微型桩-锚杆-土钉复合支护结构相互作用分析-《郑州大学学报(工学版)》

文章信息/Info

Title:: Interaction Analysis of Micropile-anchor-soil Nailing Compound Structure

Author(s):: YAN Fuyou; GAO Wei; ZHOU Tonghe; 1. School of Civil Engineering, Zhengzhou University, 2hengzhou 450001 , China; 2. Multi-Functional Design and Research A.eademy of Zhengzhou University,Zhengzhou 450002,China

Keywords:: foundation pit supporting; miero-pile ; compound supporting structure ; field test; numerical simulation

摘要:: 结合郑州—基坑工程项目,应用分布式光纤传感技术对土钉和锚杆的轴力进行监测,根据实测数据分析土钉和锚杆轴力随基坑开挖而变化的规律.运用FLAC3D软件建立两种复合土钉支护结构的三维模型,进行开挖支护施工过程的三维动态模拟分析,并通过两种模型的对比分析得出微型桩在复合土钉支护结构中的作用.最后把数值分析结果与现场实测结果相比较.结果表明,这种复合支护结构可以充分发挥锚杆的锚固作用.微型桩能有效控制基坑的稳定性与变形,并能改善土钉和锚杆受力状态.基坑侧壁水平位移最大处几乎与微型桩最大正弯矩处相重合,最大负弯矩处近似在基坑边壁坡脚处.

Abstract:: In a foundation pit engineering project in Zhengzhou, we monitored the axial force of soil nail andanchor by distributed optical fiber sensor, according to measured date ,and the role of the change of axial forceis discussed. The computation models for two compound soil nail supporting systems are established usingFL.AC3 D, and a construction process simulation of foundation excavating and support is conducted. Throughcomparative analysis of two models, the role of the micro-pile in the compound support structure can bedrawn, lastly, the simulation results were compared with the measured results, The results show that thiscompound supporting structure can give full play to the role of anchorage. Micro-pile can effectively control thestability and deformation of foundation ,and it can improve the stress status of soil nail and anchor force. Mean.while, the largest horizontal displacement of the foundation pit wall almost coincides with the most positivebending moment of micro-piles and maximum in the negative moment approximately coincides with slope feet offoundation pit side wall.