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工程地质学报  2018, Vol. 26 Issue (6): 1585-1592    DOI: 10.13544/j.cnki.jeg.2017-430
地质灾害与斜坡稳定性 最新目录 | 下期目录 | 过刊浏览 | 高级检索  |   
充分考虑振动台实验滑移特征的地震滑坡基本单元体永久位移估算方法研究
钱海涛1, 肖锐铧2
1. 中国地震局地壳应力研究所 北京 100085;
2. 自然资源部地质灾害防治技术指导中心 北京 100081
AN ESTIMATION METHOD FOR PERMANENT DISPLACEMENTS OF BASIC EARTHQUAKE LANDSLIDE MODEL WITH FULL CONSIDERATION OF SLID CHARACTERS FROM SHAKE TABLE TESTS
QIAN Haitao1, XIAO Ruihua2
1. Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085;
2. Consultative Centre for Geo-Hazard Prevention, Ministry of Natural Resources of People's Republic of China, Beijing 100081
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摘要 充分考虑振动台实验揭示出来的基本地震滑坡单元体震动滑移特征,总结得到其永久位移的估算方法:(1)考虑地震动惯性力和重力的联合作用,计算相应向上和向下滑移的屈服加速度,以反应其可能向上和向下滑移的行为;(2)在适度简化斜坡岩土体动力学模型的基础上,考虑斜坡岩土体自振特性和滑体所在高度对地震波的放大效应,得到滑体附近的局部地震加速度;(3)考虑滑体附近局部加速度和滑移屈服加速度的控制作用,计算每一地震波的周期内滑体相对滑床所能达到的最大滑移速度(向上和向下),进而得到相对动能;(4)考虑到滑体的动能基本耗散在滑带上,基于能量守恒原理,将相对动能除以滑带上的摩擦力,即可估算出每一周期内的永久位移;(5)将每一地震波周期内产生的永久位移相累加,即可得到总体的滑动位移。经与实验结果对比,本估算方法具有较高的精度与可靠性,虽只考虑了水平向地震动作用的影响,但对于存在竖向地震动的情况,其思路同样适用,只是需要计入竖向地震动惯性作用力的影响。
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钱海涛
肖锐铧
关键词基本地震滑坡单元   振动台实验   滑移特征   永久位移   估算方法     
Abstract: To fully consider the slid characters from shake table tests, we put forward an estimation method for the permanent displacement based on the basic earthquake landslide model. (1)we calculate the yield accelerations of slide downward and upward with considering the combined control effect of seismic and gravity, in order to show the behavior that the slide-body may slide downward and upward along the slide-belt. (2)We evaluate the local acceleration close to the slid-body because of the amplification effect of vibration characteristics of slope and height of the slide-body based on a simplified dynamic model of slope. (3)We calculate the maximum velocity of slide in every seismic wave period and then give the kinetic energy dissipated by sliding along the slide-belt with considering the control role of yield accelerations and local acceleration close to the slid-body. (4)We calculate the permanent displacement in per seismic wave period through the way that divide the kinetic energy by friction force based on the fact that the energy is dissipated by frictions at the slid-belt and the principle of conservation of energy. (5)Finally we get the overall permanent displacement by accumulating the permanent displacements in every seismic wave period. Through comparing the results from experiments and calculation, we have found that the method in this paper has high accuracy and reliability in estimating the permanent displacement. The idea of this article is adoptable to the present of vertical seismic by reckoning in vertical seismic inertial force though it comes from the scene that horizontal seismic present only.
Key wordsBasic earthquake landslide model   Shake table tests   Slid characters   Permanent displacements   Evaluation method   
收稿日期: 2017-09-12;
基金资助:国家自然科学基金青年基金(41202218,41602323)资助
作者简介: 钱海涛(1978-),男,博士,副研究员,主要从事地震地质灾害方面的研究工作.Email:haitao-qian@163.com
引用本文:   
钱海涛,肖锐铧. 充分考虑振动台实验滑移特征的地震滑坡基本单元体永久位移估算方法研究[J]. 工程地质学报, 2018, 26(6): 1585-1592.
QIAN Haitao,XIAO Ruihua. AN ESTIMATION METHOD FOR PERMANENT DISPLACEMENTS OF BASIC EARTHQUAKE LANDSLIDE MODEL WITH FULL CONSIDERATION OF SLID CHARACTERS FROM SHAKE TABLE TESTS[J]. Journal of Engineering Geology, 2018, 26(6): 1585-1592.
 
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