摘要
为研究软土深基坑土体本构模型适用性及其参数选取等问题,采用数值模拟的方法,分析深圳地区软土深基坑开挖过程中土体在几种常用土体本构模型的主要应力变化路径,并将计算结果与实测数据进行对比验证。研究表明,在计算地下连续墙的变形曲线及地面沉降曲线时,摩尔-库伦模型的计算结果相较实测值误差分别为20.3%、32.9%;修正剑桥模型的计算结果误差分别为11%、25.2%,与实际结果更吻合。在此基础上,进一步研究本构模型参数对计算结果的敏感性,得出关键参数与地层及围护结构变形演化特征之间的关系。
In order to study the selection of soil constitutive model and its parameters when calculating the excavation problem of deep foundation pit at soft soil by numerical simulation, numerical simulation method was adopted to analyze the soil mass in the process of deep foundation pit excavation at soft soil area in Shenzhen. The main stress change paths of commonly used soil constitutive models were compared with the measured data to verify the applicability of common soil constitutive models in the numerical calculation. The results show that when calculating the deformation curve of the diaphragm wall and the ground settlement curve, the calculation results of the Mohr-Coulomb model have 20.3% and 32.9% errors respectively by comparing the measured values. The calculation results of the Clay model have an error of 11% and 25.2% respectively, which are more consistent with the actual results. On this basis, the sensitivity of the parameters of the constitutive model was further studied, and the relationship between the key parameters and the deformation evolution characteristics of the stratum and retaining structure was obtained.
作者
曲强
李昊波
Qu Qiang;Li Haobo(China Railway Engineering Design and Consulting Group Co.,Ltd.,Beijing 100055,China)
出处
《铁道勘察》
2022年第3期94-99,106,共7页
Railway Investigation and Surveying
关键词
软土
深基坑
本构模型
数值模拟
参数分析
支护结构
soft soil
deep foundation pit
constitutive model
numerical simulation
parameter analysis
supporting structure
