岩石热损伤破裂的数值模拟研究  

Study on Numerical Simulation of Thermal Damage and Fracture of Rock

作　　者：赵璐敏 郤保平[1,2] 曹钰 常亮亮 尚思远 吴玮琛 ZHAO Lumin;XI Baoping;CAO Yu;CHANG Liangliang;SHANG Siyuan;WU Weichen(College of Mining Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China;Key Laboratory of In-situ Modified Mining Ministry of Education,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China)

机构地区：[1]太原理工大学矿业工程学院,山西太原030024 [2]太原理工大学原位改性采矿教育部重点实验室,山西太原030024

出　　处：《矿业研究与开发》2023年第5期131-136,共6页Mining Research and Development

基　　金：国家自然科学基金资助项目(51874207);山西省自然科学基金资助项目(201701D121131)。

摘　　要：基于颗粒流离散元程序PFC2D建立热力耦合数学模型,针对温度作用下花岗岩的破坏裂纹扩展演化规律展开模拟研究。数值模型计算结果表明:热冲击下数值模型的裂纹均从四周开始向内部延伸,并在边界处产生相对较密的裂纹;升温与降温均会对岩石造成一定的热损伤,升、降温过程中裂纹均率先出现在热膨胀系数较大的颗粒之间,400℃为该岩种的起裂温度;升降温过程分别产生的主要裂纹的力学属性不同;降温导致岩石宏观力学特性小幅增强后大幅劣化,力学性质衰减42%。计算结果与试验现象保持较好的一致性。Based on the particle flow discrete element program PFC2D,a thermal-mechanical coupling mathematical model was established.The propagation and evolution law of failure cracks of granite under temperature was simulated.The calculation results of the numerical model show that the cracks of the numerical model under thermal shock begin to extend from the periphery to the inside,and relatively dense cracks are generated at the boundary.Heating and cooling will cause certain thermal damage to the rock.In the process of heating and cooling,the cracks first appear between particles with large thermal expansion coefficient,and 400℃ is the crack initiation temperature of the rock.The mechanical properties of the main cracks produced in the process of heating and cooling are different.Cooling leads to a slight increase in the macroscopic mechanical properties of the rock,and then greatly deterioration,the mechanical properties decrease by 42%.The calculation results are in good agreement with the experimental phenomena.

关 键 词：花岗岩 离散元 热力耦合模型 裂纹演变规律 

分 类 号：TD315[矿业工程—矿井建设]