新型劲性水泥土组合桩内界面抗剪强度试验研究  

Experiment on shear strength of inner interface of a new type stiffened deep mixed pile

作　　者：吴学震 夏亚歆 李大勇 游先辉 单宁康 肖贞科 陈祥 WU Xue-zhen;XIA Ya-xin;LI Da-yong;YOU Xian-hui;SHAN Ning-kang;XIAO Zhen-ke;CHEN Xiang(College of Civil Engineering,Fuzhou University,Fuzhou,Fujian 350108,China;College of Pipeline and Civil Engineering,China University of Petroleum(East China),Qingdao,Shandong 266580,China;Fujian Deya New Energy Technology Co.,Ltd.,Fuzhou,Fujian 350005,China;Fujian Guozhu Construction Engineering Co.,Ltd.,Fuzhou,Fujian 350804,China;Zhongxing Huajun Construction Co.,Ltd.,Quanzhou,Fujian 362000,China)

机构地区：[1]福州大学土木工程学院,福建福州350108 [2]中国石油大学(华东)储运与建筑工程学院,山东青岛266580 [3]福建德亚新能源科技有限公司,福建福州350005 [4]福建省国筑建设工程有限公司,福建福州350804 [5]中兴华骏建设有限公司,福建泉州362000

出　　处：《岩土力学》2025年第2期467-478,共12页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.52179098,No.41907251);国家重点研发计划青年科学家项目(No.2024YFC2911000)。

摘　　要：传统劲性水泥土复合桩的内芯多采用预应力混凝土管桩,其仅依靠内外芯的摩擦和黏结来传递荷载。现场调研发现,水泥土桩与管桩界面的胶结力较小,依据规范进行设计时,内界面抗剪强度往往取值很低。针对此种情况,将内芯预应力混凝土管桩替换为钢管桩,探寻其与外芯水泥土桩间界面的抗剪强度,同时又提出将外表面具有螺旋叶片的钢管桩作为新型内芯桩。针对内芯为无肋钢管及螺旋叶片钢管的桩段试样进行了内界面剪切试验,分析了内界面极限剪切力的影响因素并进行了定量数据表征。获得了新型组合桩的内外芯剪切破坏模式及内界面抗剪强度参数的演化规律和计算方法,从而对《劲性复合桩技术规程》(JG/T023-2007)桩体承载力计算公式中的内界面抗剪强度参数取值进行了修正。The inner core of traditional stiffened deep mixed piles is typically a prestressed concrete cylinder,relying solely on friction and bonding between the inner and outer cores to transmit load.Field investigations reveal that the bonding force between the soil-cement pile and the tubular pile interface is minimal.When the design is carried out according to specifications,the shear strength of the inner interface is often significantly low.To address this issue,the inner core prestressed concrete cylinder is replaced with a steel pipe pile,and the shear strength of the interface between the inner core prestressed concrete pipe pile and the outer core cement-soil pile is investigated.Additionally,a steel pipe pile with spiral blades on its outer surface is proposed as a new type of inner core pile.Shear tests on the internal interface were conducted on pile section samples with inner cores of non-ribbed steel pipes and spiral blade steel pipes.The factors influencing the ultimate shear force of the internal interface were analyzed,and the quantitative data were characterized.The shear failure mode of the inner and outer cores of the new composite pile,along with the evolution law and calculation method of the shear strength parameters of the inner interface,were determined.The shear strength parameters of the inner interface in the bearing capacity calculation formula of the pile,as specified in the Technical specification for strength composite piles(JG/T 023-2007),were modified.

关 键 词：劲性水泥土复合桩 钢管桩 螺旋叶片 内界面抗剪强度 模型试验 规范参数修正 

分 类 号：TU473[建筑科学—结构工程]