方形筏基天然地基沉降快速估算初步研究

Preliminary research on quick estimation of subsoil deformation of square raft foundation

《建筑地基基础设计规范》(GB 50007—2011)中规定采用分层总和法来计算天然地基的沉降,计算过程比较复杂。为了快速地估算地基沉降数值,以方形基础、单一土层天然地基为背景分析了地基沉降数值随基础尺寸、土层压缩模量的变化规律。根据计算结果拟合出了地基沉降的快速估算经验公式,同时给出了地基压缩层深度的快速估算公式。采用本文给出的公式,可以快速地估算出方形筏基沉降和压缩层深度的大致数值,给结构工程师提供便利。

Code for design of building foundation( GB 50007—2011) requires that subsoil deformation should be calculated using layer summation method,which has a complicated procedure. To estimate subsoil deformation quickly, varying laws of subsoil deformation with foundation size and compressive modulus were analyzed on the background of square foundation and single soil layer. Quick estimation formula of subsoil deformation was concluded,and also that of compressed layer depth. Using these empirical formulas,structural engineers can calculate the approximate value of subsoil deformation and compressed layer depth conveniently.