摘要
通过对福州地区近20个项目的深厚软土物理力学指标的统计,了解软土指标性质随深度变化规律,并基此分析了软土抗剪强度指标对基坑变形、内力及稳定性的影响。分析结果表明:随着深度的增大,天然含水率、孔隙比均呈逐渐减少趋势,抗剪强度指标随深度则呈现显著的增大趋势;深厚软土抗剪强度指标分层量化,将更准确反映围护结构的变形及内力值,且在确保支护结构安全的前提下,可减少围护结构嵌固深度,提高基坑支护结构的经济性。
Based on the statistics of physical and mechanical indexes of deep soft soil of nearly 20 projects in Fuzhou,the change law of the properties of soft soil indexes with depth is understood,and the influence of shear strength indexes of soft soil on the deformation,internal force and stability of foundation pit is analyzed.The results show that with the increase of depth,the natural water content and void ratio decrease gradually,while the shear strength index increases significantly with the depth;the shear strength index of deep soft soil is quantified in layers,which will more accurately reflect the deformation and internal force of the retaining structure.At the same time,the layered quantification can reduce the embedment depth of the retaining structure and improve the economy of the foundation pit supporting structure on the premise of ensuring the safety of the supporting structure.
作者
张升锋
ZHANG Shengfeng(Fujian Academy of Building Research CO.,LTD,Fuzhou 350108;Fujian Key Laboratory of Green Building Technology,Fuzhou 350108)
出处
《福建建筑》
2020年第7期51-54,共4页
Fujian Architecture & Construction
关键词
基坑支护
深厚软土
分层量化
抗剪强度指标
Foundation pit support
Deep soft soil
Stratified quantification
Shear strength index
