物探化探计算技术2026，Vol.48Issue(1)：126-135,10.DOI:10.12474/wthtjs.20250116-0004
微观裂隙变形及其对宏观波速压力依赖性的影响研究
Microscopic fracture deformation and its influence on stress-dependence of wave velocity
摘要
Abstract
During the crack closure process,traditional theories often assume an unchanged major axis,but a narrowing minor axis.However,due to stress interactions,a uniformly distributed stress leads to simultaneous narrowing of the major and minor axes during fracture closure.To systematically study this deformation process,an elliptical cracked model is first constructed,and the numerical model's accuracy is verified using the closing law.Based on this,a series of random medium models are built,and the practical medium theory is introduced to explore the influence of fracture deformation on the effective wave velocity.The results show that the cracked closure will significantly affect P-wave velocity but have almost a negligible effect on S-wave velocity.For the models with various groups of cracks,the stress-dependency of the P-and S-waves failed to exhibit the staged characteristics,and the pressure dependence of the wave velocity results in the values of the model closure pressure and the slope of the linear segment of the velocity.This study can lay a theoretical foundation for future inversion of fracture distribution and geometric statistical parameters from model pressure-dependence data.关键词
裂隙长短轴/数值模拟/波速Key words
the major and minor axis/numerical simulation/velocity分类
天文与地球科学引用本文复制引用
LIU Hao,LI Bo,DUAN Shenglong..微观裂隙变形及其对宏观波速压力依赖性的影响研究[J].物探化探计算技术,2026,48(1):126-135,10.基金项目
上海建科集团科研创新项目(KY10000038.20230018) （KY10000038.20230018）
北京市自然科学基金青年项目(8244059) （8244059）
中国博士后科学基金(2022M713473) （2022M713473）
流域水循环模拟与调控国家重点实验室开放研究基金(IWHR-SKL-KF202218) （IWHR-SKL-KF202218）
