首页|超深基岩基坑分段支护及底板抗浮控制技术

超深基岩基坑分段支护及底板抗浮控制技术

扫码查看
超深基岩基坑具有岩层种类多样、破坏形式复杂、裂隙水丰富等特点.青岛国际院士研究院南延项目超深基岩基坑深度达 32.2m,基坑地层自上而下为素填土+粉质黏土及强、中、微风化花岗岩.中风化花岗岩区域设计了灌注桩+锚杆和钢管桩+锚杆 2 种支护形式,运用有限元软件ABAQUS模拟分析 2 种支护形式的侧向刚度差异.结合分析结果,现场基坑支护采取复合土钉墙、灌注桩+锚杆及钢管桩+锚杆组合支护方案.考虑到岩层裂隙水影响,结构底板抗浮设计了一种主动与被动相结合的抗浮方案,主动抗浮措施采用肥槽回填时设置的永久排水系统,被动抗浮措施采用传统抗拔锚杆,效果良好.
Segmented Support of the Ultra-deep Bedrock Foundation Excavation and Anti-floating Control Technology of Bottom Plate
The ultra-deep bedrock foundation excavation has the characteristics of diverse rock layers,complex failure modes,and abundant fissure water.The depth of the ultra-deep bedrock foundation excavation of the south extension project of Qingdao International Academician Research Institute is 32.2 meters.The foundation excavation strata from top to bottom are composed of plain fill soil,silty clay,and strong,medium,and slightly weathered granite.The two support forms with cast-in-place pile+anchor rod and steel pipe pile+anchor rod were designed for the moderately weathered granite area.Using finite element software ABAQUS to simulate and analyze the difference in lateral stiffness between two types of support forms.Based on the analysis results,combined support scheme of composite soil nail walls,cast-in-place piles+anchor rods,and steel pipe piles+anchor rods was adopted for the on-site foundation excavation support.Considering the influence of rock fissure water,a combination of active and passive anti-floating scheme was designed for the structural bottom plate.The active anti-floating measures adopt the permanent drainage system when the fertilizer tank is backfilled,while the passive anti-floating measures adopt traditional anti-pull anchor rods,the effect is good.

foundation excavationultra-deep bedrockfissure watercombined supportsanti-floatingfinite element analysis

张新、邵伟汉、王俊增

展开 >

山东建筑大学土木工程学院,山东 济南 250101

山东三箭建设工程管理有限公司,山东 济南 250101

基坑 超深基岩 裂隙水 组合支护 抗浮 有限元分析

2024

施工技术(中英文)
亚太建设科技信息研究院 中国建筑设计研究院 中国建筑工程总公司 中国土木工程学会

施工技术(中英文)

影响因子:1.244
ISSN:2097-0897
年,卷(期):2024.53(12)