地震作用下堆积体边坡振动台模型试验及抛出现象分析

刘婧雯; 黄博; 邓辉; 凌道盛; 郭晓光; 高美奔

doi:10.11779/CJGE201402006

地震作用下堆积体边坡振动台模型试验及抛出现象分析 English Version

1. 浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310058; 2. 成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059

详细信息

作者简介:
刘婧雯(1988- )，女，硕士研究生，主要从事土动力学研究。E-mail: liujingwen198807@163.com。

通讯作者:
黄博

中图分类号: TU411
计量
- 文章访问数: 0370
- HTML全文浏览量: 0
- PDF下载量: 0420
出版历程
- 收稿日期: 2013-05-16
- 发布日期: 2014-02-20

Shaking table tests and throwing phenomenon of deposit slopes under earthquakes

1. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China; 2. State Key Laboratory of Geo-Hazard Prevention and Geo-Environment Protection, Chengdu University of Technology, Chengdu 610059, China

摘要

摘要: 国道213线都江堰-汶川段普遍发育着堆积体边坡。在“5.12汶川地震”中,此类边坡更易发生滑坡灾害,并伴有独特的山石抛出现象。结合堆积体边坡实例进行振动台模型试验,研究堆积体边坡在多次地震作用下结构损伤累积并最终发生失稳的特征及边坡破坏模式。试验结果表明：堆积体边坡中上覆堆积体与下部基岩存在动力响应差异,边坡滑坡形式不同于静力失稳,表现为裂缝一旦出现便迅速扩展,边坡坡肩处部分小块体在水平和垂直向动力耦合作用下与原结构脱离抛出,这与汶川地震后边坡调研中发现的抛出现象一致。分析了模型边坡块体抛出现象与裂纹形成角度的关系,只有当裂纹角度和竖向加速度组合满足一定的触发条件时,才可能出现抛出现象。
- 堆积体边坡 /
- 物理模拟 /
- 地震破坏机制 /
- 抛出现象
Abstract: The deposit slope is very typical along the highway from Dujiangyan to Wenchuan, China, where “5.12” Wenchuan Earthquake took place. The investigation of “5.12” Wenchuan Earthquake shows that most of the landslides occur in those slopes. In order to study the seismic failure mode of this kind of widely distributed slope, 1g shaking table model tests are carried out to study the mechanism of slope instability. According to the test results, difference responses between the deposit and the rock bed under dynamic conditions make the failure mode of the deposit slope different from those under the static conditions. A throwing phenomenon occurs at the upper part under the combination of horizontal and vertical shaking, which is widely reported in “5.12” Wenchuan Earthquake. A mathematical model is established to analyze the throwing phenomenon under earthquakes, and it is found that this phenomenon can happen only when the crack opening angle meets some conditions.
- deposit slope /
- physical model /
- seismic failure mechanism /
- throwing phenomenon

HTML全文

参考文献(9)

[1]	廖秋林, 李晓, 郝钊. 土石混合体的研究现状及研究展望[J]. 工程地质学报, 2006, 14(6): 800-807. (LIAO Qiu-lin, LI Xiao, HAO Zhao. Current status and future trends of studies on rockand soil aggregates[J]. Journal of Engineering Geology, 2006, 14(6): 800-807. (in Chinese))
[2]	吉随旺, 唐永建, 胡德贵, 等. 四川省汶川地震灾区干线公路典型震害特征分析[J]. 岩石力学与工程学报, 2009, 28(6): 1250-1260. (JI Sui-wang, TANG Yong-jian, HU De-gui, et al. Analysis of typical seismic damages of highways in Wenchuan Earthquake-induced hazard areas in Sichuan Province[J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 28(6): 1250-1260. (in Chinese))
[3]	许强, 黄润秋. “5.12”汶川大地震诱发大型崩滑灾害动力特征初探[J]. 工程地质学报, 2008, 16(6): 721-729. (XU Qiang, HUANG Run-qiu. Kinetics characteristics of large landslides triggered by Wenchuan Earthquake on 12th May[J]. Journal of Engineering Geology, 2008, 16(6): 721-729. (in Chinese))
[4]	黄润秋. 汶川8.0 级地震触发崩滑灾害机制及其地质力学模式[J]. 岩石力学与工程学报, 2009, 28(6): 1239-1249. (HUANG Run-qiu. Mechanism and geomechanical modes of landslide hazards triggered by Wenchuan 8.0 Earthquake[J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 28(6): 1239-1249. (in Chinese))
[5]	王运生, 徐鸿彪, 罗永红, 等. 地震高位滑坡形成条件及抛射运动程式研究[J]. 岩石力学与工程学报, 2009, 28(11): 2360-2368. (WANG Yun-sheng, XU Hong-biao, LUO Yong-hong, et al. Study of formation conditions and toss motion program of high landslides induced by earthquake[J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 28(11): 2360-2368. (in Chinese))
[6]	肖锐铧, 许强, 冯文凯, 等. 强震条件下双面坡变形破坏机理的振动台物理模拟试验研究[J]. 工程地质学报, 2010, 18(6): 837-843. (XIAO Rui-hua, XU Qiang, FENG Wen-kai, et al. Shaking table simulation experiment on ddformation failure mechanism of double sides slope in condition in tense earthquake[J]. Journal of Engineering Geology, 2010, 18(6): 837-843. (in Chinese)
[7]	徐光兴, 姚令侃, 高召宁, 等. 边坡动力特性与动力响应的大型振动台模型试验研究[J]. 岩石力学与工程学报, 2008, 27(3): 624-632. (XU Guang-xing, YAO Ling-kan, GAO Zhao-ning, et al. Large scale shaking table model test study on dynamic characteristic sand dynamic responses of slope[J]. Journal of Rock Mechanics and Engineering.2008, 27(3): 624-632. (in Chinese))
[8]	郑敏政. 地震模拟实验中相似律应用的若干问题[J]. 地震工程与工程振动, 1997, 17(2): 52-58. (ZHANG Min-zheng. Study on similtude laws for shaking table tests[J]. Earthquake Engineering and Engineering Vibration, 1997, 17(2): 52-58. (in Chinese))
[9]	左保成, 陈从新, 刘才华, 等. 相似材料试验研究[J]. 岩土力学, 2004, 25(11): 1805-1808. (ZHUO Bao-cheng, CHEN Cong-xin, LIU Cai-hua, et al. Research on similar material of slope simulation experiment[J]. Rock and Soil Mechanics, 2004, 25(11): 1805-1808. (in Chinese))