Experimental study on the sliding instability mechanism of slopes with weak layers under creeping action

• Published in: Measurement : journal of the International Measurement Confederation Vol. 212; p. 112690
• Main Authors: Bao, Min, Chen, Zhonghui, Zhang, Lingfei, Nian, Gengqian, Zhu, Tianyu, Hao, Jianshuai
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.05.2023
• Subjects: Base friction tests; Creep-slip segment; Locked segment; Stepped failure; Weak interlayer; Creep-slip segment; Stepped failure; Locked segment; Base friction tests; Weak interlayer
• ISSN: 0263-2241; 1873-412X
• DOI: 10.1016/j.measurement.2023.112690

•Summarized the destabilization damage patterns of slopes containing weak interlayer.•Image -based measurement techniques (DIC and PIV) are used to analyze the deformation instability and velocity vector fields of slopes.•Reveals the role of locking and creep-slip sections in the stability analysis of slopes with weak interlayer. The bedding rock slope is widely distributed, and its stability is mainly controlled by the weak interlayer. In our study, the weak interlayer was divided into two parts: the locked segment and the creep-slip segment. Besides, base friction tests were conducted on slopes with different weak interlayers to reveal the instability deformation mechanism of slopes containing weak interlayers. A comparative analysis of the damage pattern and displacement field evolution of slopes containing weak interlayers at different periods was performed using a noncontact scattering technique and measured point tracking. Following the blocking effect of the locking segment, the slope instability deformation was classified into five stages: decay creep, stable creep, accelerated creep, shoulder overturning, and failure. The slope with locking segments forms a steep hill at the top of the slope, and the slope exhibits a stepped failure near the surface as the length of the locking segment increases.