›› 2018, Vol. 39 ›› Issue (5): 1811-1824.doi: 10.16285/j.rsm.2016.0925

• 岩土工程研究 • 上一篇    下一篇

地下洞室地震动力响应的岩体结构控制效应

崔 臻1, 2,盛 谦1, 2,冷先伦1, 2,罗庆姿3   

  1. 1. 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;2. 中国科学院大学,北京 100049; 3. 广东工业大学 土木与交通工程学院,广东 广州 510006
  • 收稿日期:2016-04-22 出版日期:2018-05-11 发布日期:2018-06-12
  • 作者简介:崔臻,男,1986年生,博士(后),副研究员,主要从事岩土工程静动力稳定性评价方面的研究。
  • 基金资助:

    国家重点基础研究发展计划(973)项目(No. 2015CB057905);国家自然科学基金资助项目(No. 51779253,No. 41672319);国家重点研发计划(No. 2016YFC0401803);广东省自然科学基金(No. 2016A030310345)。

Control effect of large geological discontinuity on seismic response and stability of underground rock caverns

CUI Zhen1, 2, SHENG Qian1, 2, LENG Xian-lun1, 2, LUO Qing-zi3   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2.University of Chinese Academy of Sciences, Beijing 100049, China; 3. School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou, Guangdong 510006, China
  • Received:2016-04-22 Online:2018-05-11 Published:2018-06-12
  • Supported by:

    This work was supported by the National Basic Research Program of China (2015CB057905), the National Natural Science Foundation of China (51779253, 41672319), the National Key R&D Program of China (2016YFC0401803) and Guangdong Natural Science Foundation (2016A030310345).

摘要: 为了评价在层间错动带C2影响下白鹤滩地下洞室群尾调室在地震作用下的稳定性,针对其在试验中表现出来的明显的延性及法向荷载依赖性等特征,一种非线性的连续屈服(CY)模型被采用,用来描述层间错动带在静力以及地震动力作用下的复杂力学特性。在CY模型中,非连续面的变形特性采用幂函数形式表述,并且考虑了剪切破坏过程中强度的渐进性破坏。CY模型预测的C2错动带的力学行为与试验获取的结果相比较差异非常小,证明了CY模型在静力作用下的适用性。基于位移非连续假设的应力波透射理论被用来论证CY模型在动态作用下的适用性,同时将结果与线性结构面本构模型的结果进行了对比。比较结果表明,CY模型预测的规律与已有文献利用其他非线性模型得到的结论基本相同,并优于线性本构模型,理论结果在数值软件中得到了验证。3条地震波在经过特殊的反应谱匹配处理后,对白鹤滩地下洞室左岸1#尾调室进行了地震动力响应分析。分析结果表明,C2错动带在地震作用下对尾调室的变形及稳定性有明显的控制作用。地震作用下洞室整体运动趋势以刚体位移为主,岩体间相对变形为辅。相对变形中,错动带C2的相对变形占据了较大的成分。C2的相对变形以接触面上下盘的切向错动变形为主,主要发生部位为洞室顺C2走向的部位;结构面上、下盘法向变形为辅,主要发生在洞室顺C2倾向部位。通过超载法,获取了洞室的地震动力安全裕度。当超载系数从2增加到3时,C2的剪切变形、洞室的塑性区指标均剧烈增加,显示洞室的安全裕度大约在2~3之间,即洞室最大可抗拒峰值加速度为438g~657g的地震动作用。研究结论可供地下洞室的抗震设计与分析参考。

关键词: 地下洞室, 地震稳定性, 结构面型破坏, 离散单元法, 连续屈服模型

Abstract: This paper studied the seismic stability of the 1# surge chamber in the Baihetan hydropower plant under the influence of interlayer shear weakness zone (ISWZ) C2 regarded as the large dominating geological discontinuity. Based on the dependent behaviour of normal stress, a nonlinear continuous yielding (CY) model was adopted to describe the complex mechanical properties of the ISWZ C2 under static and seismic dynamics. In this model, the deformation characteristics of the discontinuity surface were expressed in terms of a power function, and the progressive destruction of the strength during shear failure was also considered. Besides, 3DEC software was applied to verify the CY model. Then the applicability of the CY model was proved by comparing experimental results with theoretical solutions. Three ground motion waveforms were utilised to conduct the seismic analysis of the #1 surge chamber after the special response spectrum matching process. The seismic analysis confirmed the control effect of ISWZ C2 on the seismic stability of the cavern. The seismic displacement of the cavern was mainly the elastic body movement and was supplemented by the plastic deformation. Furthermore, most of the deformations were caused by the contact deformation of C2. For the contact deformation of C2, the magnitude of permanent shear deformation was larger than that of the normal deformation. The magnitude of permanent shear deformation was more obvious along the strike direction of C2, and the permanent normal displacement of C2 mainly occurred along the dip direction of C2. Finally, the seismic stability of the cavern was determined by the overload method. The measured seismic safety factor of the cavern was approximately 2~3. The findings in this study may provide helpful references for the seismic design of the underground caverns.

Key words: underground cavern, seismic stability, structural failure, discrete element method, continuously yielding model

中图分类号: 

  • TU 452

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