基于土体小应变本构模型的TRD工法成墙试验数值模拟

发布时间：2018-10-09 19:35

【摘要】：等厚度水泥土搅拌墙技术即TRD工法,近年来在深基坑工程中得到了广泛应用。以上海国际金融中心基坑工程开展的0.7 m厚、8 m宽、56.7 m深TRD成墙试验为背景,采用有限元方法,并基于土体小应变本构模型对其成墙过程进行了模拟,得到了土体侧向位移和地表沉降曲线,并与实测数据进行了对比。结果表明,距离墙体5 m处两者的土体侧向位移曲线基本一致,而距离墙体1.4 m处的土体侧向位移在深度大于20 m后的计算结果较实测值偏小;地表沉降在靠近墙体处最大,随着距墙体的距离增大而逐渐减小。最后分析了成墙深度对地表沉降和土体侧向变形的影响,结果表明,深度越深,引起的土体侧向变形和地表沉降也越大。通过不同成墙深度引起的地表沉降归一化曲线可看出,TRD成墙引起的最大地表沉降约为0.05%H(H为成墙深度),沉降影响区域约为1.8H。
[Abstract]:The technology of equal thickness cement soil mixing wall (TRD method) has been widely used in deep foundation pit engineering in recent years. Based on the experiment of 0.7 m thick and 8m wide 56.7 m deep TRD wall of Shanghai International Finance Center, the wall forming process is simulated by using finite element method and based on the small strain constitutive model of soil. The lateral displacement and surface settlement curves of soil are obtained and compared with the measured data. The results show that the lateral displacement curves of the two soils are basically the same at 5 m from the wall, while the calculated results of the lateral displacement of the soil at 1.4 m from the wall are smaller than the measured values, and the surface settlement is the largest near the wall. As the distance from the wall increases, it decreases gradually. Finally, the influence of wall depth on the surface settlement and lateral deformation of soil is analyzed. The results show that the deeper the depth, the greater the lateral deformation and surface settlement of soil. Through the normalization curve of surface settlement caused by different depth of wall formation, it can be seen that the maximum surface settlement caused by TRD wall is about 0.05H (H is the depth of wall formation), and the area affected by settlement is about 1.8H.
【作者单位】：同济大学土木工程学院;同济大学岩土及地下教育部重点实验室;华东建筑设计研究总院地基基础与地下工程设计研究中心;华东建筑设计研究总院上海基坑工程环境安全控制工程技术研究中心;
【基金】：上海市科委工程技术研发中心平台建设项目(No.13DZ2251400)
【分类号】：TU753

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