山东建筑大学学报2017，Vol.32Issue(1)：12-20,9.
基于虚拟嵌固点法的桩基稳定性数值分析
Numerical analysis of the plies bucking stability based on illusion embedded solid point method
摘要
Abstract
The underpinning pile can be used to support the existing building for construction of basement.The soil excavation around the pile can decrease the bearing capacity of piles.Therefore,it is especially important to study the stability of the plies bucking stability under the condition of pile soil excavation.For the lack of the formula of calculation length of compressed pile under the states that the part haff-embedded pile depth in soil,ANSYS finite element analysis program was used to analyze the stability characteristics of pile under the excavation condition.A formula of calculation length of compressed pile is put forward under the states that the part of pile depth in soil is haffembedded,and the verification is carried out.The results show that,with the increase of pile depth in soil,the stability coefficient of pile reaches a certain value,which is so called critical value of depth in solid.This conclusion fits the assumption of illusion embedded solid point method.Under the same excavation depths condition,the pile has the higher value of stability coefficient in wider pile diameter,the higher level of soil reaction force coefficient,the shorter length of compressed pile or the stronger constraint on top of pile.Under the same pile lengthens condition,the bearing characteristics of pile decreases with the soil excavation.This paper puts forward the formula of calculation length of compressed pile under the states that the part of pile depth in soil is haff-embedded.The formula of calculation length of compressed pile under the states that the part of pile depth in soil is halfembedded,which has only 8.1％ difference with the numerical analysis results,fitting the actual load conditions.关键词
虚拟嵌固点法/桩周土开挖/桩基稳定性/临界入土深度/数值分析Key words
illusion embedded solid point method/soil excavation around the pile/piles bucking stability/critical value of depth in solid/numerical analysis分类
建筑与水利引用本文复制引用
贾强,栾树,张鑫..基于虚拟嵌固点法的桩基稳定性数值分析[J].山东建筑大学学报,2017,32(1):12-20,9.基金项目
国家自然科学基金资助项目(51278286) （51278286）
教育部科研创新团队支持计划项目(IRT13075) （IRT13075）
山东省教育厅科技计划项目(J10LE06) （J10LE06）
