三峡大学学报（自然科学版）2025，Vol.47Issue(3)：14-19,6.DOI:10.13393/j.cnki.issn.1672-948X.2025.03.003
地下洞室脆性岩石断裂韧度巴西圆盘力学试验研究
Research on Fracture Toughness of Brittle Rock in Underground Caverns Using Brazilian Disc Mechanical Tests
摘要
Abstract
The Cracked Chevron Notched Brazilian Disc(CCNBD)method was employed to conduct split tests on granite sampled from a large hydropower station underground cavern,to investigate the fracture mechanics behavior,fracture mechanisms,and crack propagation characteristics under different moisture contents.The results indicate that the peak load of saturated granite decreased by 15.4%compared to the average peak load in dry conditions,and the average peak displacement reduced by 17.7%.In saturated conditions,the fracture toughness of granite specimens decreased by 15.3%compared to dry conditions.After crack initiation,cracks rapidly propagate in the ligament zone,exhibiting a predominantly tensile stress-driven mode I crack propagation.The presence of water significantly deteriorates the fracture toughness of rock specimens and reduces their capacity to absorb strain energy,making the surrounding rocks more susceptible to fracture failure in moist conditions.These findings provide a theoretical foundation for analyzing the mechanical behavior in hydropower underground cavern engineering and offer technical support for the stability analysis of large underground caverns.关键词
地下洞室/脆性岩石/花岗岩/V形切槽巴西圆盘/断裂韧度/断裂机制Key words
underground caverns/brittle rock/granite/cracked chevron notched Brazilian disc(CCNBD)/fracture toughness/fracture mechanism分类
水利科学引用本文复制引用
王耘梓,孙宁,王龙,刘渊泽,余政兴,徐卫亚..地下洞室脆性岩石断裂韧度巴西圆盘力学试验研究[J].三峡大学学报（自然科学版）,2025,47(3):14-19,6.基金项目
国家自然科学基金重点项目(51939004) （51939004）
中国华能集团有限公司科技项目(HNKJ22-109) （HNKJ22-109）
