文献类型：期刊文献

英文题名：Experimental investigation on the macro- and micromechanical properties of water-cooled granite at different high temperatures

作者：Wang, Tianzuo[1,2];Wang, Jisha[1];Zhang, Xin[2];Cheng, Peifeng[3];Xue, Fei[1];Xue, Mengya[1]

机构：[1]Shaoxing Univ, Sch Civil Engn, Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing 312000, Peoples R China;[2]Huahui Engn Design Grp Co LTD, Shaoxing 312000, Peoples R China;[3]Northeast Forestry Univ, Harbin 150040, Peoples R China

年份：2024

卷号：14

期号：1

外文期刊名：SCIENTIFIC REPORTS

收录：SCI-EXPANDED(收录号：WOS:001279108900035)、、Scopus(收录号：2-s2.0-85199798779)、WOS

基金：The authors would like to acknowledge the financial support provided by the Natural Science foundation of Zhejiang Province (Grant No. LGJ22D020001), the National Post-Doctor Regulatory Commission (No. 333795) and the National Natural Science foundation of China (Grant No. 52104094 & 42272333). And many thanks to Dr. Li Zheng for his help and guidance in data analysis.DAS:The data used to support the findings of this study are included within the article.

语种：英文

外文关键词：Granite; Water cooling; Different temperatures; Macro- and micromechanical properties; Nanoindentation

外文摘要：To investigate the damage mechanisms in granite's physical and mechanical properties after high-temperature water quenching, this study employed MTS815.04 for uniaxial compression tests on thermally treated specimens, with concurrent acoustic emission monitoring, and utilized nanoindentation for micromechanical analysis. The results show that with increasing temperature, granite's peak strength and elastic modulus decrease, with a sharp decline after 400-500 degrees C, corresponding to a significant increase in the internal damage, which can be detected by acoustic emission monitoring. Below 500 degrees C, macroscopic mechanical degradation is due to mineral thermophysical property differences, while above 500 degrees C, microcrack development is the main deterioration factor. The failure mode shifts from tensile to tensile-shear complex to shear failure, with transition points at 400 degrees C and 800 degrees C. The results of this study are of certain reference value for improving the efficiency of extracting thermal energy from dry-hot rocks and providing security guidance for the tunnel restoration process following fire damage.