强震作用下反倾薄层岩质斜坡倾倒破坏机制及动力响应研究

PDF(3282 KB)

振动与冲击 ›› 2023, Vol. 42 ›› Issue (20) : 263-274.

论文

龚逸非，姚爱军，谷坤生，李彦霖，田甜

作者信息 +

Dynamic response and failure process of anti-dip rock slope under strong earthquake

GONG Yifei, YAO Aijun, GU Kunsheng, LI Yanlin, TIAN Tian

Author information +

文章历史 +

摘要

反倾岩质边坡在三江并流地区具有广泛的发育和分布，其变形和破坏现象在该区域内所有边坡问题中，尤为突出，地震是诱发滑坡的重要动力因素，常常导致大规模的滑坡灾害。本文以金沙江左岸宗绒历史性堵江滑坡为例，设计并完成了缩尺相似材料振动台物理模型试验。通过加载不同类型的地震波以及不同频率、幅值，研究反倾薄层岩质斜坡的动力响应和变形破坏机制以及软弱破碎带的影响。试验结果表明：反倾岩质斜坡在强震作用下存在高程放大效应和趋表效应，幅值越大越明显。斜坡加速度放大系数增长速率受频率的影响要高于幅值的影响，在不同幅值下，加速度放大系数最大值出现在0.2g~0.3g。软弱破碎带的存在改变了斜坡动力响应特征，其厚度对地震波的放大效应存在明显的差异，为厚层段抑制，薄层段放大。幅值0.3g~0.4g为斜坡启裂的临界动力条件，0.7~0.8g是斜坡失稳破坏的临界动力条件，其破坏过程大致可以分为三个阶段：（1）形成坡顶张拉裂缝和坡趾剪切裂缝；（2）裂缝的扩展和浅层块体的剪切破坏滑动-块状倾倒；（3）斜坡浅层的主滑面的形成，斜坡破坏。

Abstract

Anti-dip rock slopes have a wide development and distribution in the Sanjiang rivers, and their deformation and damage phenomena are particularly prominent among all slope problems in the region. Earthquake is an important dynamic factor to induce landslides, which often leads to large-scale landslide disasters. In this paper, a model test of a reduced scale similar material shaking table was designed and completed using the historical landslide dam at Zongrong on the left bank of the Jinsha River as an example. By loading different types of seismic waves as well as different frequencies and amplitudes, the dynamic response and deformation damage mechanisms of anti-dip rock slopes and the influence of structural surfaces are investigated. The test results show that there is an elevation amplification effect and skin effect on anti-dip slopes under strong seismic action, the larger the amplitude, the more obvious it is. The rate of increase of the slope acceleration amplification factor is influenced more by frequency than by amplitude. The maximum values of the acceleration amplification factor occur at 0.2g to 0.3g for different amplitude values. The presence of structural surfaces changes the dynamic response characteristics of the slope, and there is a clear difference in the amplification effect of their thickness on seismic waves, as thicker sections are suppressed and thinner sections are amplified. Amplitude 0.3g~0.4g is the critical dynamic condition for slope cracking and 0.7~0.8g is the critical dynamic condition for slope destabilisation damage. The slope damage process can be broadly divided into three stages: (1) The formation of top-of-slope tension cracks and toe-of-slope shear cracks; (2) The expansion of cracks and shallow block shear damage sliding-block toppling; (3) The formation of the main slip surface of the shallow slope and slope damage.

引用本文

EndNote

Ris (Procite)

Bibtex

导出引用

龚逸非，姚爱军，谷坤生，李彦霖，田甜. 强震作用下反倾薄层岩质斜坡倾倒破坏机制及动力响应研究[J]. 振动与冲击, 2023, 42(20): 263-274

GONG Yifei, YAO Aijun, GU Kunsheng, LI Yanlin, TIAN Tian. Dynamic response and failure process of anti-dip rock slope under strong earthquake[J]. Journal of Vibration and Shock, 2023, 42(20): 263-274

参考文献

[1] 戴福初, 邓建辉. 青藏高原东南三江流域滑坡灾害发育特征[J].工程科学与技术, 2020, 52(5):13.
DAI Fuchu, DENG Jianhui. Development Characteristics of Landslide Hazards in Three-rivers Basin of Southeast Tibetan Plateau[J]. Advanced Engineering Sciences, 2020, 52(5):13.
[2] 彭建兵, 崔鹏, 庄建琦.川藏铁路对工程地质提出的挑战[J].岩石力学与工程学报,2020,39(12):2377-2389.
PENG Jianbing, CUI Peng, ZHUANG Jianqi. Challenges to engineering geology of Sichuan—Tibet railway[J]. Chinese Journal of Rock Mechanics and Engineering, 2020,39(12):2377-2389.
[3] 梁靖,崔圣华,裴向军,黄润秋.考虑岩体构造损伤的强震大型滑坡启动成因[J].岩土工程学报,2021,43(06):1039-1049.
LIANG Jing, CUI Sheng-hua, PEI Xiangjun, et al. Initiation mechanism of earthquake-induced large landslides considering structural damage[J]. Chinese Journal of Geotechnical Engineering, 2021,43(06):1039-1049.
[4] 郭明珠,谷坤生,梁洲婕,王天成.强震作用下反倾岩质斜坡动力特性及动力参数影响研究[J].沈阳建筑大学学报(自然科学版),2022,38(02):279-287.
GUO Mingzhu, GU Kunsheng, LIANG Zhoujie, et al. Research on Dynamic Characteristics and Dynamic Parameters of Anti-dip Rock Slope under Earthquakes[J]. Journal of Shenyang Jianzhu University (Natural Science),2022,38(02):279-287.
[5] 刘汉香,周逸飞,李欣.层状复合岩体边坡动力特性及地震响应特性的振动台试验研究[J].岩石力学与工程学报,2021,40(04):676-689.
LIU Hanxiang, ZHOU Yifei, LI Xin. Shaking table test of dynamic responses of a layered complex rock slope under earthquake[J]. Chinese Journal of Rock Mechanics and Engineering, 2021,40(04):676-689.
[6] 杨忠平,李诗琪,李万坤,李进,胡元鑫.频发微震下含水率对堆积体斜坡动力响应规律及失稳模式的影响[J].岩土工程学报,2021,43(05):822-831.
YANG Zhongping, LI Shiqi, LI Wankun, et al. Effect of moisture content on dynamic response law and failure mode of accumulation slopes under frequent micro-seismic actions[J]. Chinese Journal of Geotechnical Engineering,2021,43(05):822-831.
[7] 谢良甫. 反倾层状岩质斜坡倾倒变形特征及演化机理研究[D].中国地质大学,2015.
XIE Liangfu. Research on Characteristics and Evolution Mechanism of Toppling Deformation of Anti-dip Stratified Rock Slope[D]. China Unversity of Geoscience,2015.
[8] 岑夺丰,黄达,黄润秋.块裂反倾巨厚层状岩质边坡变形破坏颗粒流模拟及稳定性分析[J].中南大学学报(自然科学版),2016,47(03):984-993.
CEN Duofeng, HUANG Da, HUANG Runqiu. Simulation of deformation and failure for blocky anti-dip thick-layered rock slopes using particle flow code and analysis on its stability[J]. Journal of Central South University (Science and Technology) ,2016,47(03):984-993.
[9] 言志信,张森,龙哲,周小亮.地震作用下顺倾岩体边坡锚固界面剪切作用分析[J].振动与冲击,2020,39(03):260-268.
YAN Zhixin, ZHANG Sen, LONG Zhe, ZHOU Xiaoliang. Shear action analysis for inclined rock side slope anchorage interface under earthquake [J]. Journal Of Vibration and Shock,2020,39(03):260-268.
[10] 言志信,李亚鹏,龙哲,翟聚云.双向耦合地震作用下含软弱层岩质边坡锚固界面剪切作用[J].振动与冲击,2020,39(11):158-164.
YAN Zhixin, LI Yapeng, LONG Zhe, ZHAI Juyun. Shearing action of anchorage interface of rock slope with soft layer under bidirectional coupled earthquake[J]. Journal Of Vibration and Shock, 2020,39(11):158-164.
[11] 郭明珠,谷坤生,王天成.反倾岩质斜坡振动台试验研究综述[J].工程抗震与加固改造,2021,43(06):157-167.
Guo Mingzhu, Gu Kunsheng, Wang Tiancheng. Summary of Shaking Table Test Research On Anti-dip Rock Slope[J]. Earthquake Resistant Engineering and Resteofitting, 2021,43(06):157-167.
[12]巨能攀,李龙起,黄润秋.陡倾顺层斜坡动力失稳机理分析[J].工程科学与技术,2018,50(03):54-63.
Ju Nengpan, Li Longqi, Huang Runqiu. Dynamic Failure Mechanism Study of Steep Bedding Rock Slopes[J]. Advanced Engineering Sciences,2018,50(03):54-63.
[13] 刘汉东,牛林峰,袁富强,王忠福,姚亮,宁长春.地震波频率对层状岩质边坡动力响应影响的试验研究[J].水文地质工程地质,2018,45(02):77-83.
LIU Handong, NIU Linfeng, YUAN Fuqiang, et al. Test research on the influence of seismic wave frequency on the dynamic response of a layered rock slope[J]. Hydrogeology＆Engineering Geology,2018,45(02):77-83.
[14] 杨国香,伍法权,董金玉,祁生文.地震作用下岩质边坡动力响应特性及变形破坏机制研究[J].岩石力学与工程学报,2012,31(04):696-702.
YANG Guoxinag, WU Faquan, DONG Jinyu, et al. Study of Dynamic Response Characters and Failue Mechanism of Rock Slope Under Earthquake[J]. Chinese Journal of Rock Mechanics and Engineering, 2012,31(04):696-702.
[15] 杨国香,叶海林,伍法权,祁生文,董金玉.反倾层状结构岩质边坡动力响应特性及破坏机制振动台模型试验研究[J].岩石力学与工程学报,2012,31(11):2214-2221.
YANG Guoxiang, YE Hailin, WU Faquan, et al. Shaking Table Model Test on Dynamic Response Characteristics and Failure Mechanism of Antidip Layered Rock Slope[J]. Chinese Journal of Rock Mechanics and Engineering, 2012,31(11):2214-2221.
[16] GISCHIG V S，EBERHARDT E，MOORE J R，et al. On the seismic response of deep-seated rock slope instabilities-Insights from numerical modeling[J]. Engineering Geology，2015，193：1-18.
[17] 范刚,张建经,付晓.含泥化夹层顺层和反倾岩质边坡动力响应差异性研究[J].岩土工程学报,2015,37(04):692-699.
FAN Gang, ZHANG Jian-jing, FU Xiao. Dynamic response differences between bedding and count-tilt rock slopes with siltized intercalation[J]. Chinese Journal of Geotechnical Engineering,2015,37(04):692-699.
[18] 张家明.含软弱夹层岩质边坡稳定性研究现状及发展趋势[J].工程地质学报,2020,28(03):626-638.
Zhang Jiaming. 2020. State of art and trends of rock slope stability with soft interlayer[J]. Journal of Engineering Geology, 28( 3) : 626－638．
[19] 周逸飞,刘汉香,朱星,文佳豪.含软弱夹层岩质边坡的模态分析及其对边坡地震动力响应影响的初步研究[J].地震工程与工程振动,2020,40(01):223-232.
ZHOU Yifei, LIU Hanxiang, ZHU Xing et al. Modal analysis of rock slope with a weak interlayer and its influence on seismic dynamic response of slope[J]. Earthquake Engineering and Engineering Dynamics[J] ,2020,40(01):223-232.
[20] 张彦君,年廷凯,王亮,唐军.岩质边坡物理模型试验相似材料研究[J].西南交通大学学报,2019,54(01):55-60+72.
ZHANG Yanjun, NIAN Tingkai, WANG Liang, et al. Research on Similar Materials for Physical Model Tests of Rock Slopes[J]. Journal of Southwest Jiaotong Unversity,2019,54(01):55-60+72.
[21] 詹志发,贺建先,郑博文,祁生文.边坡模型相似材料配比试验研究[J].地球物理学进展,2019,34(03):1236-1243.
ZHAN Zhifa, HE Jianxian, ZHENG Bowen, et al. Experimental study on similar material proportion of slope model [J]．Progress in Geophysics 2019,34(03):1236-1243.
[22] 巨能攀,邓天鑫,李龙起,蒋金阳,张陈羊.强震作用下陡倾顺层斜坡倾倒变形机制离心振动台试验[J].岩土力学,2019,40(01):99-108+117.
JU Nengpan, DENG Tianxin, LI Longqi, et al. Centrifugal shaking table test on toppling deformation mechanism of steep bedding slope under strong earthquake[J]. Rock and Soil Mechanics, 2019,40(01):99-108+117.