摘要
为探究应变硬化(HS)及小应变硬化(HSS)本构模型对深基坑支护结构变形与受力的影响,以长春地区某深基坑工程项目为例,通过室内试验获得HS与HSS本构模型参数,利用有限元软件midas GTS NX对其排桩支护结构水平位移及内支撑轴力进行数值模拟,并与实际监测数据进行对比分析。结果表明:长春地区粉质黏土HS与HSS本构模型的参考切线、割线及加卸载模量与压缩模量之间的关系为:参考加卸载模量约为压缩模量、参考切线模量以及参考割线模量的3.6倍;HS与HSS本构模型下排桩支护结构水平位移与实际监测数据之间的变化规律基本一致,均呈现“鱼腹型”,仅在数值上存在差异;HSS本构模型结果与实际监测值对比,排桩水平位移模拟结果误差为1.03%~10.32%,内支撑轴力模拟结果误差为6.48%~14.72%,相较于HS本构模型在反应卸荷条件下粉质黏土特性、支护结构变形与受力方面相对更为准确。
Hardening soil model(HS)and Hardening-soil with small strain model(HSS)constitutive models has been widely used in the numerical simulation of deep foundation pit excavation,and the investigation of their influence on the deformation and force of deep foundation pit supporting structure can provide theoretical reference and guidance for the design and construction of deep foundation pit supporting structure.By taking a deep foundation pit project in Changchun as the background,the parameters of HS and HSS constitutive models are obtained through indoor tests,and the horizontal displacement and axial force of internal support of the row pile support structure are numerically simulated by using the limited element software midas GTS NX,and compared and analyzed with the actual monitoring data.The results show that the relationship between the reference tangent line,cut line and unloading modulus and compression modulus of the HS and HSS ontological model of the silty clay in the Changchun area is E_(ur)^(ref)≈3.6 E_(s)^(1-2)≈3.6E_(50)^(ref)≈3.6E_(oed)^(ref).The change rule between horizontal displacement of pile supporting structure and actual monitoring data under HS and HSS constitutive model is basically the same,showing"fish-belly type",and there are only numerical differences;comparing the results of HSS constitutive model and actual monitoring values,the error of simulation results of horizontal displacement of pile is 1.03%~10.32%,and the error of simulation results of axial force is 6.48%~14.72%,compared with HS constitutive model,which is relatively more accurate in responding to the characteristics of powdery clay,deformation and force of supporting structure under unloading condition.Comparing the HSS model results with the actual monitoring values,the simulation error of horizontal displacement of row piles is 1.03%~10.32%,and the simulation error of axial force of inner support is 6.48%~14.72%,which is more accurate than the HS model in the reaction to the characteristics of silty clay under unloading condition,and the deformation and force of supporting structure.
作者
郭浩天
孙庆林
苑成旺
李向群
李继伟
GUO Haotian;SUN Qinglin;YUAN Chengwang;LI Xiangqun;LI Jiwei(School of Geometrics and Prospecting Engineering,Jilin Jianzhu University,Changchun,Jilin 130118,China;Institute of Geotechnical Engineering in the Seasonal Frozen Zone,Jilin Jianzhu University,Changchun,Jilin 130118,China;College of Construction Engineering,Jilin University,Changchun,Jilin 130012,China;Beijing Urban Construction Survey and Design Research Institute Co.,Ltd.,Beijing 100101,China)
出处
《水利与建筑工程学报》
2025年第1期71-79,共9页
Journal of Water Resources and Architectural Engineering
基金
吉林省科技发展计划项目(YDZJ202201ZYTS490)
第七届中国科协青年人才托举工程(2021QNRC001)。
作者简介
郭浩天(1991-),男,讲师,主要从事土体工程地质等方面研究工作。E-mail:guohaotian@163.com;通讯作者:孙庆林(1999-),男,硕士研究生,研究方向为土体工程地质方面。E-mail:965980258@qq.com。
