深厚淤泥质地层中深基坑支护结构敏感性分析

Sensitivity Analysis of Deep Foundation Pit Supporting Structure of Large Metro Station in Deep Muddy Stratum of Prosperous Urban Area

依托深圳地铁10号线中益田停车场大跨深基坑工程,基于不同材料参数的敏感性分析,针对海相软土地层大跨深基坑开挖的变形特性与有效的控制措施,研究了海相软土工程力学特性、围护结构空间效应等多方面因素对深基坑施工失稳破坏的影响,进而针对不同失稳破坏机理提出了围护结构变形的预防措施。分析结果表明:(1)在围护结构空间效应中,地下连续墙的厚度对地下连续墙变形的影响最大,围护结构的参数对支撑应力影响并不明显;(2)在深基坑施工时空效应中,地下连续墙的深度对其侧移影响最大,其次是支护顺序;(3)基于以上分析结论,提出了深基坑施工失稳的控制措施。

Relying on the large - span deep foundation pit project of Zhongyida Parking Lot on Shenzhen Metro Line 10, based on the sensitivity analysis of different material parameters, the large - span deep foundation pit projeet of Zhongyitian parking lot of Shenzhen Metro Line 10 is aimed at the deformation characteristics and effeetive eontrol measures for large - span deep foundation pit excavation in marine soft soil layer. The effects of mechanical properties of marine soft soil engineering and spatial effeets of retaining strueture on the instability failure of deep foundation pit construction are studied. The preventive measures for deformation of retaining structure are proposed for dirt）rent failure mechanism. The analysis results show that： （1）In the spatial either of the retaining structure, the thickness of the underground eontinuous wall has the greatest ilffluenee on the deformation of the underground continuous wall, and the parameters of the retaining structure have no obvious influence on the supporting stress;（2）Construetion in the deep foundation pit In the space - time effect, the depth of the underground continuous wall has the greatest influence on its lateral displacement,followed by the support sequenee;（3）Based on the above analysis conclusions,the control measures for the instability of deep toundation pit construction are proposed.