In the recent times, many studies have been devoted toward rectangular excavations but only a few studies have considered the “corner effect” in the optimized design of soil nail wall-retaining pile-anchor cable supporting systems, especially in large-scale deep foundation pit environments excavated by the central-island technique. Corner effect not only increases the construction costs but also may pose a risk to the safety and stability of such pits. In this paper, changes in the lateral displacement of retaining pile, soil at 1 m away from the foundation pit, crown beam, and the settlement of ground surface and surrounding buildings were extensively investigated based on the field measurements and numerical simulations of a large-scale deep foundation pit in Gaoxin zone, Xi’an, China. In addition, the supporting structure was optimized by considering the lateral influence zone of the corner effect. The optimization scheme proposed in this study not only satisfies the safety requirements of foundation pit supports, but also reduces the construction costs.

近年来，许多研究致力于矩形开挖，但是只有少数研究认为土钉墙固位桩锚索支护系统的优化设计中的“拐角效应”，特别是在大型深基坑中中岛技术挖掘的环境。拐角效应不仅增加了建造成本，而且还可能对这种坑的安全性和稳定性造成威胁。本文基于现场测量和大型建筑物的数值模拟，广泛研究了挡土桩的侧向位移，距基坑1 m处的土壤，拱顶梁以及地表和周围建筑物的沉降的变化。西安市高新区的大型深基坑。此外，考虑角效应的横向影响区来优化支撑结构。本研究提出的优化方案不仅满足基坑支护的安全要求，而且降低了建设成本。