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深大基坑的开挖支护内支撑体系中,一种斜抛撑的形式被越来越广泛地应用。通过大型通用有限元软件ABAQUS对支撑桩加承台的斜抛撑形式在深大基坑中的应用进行研究分析,并与常规应用的水平撑在深大基坑中的数值模拟结果进行对比,重点分析了基坑开挖过程中周围土体的应力状态与支护结构受力,同时比较两种不同的内支撑体系深大基坑外地表面土体沉降、基坑底部土体隆起及围护桩的水平位移不同变化情况,探讨斜抛撑的支护结构受力机理,并且得出支撑桩加承台的斜抛撑支护体系在控制围护桩水平位移和基坑外地表面土体沉降的优点及控制效果。
In deep excavation support inner support system, a form of oblique throwing is more and more widely used. Through the application of ABAQUS, a large-scale general finite element software, the application of inclined slat-throwing support in deep deep foundation pit with support pile and cap was analyzed and compared with the numerical simulation results of conventional horizontal support in deep foundation pit. The stress state of the surrounding soil and the supporting structure are analyzed emphatically. At the same time, the settlement of the soil on the surface of the deep foundation pit with two different types of internal support system is compared with that of the soil at the bottom of the foundation pit The horizontal displacement of the piles and the variation of the horizontal displacement of the piles and the stress mechanism of the support structure of the inclined piles are discussed. The results show that the inclined piles support system with the support piles and the caps in controlling the horizontal displacement of the piles and the settlement of the soil in the surface of the foundation pits The advantages and the control effect.