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考虑爆破累积损伤的含泥化夹层边坡滑移分析
闫长斌1, 张彦昌1, 陈艳国2
1.郑州大学 土木工程学院;2.黄河勘测规划设计研究院有限公司
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。
关键词:  边坡  泥化夹层  爆破振动  滑块位移法  累积损伤  强度折减  敏感性分析
DOI:
分类号:TU457;P642
基金项目:国家自然科学基金资助项目(41972270,U1504523),河南省重点研发与推广专项(182102210014)
Analysis on sliding displacement of slope with muddy intercalation considering blasting cumulative damage
YAN Chang-bin1, ZHANG Yan-chang1, CHEN Yan-guo2
1.School of Civil Engineering,Zhengzhou University;2.Yellow River Engineering Consulting Co,Ltd,Zhengzhou
Abstract:
Repeated blasting vibration is an important factor to induce landslides, especially complex rock slopes with muddy intercalation. To reveal the failure mechanism of complex rock slope with muddy intercalation under many times of blasting vibration, according to the law of conservation of energy, based on Newmark slider displacement method, a method for calculating cumulative sliding displacement and predicting critical blasting times of complex rock slope with muddy intercalation under many times of blasting vibration was established. In this method, the blasting cumulative damage effect was considered and the strength reduction factors of muddy intercalation were introduced. Meanwhile, the impact of muddy intercalation parameters, e.g. shear modulus, dip angle and continuity on the cumulative sliding displacement of slope was discussed, and the sensitivity of parameters was analyzed as well. The results show that considering the deterioration of strength parameters of muddy intercalation caused by blasting cumulative damage effect, the results of calculating cumulative sliding displacement and predicting critical blasting vibration times are more reasonable. The parameters of muddy intercalation have a significant influence on the cumulative sliding displacement of slope under many times of blasting vibration. With the increase of shear modulus of muddy intercalation, the deformation resistance of slope increases and the displacement decreases. With the increase of dip angle of muddy intercalation, the displacement of shear section has not obvious change, while the displacement of creep section increases significantly, and the total cumulative displacement decreases. The higher the continuity of muddy intercalation is, the more the cumulative sliding displacement of slope is. The sensitivity analysis of muddy intercalation parameters shows that the influence of shear modulus on cumulative sliding displacement under many times of blasting vibration is greater, second is the dip angle and third is the continuity of muddy intercalation.
Key words:  slope  muddy intercalation  blasting vibration  slider displacement method  cumulative damage  strength reduction  sensitivity analysis
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