摘要
深厚软土地基中群桩沉降的预测一直是工程设计中的难点。本文分析了群桩基础中应力扩散的规律,提出了桩端附加应力的简化计算方法,指出国家桩基规范计算的桩端压缩层厚度偏大。讨论了目前国家建筑桩基技术规范中关于群桩沉降计算中的几个问题,包括压缩层厚度、模量取值、应力计算等,提出了相应的群桩沉降计算方法,并和工程实测数据进行了比较。
In the geotechnical engineering design, it was difficult yet to estimate the settlement of pile - group in the deep soft soil. The spread regularity for the stresses in the pile - group foundation is analyzed in the paper, the simplified calculation method for additional stress at the bottom end of pile is presented, and the thickness for compressibility of substratum at the bottom end of pile, which was overestimated in National Code of Pile Foundation Design, has been pointed out. Some problems in the current National Code of Pile Fundation Design including the thickness for compressibility of substratum, the value of modulus, the calculation of stress etc. , are discussed, meanwhile, the corresponding calculation method for the settlement of pile - group, which has been compared with the measured data of practical engineeing proiect, is put forward.
出处
《土木工程学报》
EI
CSCD
北大核心
2003年第10期89-94,共6页
China Civil Engineering Journal
关键词
群桩
基础沉降
软土地基
沉降预测
压缩层厚度
Pile, pile foundation, pile - group foundation, estimation of setdement
