湿陷性黄土场地大型储罐基础设计  

Foundation design of large storage tank in collapsible loess ground

作　　者：郭东[1] 郭明 GUO Dong;GUO Ming(CSCEC Northwest Design&Research Institute Co.,Ltd.,Xi’an 710018,China;Changqing Engineering Design Co.,Ltd.,Xi’an 710018,China)

机构地区：[1]中国建筑西北设计研究院有限公司,西安710018 [2]长庆工程设计有限公司,西安710018

出　　处：《建筑结构》2024年第4期55-60,40,共7页Building Structure

摘　　要：结合在湿陷性黄土场地上建设的10万方大型钢储罐工程,从基础选型、承载力设计、地基处理、充水预压、沉降观测等方面进行了深入的分析和研究,并从经济性、施工可操作性等方面进行地基处理方案比选,确定采用孔内深层强夯桩+灰土石垫层,提出对含水率较低的湿陷性土层进行预增湿技术,使土层达到最优含水率,解决桩沉管不易、拔管困难、较难消除湿陷性的问题,充水预压后进行沉降观测,结果表明地基沉降随充水荷载增大而增大,在15d后趋于稳定,且储罐四周沉降大于中心点,但沉降量均小于估算值,地基处理效果达到预期。Based on the construction of a 10×104m3 large steel storage tank project on a collapsible loess site,in-depth analysis and research were conducted from the aspects of foundation selection,bearing capacity design,foundation treatment,water filling and preloading,settlement observation,etc.The foundation treatment plans were compared from the aspects of economy and construction operability.It was determined to use deep dynamic compaction pile in hole+lime soil cushion,and pre-humidification technology was proposed for collapsible soil layers with low moisture content.To achieve the optimal moisture content of the soil layer and solve the problems of difficult pile sinking,difficult pipe pulling,and difficulty in eliminating collapsibility,settlement observation was carried out after water filling and preloading.The results show that the foundation settlement increases with the increase of water filling load and tends to stabilize after 15d.The settlement around the storage tank is greater than the center point,but the settlement is smaller than the estimated value.The foundation treatment effect has reached the expected level.

关 键 词：湿陷性黄土场地 10万方储罐 地基处理 孔内深层强夯桩 增湿 沉降 

分 类 号：TU472.32[建筑科学—结构工程] TU476.9[建筑科学—土工工程]