论文题目： Residual state rate effects of shear-zone soil regulating slow-to-fast transition of catastrophic landslides

作者：Xuan Kang（康璇）Shun Wang（王顺）Wei Wu（吴伟）Guangli Xu（徐光黎）

杂志：Engineering Geology

第一单位：State Key Laboratory of Water Resources and Hydropower Engineering Science, Institute of Engineering Risk and Disaster Prevention, Wuhan University, 299 Bayi Road, Wuhan, 430072, China.

DOI: 10.1016/j.enggeo.2022.106692

APA引用格式：Residual state rate effects of shear-zone soil regulating slow-to-fast transition of catastrophic landslides. Engineering Geology 304(1):106692. https://doi.org/10.1016/j.enggeo.2022.106692

摘要：

Catastrophic landslides with basal shear zones usually involve a number of mechanisms that are poorly understood. One mechanism issue is the transition from slow sliding to fast movement, leading to catastrophic failure. We perform laboratory experiments on landslide shear-zone materials to investigate how rate effects influence the slow-to-fast transition. Two types of ring-shear tests are carried out, namely residual state shear tests involving a wide range of shear rates and residual state creep tests with the applied shear stress close to the residual strength. Our tests show that the shear-zone material exhibits rate-weakening behaviour at low shear rates and rate-strengthening behaviour at high shear rates. These two opposite mechanisms are distinguished by a transition rate, which also regulates whether the creep motion falls into the viscous flow regime or returns to the slow sliding regime.