以地震作用下的非贯通节理岩质斜坡为研究对象,利用大型有限元软件ANSYS建立数值模型。数值模拟结果表明:地震作用下非贯通节理岩质斜坡的稳定系数受结构面的长度、密度、贯通率、展布方向等因素影响;节理面的位移放大效应和变形积累效应明显;岩桥的破坏在地震初期比较剧烈,之后在地震作用下继续发生破坏,在经过地震波波幅较大的波段后,斜坡的变形破坏才稳定下来;地震作用下,岩桥内部应力波动剧烈,拉剪共同作用导致了岩桥的最终破坏;层间节理位移和层间摩擦应力分布很不均匀,不同位置的节理的动力响应也有较大不同。
Abstract
Finite element software ANSYS was used to establish a numerical model to research the rock slope containing intermittent joints under earthquake. Numerical simulation results showed that: under earthquake action, the stability coefficient of rock slope with intermittent joints was influenced by the length density, rate of connectivity, spreading directions of structural planes; the displacement amplification effect and deformation accumulation effect of joint surface were obvious. In the early stage of earthquake action, the damage of rock bridges was very violent, and then the damage continued under earthquake. The deformation and failure of slope stabilized until after large amplitude band. Moreover, the internal stress of the rock bridges fluctuated remarkably under earthquake, and the tension action and shearing action together led to the final failure of the noncoalescence regions; the contact sliding distance and frictional stress between layers distributed very unevenly, and the dynamic response of joints at different positions were quite different.
关键词
岩质斜坡 /
破坏机制 /
地震作用 /
非贯通节理 /
数值模拟 /
位移时程曲线
Key words
rock slope /
failure mechanism /
earthquake action /
intermittent joints /
numerical simulation /
timehistory curve of displacement
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参考文献
[1] 石崇,徐卫亚,周家文. 小波包分析在节理岩体动力计算中的应用研究[J] . 振动与冲击,2007,26(11),1-4. (SHI Chong, XU Wei-ya, ZHOU Jia-wen. Application of Wavelet Packet Analysis in Dynamic Computation of Jointed Rock Mass[J] . Journal of Vibration and Shock, 2007, 26(11): 1-4. (in Chinese))
[2] 刘力平,雷尊宇,周富春. 地震边坡稳定分析方法综述[J] . 重庆交通学院学报,2001,20(3):83-88. (LIU Li-ping, LEI Zun-yu, ZHOU Fu-chun. Overview on Seismic Slope Stability Analysis Methods[J] . Journal of Chongqing Jiao-tong University, 2001, 20(3):83-88.(in Chinese))
[3] 陈强,汪洋,周锋,等. 岩质边坡弹塑性地震响应分析[J] . raybet体育在线
院报,2013,30(12):60-64. (CHEN Qiang, WANG Yang, ZHOU Feng, et al. Seismic Response of Rock Slope Elasto-plasticity[J] . Journal of Yangtze River Scientific Research Institute, 2013, 30(12): 60-64.(in Chinese))
[4] 蒋楠,周传波,平雯,等. 岩质边坡爆破振动速度高程效应[J] . 中南大学学报(自然科学版),2014,45(1):238-243. (JIANG Nan, ZHOU Chuan-bo, PING Wen,et al. Altitude Effect of Blasting Vibration Velocity in Rock Slopes[J] . Journal of Central South University (Science and Technology), 2014, 45(1): 238-243. (in Chinese))
[5] 倪振强,孔纪名,阿发友,等. 地震作用下折线型滑面斜坡的动力响应[J] . 四川大学学报(工程科学版),2011,43(1):1-6. (NI Zhen-qiang, KONG Ji-ming, A Fa-you, et al. Dynamic Response of Slope with Broken Line Slip Surface under Action of Earthquake[J] . Journal of Sichuan University (Engineering Science), 2011, 43(1): 1-6.(in Chinese))
[6] 郑颖人,叶海林,黄润秋,等. 边坡地震稳定性分析探讨[J] . 地震工程与工程振动,2010,30(2):173-180.(ZHENG Ying-ren, YE Hai-lin, HUANG Run-qiu, et al. Study on the Seismic Stability Analysis of a Slope[J] . Journal of Earthquake Engineering and Engineering Vibration, 2010, 30(2): 173-180.(in Chinese))
[7] 郑颖人. 岩土数值极限分析方法的发展与应用[J] . 岩石力学与工程学报,2012,31(7):1297-1316.(ZHENG Ying-ren, YE Hai-lin, HUANG Run-qiu, et al. Study on the Seismic Stability Analysis of a Slope[J] . Journal of Earthquake Engineering and Engineering Vibration, 2012,31(7):1297-1316.(in Chinese))
[8] 张国栋,陈飞,金星,等. 边界条件设置及输入地震波特性对边坡动力响应影响分析[J] . 振动与冲击,2011,30(1):102-127.(ZHANG Guo-dong, CHEN Fei, JIN Xing, et al. Effect of Different Boundary Conditions and Seismic Waves on Seismic Response of Slope[J] . Journal of Vibration and Shock, 2011, 30(1): 102-127.(in Chinese))
[9] 郑颖人,赵尚毅,邓卫东. 岩质边坡破坏机制有限元数值模拟分析[J] . 岩石力学与工程学报,2003,22(12):1943-1952.(ZHENG Ying-ren, ZHAO Shang-yi, DENG Wei-dong. Numerical Simulation on Failure Mechanism of Rock Slope by Strength Reduction FEM[J] . Chinese Journal of Rock Mechanics and Engineering, 2003, 22(12):1943-1952.(in Chinese))
[10] 水利水电科学研究院. 岩石力学参数手册[K] . 北京:水利电力出版社,1991. (China Institute of Water Resources and Hydropower Research. Handbook for Mechanical Parameters of Rock[K] . Beijing: Water Conservancy and Electric Power Press, 1991. (in Chinese))
[11] A F Y, KONG J M, NI Z Q. Model Test on Deformation and Failure of Excavated Anti-dip Slope under Seismic Loading[J] . Disaster Advances, 2012, 5(2): 41-47.
[12] 阿发友,孔纪名,倪振强. 地震荷载作用下中–缓倾角顺层开挖斜坡的变形破坏模型试验[J] . 岩石力学与工程学报,2012,31(增1):3437-3443. (A Fa-you, KONG Ji-ming, NI Zhen-qiang. Deformation and Failure Model Test of Moderate-slow Dip Excavation Bedding Slope under Action of Seismic Load[J] . Chinese Journal of Rock Mechanics and Engineering, 2012, 31(Sup.1): 3437-3443. (in Chinese))
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