深基坑工程造价高、工程量大、技术难度大,具有不可预见性.本文首先介绍了某超深基坑工程地质情况,提出多个超深基坑支护方案,结合工程造价、施工工期、场地特点等多种因素比选出最佳超深基坑设计方案,复合土钉墙用于工程实践.计算内容包括:复合土钉墙支护结构计算、基坑的抗滑移稳定性、抗隆起稳定性和抗倾覆稳定性计算、围护墙的内力和变形计算、支撑体系的内力和变形计算.%Deep foundation pit engineering, owing to its high cost and difficult technology, is hard to predict its foreseeability. In this paper, the basic geological condition of one project of deep foundation pit engineering is introduced, and several support schemes for ultra-deep foundation construction are put forward. Many factors, namely cost, construction period, site peculiarities, are compared to select the best ultra-deep foundation construction plan. Composite soil-nailed walls are used in practice, calculation content mainly includes; supporting structure calculation for composite soil-nailed walls; anti-sliding stability for foundation pits; heave stability and overturning stability calculation; internal force and transformation calculation for enclosure walls; internal force and transformation calculation for supporting structure.
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