闫长斌,张彦昌,陈艳国,等. 考虑爆破累积损伤效应的含泥化夹层边坡滑移分析[J]. 水利水运工程学报,2021(1):104-113. doi: 10.12170/20200127001
引用本文: 闫长斌,张彦昌,陈艳国,等. 考虑爆破累积损伤效应的含泥化夹层边坡滑移分析[J]. 水利水运工程学报,2021(1):104-113. doi: 10.12170/20200127001
(YAN Changbin, ZHANG Yanchang, CHEN Yanguo, et al. Analysis on sliding displacement of slope with muddy intercalation considering blasting cumulative damage effect[J]. Hydro-Science and Engineering, 2021(1): 104-113. (in Chinese)). doi: 10.12170/20200127001
Citation: (YAN Changbin, ZHANG Yanchang, CHEN Yanguo, et al. Analysis on sliding displacement of slope with muddy intercalation considering blasting cumulative damage effect[J]. Hydro-Science and Engineering, 2021(1): 104-113. (in Chinese)). doi: 10.12170/20200127001

考虑爆破累积损伤效应的含泥化夹层边坡滑移分析

Analysis on sliding displacement of slope with muddy intercalation considering blasting cumulative damage effect

  • 摘要: 反复爆破振动是诱发滑坡的重要因素,特别是含泥化夹层的复杂岩质边坡。为揭示多次爆破振动下含泥化夹层复杂岩质边坡失稳破坏机制,根据能量守恒定律,基于Newmark滑块位移法,考虑爆破累积损伤效应,引入泥化夹层强度折减系数,建立了多次爆破振动下含泥化夹层边坡累积滑移量计算和临界爆破振动次数预测方法。探讨了剪切模量、倾角和连续率等泥化夹层参数对多次爆破振动下边坡累积滑移量的影响,并对泥化夹层参数敏感性进行了分析。研究结果表明:(1)考虑爆破累积损伤效应引起的泥化夹层强度参数劣化,边坡累积滑移量计算和临界爆破振动次数预测结果更加合理。(2)泥化夹层参数对多次爆破振动下边坡累积滑移量具有显著影响。随泥化夹层剪切模量的增大,边坡抵抗变形能力增大,累积滑移量减小。随泥化夹层倾角的增大,边坡剪切段滑移量无明显变化,但蠕滑段滑移量明显增大,总的累积滑移量随之增大。泥化夹层连续率越高,边坡累积滑移量越大。(3)参数敏感性分析表明,泥化夹层剪切模量对多次爆破振动下边坡累积滑移量影响最显著,其次是泥化夹层倾角,再次是泥化夹层连续率。

     

    Abstract: Repeated blasting vibrations are one of important triggers of landslides, especially those developed on complex rock slopes with muddy intercalation. To reveal the failure mechanism of complex rock slope with muddy intercalation under repeated blasting vibrations, a novel method was proposed to evaluate cumulative sliding displacement and critical blasting times for this type of slopes based on the law of conservation of energy and Newmark sliding block method. In this method, the cumulative damage effects of repeated blast vibrations were characterized through multiple strength reduction factors of muddy intercalation parameters, e.g. shear modulus, dip angle and continuity. The importance of those parameters on slope cumulative sliding displacement was also addressed using sensitivity analysis. The proposed method generally shows more reasonable results regarding estimation of cumulative sliding displacement and critical blasting vibration times. The parameters of muddy intercalation show significant controls on the cumulative sliding displacement of slope under many times of blasting vibration. With the shear modulus increased, the cumulative displacement declines as the slope resistance gets enhanced. Steeper dip angle of muddy intercalation increases the slope displacement of creep section and has no obvious influence on the displacement of shear section. Higher continuity of muddy intercalation induces larger cumulative sliding displacement as expected. The sensitivity analysis results show that the cumulative sliding displacement under repeated blasting vibrations is influenced by shear modulus, followed by dip angle and continuity of muddy intercalation.

     

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