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(qū)土壤凍結(jié)對(duì)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(jié)的地埋管周圍土壤傳熱模型,并利用顯熱容法對(duì)凍結(jié)相變問題進(jìn)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(duì)土壤凍結(jié)過程的數(shù)值分析,基于顯熱容法用有限差分法構(gòu)造出熱傳導(dǎo)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(jì)算結(jié)果表明，該方法不僅能模擬凍結(jié)過程中土壤水分、溫度的變化，且在計(jì)算中土壤含水量較低時(shí)不需要在凍結(jié)區(qū)引入冰的阻抗系數(shù)的概念，較好地改進(jìn)了已有的數(shù)值模擬，為模擬各種不同條件下的土壤凍結(jié)過程創(chuàng)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(duì)象,根據(jù)室內(nèi)單軸和三軸壓縮試驗(yàn)的試驗(yàn)結(jié)果,分析了高圍壓下凍結(jié)粘土的應(yīng)力-應(yīng)變行為與單軸壓縮條件下應(yīng)力-應(yīng)變行為的異同,并討論了圍壓和溫度對(duì)凍結(jié)粘土強(qiáng)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(jié)粘土為試樣,利用擺錘式?jīng)_擊試驗(yàn)儀進(jìn)行不同溫度、不同沖擊能量的帶缺口的沖擊實(shí)驗(yàn),利用鑿測器進(jìn)行了凍土鑿碎比能試驗(yàn)。
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(shí)測了在－１℃，－３℃，－５℃，－７℃，－１０℃，－１２℃，－１５℃，－１７℃及－１８℃等９個(gè)不同溫度下凍結(jié)粘土的縱、橫波速，對(duì)試驗(yàn)數(shù)據(jù)進(jìn)行了分析，結(jié)果表明，凍結(jié)粘上的縱、橫波速度隨溫度的降低而增大，當(dāng)溫度從０℃降至－４℃時(shí)，波速與溫度呈線性關(guān)系，隨著溫度的繼續(xù)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(yīng)變率條件下分別垂直和平行冰層對(duì)層狀構(gòu)造凍結(jié)粉土進(jìn)行了單軸抗壓強(qiáng)度試驗(yàn),分析了2種不同加載方向?qū)訝顦?gòu)造凍結(jié)粉土力學(xué)性質(zhì)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(yīng)變率條件下,分別對(duì)圓柱體和正方體凍結(jié)粉土進(jìn)行了單軸抗壓強(qiáng)度試驗(yàn),分析比較了二者的應(yīng)力-應(yīng)變關(guān)系、抗壓強(qiáng)度及破壞應(yīng)變。
Creep tests were conducted on frozen silt (loess) under dynamic loading with the frequency of 5Hz at -5℃.
對(duì)凍結(jié)粉土在不同圍壓下進(jìn)行了振動(dòng)蠕變?cè)囼?yàn),振動(dòng)頻率為5Hz,試樣溫度為-5℃試驗(yàn)發(fā)現(xiàn)蠕變破壞時(shí)間及最小蠕變率隨圍壓的變化具有極值,并據(jù)此提出了最大強(qiáng)度臨界圍壓的概念,而破壞應(yīng)變則與圍壓基本無關(guān),其蠕變破壞準(zhǔn)則與靜載下的破壞準(zhǔn)則具有相同形式。
RESEARCH OF GROUND FROZEN DEPTH IN SEASONALLY FROZEN AREAS
季節(jié)性凍土地區(qū)土壤凍結(jié)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(jié)溫度場的模擬研究
Analysis on Soil Frozen and Thawed Regulation under Different Soil Surfaces
不同地表?xiàng)l件下土壤凍結(jié)、融化規(guī)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(jié)取熱過程的模擬研究
soil consistence
土壤結(jié)持度, 土壤稠性
Thermal analysis of artificially frozen wall in seasonal frozen area
季節(jié)凍土地區(qū)人工凍土墻的凍結(jié)特性研究
Soil Temperature Variation in Plough Layer and Soil Freeze-Thaw Characteristics during Seasonal Freezing and Thawing Period
季節(jié)性凍融期耕作層土壤溫度及土壤凍融特性的試驗(yàn)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(yàn)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(yàn)研究
FEOZEN-HEAVING OF GROUND-SOURCE HEAT PUMP SYSTEM IN COLD REGION
寒區(qū)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(jìn)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(huán)境分析
Research on the Forming and Thawing of Frozen Soil Walls by Artificial Ground Freezing Method;
人工地層凍結(jié)凍土帷幕形成與解凍規(guī)律研究
Research on the Influence of Frost Heave of Frozen Soil to Derrick Footing in Freezing Sinking Shaft;
凍結(jié)法鑿井凍土凍脹對(duì)井架基礎(chǔ)影響的研究
Clay gives the soil body.
粘土能使土壤板結(jié)。
Field Measurement Analysis of Natural Thawing and Artificial Thawing of Frozen Soil by Artificial Ground Freezing
人工地層凍結(jié)凍土自然解凍與強(qiáng)制解凍實(shí)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(duì)黑土土壤有機(jī)質(zhì)及氮鉀養(yǎng)分的影響
Monitoring Soil Water in Frozen Soil on the Central Tibetan Plateau
青藏高原中部凍土環(huán)境下土壤水分監(jiān)測