黄土场地水平受荷桩的应变楔计算方法改进  

Improvement of Strain Wedge Calculation Method of Horizontally Loaded Piles in Loess Site

作　　者：潘瑞 罗丽娟[1] 刘安龙 张勋 任翔[1] PAN Rui;LUO Li-juan;LIU An-long;ZHANG Xun;REN Xiang(School of Civil Engineering,Chang'an University,Xi'an 710064,China;Machinery Industry Survey and Design Research Institute Co.,Ltd.,Xi'an 710043,China)

机构地区：[1]长安大学建筑工程学院,西安710064 [2]机械工业勘察设计研究院有限公司,西安710043

出　　处：《科学技术与工程》2023年第21期9219-9225,共7页Science Technology and Engineering

基　　金：国家自然科学基金(41877285,42077248)。

摘　　要：应变楔方法是一种能较好地考虑桩土相互作用和土的非线性本构关系的水平受荷桩理论计算方法,桩-土相互作用模式和土的本构关系是应变楔方法研究的切入点和难点。在已有应变楔模型的研究基础上,结合结构性黄土联合强度,将黄土的抗拉强度引入应变楔法计算中,对桩前应变楔土体的水平应力增量Δσh、发挥摩擦角φm和桩侧剪应力τ做出改进,并通过算例验证了改进计算方法的适用性。计算结果表明:改进计算方法适用于黄土场地水平受荷桩的计算,迭代算法和流程可靠;考虑黄土抗拉强度的水平应力增量Δσh和桩侧剪应力τ的计算值略微偏小,发挥摩擦角φm的计算值会略微偏大,导致考虑黄土抗拉强度的桩顶位移和桩身弯矩最大值比不考虑黄土抗拉强度的计算值略微偏小,但和现场试验实测结果基本一致。The strain wedge method is a theoretical calculation method for horizontally loaded piles that can better consider the pilesoil interaction and the nonlinear constitutive relationship of the soil.The pile-soil interaction model and the constitutive relationship of the soil are the entry points and difficulties in the study of strain wedge method.Based on the current research on the corresponding variable wedge method,combined with the joint strength of the structural loess,the tensile strength of the loess was introduced into the calculation of the strain wedge method to calculate the horizontal stress incrementΔσh,the friction angleφm and the pile side shear stressτ.The applicability of the improved calculation method was verified through a calculation example.The calculation results show that the improved calculation method in this paper is suitable for the calculation of horizontally loaded piles in loess sites and the iterative algorithm and process are reliable.When considering the tensile strength of the loess,the calculated values of the horizontal stress incrementΔσh and the pile side shear stressτare slightly smaller and the calculated value of the exerted friction angleφm is slightly larger,which resulting in the calculated value of the pile top displacement and the maximum value of pile body bending moment are slightly smaller than the calculated value without considering the tensile strength of loess.But it is basically consistent with the actual measurement results of the field test.

关 键 词：应变楔 水平受荷桩 结构性黄土 抗拉强度 桩-土相互作用 

分 类 号：TU470[建筑科学—结构工程]