含软弱夹层的强风化泥岩强度及破坏模式试验研究

Fu, Xudong, Lu, Jizhong, Huang, Bin and Zhang, Yuting (2021) 含软弱夹层的强风化泥岩强度及破坏模式试验研究. Dongnan Daxue Xuebao (Ziran Kexue Ban), 51 (2), 242-248. (doi:10.3969/j.issn.1001-0505.2021.02.008).

Abstract

In order to investigate the effects of weak interlayer on slope instability, theoretical and experimental studies on the strength and the failure mode of rock containing weak interlayer were conducted. Three types of triaxial specimens of strongly weathered mudstone, muddied interlayer, and mudstone with the weak interlayer were prepared by using the core specimens of a slope borehole, and the triaxial consolidation undrained shear tests were conducted, respectively. Combined with the theoretical analysis, the strengths and failure modes of the strongly weathered mudstone, the muddied interlayer and the mudstone with weak interlayer were studied, and the influence laws of the interlayer angle and the confining pressure on the strengths and failure modes of specimens were revealed. The results show that the stress-strain curves of the strongly weathered mudstone and the muddied interlayer are strain-softening type and strain-hardening type, respectively. There exists a critical inclination angle range for specimens containing the weak interlayer. When the interlayer angle is within the range, the failure surface occurs in the weak interlayer. When the interlayer angle is outside the range, specimens undergo global shear damage. When the confining pressure exceeds 0.4 MPa, the confining pressure has no effect on the failure mode of specimens containing the weak interlayer.

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Contributors

Author: Yuting Zhang

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