石家莊裕園大廈深基坑支護(hù)工程三維數(shù)值分析
楊生彬
- 摘 要
-
(中國地質(zhì)大學(xué)(北京)工程技術(shù)學(xué)院北京 100083)［提要］結(jié)合深基坑土釘墻支護(hù)工程實例，應(yīng)用國際通用的有限差分分析軟件—FLAC 3D程序，分析了基坑分步開挖與支護(hù)的受力、變形模式，模擬了土-土釘-面層協(xié)調(diào)作用的支護(hù)效果。數(shù)值模擬結(jié)果表明，隨著基坑開挖深度的增加和支護(hù)體系的不斷實施，支護(hù)體受力也逐漸下移，基坑開挖結(jié)束后受力主要集中在沿基坑深度的中間部位，同時土釘受力均以軸向拉力為主且遠(yuǎn)小于其抗拉屈服強(qiáng)度，說明支護(hù)設(shè)計是偏于保守的。將模擬結(jié)果與支護(hù)實測數(shù)據(jù)對比，二者基本吻合，說明合理運(yùn)用數(shù)值分析方法可為工程優(yōu)化設(shè)計提供科學(xué)依據(jù)。［關(guān)鍵詞］土釘墻 三維數(shù)值分析 有限差分法3D Numerical Analysis on Deep Foundation Pit Support Engineering in Shijiazhuang Yuyuan Mansion/Yang Shengbin(School of Engineering & Technology, China University of Geosciences, Beijing 100083, China)Abstract:Based on an engineering project, the finite difference method, FLAC 3D program is used to analyze the mechanic process and the deformation mode of the pit support engineering, and to model the cooperative function of soil-nail-surface. The numerical analysis results show that the force of soilnailing moves down with the excavation depth increasing, the half depth of the pit is the main working area at the end of excavation, and the design is conservative because the axial force of soil nailing is far less than its ultimate tensile strength. Meanwhile, the numerical analysis results including the pit displacement and the mechanics of soil nailing are matched with the measured data on the whole, which can provide scientific reference to optimize the design of similar engineering.Keywords:soil nailing wall; 3D numerical analysis; finite difference method
