地震作用下软硬互层顺层岩质边坡动力响应研究

李师毓; 吴琼; 王亮清; 罗红明; 秦越; 刘智琪

doi:10.3799/dqkx.2023.002

地震作用下软硬互层顺层岩质边坡动力响应研究

doi: 10.3799/dqkx.2023.002

1. 中国地质大学工程学院, 湖北武汉 430074;
2. 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室, 湖北武汉 430071

基金项目:

国家重点研发计划项目（2019YFC1509705）；国家重点研发计划项目（2022YFC3080200）；国家自然科学基金面上项目（No.41877259）

详细信息

作者简介:
李师毓(1998-),男,硕士研究生,主要从事地质灾害与岩土工程方面的研究,E-mail:269952725@qq.com,ORCID:0000-0003-2612-344X,Tel:15827553306

通讯作者:
吴琼(1985-),女,教授,博士,博士生导师,主要从事岩体结构和岩体力学参数研究,E-mail:wuqiong@cug.edu.cn,ORCID:0000-0001-5029-5925,Tel:15392942198

中图分类号: P642
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- 文章访问数: 135
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出版历程
- 收稿日期: 2022-10-20
- 网络出版日期: 2023-05-09

Study of Dynamic Response of Soft and Hard Interbedded Rock Slopes Under Earthquakes

1. Faculty of Engineering, China University of Geosciences, Wuhan 430074, China;
2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Science, Wuhan 430071, China

摘要

摘要: (目的)软硬互层顺层岩质边坡在我国强震区广泛存在，地震极易诱发该类边坡产生地质灾害。(方法)本文针对地震作用下软硬互层顺层岩质边坡动力响应关键科学问题开展研究，基于离散元数值模拟法，揭示了软硬互层顺层岩质边坡动力响应规律，分析了不同边坡特征因素对其动力响应的影响。(结果和结论)结果表明：地震作用下软硬互层边坡变形破坏主要受软硬岩间层面控制，坡表剪切口和软岩位移增量明显；地震波在传播过程中，软硬岩层对地震加速度具有放大作用，其中软岩的放大作用更明显；地震波频谱特征显示：当地震波从硬岩传播至软岩时，多个固定频段被显著放大，当从软岩传播至硬岩时，频谱有所降低；坡表位移和加速度放大系数随软岩和层面强度的增加而减小，随层厚比的增加而增大；软岩强度和层厚比会改变地震波中显著放大频段的位置，二者增大时，放大频段的数量不变，频率减小；岩层层面强度降低时，放大频段的数量和频率不变，放大程度增大。
- 软硬互层岩质边坡 /
- 地震 /
- 动力响应 /
- 数值模拟 /
- 离散元
Abstract: Soft and hard interbedded rock slopes are widely distributed in meizoseismal areas of China and geological disasters are prone to be induced on such slopes due to earthquakes. In this paper, the key scientific issues of the dynamic response of soft and hard interbedded rock slopes under earthquakes were studied. The discrete element numerical simulation method was used to reveal the dynamic response of soft and hard interbedded rock slopes and influences of different slope factors on the dynamic response. The results show that bedding planes between soft and hard rocks play a main control role in the deformation and failure of the slope. Displacements obviously increase on the shear outlets and soft rock of the slope surface. Accelerations of seismic waves are amplified by soft and hard strata during the propagation of seismic wave and soft rocks have a significant amplification effect on the accelerations. The seismic wave spectra show that multiple fixed frequency bands are obviously amplified when the seismic wave propagates from hard rocks to soft rocks; the spectra decrease when the seismic wave propagates from soft rocks to hard rocks. The displacements and the amplification coefficients of acceleration decrease with the increase of the strength of soft rocks and bedding planes, while increase with the increase of thickness ratio. The locations of obviously amplified frequency bands are influenced by the strength of soft rocks and bedding planes. When the strength of soft rocks and bedding planes increase, the number of amplified bands remains the same and frequencies decrease. The reduction of the strength of bedding planes will not change the number and frequency of the amplified bands, but increase the degree of amplification.
- soft and hard interbedded rock slope /
- earthquake /
- dynamic response /
- numerical simulation /
- discrete element

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参考文献(41)

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地震作用下软硬互层顺层岩质边坡动力响应研究

doi: 10.3799/dqkx.2023.002

作者简介:
李师毓(1998-),男,硕士研究生,主要从事地质灾害与岩土工程方面的研究,E-mail:269952725@qq.com,ORCID:0000-0003-2612-344X,Tel:15827553306

通讯作者:
吴琼(1985-),女,教授,博士,博士生导师,主要从事岩体结构和岩体力学参数研究,E-mail:wuqiong@cug.edu.cn,ORCID:0000-0001-5029-5925,Tel:15392942198

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Study of Dynamic Response of Soft and Hard Interbedded Rock Slopes Under Earthquakes

计量

目录

留言板

地震作用下软硬互层顺层岩质边坡动力响应研究

doi: 10.3799/dqkx.2023.002

作者简介: 李师毓(1998-),男,硕士研究生,主要从事地质灾害与岩土工程方面的研究,E-mail:269952725@qq.com,ORCID:0000-0003-2612-344X,Tel:15827553306

通讯作者: 吴琼(1985-),女,教授,博士,博士生导师,主要从事岩体结构和岩体力学参数研究,E-mail:wuqiong@cug.edu.cn,ORCID:0000-0001-5029-5925,Tel:15392942198

计量

出版历程

Study of Dynamic Response of Soft and Hard Interbedded Rock Slopes Under Earthquakes

计量

出版历程

目录

作者简介:
李师毓(1998-),男,硕士研究生,主要从事地质灾害与岩土工程方面的研究,E-mail:269952725@qq.com,ORCID:0000-0003-2612-344X,Tel:15827553306

通讯作者:
吴琼(1985-),女,教授,博士,博士生导师,主要从事岩体结构和岩体力学参数研究,E-mail:wuqiong@cug.edu.cn,ORCID:0000-0001-5029-5925,Tel:15392942198