复合土钉墙现场测试及数值模拟分析研究

整理分析了济南西部新城某地下车库基坑的复合土钉墙支护结构现场监测数据,采用有限元软件ABAQUS建立基坑支护结构单元三维模型,模拟了其开挖支护施工过程,动态分析基坑边坡坡顶地表水平位移、沉降变化规律,并与现场监测值进行对比,分析了微型桩与止水帷幕对复合土钉墙的影响。表明由土钉、止水帷幕、微型桩、预应力锚杆与土体相互作用的有限元力学模型能较好模拟复合土钉墙支护施工过程,结果可供同类复合土钉墙设计施工提供参考。

Field Testing and Numerical Analysis of a Composite Soil Nailing Wall

This paper presents the deep excaw~tion monitoring results of an underground parking garage of West Jinan New City project. The deep excavation was supported by the composited soil nail walls. The excavation and the supporting progresses are simulated by the three dimensional finite element analysis using ABAQUS. The simulated lateral displacement and vertical set- tlement at the ground surface near the excavation are compared with the measured values. The influences of micropile and seep- age cut-off wall on the performance of the composite soil nail wall are also analyzed. The results indicate that the numerical model that includes the soil nail, seepage cut-off wall, micropile, and prestressed ground anchor can reasonably simulate the progress of the deep excavation supported by the composite soil nails.