This paper takes HeFei Metro Line1 , Line2 subway transfer station deep excavation engi-neering as the background, using FLAC3D to establish the model, simulating the process of excava-tion, what'''' s more,the supporting systems of deep foundation pit are analyzed, considering the inter-action between supporting structure and soil, calculating and analysing of the diaphragm wall internal forces and deformation, and by comparing the calculation results of various working conditions, the distribution law of the unsymmetrically loading and irregular diaphragm wall of internal force and de-formation were obtained. The calculation and analysis results showed that the main stress of deep foundation pit supporting structure of irregular is bigger than the straight arm'''' s, and the stress con-centration phenomenon is more obvious, the horizontal deformation is larger than the arm'''' s under the same conditions, the force and deformation for unsymmetrically loading and irregular is worst case in deep pit. The results of the study which is for future subway station deep foundation pit engineering design, construction provide the basis necessary reference.%以合肥地铁1号线、2号线换乘站大东门地铁偏压异型深基坑工程为背景,采用FLAC3D建立数值计算模型模拟开挖施工过程,考虑支护结构与土体的相互作用,计算和对比分析偏压异型深基坑地下连续墙的内力和变形,得到其分布规律.结果表明:深基坑支护结构异型点的主应力比直臂部分的主应力大,而且应力集中现象也较为明显,水平方向的变形比同等条件下直臂部分也要大,异型部分的受力和变形都是深基坑的最不利情况.
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