凍原土 的英文怎麼說

中文拼音 [dòngyuántǔ]
凍原土 英文
tundra soil
  • 凍 : Ⅰ動詞1 （液體或含水分的東西遇冷凝固） freeze 2 （受冷或感到冷） feel very cold; freeze; be frostb...
  • 原 : Ⅰ形容詞1 （最初的; 原來的） primary; original; former 2 （沒有加工的） unprocessed; raw Ⅱ動詞（原...
  1. The first geologic reason for degeneration of the eco - environment in the headwater area of the yellow river is that the increase of the recent geologic function caused desertification and grasslands resource decreased and underside changed, destroied the balance of water - air - heat in the area ; the second is that the water environment changes by the degradation and atrophy of frozen earth cause multilayer and synthesis cause of formation degeneration of the eco - environment ; the third is that the man and rats function accelerated degeneration of the eco - environment in the headwater area of the yellow river

    摘要黃河源區生態環境惡化的地質原因之一是現代地質作用增強，形成以荒漠化為主的草地資源退化與下墊面改變，地區水氣熱平衡破壞；二是因凍土退化、萎縮，引起水環境變異，導致多層面與綜合成因的生態環境惡化；三是人為及鼠類活動對源區生態環境惡化起著推波助瀾的作用。
  2. In the end of this part, some application examples of fracture mechanics for the frozen soil have been given out. in the second part, continuum damage mechanics has been introduced to study the characteristics of the frozen soil. on base of additional damage concept, a judging model for initial and additional damage for frozen soil was proposed

    第五章進行的是凍土損傷力學的測試研究，首先介紹了凍土損傷的動態測試原理與方法，採用附加損傷的概念推導了凍土初始與附加損傷的動態識別模式，隨后對凍土單軸壓縮過程進行了動態測試，對在這一過程中的內部結構變化特徵進行了研究。
  3. Prevention method and freezing damage of hydraulic structures at season freezing soil irrigation areas

    季節凍土區灌區水工建築物凍害破壞原因及防治措施
  4. Abstract : based on the fundamental principle of hypothesis strain equivalence, itwas investigated a physical concept of high strength concrete at minus temperature ( hscmt ) freezing damage parameter, the elastic modulus of frost concrete with anti freeziug admixture and without antifreezing admixture built and it was analyzed their variate process and the condition adaptated. it is purpose to judge hscmt frost failure process

    文摘:從應變等效性假說的基本原理出發，研究了負溫混凝土凍結損傷參數? ?彈性模量法中受凍后測試的損傷混凝土彈性模量的物理概念，從而分析了摻防凍劑混凝土及不摻防凍劑混凝土受凍后的彈性模量變化過程及其選用該參數的適應性條件，為判斷負溫高強混凝土材料凍結失效過程提供保證。
  5. The aim of this thesis studies frozen - heave forces on culvert brake slab - foundation. first, it introduces the reasons and types of frozen damage of the slab - foundation in seasonal frozen soil conditions. secondly, the experimental studies of frozen soil mechanics were decided in order to revolve frozen - heave forces on the slab - foundation

    本論文以涵閘平板式基礎作為研究對象，首先探討了平板基礎凍脹破壞的原因及破壞類型，並圍繞涵閘工程平板基礎的凍脹力進行了工程凍土力學方面的試驗研究。
  6. In the first part of this dissertation, theory of fracture mechanics of the frozen soil has been presented. a general strength theory based on fracture mechanics was proposed, and the validity of the theory using in frozen soil was discussed. the fracture toughness values for different kinds of cracks extension were determined, such as the plane strain fracture toughness for mode i cracking ( kic ), fracture toughness for mode cracking of frozen soil and the intersection of frozen soil and concrete

    論文第二章為凍土斷裂力學的基本理論，包括斷裂力學在凍土研究中的工程適用性、條件適用性、平面應變斷裂韌度測試的適用條件等，給出了凍土斷裂韌度k _ （ c ） 、 k _ （ c ） 、 -型復合斷裂測試的基本原理及試驗方法，並基於weibull脆性破壞理論推導了凍土三點彎曲試樣k _ （ c ）尺寸效應系數，為後面的工作提供理論基礎。
  7. Smooth blasting technology for a tunnel in frozen soil

    高原凍土隧道施工機械適應性技術
  8. The strength of frozen soil will decrease obviously if it is thawed, especially when ice lens is abundant in it, which is the main cause of the mud pumping in subgrade as well as the instability of foundation in seasonal frozen ground regions

    摘要凍土，特別是含冰透鏡體的凍土解凍時，出現強度大幅度下降的弱化現象，這是季節凍土區內路基春季翻漿冒泥、地基失穩的重要原因。
  9. The phase change of soil moisture and inflation of the frozen moisture c ause the reduction of hydraulic conductivity by reducing the area of flow section and the aperture of soil pore space, increasing the capillary resisting force to soil moisture, and decreasing the water potential gradient because of the increasing of movement distances of soil water

    導水率減小是凍結土壤入滲能力減小的根本原因，而土壤中液態水的相變是導水率減小的根源所在。土壤水分的相變及其膨脹通過減小土壤水分過水斷面面積和孔隙孔徑，增大阻力和由於增長運動距離而減小水勢梯度使凍結土壤的導水率降低。
  10. We built a test road and after one year, we used surface wave exploration to test. the result is that the repaired layer felt old road well and have no empty spot. we used the pendulum friction tested and the results are the wear - resisting property is better than cement concrete pavement and pendulum friction is higher than cement concrete pavement

    此種材料同原有水泥混凝土路面的粘結性能強，強度上升快，韌性大，抗凍性好，防水抗滲；通過試驗路運營一年多的檢測結果表明：通過面波儀測定修補層與原路面粘結良好，沒有脫空點；利用擺式摩擦儀測定其耐摩耗性能優于原水泥混凝土路面。
  11. In cold areas, concrete is always deteriorated by freezing and thawing cycle. the durability and the corrosion of concrete are directly affected by the water - saturated degree of concrete

    寒冷地區凍融循環破壞往往是導致混凝土劣化的主要原因，而混凝土內部的水飽和程度又直接影響了混凝土本身的抗凍性和耐腐蝕性。
  12. Through lab tests on melted and common dark green silty soil of the passway in shanghai fuxing east road tunnel by using the typical triaxial test machine - ckc, their dynamic stress and stress - strain relations with different frequencies were studied

    摘要以上海復興東路越江隧道江底旁通道凍結施工中的原狀和凍融作用后的暗綠色粉質粘土為研究對象，運用ckc循環三軸儀，採用不同的頻率來摸擬行車荷載進行室內動三軸試驗。
  13. The construction techniques for pile foundation in plateau permafrost region

    青藏鐵路高原凍土地區樁基礎施工淺述
  14. Discussion on design and construction of vibra - tion - proof steam turbine foundation

    青藏鐵路二期土建工程第十九標段凍土路基設計原則及施工保障措施
  15. Research on project of in - situ test for seasonal frozen soil subgrade treatment in plateau

    高原季節性凍土路基處治的現場試驗方案研究
  16. In the cold north china, the frost of concrete is one of the main reasons for the destroyed roads and bridges, it develops widely when de - icing salt is used

    在寒冷的北方地區，混凝土凍害是道路和橋梁破壞的主要原因之一，當使用撒鹽除冰時，混凝土的普通凍害將急劇擴大。
  17. Roadbed construction on permafrost will give substantial disturb for the heat and mass transfer balance between the ground surface and atmosphere, usually, roadbed construction increases the amount of absorbed heat via vegetation removal, solar radiation and increased role of water activities in the adjoining area, then cause the local degradation of the permafrost underneath, as a result may lead to damage of the roadbed

    多年凍土區道路的修築，改變了原來天然地表與外界的熱交換關系，通常由於地面植被的破壞、太陽輻射和水的影響，導致進入地層中的熱量增加，引起多年凍土區凍土的融化，從而導致路基面破壞。
  18. Plateau many year frozen earth area roadbed construction technology

    高原多年凍土區路基的施工技術
  19. Many places in our country have long cold season, because of construction period limit, concrete construction in winter is not avoided, knowing concrete construction cold principle in winter is important, so relevant winter concrete construction method must be selected according to local conditions

    摘要因為冬季施工有較長的寒冷季節，由於工期的制約，冬季進行混凝土施工不可避免，故而了解混凝土施工的冬季凍害原理並根據當地的具體條件選擇適當的冬季施工方案就尤為重要。
  20. Application of thermal insulation material in plateau permafrost soil zone subgrade

    高原多年凍土區路基保溫材料的應用
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