考虑地层蠕变的基坑水平支撑稳定性探究  

STUDY OF STABILITY OF HORIZONTAL BRACING OF PIT BASED ON CREEP STRATUM

作　　者：蒲瑜[1,2] 

机构地区：[1]重庆建筑工程职业学院,重庆400072 [2]重庆大学建筑学院,重庆400044

出　　处：《建筑技术》2017年第3期278-281,共4页Architecture Technology

基　　金：国家自然科学基金项目(71073033)

摘　　要：西原正夫模型可描述土体的蠕变特性,通过推导西原正夫卸载时的蠕变及流变本构方程,利用C++语言将蠕变本构模型程序化,基于该模型采用数值模拟的方法分析了基坑开挖完成后立柱桩在不同基坑宽度下的隆起规律,发现基坑越窄立柱桩隆起速率及隆起量越低,并研究了立柱桩隆起量与水平支撑安全轴力间的关系,得到长度越短的支撑所提供的支撑轴力越大,但对应允许的立柱桩隆起位移却较小,根据水平支撑极限弯矩求得立柱桩竖向位移表达式。Nishihara model can describe the creep properties of soil, by deducing the west of the original are the unloading creep and creep constitutive equation and creep constitutive model is programmed by C＋＋ language, adopt the method of numerical simulation analysis of the foundation pit excavation is completed pillar uplift law of pile under different excavation width, found that the narrower the pillar pile foundation pit uplift rate and lower uplift quantity, and studies the pillar pile uplift and lateral supporting security, the relationship between the axial force of find the shorter the length of the support provided by the strut axial forces, the greater the but corresponding allowed pillar uplift pile displacement is smaller, supported by level pillar pile vertical displacement expression of ultimate bending moment occurs.

关 键 词：地层蠕变 西原正夫模型 立柱桩回弹 水平支撑轴力 数值模拟 

分 类 号：TU921[建筑科学—建筑设计及理论]