Variation Pattern of the Stress‐Strain Curve of Concrete under Multifactor Coupling

Abstract

The air shafts of coal mines contain solid, liquid, and gaseous substances that corrode concrete under conditions of relatively high temperature and humidity. The coupling of various factors decreases the concrete strength and thus the bearing capacity of the air shaft lining. In this study, concrete corrosion tests were carried out by simulating the complex environment of a coal mine air shaft lining to study the variation in the concrete stress-strain curve. For corroded concrete specimens subjected to very low stress, the microcracks and holes were closed, generating a large deformation, indicating severe concrete corrosion. The longer the corrosion time was, the gentler the initial slope of the curve. Finally, the uniaxial compression constitutive model of corroded concrete was established based on the Weibull distribution of three parameters, and the model curve was compared with the experimental curve. This model can not only predict the change of the stress-strain curve of high-strength concrete in a coal mine air shaft environment but also provide theoretical reference for the application of high-strength concrete in an air shaft environment.

Multi-angle property analysis and stress–strain curve prediction of cementitious sand gravel based on triaxial test

“…The results showed that as long as the strength of steel reaches 980 MPa, the error of the stress–strain curve predicted by the model was within 100 MPa in most cases. Xie et al 20 analyzed and predicted the variations of stress–strain curve of concrete under multi-factor coupling by using parametric equation method. However, the general steps such as the establishment of mathematical models or mathematical equations are complicated, and the most important thing is that the efficiency and accuracy need to be improved, so it is urgent to develop a low-cost, high-accuracy stress–strain curve prediction method.…”