薄厚岩组合型斜坡动力响应与破坏机制的振动台模型试验研究

doi:10.13722/j.cnki.jrme.2022.0021

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摘要以青藏高原金沙江流域雪隆囊地区贡扎滑坡滑前斜坡为原型，设计并完成薄厚岩组合型反倾岩体斜坡振动台模型试验，研究薄厚岩组合型反倾岩体斜坡的动力响应和破坏机制。试验结果表明，在斜坡1/2坡高以上PGA放大系数增大明显；在斜坡不同高程处，由坡内到坡表，PGA放大系数变化规律不同；在斜坡高陡区PGA放大系数增大，在斜坡坡脚处PGA放大系数减小。输入地震波的频率、幅值和时间压缩比均会对斜坡动力响应产生比较大的影响。当输入波幅值比较大时，高频波激励下斜坡PGA放大系数显著增大；当输入波频率小于斜坡自振频率时，随输入波频率增加，PGA放大系数增大，超过斜坡自振频率后，坡表PGA放大系数减小，坡内PGA放大系数先减小后增大。输入波幅值对斜坡动力响应的影响与输入波类型有关，不同类型输入波激励下斜坡动力响应规律不同。不同倍数时间压缩比下，斜坡动力响应有较大变化。综合分析斜坡动力响应和高速摄像机拍照记录，坡表高陡区PGA放大系数最大，坡内PGA放大系数沿高程变化规律基本遵循高程效应。斜坡自振频率在0.2 g幅值输入波激励时下降显著，此时斜坡结构在地震作用下发生变化。斜坡破坏模式为：高陡区上部坡肩出现裂缝→裂缝区向下扩展→高陡区右上侧出现局部失稳破坏→失稳区扩大为整个高陡区域→高陡区岩体由上到下被震落同时伴随着部分下部薄岩块被震落，破坏过程中伴随着斜坡下半段轻微隆起。该试验揭示了薄厚岩组合型反倾岩体斜坡在地震作用下的动力响应规律和破坏机制，为此类斜坡的防治提供了依据。

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	郭明珠
	王晨
	谷坤生
	王志颖

关键词 ：岩石力学, 薄厚岩组合型斜坡, 振动台试验, 动力响应, 破坏机制, 反倾岩体斜坡

Abstract：A shaking table model test was designed and completed to study the dynamic response and damage mechanism of counter-bedding slopes with thin and thick rock combination，taking the pre-slide slope of the “Gongzha” landslide in the Xuelongnang area of the Jinsha River basin on the Qinghai—Tibet Plateau as a prototype. The test results show that the PGA amplification coefficient increases significantly above 1/2 slope height of the slope，that the PGA amplification coefficient changes differently from inside to surface at different elevations of the slope，and that the PGA amplification coefficient increases in the high-steep area but decreases at the foot of the slope. The input seismic wave frequency，amplitude and time compression ratio all have a relatively large effect on the slope dynamic response. When the input wave amplitude is relatively large，the PGA amplification coefficient increases significantly under high-frequency wave excitation. When the input wave frequency is less than the slope natural frequency，the PGA amplification coefficient increases with increasing the input wave frequency，and after exceeding the slope natural frequency，the PGA amplification coefficient decreases at the surface while decreases first and then increases at the inside of the slope with the input wave frequency. The effect of input wave amplitude on the slope dynamic response is related to the type of input wave，and the slope dynamic response law is different under different types of input wave excitation. Comprehensive analysis of the slope dynamic response and high-speed camera photo records indicates that the PGA amplification coefficient in the high-steep area of the slope surface is the largest while that the variation law of PGA amplification coefficient along the elevation inside the slope basically follows the elevation effect. The natural frequency of the slope drops significantly at 0.2 g amplitude seismic wave excitation，and at this time the slope structure changes under seismic action. The damage mode is：cracks initiating in the upper shoulder of the high-steep area→the crack area expanding downward→local instability of the upper right side of the high-steep area→the instability zone expanding to the whole high-steep area→the rock in the high-steep area being shaken down from top to bottom along with part of the lower thin rock block，and the damage process is accompanied by a slight uplift of the lower part of the slope. The test reveals the dynamic response law and damage mechanism of counter-bedding slope with thin and thick rock combination under the action of earthquake，which provides a basis for the prevention and control of such slopes.

Key words： rock mechanics thin and thick rock combinational slope shaking table tests dynamic response failure mechanism counter-bedding rock slope

引用本文:

郭明珠，王晨，谷坤生，王志颖. 薄厚岩组合型斜坡动力响应与破坏机制的振动台模型试验研究[J]. 岩石力学与工程学报, 2022, 41(11): 2173-2185.
GUO Mingzhu，WANG Chen，GU Kunsheng，WANG Zhiying. Shake table model test study on dynamic response and damage mechanism of slopes with thin and thick rock combination. , 2022, 41(11): 2173-2185.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0021 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I11/2173

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