复合土钉支护基坑的细观模拟研究  

Mesoscale Simulations of Composite Soil Nailed Wall for the Supporting of Deep Excavations

作　　者：王涛[1] 熊传祥[1] 

机构地区：[1]福州大学环境与资源学院,福州350001

出　　处：《土工基础》2013年第1期52-55,58,共5页Soil Engineering and Foundation

摘　　要：基于离散元法颗粒流软件PFC2D,从细观角度对复合土钉与土体间相互的作用机理进行研究。根据水泥土搅拌桩复合土钉支护构造的特点,建立基坑的颗粒流模型,对基坑桩墙变形情况进行研究,并对整个开挖过程土体的应力状态、孔隙率、微裂隙等的变化进行细观分析。结果表明支护结构的变形与实际监测数据较为符合,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。Due to the complexity and the importance of the stress-strain mechanism in the composite soil nailed wall supporting system, the interaction between the soil nailing and the soil mass is approached from the mesoscale simulations by using the theory of particle flow and it associated discrete element software, PFC2D. The new approach bypasses the macro continuity hypothesis of the traditional continuum mechanics model. The wall deformations of a deep excavation site supported by the soil cement mixed wall and soil nailing are numerically simulated by the discrete element method. The change of the stress-strain, pore water pressure and the micro cracks in the soil mass during the excavation are also numerically monitored. The analytical results are close to the observed values.

关 键 词：复合土钉 基坑 离散元法 细观模拟 

分 类 号：TU472[建筑科学—结构工程]