中风化凝灰岩嵌岩桩抗拔承载特性研究  

Uplift Bearing Characteristics of Rock-socketed Piles in Middle Weathered Tuff

作　　者：史乙杰 邓会元[2,3] 朱文波[2,3] SHI Yijie;DENG Huiyuan;ZHU Wenbo(Shandong Vocational and Technical University of International Studies,Rizhao,Shandong 276826,China;Key Laboratory of Concrete and Prestressed Concrete Structure of Ministry of Education,Southeast University,Nanjing,Jiangsu 211189,China;School of Civil Engineering,Southeast University,Nanjing,Jiangsu 211189,China)

机构地区：[1]山东外国语职业技术大学,山东日照276826 [2]东南大学混凝土及预应力混凝土结构教育重点实验室,江苏南京211189 [3]东南大学土木工程学院,江苏南京211189

出　　处：《水利与建筑工程学报》2021年第2期131-137,共7页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金项目(51878160);中央高校基本科研业务费专项资金资助和江苏省普通高校研究生科研创新计划项目(KYLX160239,KYCX180115)。

摘　　要：针对某建筑工程地下室抗浮设计问题,为了确定中风化凝灰岩地层嵌岩抗拔桩设计承载力,开展了5根0.7 m和0.8 m两种直径抗拔桩现场试验。试验结果表明各试桩加载至设计值时均为缓变形,最大位移为6.92 mm~10.67 mm,试验中岩层侧摩阻力未充分发挥,安全富裕较大。通过国内外不同规范方法对5根试桩极限抗拔承载力进行计算发现,理论计算得到的嵌岩桩极限抗拔承载力普遍大于设计值,且国外AASHTO方法和加拿大岩土工程手册方法均明显大于建筑桩基规范,且嵌岩段长度越大,计算结果差异越显著。通过试验和理论计算均表明中风化凝灰岩嵌岩段的极限侧阻力发挥潜力较大,可作为抗拔桩的良好持力层。Focusing on the anti-floating design problem of the basement in a project,five uplift piles with 0.7 m and 0.8 m in diameter were adopted to conduct field tests to investigate the uplift bearing capacity of rock-socketed piles in the weathered tuff layer.The test results show that all the test piles are slowly deformed when loaded to the design value,and the maximum displacement is 6.92 mm~10.67 mm.In the test,the shaft resistance of the rock layer is not fully utilized,and the safety factor is relatively large.The ultimate uplift bearing capacity of 5 test piles is calculated by different domestic and foreign standard methods.It is found that the ultimate uplift bearing capacity of rock-socketed piles obtained by theoretical calculation is generally greater than the design value,and the foreign AASHTO method and the Canadian Geotechnical Engineering Manual are both larger than the building pile foundation code,and the greater the length of the rock-socketed section,the more significant the difference in calculation results.Both experiments and theoretical calculations show that the ultimate shaft resistance of the middle-weathered tuff rock-socketed section has great potential and can be used as a good bearing layer for uplift piles.

关 键 词：嵌岩桩 中风化凝灰岩 抗拔承载力 侧摩阻力 建筑规范方法 

分 类 号：TU473[建筑科学—结构工程]