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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 *** thermal conductance of backfill soil is therefore of great *** 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 *** 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 *** 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 ***,the critical moisture content of soils with large particle size is lower than that of those with small particle *** 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 *** 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

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Study of Soil-Water Characteristic Curve Using Microscopic Spherical Particle Model

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Pedosphere 2012年第1期22卷 103-111页

作者： YANG Song LU Ting-Hao Key Laboratory for Geomechanics and Embankment Engineering of Ministry of Education Hohai UniversityNanjing210098(China) Geotechnical Research Institute Hohai UniversityNanjing 210098(China)

When variations occur in the water content or dry bulk density of soil,the contact angle hysteresis will affect the soil-water characteristic curve(SWCC).The occurrence of the contact angle hysteresis can be divided into slipping and *** is difficult to determine the effect of pinning existence on SWCC by *** this study,the effect of contact angle hysteresis on SWCC was analyzed either in the case of no variations in soil dry bulk density with changes in soil water content or no variations in soil water content with changes in soil dry bulk *** both cases,soil particles were simplified to the spherical particle *** on the geometrically mechanic relationship between the particles and connecting liquid bridges,a physical model for predicting the SWCC was derived from the spherical particle *** parameters made the model applicable to various soils,that is,the cohesive soil was considered as micron-sized spherical *** the simulations on SWCC test data of sand,silt,clay,and swelling soil,it was confirmed that the physical model possessed good reliability and ***,the analysis of rationality of contact angle was performed based on the basic assumptions of the model.

关键词： connecting liquid bridge contact angle hysteresis dry bulk density physical model

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