采矿与岩层控制工程学报2025，Vol.7Issue(3)：78-88,11.DOI:10.13532/j.jmsce.cn10-1638/td.2024-1186
应力-渗流耦合下含裂隙砂岩力学特性研究
Study on mechanical properties of fractured sandstone under stress-seepage coupling conditions
摘要
Abstract
With the increase of mining depth of resources,the influence of high stress,high pore pressure and engineering disturbance on the mechanical behavior of rocks is more pronounced.This is particularly true in fractured rock formed under complex conditions,affecting the engineering safety.Focusing on fracture-developed aquifer sandstone commonly encountered in deep resource extraction,laboratory tests were conducted to simulate the stress process of fracture formation.Fractured sandstone specimens replicating the in-situ fracture-forming stress environment were prepared.Stress-seepage coupling tests were then performed on these specimens to investigate their deformation,strength,and permeability characteristics.The results show that both the deformation and strength of the fractured sandstone exhibit significant confining pressure strengthening effects and water pressure weakening effects.Under the low seepage pressure,the shear strength of fractured sandstone is determined by cohesion c and internal friction coefficient f,while with the increase of the seepage pressure,the shear strength is mainly determined by the internal friction coefficient f only.The permeability decreases with the increase of the confining pressure and increases exponentially with the increase of the seepage pressure.Considering the influence of confining pressure and seepage pressure,a prediction model of elastic modulus of the fractured sandstone is proposed under the conditions of σ3≤16 MPa and Pw≤15 MPa.关键词
应力-渗流耦合/渗透率/力学特征/含裂隙砂岩Key words
stress-seepage coupling/permeability/mechanical characteristics/fractured sandstone分类
矿山工程引用本文复制引用
曾波,冯江荣,秦垦,徐尔斯,王璐,李瑞根,刘建锋..应力-渗流耦合下含裂隙砂岩力学特性研究[J].采矿与岩层控制工程学报,2025,7(3):78-88,11.基金项目
国家自然科学基金资助项目(12102366) （12102366）
四川省科技计划资助项目(2023ZYD0154) （2023ZYD0154）
四川省科技厅重点研发计划(国际科技创新合作/港澳台科技创新合作)资助项目(2023YFH0005) （国际科技创新合作/港澳台科技创新合作）
