井壁径向极限承载及应力应变模型试验研究

Experimental Study of Shaft Wall Radial Limit Loadand Stress-Strain Model

为探究砼井壁径向极限承载及其应力应变关系,基于统一强度理论的井壁径向承载极限解公式,求解得到井壁径向极限承载,考虑混凝土多轴强度特性,对塑性极限解公式进行修正,给出高强砼井壁径向塑性极限承载力的修正公式,提出了砼井壁径向应力应变关系的数学模型.通过试验,理论预测值与试验的最大误差为2.85%,研究成果对井壁破坏的预测有一定指导作用.

In order to explore the radial ultimate bearing capacity of concrete shaft wall and its stress-strain relationship,the solution formula of shaft wall radial ultimate bearing capacity is obtained based on the unified strength theory.Considering the multi-axial strength characteristics of concrete,the plastic limit solution formula is modified,and the revised formula of radial plastic ultimate bearing capacity of high-strength concrete shaft wall is given.The mathematical model of radial stress-strain relation of concrete shaft wall is presented.Through the test,the maximum error between the theoretical predicted value and the test is 2.85%,and the research results have a certain guiding role in the prediction of shaft wall failure.