单轴压缩下基于轴向塑性应变的岩石裂纹闭合应力与损伤应力阈值的评估方法
Estimating crack closure and damage stress thresholds of rock during uniaxial compression based on axial plastic strain
周子龙 1王培宇 1蔡鑫 2赵奕翰 3刘建民 4焉兆熙 1陈龙峰1
作者信息
- 1. School of Resources and Safety Engineering,Central South University,Changsha 410083,China
- 2. School of Resources and Safety Engineering,Central South University,Changsha 410083,China;State Key Laboratory of Safety Technology of Metal Mines,Changsha 410012,China
- 3. Power China Zhongnan Engineering Corporation Limited,Changsha 410014,China
- 4. CCFED Civil Engineering Corporation Limited,Changsha 410004,China
- 折叠
摘要
量化裂纹应力阈值对认识岩石材料的变形与破坏具有重要意义.本文首先提出了一种基于轴向塑性应变评估岩石裂纹闭合应力和损伤应力阈值的新模型.随后,通过比较提出方法与已有方法的估计结果,验证了本文提出方法的准确性.最后,讨论了弹性模量取值误差对应力阈值计算结果的影响.结果表明,提出方法计算结果与已有方法计算结果非常接近,说明提出方法可以准确识别岩石材料的裂纹闭合应力和损伤应力阈值.此外,本文提出方法能显著降低弹性参数取值对岩石应力阈值计算结果的影响,能够更客观地确定岩石材料的裂纹闭合应力和损伤应力阈值.基于以上结果,本文还提供了详细的计算流程图以消除弹性模量误差造成的影响.
Abstract
The quantitative determination of crack stress thresholds is of great significance to comprehend the deformation and failure of rock.In the study,we proposed a new model to estimate the crack closure and crack damage stress thresholds based on axial plastic strain.Then we compared the stress thresholds calculated by the proposed method with that by existing methods to validate the accuracy of our method.Finally,we discussed the effect of the error of elastic modulus on estimated stress thresholds.The results show that the crack closure and crack damage stresses predicted by the proposed method are very close to that by other methods.This indicates the proposed method can accurately identify the crack closure and crack damage stresses of rock materials.Moreover,the proposed method greatly reduces the dependence on elastic parameter and obtains the stress thresholds of crack closure and crack damage objectively.Based on the results,we developed a detailed flow chart for the proposed method to minimize the effect of elastic modulus.
关键词
裂纹闭合应力/裂纹损伤应力/轴向塑性应变/岩石变形/单轴压缩Key words
crack closure stress/crack damage stress/axial plastic strain/rock deformation/uniaxial compression引用本文复制引用
基金项目
国家重点研发计划(2022YFC2903901)
国家自然科学基金(52104111)
国家自然科学基金(52274249)
湖南省自然科学基金(2021JJ30819)
Open Fund of State Key Laboratory of Safety Technology of Metal Mines,China(kfkt2023-01)
Xiaohe Sci-Tech Talents Special Funding under Hunan Provincial Sci-Tech Talents Sponsorship Program,China(2023TJ-X80)
中央高校基本科研业务费专项(2023ZZTS0516)
出版年
2023
NETL
NSTL
万方数据