桩土界面荷载传递函数的修正  

Modification of load transfer function for pile-soil interface in collapsible loess

作　　者：王进寿 吴昊 杨阳 曹铭 张渭军 段天昊 WANG Jin-shou;WU Hao;YANG Yang;CAO Ming;ZHANG Wei-jun;DUAN Tian-hao(Gansu Third Construction Group Company,Lanzhou 730000,China;School of Civil Engineering,Lanzhou Univ.of Tech.,Lanzhou 730050,China;School of Civil Engineering,Longdong University,Qingyang 745000,China;Qingyang Vocational and Technical College,Qingyang 745000,China;State Grid Xinjiang Electric Power Co.Ltd.,Xinhe County Power Supply Company,Akesu 843000,China)

机构地区：[1]甘肃第三建设集团有限公司,甘肃兰州730050 [2]兰州理工大学土木工程学院,甘肃兰州730050 [3]陇东学院土木工程学院,甘肃庆阳745000 [4]庆阳职业技术学院,甘肃庆阳745000 [5]国网新疆电力有限公司新和县供电公司,新疆阿克苏843000

出　　处：《兰州理工大学学报》2024年第2期124-130,共7页Journal of Lanzhou University of Technology

基　　金：甘肃省自然科学基金(21JR11RM052)。

摘　　要：土体的固结沉降计算对于桩侧负摩擦力具有较大影响.在非饱和土力学的框架下,基于桩土界面作用原理,根据湿陷性黄土的水力等效原理,计算出浸水等效后的荷载,之后考虑非饱和土固结特性,建立等效荷载作用下的孔隙气、液两相的控制方程,进而推导出排气阶段土体的沉降量计算.根据桩周土体沉降量与桩身轴力、负摩阻力之间的关系求得桩侧负摩阻力,并利用相关算例对该计算方法的合理性进行了验证.结果表明:该计算方法具有一定的可行性,丰富了桩基负摩阻力的计算模型,为桩基础负摩阻力的研究提供了新思路.The consolidation settlement of soil has a great influence on negative friction acting on the sides of piles.Under the framework of unsaturated soil mechanics,based on the interaction principle of the soil-pile interface,a computation methodology for consolidation settlement of soil is proposed in this study.Firstly,according to the hydraulic equivalent principle of collapsible loess,the equivalent load after immersion is calculated.Subsequently,considering the consolidation characteristics of unsaturated soil,the governing equation of pore air and liquid under the equivalent load is established,and the formula for calculating the settlement of soil in the exhaust stage is deduced.Finally,the negative friction of the pile side is obtained according to the relationship between the settlement of soil around the pile,the axial force,and the negative friction.The rationality of the proposed method is then verified through relevant case studies.The results show that the proposed calculation method is feasible and enriches the calculation model of negative friction of the pile side.

关 键 词：桩基础 非饱和土固结 荷载传递 湿陷性黄土 负摩阻力 

分 类 号：TU443[建筑科学—岩土工程]