检索结果-南通市图书馆

Effects of moisture content and dry bulk density on the thermal conductivity of compacted backfill soil

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2022年第8期23卷 610-620页

作者： Yu-hao WU Yan-hao FENG Li-wu FAN Qing WANG Xin SONG Zi-tao YU Institute of Thermal Science and Power Systems Zhejiang UniversityHangzhou 310027China State Key Laboratory of Clean Energy Utilization Zhejiang UniversityHangzhou 310027China Institute of soil Science Chinese Academy of SciencesNanjing 210008China

soil backfilling and compaction are often involved in urban construction projects like the burying of power cables.The thermal conductance of backfill soil is therefore of great interest.To investigate the thermal conductivity variation of compacted backfill soil,10 typical soils sampled in Zhejiang Province of China with moisture contents of 0%–25%were fully compacted according to the Proctor compaction test method and then subjected to thermal conductivity measurement using the thermal probe method at 20℃.The particle size distribution and the chemical composition of the soil samples were characterized to analyze their effects on thermal conductivity.The results showed that the maximum thermal conductivity of fully compacted soils generally exceeds 1.9 W/(m·K)and is 20%–50%higher than that of uncompacted soils.With increasing moisture content,soil thermal conductivity and dry bulk density first increase and then remain unchanged or decrease slowly;the critical moisture content is greater than 20%in most cases.Overall,the critical moisture content of soils with large particle size is lower than that of those with small particle size.Quartz has the highest thermal conductivity in the soil solid phase,and the mass percentage of quartz for most soils in this study is more than 50%,while that for yellow soil is less than 30%,which leads to the thermal conductivity of the former being nearly twice as great as that of the latter in most circumstances.Based on regression analysis,with moisture content and dry bulk density as the independent parameters,the prediction formulae for the thermal conductivity of two categories of compacted backfill soils are proposed for practical applications.

关键词： backfill soil Compaction Thermal conductivity Moisture content Dry bulk density

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

Effect of earth reinforcement,soil properties and wall properties on bridge MSE walls

引用

Frontiers of Structural and Civil Engineering 2021年第5期15卷 1209-1221页

作者： Zaid MOMANI Eyosias BENEBERU Nur YAZDANI Department of Civil Engineering Al-Ahliyya Amman UniversityAmman 19328Jordan Bridgefarmer&Associates DallasTX 75234USA Department of Civil Engineering University of Texas at ArlingtonArlingtonTX 76019USA

Mechanically stabilized earth(MSE)retaining walls are popular for highway bridge structures.They have precast concrete panels attached to earth reinforcement.The panels are designed to have some lateral movement.However,in some cases,excessive movement and even complete dislocation of the panels have been observed.In this study,3-D numerical modeling involving an existing MSE wall was undertaken to investigate various wall parameters.The effects of pore pressure,soil cohesion,earth reinforcement type and length,breakage/slippage of reinforcement and concrete strength,were examined.Results showed that the wall movement is affected by soil pore pressure and reinforcement integrity and length,and unaffected by concrete strength.soil cohesion has a minor effect,while the movement increased by 13–20 mm for flexible geogrid reinforced walls compared with the steel grid walls.The steel grid stresses were below yielding,while the geogrid experienced significant stresses without rupture.Geogrid reinforcement may be used taking account of slippage resistance and wall movement.If steel grid is used,non-cohesive soil is recommended to minimize corrosion.Proper soil drainage is important for control of pore pressure.

关键词： mechanically stabilized earth walls precast concrete panels backfill soil finite element modeling earth reinforcement

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

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

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

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：