基于围岩劣化诱导的洞室群稳定数值模拟  

Numerical Simulation of Underground Caverns Stability Based on Surrounding Rock Degradation Induction

作　　者：祝方才[1] 刘青 刘思远 过江[2] ZHU Fangcai;LIU Qing;LIU Siyuan;GUO Jiang(College of Civil Engineering,Hunan University of Technology,Zhuzhou 412007,China;School of Resources and Safety Engineering,Central South University,Changsha 410083,China)

机构地区：[1]湖南工业大学土木工程学院,湖南株洲412007 [2]中南大学资源与安全工程学院,湖南长沙410083

出　　处：《金属矿山》2021年第12期207-215,共9页Metal Mine

基　　金：湖南省自然科学基金株洲联合项目(编号:2018JJ4007);国家自然科学基金项目(编号:52174140)。

摘　　要：洞室施工过程的诱导扰动包括应力释放和转移、围岩劣化等,导致洞室群出现加速失稳。利用RFPA软件分别建立了水平排列三圆孔和倾斜排列三圆孔数值模型,前者通过邻近圆孔的材质替换模拟围岩劣化诱导研究圆孔破坏过程,后者研究最大剪应力方向圆孔破坏特征。水平排列条件下,分别利用临近空孔填充石蜡和石膏等不同扰动诱导程度研究表征稳定性的特征参数,包括拱顶沉降、声发射和应力分布。结果表明,斜孔布置在45°方向较易破坏且破坏程度从上圆孔开始,拱顶沉降也最大。通过填充石膏和石蜡模拟围岩劣化诱导程度,石膏强度高于石蜡,即围岩劣化诱导石蜡高于石膏,诱导程度高,拱顶沉降较大,声发射能量低,围岩劣化越严重,洞室群易破坏,失稳越快。Disturbances such as stress release and deterioration of surrounding rock will accelerate the stability of underground caverns during construction.RFPA software was used to establish numerical models of three circular holes arranged horizontally and three circular holes arranged slanting respectively.The former studied the failure process of the circular holes by simulating the deterioration of surrounding rock by material substitution of adjacent circular holes,and the latter studied the failure characteristics of the circular holes in the direction of maximum shear stress.Under the condition of horizontal arrangement,the characteristic parameters of stability,including vault settlement,acoustic emission and stress distribution,were studied by filling adjacent empty holes with paraffin and plsater with different disturbance induction degrees.The results show that the oblique-hole arrangement in 45°direction is easier to be damaged,and the damage degree starts from the upper round hole,and the vault settlement is the largest.By filling plsater and paraffin wax to simulate the deterioration induced degree of surrounding rock,plsater strength is higher than paraffin wax,that is,the deterioration induced paraffin in surrounding rock is higher than plaster,the induced degree is high,the vault settlement is large,the acoustic emission energy is low,and the caverns is easy to be destroyed.

关 键 词：地下洞室 稳定性分析 声发射 拱顶沉降 RFPA3D 

分 类 号：TD354[矿业工程—矿井建设]