Chen Qingzhi, Liu Yuanming, Teng Zhaolei, Ou Xun, Zhang Quan
College of Civil Engineering, Guizhou University, Guiyang, 550025, Guizhou, China.
Sci Rep. 2024 Mar 11;14(1):5871. doi: 10.1038/s41598-024-56068-4.
The damage behavior of limestone rock masses containing calcite mineral filling under uniaxial compression experimental conditions is unclear, and the fracture mechanism of the rock masses needs to be further explored. In this study, uniaxial compression tests were conducted on limestone rock specimens containing veined calcite by combining acoustic emission and digital image correlation techniques. The effects of veined calcite on the generation and development of cracks on the surface of the specimens until the formation of macroscopic penetration and the strength properties of the rock mass were analyzed. The results showed that the transversely distributed veined calcite caused significant stress concentrations in the rock specimens. The longitudinally distributed veined calcite caused cracks in the specimens or influenced the expansion path of the longitudinal principal cracks. The final damage pattern of the specimens didn't differ significantly from that of conventional rock masses due to the presence of veined calcite. The presence of the veined calcite had effect on the uniaxial compressive capacity of the rock, but the load variation process of the specimen with time still conformed to the load variation pattern during the uniaxial compressive test of conventional rocks.
在单轴压缩试验条件下，含方解石矿物充填物的石灰岩岩体的损伤行为尚不明确，岩体的断裂机制有待进一步探究。在本研究中，通过结合声发射和数字图像相关技术，对含脉状方解石的石灰岩岩石试样进行了单轴压缩试验。分析了脉状方解石对试样表面裂纹产生与扩展直至宏观贯通形成的影响以及岩体的强度特性。结果表明，横向分布的脉状方解石在岩石试样中引起了显著的应力集中。纵向分布的脉状方解石导致试样出现裂纹或影响纵向主裂纹的扩展路径。由于脉状方解石的存在，试样的最终破坏模式与常规岩体的破坏模式没有显著差异。脉状方解石的存在对岩石的单轴抗压能力有影响，但试样的荷载随时间的变化过程仍符合常规岩石单轴压缩试验中的荷载变化规律。
