- 摘 要
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（西安建筑科技大學土木工程學院， 西安 710055）
［摘要］通過模型試驗研究了豎向上拔荷載作用下長徑比為30時斜樁的承載變形和荷載傳遞性狀，并與同條件直樁的性狀進行了比較。結(jié)果表明，在相等樁頂豎向上拔荷載作用下，斜樁豎向上拔量大于直樁豎向上拔量；斜樁樁頂豎向上拔量隨樁身傾角的增大而增加。在樁頂豎向上拔荷載作用下，抗拔直樁與抗拔斜樁樁身軸力上拔量分布具有一定的相似性。斜樁樁身彎矩主要分布在1/2樁長范圍內(nèi)，且隨著樁身傾角的增大而增大；而最大彎矩所處的深度與樁身傾角無關(guān)?？拱沃睒杜c抗拔斜樁的平均側(cè)摩阻力都是從上部開始發(fā)揮并往下傳遞；隨著上拔荷載的增加，樁身上部平均側(cè)摩阻力的數(shù)值變化很小，而樁身中下部平均側(cè)摩阻力迅速增長。抗拔直樁與抗拔斜樁端部平均側(cè)摩阻力都表現(xiàn)出弱化現(xiàn)象。
［關(guān)鍵詞］斜樁； 模型試驗； 抗拔承載力； 軸力； 彎矩； 側(cè)摩阻力
中圖分類號：TU473文獻標識碼：A文章編號：1002-848X(2017)15-0093-04
Experimental study of model test of uplift inclined piles in sand
Feng Zhiyan, Ren Zixiong, Li Sheng
(College of Civil Engineering， Xi′an University of Architecture and Technology， Xi′an 710055， China)
Abstract:Based on the model tests, the bearing capacity and load transfer behavior of inclined piles with length-diameter ratio of 30 under the vertical uplift load were studied, and the results were compared with straight pile under the same conditions. The results show that under the same vertical uplift load on pile top, the vertical displacement of the inclined pile is greater than the vertical displacement of the straight pile, and top vertical uplift displacement of inclined pile increases with the increase of pile inclination. Under the vertical uplift load on pile top, distributions of pile axial force of straight uplift pile and inclined uplift pile have a certain similarity. Bending moment of the inclined pile is mainly distributed in the range of 1/2 pile length, and increases with the increase of pile inclination. The depth where the maximum bending moment locates has no relation with pile body inclination. The average lateral frictional resistance of straight uplift pile and inclined uplift pile emerges from the upper part to pass down to lower parts. Along with the increase of uplift load, the average lateral frictional resistance of upper part of pile has very small change in numerical value, and the average lateral frictional resistance of middle and lower parts of pile has a rapid growth. The lateral frictional resistance of the top of straight uplift pile and inclined uplift pile are both weakened.
Keywords:inclined pile; model test; pullout capacity; axial force; bending moment; lateral frictional resistance
作者簡介：馮志焱，博士，副教授，Email:zyfeng5769@xauat.edu.cn。
