The analysis of rheological damage of anchorage body based on visco-elasto-plastic model

Qing-Duo Wang,Xue-Rui Yang,Aleksei Renev,Feng-Hai Yu,Sergei Tsibaev,Q Yao,L Chen,W Qiao,S Chen,S Gao

doi:10.1051/e3sconf/202130301060

Abstract

In order to study the rheological damage of anchorage body, rheological damage model of anchorage body is established in this paper, and it is based on visco-elasto plastic model that is often used to simulate rock rheological characteristics. The expressions of creep constitutive equation and elastic modulus of anchorage body are obtained through the analysis of rheological damage model of anchorage body, and by the fitting calculation results, finding that the theoretical creep curve is matched with the experimental creep curve under certain conditions. The research conclusions have critical significance to the bolting support and design.

Highlights

The coal-measure strata formed an obvious layered distribution during the deposition and construction process
It is valuable for the analysis of separation instability to study the rheological damage of the original rock and the anchored rock mass, and it has certain guiding significance for on-site roadway bolt support
The failure process of the rock is caused by the continuous accumulation and expansion of damage, which can be reflected by the change of elastic modulus

Summary

Introduction

The coal-measure strata formed an obvious layered distribution during the deposition and construction process. After the roadway is excavated, the stress of the surrounding rock of the roadway will be redistributed. In this process, firstly, the separation layer will be gradually generated from these weak surfaces from bottom to top. If effective support measures are not taken in time, it is easy to cause the roof separation instability, which will cause severe consequences. It is valuable for the analysis of separation instability to study the rheological damage of the original rock and the anchored rock mass, and it has certain guiding significance for on-site roadway bolt support. To simulate the rheological characteristics of rocks, and conducts analysis and experimental verification on it

The analysis of Rock initial damage

Rheological damage model of anchored body

Test verification

Conclusion