深基坑开挖过程中土钉支护结构的变形与受力特性分析  

Deformation and Stress Characteristics Analysis of Soil Nailing Support Structure During Deep Excavation

作　　者：杨继红 丁鹏 杨兴隆 YANG Jihong;DING Peng;YANG Xinglong(School of Earth Science and Engineering,North China University of Water Resources and Electric Power,Zhengzhou,He’nan 450046,China)

机构地区：[1]华北水利水电大学地球科学与工程学院

出　　处：《水利与建筑工程学报》2019年第6期133-136,共4页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金青年基金项目(41102203);河南省高等学校青年骨干教师资助计划项目(2014GGJS-067)

摘　　要：基坑开挖过程中的变形在工程中有很重要的意义。以郑州市某深基坑工程为例,利用岩土数值分析软件FLAC3D对开挖支护过程进行了模拟,深入分析了基坑位移场分布规律以及土钉支护结构的受力特性,结合现场监测资料对比分析,结果表明:随着基坑开挖的越深,坡顶土体向基坑内侧移动,开始偏移的速率快,逐渐变得平稳,最后趋于稳定;随着基坑开挖的越深,坡顶的隆起逐渐变为沉降,坡顶竖向位移速率也是由快趋于稳定;开挖完成后,第四排土钉轴力值最大,位置在基坑中下部,此处也是基坑侧壁位移最大的部分。The deformation of foundation pit during excavation is one of the most important issue in engineering. In this paper, a deep foundation pit engineering in Zhengzhou is taken as an example, the geotechnical numerical analysis software FLAC3 D is used to simulate the process of excavating and supporting. And it is also used to analyze the foundation pit displacement field distribution and the mechanical characteristics of soil nailing structure, combined with field monitoring data analysis. The results show that: as the depth of foundation pit excavation increases, the soil at the top of the slope moves towards the inside of the foundation pit. The displacement rate is faster at the beginning, then gradually becomes slower and finally tends to be stable. With the increasing depth of foundation pit excavation, the uplift of slope top gradually begins to subside, and the vertical displacement rate of slope top also tends to be stable. After the excavation stops, the axial force value of the fourth row of soil nailing is the largest, which is located in the lower part of the foundation pit and is also the part with the largest displacement of the side wall of the foundation pit.

关 键 词：深基坑 土钉 受力特性 数值模拟 现场监测 

分 类 号：TU470[建筑科学—结构工程]