岩土力学2026，Vol.47Issue(1)：296-313,18.DOI:10.16285/j.rsm.2025.0090
非均质含角砾砂岩单轴抗压强度最小样本数研究
Minimum number of samples required for uniaxial compressive strength of heterogeneous sandstone with breccia clasts
摘要
Abstract
The heterogeneity in breccia content and geometry significantly influences the variability of the mechanical properties of sandstone containing breccia clasts.However,previous studies have often neglected the distribution of breccia geometry,resulting in inaccurate assessments of mechanical behavior.To investigate mechanical properties and determine the minimum number of samples for testing,particle-shape indices were introduced to quantify breccia geometry and its statistical distribution.Using laboratory experiments and numerical simulations,we developed a model that incorporates breccia content and the distribution of breccia geometry.The study explored the effects of breccia area,slenderness,and roughness on the mechanical properties of sandstone containing breccia clasts,along with their impact on the minimum sample number.The findings reveal a strong positive correlation between breccia content and fine length with the uniaxial compressive strength of sandstone containing breccia clasts,with Pearson correlation coefficients of 0.87 and 0.62,respectively.In contrast,breccia roughness exhibited a weaker correlation,with a Pearson coefficient of 0.31.Increasing the variability of the fine length of the breccia significantly elevated the minimum sample number,while variability in breccia roughness had no significant effect.Although the area of individual breccia particles did not alter the minimum required sample number,it contributed to an increase in the uniaxial compressive strength of the sandstone with breccia clasts.This study reveals the underlying causes of the variability in the mechanical properties of sandstone containing breccia clasts and establishes a dynamic approach to determine the minimum sample number,which was found to be 14.The proposed method achieved a relative error of less than 2%in predicting the uniaxial compressive strength.These findings provide valuable insights into evaluating mechanical properties and determining its minimum required sample number.关键词
非均一性/单轴抗压强度/最小样本数/含角砾砂岩Key words
heterogeneity/uniaxial compressive strength/minimum number of samples/sandstone with breccia clasts分类
建筑与水利引用本文复制引用
王昌硕,童烁超,雍睿,严佳佳,罗战友,安鹏举,许汉华..非均质含角砾砂岩单轴抗压强度最小样本数研究[J].岩土力学,2026,47(1):296-313,18.基金项目
国家自然科学基金资助项目(No.42207175,No.42577170,No.42177117,No.42277147) （No.42207175,No.42577170,No.42177117,No.42277147）
宁波市科技计划项目青年科技创新领军人才项目(2024QL051) （2024QL051）
中央引导地方科技发展资金项目(2025ZY01028). This work was supported by the National Natural Science Foundation of China(42207175,42577170,42177117,42277147),Ningbo Youth Leading Talent Project(2024QL051)and the Central Government Funding Program for Guiding Local Science and Technology Development(2025ZY01028). （2025ZY01028）
