基于德鲁克-普拉格准则的围岩损伤区渗透系数研究  

Permeability Coefficient of Damage Zone of Surrounding Rock Based on Drucker-Prager Criterion

作　　者：孙珍平[1] 高召宁[1] 孟祥瑞[1] 

机构地区：[1]安徽理工大学能源与安全学院,安徽淮南232001

出　　处：《长江科学院院报》2013年第3期26-29,39,共5页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金项目(51074003;51074005);高等学校博士学科点专项科研基金项目(新教师类)(20093415120001);安徽省优秀青年科技基金资助项目(10040606Y31)

摘　　要：利用损伤力学,考虑了中间主应力作用,应用德鲁克-普拉格准则,推导了圆形巷道围岩应力场的解析解,给出了围岩渗透系数的表达式,并对孔隙水压力和围岩塑性区域半径与渗透系数之间的关系进行了研究。研究表明:在损伤区域范围内,渗透系数K随着r的增加呈非线性减小,随着孔隙水压力p的增大呈指数增加。研究成果可为巷道在渗流作用下变形破坏计算及稳定性分析提供理论依据。This research is to provide theoretical basis for the deformation calculation and stability analysis of road- way under seepage action. The analytical solution of circular roadway＇ s surrounding rock stress field, and the expression of surrounding rock＇ s permeability coefficient were put forward in consideration of intermediate principal stress based on Drueker-Prager criterion and Damage Mechanics. Moreover, the relation K vs. pore water pressure p, and K vs. radius r of surrounding rock＇ s plastic zone were that within the damage exponentially with the of permeability coefficient obtained. Results showed area, permeability coefficient K decreased nonlinearly with the increase of r, while increased rise of pore water pressure p.

关 键 词：德鲁克-普拉格准则 损伤变量 中间主应力 渗透系数 孔隙水压力 

分 类 号：TD311[矿业工程—矿井建设]