首页|降雨入渗与采动卸荷耦合下裂隙岩体力学特性及裂隙演化规律研究

降雨入渗与采动卸荷耦合下裂隙岩体力学特性及裂隙演化规律研究

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降雨影响下,雨水渗入岩体内部会导致其含水率和孔隙水压增大,使得岩体原有节理面快速演化、扩展和贯通.此外受矿山采动卸荷耦合作用,岩体极易诱发严重边坡灾害.以江西德兴铜矿为背景,运用PFC离散元方法对不同含水状态、孔隙水压力下的含裂隙岩样进行数值模拟,结果表明:①随着含水率的增加,岩石抗压强度逐渐降低,饱和岩石降幅为56.33%,横向扩容变形显著,增幅为69.06%,岩石张裂特性明显,破坏模式由拉伸破坏转为剪切破坏.②随着孔隙水压力的增大,岩石抗压强度降低,含2 MPa孔隙水压力降幅为21.74%,岩石颗粒之间黏结力减弱并形成局部应力集中现象,主要表现为岩石原有裂隙的扩展和贯通.研究结果可为边坡开采与围岩支护提供必要的理论支撑,确保矿山边坡安全与稳定.
Study on the mechanical properties and fracture evolution laws of fractured rock under coupled effects of rainfall infiltration and mining-unloading
Due to the impact of rainfall,infiltration of rainwater into rock masses leads to an increase in their moisture content and pore water pressure,resulting in rapid evolution,expansion,and connectivity of existing joint surfaces within the rock mass.Additionally,coupled with mining-induced unloading,this phenomenon significantly triggers slope disasters.Taking the Dexing Copper Mine in Jiangxi province as a background,numerical simulations of fractured rock samples under different moisture conditions and pore water pressures were conducted using the Particle Flow Code(PFC).The results indicate that:①With increasing moisture content,the compressive strength of the rock gradually decreases,with a reduction of 56.33%observed in saturated rock.Significant lateral expansion deformation was noted,with an increase of 69.06%.The rock exhibited pronounced tensile cracking characteristics,and the failure mode transitioned from tensile to shear failure.② As pore water pressure increased,the compressive strength of the rock decreased,with a reduction of 21.74%at 2 MPa pore water pressure.The cohesive forces between rock particles weakened,leading to localized stress concentration,primarily manifested by the expansion and connectivity of pre-existing fractures in the rock.The research results can provide essential theoretical support for slope mining and surrounding rock reinforcement,ensuring the safety and stability of mine slopes.

fractured rock massrainfall infiltrationmining unloadingnumerical simulationDexing copper minefracture evolution

刘志芳、杨舜、王志、唐德馨

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重庆轻工职业学院智能制造学院,重庆 401329

江西理工大学应急管理与安全工程学院,江西 赣州 341000

重庆大学资源与安全学院,重庆 400044

裂隙岩体 降雨入渗 采动卸荷 数值模拟 德兴铜矿 裂隙演化

重庆轻工职业学院校级科研资助项目重庆市教育委员会科学技术研究青年基金资助项目重庆市教育委员会科学技术研究青年基金资助项目

QGZRYB202409KJQN202206403KJQN202306404

2024

10.13264/j.cnki.ysjskx.2024.04.014

有色金属科学与工程
江西理工大学 江西省有色金属学会

有色金属科学与工程

CSTPCD北大核心
影响因子：0.751
ISSN：1674-9669
年,卷(期)：2024.15(4)