岩土力学2025，Vol.46Issue(5)：1409-1418,1428,11.DOI:10.16285/j.rsm.2024.0894
循环载荷下破碎煤体渗透率及迂曲度演化研究
Permeability and tortuosity evolution of crushed coal under cyclic loading
摘要
Abstract
Cyclic loading significantly affects coal seepage;however,the quantitative characterization of seepage channels in fractured coal under cyclic loading is inadequate,and a matrix structure model for the fractured coal is absent.Therefore,seepage tests involving pore pressure and confining pressure cyclic loading were conducted on fractured coal with different grading conditions.The results indicate:1)Under both pore pressure and confining pressure cyclic loading,the initial permeability of the coal mass varies with grading.As the Talbol power exponent increases,permeability successively increases,exhibiting clear stratification.2)The sensitivity of effective stress to permeability K under cyclic loading is represented by effective stress variation △σSe.It is observed that the value of △σSc decreases in an"L-shaped"manner as permeability K increases during pore pressure cyclic loading.When K≤0.75×10-12m2,the smaller Talbol power exponent corresponds to a lower the value of △σSe is.3)A method to calculate the average seepage pore area of graded coal is proposed,and a tortuosity model is developed to describe the evolution of tortuosity in fractured coal under cyclic loading.This research provides a theoretical basis for understanding the permeability evolution mechanism of fractured coal under cyclic loading and establishing a seepage model.关键词
渗透率/循环载荷/有效应力/敏感系数/迂曲度模型Key words
permeability/cyclic loading/effective stress/sensitivity coefficient/tortuosity model分类
矿山工程引用本文复制引用
张天军,田嘉伟,张磊,庞明坤,潘红宇,孟伟,贺绥男..循环载荷下破碎煤体渗透率及迂曲度演化研究[J].岩土力学,2025,46(5):1409-1418,1428,11.基金项目
国家自然科学基金项目(No.52374228) （No.52374228）
国家自然科学基金青年基金项目(No.52104216,No.52304253).This work was supported by the National Natural Science Foundation of China(52374228)and the National Natural Science Foundation for Young Scientists of China(52104216,52304253). （No.52104216,No.52304253）
