In order to search the effect of soil freezing on heat exchange characteristics of ground heat exchangers in cold zone,develops a heat transfer model of soil around ground heat exchangers taking soil freezing into consideration,and solves the freezing phase change problem by apparent heat capacity method.
为了探讨寒冷地区土壤冻结对地源热泵地埋管换热器换热特性的影响,建立了考虑土壤冻结的地埋管周围土壤传热模型,并利用显热容法对冻结相变问题进行了处理。
Based on the numerical calculus of soil freezing and the apparent heat capacity method, completely and partly implicit difference schemes of the heat transfer equation were deduced by the finite difference method with variable space step.
针对土壤冻结过程的数值分析,基于显热容法用有限差分法构造出热传导方程变空间步长的半隐格式和全隐格式。
Based on the basic equations of simultaneous soil water and heat transfer during soil freezing, the coupled equation of moisture and heat is deduced.
计算结果表明，该方法不仅能模拟冻结过程中土壤水分、温度的变化，且在计算中土壤含水量较低时不需要在冻结区引入冰的阻抗系数的概念，较好地改进了已有的数值模拟，为模拟各种不同条件下的土壤冻结过程创造了条件。
At the same time,the effect of negative temperature and confining pressure on the strength of frozen clay was analyzed.
以取自华东某地的深部粘土为研究对象,根据室内单轴和三轴压缩试验的试验结果,分析了高围压下冻结粘土的应力-应变行为与单轴压缩条件下应力-应变行为的异同,并讨论了围压和温度对冻结粘土强度的作用。
The impact toughness and the uneven extent of destroyed sample are the practical indexes of impact properties of frozen clay.
以冻结粘土为试样,利用摆锤式冲击试验仪进行不同温度、不同冲击能量的带缺口的冲击实验,利用凿测器进行了冻土凿碎比能试验。
The longitudinal and transverse wave velocities of frozen clays are measured by UVM-2 ultrasonic instrument and 500 kHz broadband ultrasonic transducer at the temperature of -1℃,-3℃,-5℃,-7℃,-10℃,-12℃,-15℃,-17℃and -18℃.
用ＵＶＭ－２型声波仪和５００ ｋＨｚ宽带超声换能器实测了在－１℃，－３℃，－５℃，－７℃，－１０℃，－１２℃，－１５℃，－１７℃及－１８℃等９个不同温度下冻结粘土的纵、横波速，对试验数据进行了分析，结果表明，冻结粘上的纵、横波速度随温度的降低而增大，当温度从０℃降至－４℃时，波速与温度呈线性关系，随着温度的继续降低，波速增加减慢。
The compressive strength tests were performed on frozen silt with layered structure under loading vertical and parallel to ice layer with various temperatures and strain rates.
在不同温度和应变率条件下分别垂直和平行冰层对层状构造冻结粉土进行了单轴抗压强度试验,分析了2种不同加载方向对层状构造冻结粉土力学性质的影响。
To explore specimen shape effects on the compressive strength of frozen silt,a series of uniaxial compressive strength tests was respectively performed on frozen silt in cylindrical and cubic shapes at the same experimental conditions.
在不同温度和应变率条件下,分别对圆柱体和正方体冻结粉土进行了单轴抗压强度试验,分析比较了二者的应力-应变关系、抗压强度及破坏应变。
Creep tests were conducted on frozen silt (loess) under dynamic loading with the frequency of 5Hz at -5℃.
对冻结粉土在不同围压下进行了振动蠕变试验,振动频率为5Hz,试样温度为-5℃试验发现蠕变破坏时间及最小蠕变率随围压的变化具有极值,并据此提出了最大强度临界围压的概念,而破坏应变则与围压基本无关,其蠕变破坏准则与静载下的破坏准则具有相同形式。
RESEARCH OF GROUND FROZEN DEPTH IN SEASONALLY FROZEN AREAS
季节性冻土地区土壤冻结深度的研究
Simulation Research on Soil Freezing Temperature Field Surrounding Ground Heat Exchanger
地埋管换热器周围土壤冻结温度场的模拟研究
Analysis on Soil Frozen and Thawed Regulation under Different Soil Surfaces
不同地表条件下土壤冻结、融化规律分析
Simulation Study on Freezing Heat Extraction of U Buried Pipe Heat Exchanger of Ground-source Heat Pump
土壤源热泵U型埋管换热器冻结取热过程的模拟研究
soil consistence
土壤结持度, 土壤稠性
Thermal analysis of artificially frozen wall in seasonal frozen area
季节冻土地区人工冻土墙的冻结特性研究
Soil Temperature Variation in Plough Layer and Soil Freeze-Thaw Characteristics during Seasonal Freezing and Thawing Period
季节性冻融期耕作层土壤温度及土壤冻融特性的试验研究
Study on Northern Yinshan Shallow Soil Freezing-thawing Feature Experiment;
阴山北部浅层土壤冻融特性试验研究
Experimental Study on Freeze-thaw Process of Soil after Autumn Irrigation
冬灌条件下土壤冻融过程的试验研究
FEOZEN-HEAVING OF GROUND-SOURCE HEAT PUMP SYSTEM IN COLD REGION
寒区土壤源热泵埋管冻胀安全性分析
Progress on N_2O emission from soil in the freeze-thaw process
冻融条件下土壤N_2O排放研究进展
Freezing-Thawing Condition of Main Dryland Farming Soil Areas in Northeast China
东北主要旱地耕作土壤冻融环境分析
Research on the Forming and Thawing of Frozen Soil Walls by Artificial Ground Freezing Method;
人工地层冻结冻土帷幕形成与解冻规律研究
Research on the Influence of Frost Heave of Frozen Soil to Derrick Footing in Freezing Sinking Shaft;
冻结法凿井冻土冻胀对井架基础影响的研究
Clay gives the soil body.
粘土能使土壤板结。
Field Measurement Analysis of Natural Thawing and Artificial Thawing of Frozen Soil by Artificial Ground Freezing
人工地层冻结冻土自然解冻与强制解冻实测分析
The Effect of Alternative Freezing and Thawing on Soil Organic Matter and Nitrogen Potassium Nutrition of Black Soil;
冻融交替对黑土土壤有机质及氮钾养分的影响
Monitoring Soil Water in Frozen Soil on the Central Tibetan Plateau
青藏高原中部冻土环境下土壤水分监测
