摘要
为讨论复合土钉墙支护基坑在实际工程中的受力机理,借助基于离散元法的颗粒流软件PFC^2D,引入颗粒流理论和开发颗粒流细观数值模拟技术,从细观角度对复合土钉支护的力学机理进行研究。通过离散元方法建立复合土钉颗粒流模型,并与纯土钉支护和纯搅拌桩支护的受力进行对比,发现复合土钉支护时土钉轴力的分布形式和大小与纯土钉支护有很大不同,且桩墙所受的弯矩和剪力分布也异于纯搅拌桩支护。研究表明利用离散元法进行力学分析,能为复合土钉墙支护基坑的机理研究提供新的思路和方法。
In order to discuss the mechanical mechanism of composite soil nailing wall supporting foundation pit in prac- tical projects, it was based on discrete element method of PFC2D, and the introduction of particle flow theory and development of particle flow in mesoscopic numerical simulation technology, to conduct the mechanics studies about its mechanism from me- soscopic aspect for composite soil nailing supporting. The particle flow code model for composite soil nailing supporting was es- tablished by discrete element method, which compared with nailing supporting only and cement-soil pile supporting only, there were much difference about axial force and its distribution between composite soil nailing supporting and nailing supporting on- ly. What＇s more, the distribution of bending moment and shear stress is different from cement-soil pile supporting only. So. the results show it offers a new approach and method for mechanism study of composite soil nailing wall supporting foundation pit by using discrete element method.
出处
《岩土工程技术》
2012年第6期300-305,共6页
Geotechnical Engineering Technique
关键词
复合土钉
基坑
离散元法
力学研究
composite soil nailing
foundation pit
discrete element method（DEM）
mechanics studies
