复合土钉墙现场测试及数值模拟分析研究
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摘要
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。
This paper presents the deep excavation 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 settlement at the ground surface near the excavation are compared with the measured values.The influences of micropile and seepage 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.
This paper presents the deep excavation 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 settlement at the ground surface near the excavation are compared with the measured values.The influences of micropile and seepage 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.
引文
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[2]秦四清,陈辉,张明中.土钉支护结构有限元法变形与破坏数值模拟分析[J].探矿工程(岩土钻掘工程),2005,32(增刊1):102-105.
[3]孙铁成,张明聚,杨茜.深基坑复合土钉支护模型试验研究[J].岩石力学与工程学报,2004,23(15):2385-2392.
[4]魏焕卫,杨敏,孙剑平.土钉墙变形的实用计算方法[J].土木工程学报,2009,42(1):81-90.
[5]魏焕卫,杨敏,孙剑平.土钉抗拔承载力计算方法[J].水文地质工程地质,2009,229(5):23-26.
[6]段建立,谭跃虎,樊有维.复合土钉支护的现场测试研究[J].岩土力学与工程学报,2004,23(12):2128-2132.
[7]宋二祥,邱玥.基坑复合土钉支护的有限元分析[J].岩土力学,2001,22(3):241-244.