基坑锚杆与土钉复合支护的FLAC数值分析

Numerical Analysis on the Composite Support Techinque of Prestressed Anchor Arm and Brad by FLAC

摘要:

预应力锚杆+土钉复合支护技术在基坑工程中的应用已越来越广泛。本文以郑州市王家寨基坑工程为实例,采用FLAC数值分析法建立了基坑锚杆与土钉复合支护计算模型。对土体选取理想弹塑性本构模型,对预应力锚杆和土钉选取cable单元,同时考虑支护体系与土体之间的相互作用,对基坑的开挖支护的动态过程进行了模拟分析,研究了基坑开挖对土体的扰动、基坑位移变化以及土钉和锚杆的内力分布规律。研究结论对锚杆与土钉复合支护设计具有一定借鉴意义。

Abstract:

The composite support technique of prestressed anchor arm and brad has been more and more widely used in foundation pit excavating.Taking a deep foundation excavation at Wangjiazhai,Zhengzhou city as an example,the computation model for the composite support technique of prestressed anchor arm and brad is established using FLAC numerical analysis method.The dynamic process of foundation excavating and support,considering the mutual effect between the support system and soil mass,is simulated.The destabilization of excavation on soil,the displacement change of foundation pit and inner force of brad and prestressed anchor are studied.The conclusions had some reference value for design and construction of the upport technique.