本文選題：島狀多年凍土 + 樁基礎(chǔ)��； 參考：《巖土力學(xué)》2015年S2期

【摘要】：凍土與普通的土體相比具有獨(dú)特的工程性質(zhì)。在凍土地區(qū)進(jìn)行樁基礎(chǔ)施工后,樁和周圍土體在凍土地溫及大氣溫度的作用下逐漸回凍,回凍過程中在冰的膠結(jié)作用下樁與周圍土體聯(lián)結(jié)成整體共同承受外荷載作用。為了研究回凍前后樁基的承載力變化及變形性質(zhì),在大興安嶺地區(qū)澆筑了2根15 m試驗(yàn)樁,試驗(yàn)樁中布設(shè)了溫度監(jiān)測系統(tǒng),采集了樁基回凍過程中的溫度數(shù)據(jù)。根據(jù)溫度監(jiān)測結(jié)果在樁基回凍前后進(jìn)行了自平衡靜載試驗(yàn),研究了回凍前后樁基承載力、各土(巖)層的側(cè)摩阻力及樁端阻力。研究結(jié)果表明,樁基回凍后凍土地溫保持在-1.9℃樁基的承載力是回凍前承載力的1.42倍;端阻力是回凍前的1.49倍為964 k N,占樁基承載力的12.98%;各土(巖)層的側(cè)摩阻力均有所增長,平均增長率為40.3%。研究結(jié)果可為類似凍土條件下的樁基設(shè)計(jì)及施工提供理論依據(jù)。
[Abstract]:Frozen soil has unique engineering properties compared with ordinary soil. After pile foundation construction is carried out in frozen soil area, the pile and surrounding soil are frozen gradually under the action of frozen soil temperature and atmospheric temperature. During the freezing process, the pile is connected with the surrounding soil to bear the external load under the action of ice cementation. In order to study the change of bearing capacity and deformation property of pile foundation before and after refreezing, two 15m test piles were built in Daxing'anling area. The temperature monitoring system was set up in the test pile, and the temperature data of the pile foundation during the freezing process were collected. Based on the temperature monitoring results, the self-equilibrium static load tests were carried out before and after the pile foundation was frozen. The bearing capacity of the pile foundation, the lateral friction of each soil (rock) layer and the pile tip resistance were studied before and after the refreezing. The results show that the bearing capacity of the pile foundation maintained at -1.9 鈩，

本文編號：1966557