岩土力学2025，Vol.46Issue(5)：1521-1533,13.DOI:10.16285/j.rsm.2024.0937
单轴压缩下水泥注浆煤岩力学性能及损伤特征研究
Mechanical properties and damage characteristics of cement grouted coal and rock under uniaxial compression
摘要
Abstract
Grouting is a widely used and effective method to enhance the strength of soft,fractured surrounding rock and maintain engineering stability.In order to evaluate the impacts of grouting on mechanical properties and fracture damage of coal and rock,uniaxial compression tests were conducted on samples before and after ultrafine cement grouting.Digital image correlation and acoustic emission technologies were employed to monitor damage evolution and crack growth in coal and rock.The process of crack tip grouting expansion was discussed using fracture mechanics theory.The results show that:1)Compared to intact coal samples,the strength increase post-grouting.Coal samples with more cracks exhibit lower strength,potentially due to stress concentration at crack tips.2)Post-grouting,internal pores in the coal sample are filled,reducing brittleness and enhancing plasticity and deformation resistance.However,grouting minimally affects post-peak deformation,and the cementation between grout and coal is suboptimal.3)The failure of intact coal samples primarily exhibits a single high-strain concentrated zone.In grouted coal samples,grouting enhances the isotropic of the mechanical properties failure lacks a in distinct strain concentrated zone,and strain evolution is relatively disordered.4)The horizontal displacement damage factor Dw is proposed to characterize the damage evolution degree of coal under uniaxial load,the horizontal displacement damage variable is defined,and the damage piecewise constitutive model for uniaxial compression coal sample is established.关键词
注浆加固/裂纹扩展/损伤因子/本构模型Key words
grouting reinforcement/crack propagation/damage factor/constitutive model分类
矿业与冶金引用本文复制引用
都海龙,金爱兵,秦文静,商瑞豪,王传江,马赛..单轴压缩下水泥注浆煤岩力学性能及损伤特征研究[J].岩土力学,2025,46(5):1521-1533,13.基金项目
国家自然科学基金(No.52174106).This work was supported by the National Natural Science Foundation of China(52174106). （No.52174106）
