湿陷性黄土地基不均匀沉降:砌体结构基础变形规律

Uneven Settlement of Collapsible Loess Foundation:Deformation Law of Masonry Structure Basics

由于湿陷性黄土地基抗剪抗弯能力弱、浸水易发生湿陷变形。地基不均匀湿陷沉降变形极易引发地基、基础局部产生脱空现象,针对湿陷性黄土地区砌体结构建筑物地基基础局部产生脱空变形进行了研究,假定湿陷性黄土地基表面及地层表面不均匀沉降曲线符合Peck公式,将上部砌体结构简化为置于湿陷性黄土地基上的剪切梁,建立了上部砌体结构与湿陷性黄土地基协调工作模型,给出了协调工作微分方程;利用力的平衡原理、Fourier级数对弹性地基梁与上部砌体结构协调工作微分方程进行求解,通过自编程序计算,结果发现变量k取10和100时的值基本相同,湿陷性黄土地基表面及地层表面不均匀沉降曲线基本符合Peck公式,计算结果与实际情况基本相符,为湿陷性黄土地区砌体结构建筑检测、加固、维修提供理论依据。

Because of the weak shear and bending resistance of collapsible loess foundation,deformation often occurs when such a loess foundation soaked in water.Uneven settlement and deformation of the foundation could easily lead to the local void of the foundation.Therefore,the local void deformation of the foundation of masonry structure in collapsible loess area was studied.It was assumed that the uneven settlement curve of collapsible loess foundation surface and stratum surface conforms to the Peck formula.The deflection of beam on elastic foundation was deduced by static equilibrium and the Fourier series,and calculated by programming.The results show that when the variable k was taken as 10 and 100,the values were largely the same,and the uneven settlement curve of collapsible loess foundation surface and stratum surface conforms in overall to the Peck formula,the calculation results are mostly in accordance with the actual situation.This study provided a theoretical basis for the detection,reinforcement,and maintenance of masonry structure in collapsible loess area.