Experimental study on the sliding instability mechanism of slopes with weak layers under creeping action. (15th May 2023)

• Record Type: Journal Article
• Authors: Bao, Min; Chen, Zhonghui; Zhang, Lingfei; Nian, Gengqian; Zhu, Tianyu; Hao, Jianshuai
• Is Part Of: Measurement. Volume 212(2023)
• Publication Date: 2023-05-15
• Subjects: Weak interlayer -- Locked segment -- Creep-slip segment -- Base friction tests -- Stepped failure; Weights and measures -- Periodicals; Measurement -- Periodicals; Measurement; Weights and measures; Periodicals; 530.8
• DOI: 10.1016/j.measurement.2023.112690
• Languages: English
• ISSNs: 0263-2241

Abstract

Highlights: 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. Abstract: 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.