water reaches the"fine-grain(upper)-coarse-grain(lower)"interface,the"capillary barrier effect"causes the moisture content of the upper tailings to decreases sharply because of the horizontal movement of the water in the fine *** is clear that the presence of lenticles can retard the rise of capillary water by storing water.

关键词： tailings lenticle moisture migration capillary retarding effect microcosmic mechanism

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Understanding the microscopic moisture migration in pore space using DEM simulation

引用

Journal of Rock Mechanics and Geotechnical Engineering 2015年第2期7卷 171-177页

作者： Yuan Guo Xiong(Bill) Yu Department of Civil Engineering Case Western Reserve University

The deformation of soil skeleton and migration of pore fluid are the major factors relevant to the triggeringof and damages by liquefaction. The influence of pore fluid migration during earthquake has beendemonstrated from recent model experiments and field case studies. Most of the current liquefactionassessment models are based on testing of isotropic liquefiable materials. However the recent NewZealand earthquake shows much severer damages than those predicted by existing models. A fundamentalcause has been contributed to the embedded layers of low permeability silts. The existence ofthese silt layers inhibits water migration under seismic loads, which accelerated liquefaction and causeda much larger settlement than that predicted by existing theories. This study intends to understand theprocess of moisture migration in the pore space of sand using discrete element method （DEM） *** were conducted on consolidated undrained triaxial testing of sand where a cylindersample of sand was built and subjected to a constant confining pressure and axial loading. The porositydistribution was monitored during the axial loading process. The spatial distribution of porosity changewas determined, which had a direct relationship with the distribution of excess pore water pressure. Thenon-uniform distribution of excess pore water pressure causes moisture migration. From this, themigration of pore water during the loading process can be estimated. The results of DEM simulationshow a few important observations：（1） External forces are mainly carried and transmitted by the particlechains of the soil sample; （2） Porosity distribution during loading is not uniform due to nonhomogeneoussoil fabric （i.e. the initial particle arrangement and existence of particle chains）; （3）Excess pore water pressure develops differently at different loading stages. At the early stage of loading,zones with a high initial porosity feature higher porosity changes under the influence of e

关键词： moisture migration Consolidated undrained triaxial test Particle chains Porosity distribution Pore water pressure

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effects of sucrose crystallization and moisture migration on the structural changes of a coated intermediate moisture food

引用

Frontiers of Chemical Science and Engineering 2009年第4期3卷 346-350页

作者： Tiancheng LI Peng ZHOU Theodore P.LABUZA State Key Laboratory of Food Science and Technology Jiangnan UniversityWuxi 214122China School of Food Science and Technology Jiangnan UniversityWuxi 214122China Department of Food Science and Nutrition University of MinnesotaSaint PaulMN 55108USA

The purpose of this study was to investigate whether moisture migration and sugar crystallization play an important role in the changes of IMF matrix *** migration of water was monitored with changes of water activity in different physical domains of samples during storage,while the crystallization of sucrose was determined with X-ray powder diffraction(XRD).The formation of both a hard inner-layer and agglomerated particles in the inner matrix was observed during *** results suggested that both moisture loss and sucrose crystallization were mainly responsible for the formation of the crusty intermediate inner layer,and the agglomerated matrix particles were the result of sucrose crystallization.

关键词： sugar crystallization moisture migration intermediate moisture foods texture water activity

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Experimental study on moisture migration of remodeled clay under different overburden pressure and temperature gradients

引用

Research in Cold and Arid Regions 2013年第5期5卷 562-571页

作者： Feng Ming DongQing Li Xing Huang JianHong Fang State Key Laboratory of Frozen Soil Engineering Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of Sciences Qinghai Research Institute of Transportation

Unidirectional freezing experiments under overburden pressure were carried out, in order to study the driving force of mois- ture migration of remodeled clay during freezing, through improving the indoor moisture migration test device. Overburden pressure and cooling temperature with the same circumstance were changed to determine the influence on water migration of a single factor. Results show that water content increases above the location of the final ice lenses and decreases below the loca- tion. When the overburden pressure increases, water intake gradually decreases and the time starting to absorb water is delayed. The location of the final ice lens is not sensitive to overburden pressure but influenced by the temperature boundary. The im- pact of overburden pressure and maximum temperature is not obvious. Freezing rate is not sensitive to overburden pressure but influenced by temperature, and it increases when the cold temperature decreases. Frost heave and water intake flow in- creases with increasing time and rises up to a peak value, and then decreases. During the freezing process, water intake flow increases when freezing rate decreases. Water intake flow decreases when the overburden pressure increases when the cold temperature decreases. Finally, we expanded the segregation theory, and proposed a model to describe the relationship between water intake flow and freezing rate.

关键词： frost heave moisture migration overburden pressure temperature gradient open system indoor experiments

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Numerical simulation of electroosmosis in unsaturated compacted clay

引用

Research in Cold and Arid Regions 2021年第5期13卷 394-407页

作者： KangWei Tang Feng Zhang DeCheng Feng GuanFu Wang School of Transportation Science and Engineering Harbin Institute of Technology73 Huanghe RoadHarbinHeilongjiang 150090China

The moisture content of a road subgrade in cold regions will increase after freeze-thaw cycles,resulting in subgrade strength and stiffness *** is widely used in treating saturated soft soils to decrease the moisture *** induced moisture migration during electroosmosis in unsaturated soil is much more complex than that of saturated soil because of a series of nonlinear changes in soil *** study first uses an exponential function to characterize the relationship between electroosmotic permeability and saturation ***,a one-dimensional model is developed to simulate the electroosmosis-induced moisture migration in unsaturated *** results show that electroosmosis reduces the saturation degree of the unsaturated soil,indicating that it can be applied to subgrade *** parameters such as soil pore size distribution coefficient,air entry value,and effective voltage significantly affect moisture *** properties of unsaturated soils are extremely important to the efficiency of electroosmosis.

关键词： electro-osmosis unsaturated clay moisture migration numerical simulation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Study of polluted soil remediation based on freezing and thawing cycles

引用

Research in Cold and Arid Regions 2014年第4期6卷 322-330页

作者： DaHu Rui BaiYang Song Yuzuru Ito Li Wang School of Civil Engineering Henan Polytechnic University Dept. of Civil Engineering Setsunan University Neyagawa

It is generally known that soil pollution poses a terrible hazard to the environment, but the present techniques of contaminated soil remediation cannot control this growing threat. This paper compares the pollutant extraction efficiency of traditional pumping and treating, which is a typical washing technology for the remediation of contaminated soils, with methods that utilize freeze-thaw cycles. In the soil freezing process, water shifts from unfrozen soils to the freezing front, and the permeability of soil will be enhanced under certain temperature gradients and water conditions. Therefore, this paper discusses the purification of contaminated soil through freeze-thaw action. We conducted a cleansing experiment on clay and silica sand infused with NaCl（simulation of heavy metals） and found that the efficiency of purification was enhanced remarkably in the latter by the freeze-thaw action. To assess the effective extraction of DNAPLs in soil, we conducted an experiment on suction by freezing, predicated on the different freezing points of moisture and pollutants. We found that the permeability coefficient was significantly increased by the freezing-thawing action, enabling the DNAPL contaminants to be extracted selectively and effectively.

关键词： soil pollution remediation washing technology freezing process thawing process moisture migration

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Basic properties of saline soil in Da'an, western Jilin, China

引用

Research in Cold and Arid Regions 2015年第5期7卷 568-572页

作者： Xin Zhou Qing Wang XueFei Zhang TianWen Yu XuDong Zhang College of Construction Engineering Jilin University

This paper studied the basic properties of saline soil at different depths of a sampling site in Da＇an, China, through field reconnaissance and laboratory analysis. A series of experiments which comprised the analyses of grain size distribution, mineral composition, soil physical properties, soluble salt concent, pH, organic content and cation exchange capacity were conducted. Through these experiments, the distribution rule of each property and their causes are discussed. These results could provide a fundamental base for the study of moisture migration.

关键词： saline soil basic properties distribution rule moisture migration

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：