Danqing Song

Jun 26, 2024 | mdpi.com | Weisong Chen |Zhuo Chen |Danqing Song |Hongjin He

All articles published by MDPI are made immediately available worldwide under an open access license. No special permission is required to reuse all or part of the article published by MDPI, including figures and tables. For articles published under an open access Creative Common CC BY license, any part of the article may be reused without permission provided that the original article is clearly cited. For more information, please refer to https://www.mdpi.com/openaccess.

Jun 29, 2023 | frontiersin.org | Yong Wang |Yanlin Zhao |Danqing Song

1 IntroductionRock mass basic quality (BQ) and Protodyakonov coefficient (f) are the rock classification methods in China and Russia respectively. Due to the different methods of rock classification, serious communication problems arose during the tunnel project, which was designed according to Russian norms and built according to Chinese standards.

Jun 29, 2023 | frontiersin.org | Geotechnical Engineering |Kai Liu |Danqing Song

IntroductionMany geological hazards have been induced in geological materials, which are extremely inhomogeneous and composed of rock blocks with high strength, fine soils, and pores, called “soil-rock mixture” (S-RM) by scholars (Gao et al., 2018; Senthilkumar et al., 2018; Fu et al., 2020; Gao et al., 2021). Due to its very nature, S-RM usually exhibits very complex physical and mechanical behaviors (Xu et al., 2015; Zhang et al., 2015; Zhang Z. L. et al., 2016; Zhao and Liu, 2019).