摘要
为改善基坑工程中支护桩的受力特性,将传统的直立悬臂桩背向基坑倾斜一定角度,形成基坑支护倾斜悬臂桩,可以更好地承担水平荷载,减小水平位移和变形。通过模型试验的方法对基坑开挖过程中倾斜悬臂桩的桩顶水平位移、桩后土体沉降和桩身弯矩进行研究。试验共进行3种不同工况下的模拟,分析倾斜悬臂桩在不同倾角不同布桩方式下的受力特性。分析结果显示,同等条件下,倾斜悬臂桩较传统直立桩相比,可以有效减小桩底水平位移和桩后土体沉降;桩身弯矩会因基坑开挖深度的增大而增加,桩身的正弯矩峰值接近负弯矩峰值,斜桩的最大弯矩值显著小于直桩支护形式下的弯矩峰值。
To improve the bearing behavior of the retaining pile in foundation pit,the inclined cantilever pile,which is changed from the traditional cantilever pile to a certain angle to the foundation pit,can better bear the horizontal load and reduce the horizontal displacement and deformation.The horizontal displacement of the top of the cantilever pile,the settlement of the soil behind the pile and the bending moment of the pile body are studied through model tests.The tests were carried out under 3 different working conditions,and the stress characteristics of inclined cantilever piles under different dip angles and different pile arrangement modes were analyzed.The results show that under the same conditions,the inclined cantilever pile can more effectively reduce the horizontal displacement of the pile bottom and the soil settlement behind the pile than the vertical pile can.As the depth of the excavation increases,the bending moment of the pile body increases,furthermore the peak value of the positive and negative moments of the pile are similar,and the maximum bending moment of the inclined pile is significantly lower than that of the vertical pile.
作者
孔德森
张杰
王士权
刘一
Kong Desen;Zhang Jie;Wang Shiquan;Liu Yi(College of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao,Shandong 266590,P.R.China;Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation,Shandong University of Science and Technology,Qingdao,Shandong 266590,P.R.China;College of Civil Engineering and Architecture,Shandong Normal University,Jinan 250000,P.R.China;Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430000,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2020年第1期160-168,共9页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金(41372288)
山东科技大学研究生科技创新项目(SDKDYC180212).
关键词
基坑支护
倾斜悬臂桩
受力特性
变形特性
foundation pit support
inclined cantilever pile
stress characteristics
form characteristic
作者简介
孔德森(1977—),男,山东滕州人,工学博士,教授,主要从事基坑工程、桩基工程等领域的教学与科研工作。E-mail:dskong828@163.com
