【摘要】：選取青藏高原國道214沿線低溫基本穩(wěn)定區(qū)查拉坪旱橋樁基和高溫不穩(wěn)定區(qū)花石峽試驗場樁基,對其運行期內(nèi)地溫進行連續(xù)監(jiān)測�；诂F(xiàn)場地溫實測數(shù)據(jù),從凍土上限、凍結(jié)及融化過程3個方面,分析樁基對凍土地溫的影響,顯示因樁基良好的導(dǎo)熱性能加劇了樁周凍土與大氣的熱交換,樁周地溫年較差明顯增大。結(jié)合勘察設(shè)計資料建立數(shù)學(xué)模型,應(yīng)用有限元數(shù)值模擬方法就樁基對地溫場的長期影響進行預(yù)測,結(jié)果表明,未來50 a氣溫上升2℃的情況下,樁側(cè)凍土上限與天然上限差異有所增大,樁側(cè)多年凍土溫度升高,該現(xiàn)象在高溫不穩(wěn)定凍土區(qū)表現(xiàn)得更為明顯。所得結(jié)論可為多年凍土區(qū)樁基設(shè)計、降溫保護措施采取及運行管理措施實施提供參考。
[Abstract]:The pile foundation of Zhalaping dry bridge in the low temperature basic stable area along the national highway 214 of Qinghai-Tibet Plateau and the pile foundation of Huashixia test site in high temperature unstable area were selected to continuously monitor the inland temperature during its operation period. Based on the measured data of ground temperature in situ, the influence of pile foundation on ground temperature of frozen soil is analyzed from three aspects: upper limit of frozen soil, freezing and melting process. It is shown that the heat exchange between frozen soil and atmosphere around pile is aggravated by the good thermal conductivity of pile foundation. The annual difference of ground temperature around the pile increases obviously. Based on the survey and design data, the mathematical model is established, and the long-term influence of pile foundation on the ground temperature field is predicted by finite element numerical simulation method. The results show that when the temperature increases by 2 鈩，

本文編號：2483695