山东煤炭科技2025，Vol.43Issue(1)：110-115,6.DOI:10.3969/j.issn.1005-2801.2025.01.023
动态卸荷作用下风化砂岩的蠕变特性研究
Study on Creep Characteristics of Weathered Sandstone Under Dynamic Unloading Action
张西恒 1翟庆龙 1彭广林1
作者信息
- 1. 山东能源新汶矿业集团华丰煤矿,山东 泰安 271413
- 折叠
摘要
Abstract
To reflect the stress state of weathered sandstone during underground engineering excavation process,this paper conducts constant axial pressure step-by-step unloading triaxial creep tests under different constant axial pressure actions.The rock creep characteristics under different axial forces and confining pressure actions are analyzed through axial instantaneous strain amount,creep strain amount,and axial strain rates at each level during the unloading process.An improved type viscoelastic plasticity non steady state creep model is constructed based on the Burgers body to simulate the entire creep process,and the test results are verified.The result indicates that the deformation amount of weathered sandstone increases with the decrease of confining pressure under the same axial load;Under the same confining pressure condition,the larger the axial load,the stronger the deformation of the test block,with a larger instantaneous strain and creep rate,and a smaller stage number of unloading experienced,leading to earlier occurrence of test block instability and failure;The improved model has a relatively strong correlation between the calculated results and experimental values of the entire unloading creep process.This result is of great significance for accurately understanding the creep characteristics of weathered sandstone under dynamic loading action.关键词
地下工程/风化砂岩/动态卸荷/Burgers体/非稳态蠕变模型Key words
underground engineering/weathered sandstone/dynamic unloading/Burgers body/non steady state creep model分类
矿山工程引用本文复制引用
张西恒,翟庆龙,彭广林..动态卸荷作用下风化砂岩的蠕变特性研究[J].山东煤炭科技,2025,43(1):110-115,6.
