在深基坑工程中，常采用“钻孔灌注桩+内支撑”的支护形式进行基坑支护，但不同的支撑布置对基坑的支护效果不同。依托长治市某快速通道改扩建工程中一个基坑工程，利用ABAQUS对不同的钢支撑布置方案进行开挖全过程数值模拟，分析不同内支撑布置方案对基坑开挖周边地表土体的沉降、支护结构水平位移以及基坑坑底隆起的影响，并结合现场监测结果，对模型的可靠性进行验证。研究结果表明：数值模拟结果能够比较准确地反映基坑开挖支护过程中基坑的变形规律和特性；内支撑布置深度较小时，对支护桩最大水平位移和坑外地表沉降有较好的控制效果；内支撑布置深度较大时，对坑底最大隆起有一定的控制效果；增加内支撑的数量对减小支护桩最大水平位移和坑底最大隆起有不同程度的效果。

In deep foundation pit engineering, the support form of "bored pile + internal support" is often used for foundation pit support, but the support effect of different support arrangements on the foundation pit is different. Relying on a foundation pit project in a fast-track reconstruction and expansion project in Changzhi City, ABAQUS was used to numerically simulate the whole process of excavation of different steel support layout schemes, and the influence of different internal support layout schemes on the settlement of the surface soil around the excavation of the foundation pit, the horizontal displacement of the supporting structure and the uplift of the bottom of the foundation pit were analyzed, and then the reliability of the model was verified by combining the field monitoring results. The results show that the numerical simulation results can accurately reflect the deformation law and characteristics of the foundation pit in the process of excavation and support. When the depth of the internal support arrangement is small, it has a good control effect on the maximum horizontal displacement of the supporting pile and the surface settlement outside the pit. When the depth of the internal support arrangement is large, the maximum uplift at the bottom of the pit has a certain control effect. Increasing the number of internal supports has different effects on reducing the maximum horizontal displacement of the supporting pile and the maximum uplift at the bottom of the pit.