'frozen' land

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.

為了探討寒冷地區土壤凍結對地源熱泵地埋管換熱器換熱特性的影響,建立了考慮土壤凍結的地埋管周圍土壤傳熱模型,并利用顯熱容法對凍結相變問題進行了處理。

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.

針對土壤凍結過程的數值分析,基于顯熱容法用有限差分法構造出熱傳導方程變空間步長的半隱格式和全隱格式。

Based on the basic equations of simultaneous soil water and heat transfer during soil freezing, the coupled equation of moisture and heat is deduced.

計算結果表明，該方法不僅能模擬凍結過程中土壤水分、溫度的變化，且在計算中土壤含水量較低時不需要在凍結區引入冰的阻抗系數的概念，較好地改進了已有的數值模擬，為模擬各種不同條件下的土壤凍結過程創造了條件。

At the same time,the effect of negative temperature and confining pressure on the strength of frozen clay was analyzed.

以取自華東某地的深部粘土為研究對象,根據室內單軸和三軸壓縮試驗的試驗結果,分析了高圍壓下凍結粘土的應力-應變行為與單軸壓縮條件下應力-應變行為的異同,并討論了圍壓和溫度對凍結粘土強度的作用。

The impact toughness and the uneven extent of destroyed sample are the practical indexes of impact properties of frozen clay.

以凍結粘土為試樣,利用擺錘式沖擊試驗儀進行不同溫度、不同沖擊能量的帶缺口的沖擊實驗,利用鑿測器進行了凍土鑿碎比能試驗。

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型聲波儀和５００ ｋＨｚ寬帶超聲換能器實測了在－１℃，－３℃，－５℃，－７℃，－１０℃，－１２℃，－１５℃，－１７℃及－１８℃等９個不同溫度下凍結粘土的縱、橫波速，對試驗數據進行了分析，結果表明，凍結粘上的縱、橫波速度隨溫度的降低而增大，當溫度從０℃降至－４℃時，波速與溫度呈線性關系，隨著溫度的繼續降低，波速增加減慢。

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.

在不同溫度和應變率條件下分別垂直和平行冰層對層狀構造凍結粉土進行了單軸抗壓強度試驗,分析了2種不同加載方向對層狀構造凍結粉土力學性質的影響。

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.

在不同溫度和應變率條件下,分別對圓柱體和正方體凍結粉土進行了單軸抗壓強度試驗,分析比較了二者的應力-應變關系、抗壓強度及破壞應變。

Creep tests were conducted on frozen silt (loess) under dynamic loading with the frequency of 5Hz at -5℃.

對凍結粉土在不同圍壓下進行了振動蠕變試驗,振動頻率為5Hz,試樣溫度為-5℃試驗發現蠕變破壞時間及最小蠕變率隨圍壓的變化具有極值,并據此提出了最大強度臨界圍壓的概念,而破壞應變則與圍壓基本無關,其蠕變破壞準則與靜載下的破壞準則具有相同形式。

RESEARCH OF GROUND FROZEN DEPTH IN SEASONALLY FROZEN AREAS

季節性凍土地區土壤凍結深度的研究

Simulation Research on Soil Freezing Temperature Field Surrounding Ground Heat Exchanger

地埋管換熱器周圍土壤凍結溫度場的模擬研究

Analysis on Soil Frozen and Thawed Regulation under Different Soil Surfaces

不同地表條件下土壤凍結、融化規律分析

Simulation Study on Freezing Heat Extraction of U Buried Pipe Heat Exchanger of Ground-source Heat Pump

土壤源熱泵U型埋管換熱器凍結取熱過程的模擬研究

soil consistence

土壤結持度, 土壤稠性

Thermal analysis of artificially frozen wall in seasonal frozen area

季節凍土地區人工凍土墻的凍結特性研究

Soil Temperature Variation in Plough Layer and Soil Freeze-Thaw Characteristics during Seasonal Freezing and Thawing Period

季節性凍融期耕作層土壤溫度及土壤凍融特性的試驗研究

Study on Northern Yinshan Shallow Soil Freezing-thawing Feature Experiment;

陰山北部淺層土壤凍融特性試驗研究

Experimental Study on Freeze-thaw Process of Soil after Autumn Irrigation

冬灌條件下土壤凍融過程的試驗研究

FEOZEN-HEAVING OF GROUND-SOURCE HEAT PUMP SYSTEM IN COLD REGION

寒區土壤源熱泵埋管凍脹安全性分析

Progress on N_2O emission from soil in the freeze-thaw process

凍融條件下土壤N_2O排放研究進展

Freezing-Thawing Condition of Main Dryland Farming Soil Areas in Northeast China

東北主要旱地耕作土壤凍融環境分析

Research on the Forming and Thawing of Frozen Soil Walls by Artificial Ground Freezing Method;

人工地層凍結凍土帷幕形成與解凍規律研究

Research on the Influence of Frost Heave of Frozen Soil to Derrick Footing in Freezing Sinking Shaft;

凍結法鑿井凍土凍脹對井架基礎影響的研究

Clay gives the soil body.

粘土能使土壤板結。

Field Measurement Analysis of Natural Thawing and Artificial Thawing of Frozen Soil by Artificial Ground Freezing

人工地層凍結凍土自然解凍與強制解凍實測分析

The Effect of Alternative Freezing and Thawing on Soil Organic Matter and Nitrogen Potassium Nutrition of Black Soil;

凍融交替對黑土土壤有機質及氮鉀養分的影響

Monitoring Soil Water in Frozen Soil on the Central Tibetan Plateau

青藏高原中部凍土環境下土壤水分監測