隧道口顺层斜坡地震动力响应特征振动台试验  

Seismic Dynamic Response Characteristics of a Layered Slope at Tunnel Entrance Using Shaking Table Test

作　　者：陈志荣 宋丹青 刘晓丽[2] 王诚文 张建伟[3] Chen Zhirong;Song Danqing;Liu Xiaoli;Wang Chengwen;Zhang Jianwei(Institute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Sciences,Shijiazhuang 050061,China;State Key Laboratory of Hydroscience and Hydropower Engineering,Tsinghua University,Beijing 100091,China;School of Civil Engineering and Architecture,Henan University,Kaifeng 475001,China)

机构地区：[1]中国地质科学院水文地质环境地质研究所,河北石家庄050061 [2]清华大学水沙科学与水利水电工程国家重点实验室,北京100091 [3]河南大学土木建筑学院,河南开封475001

出　　处：《地球科学》2022年第6期2069-2080,共12页Earth Science

基　　金：国家自然科学基金项目(Nos.41941019,52109125);国家重点研发计划项目(No.2021YFB2301201);中国博士后科学基金(No.2020M680583);博士后创新人才支持计划(No.BX20200191);清华大学“水木学者”计划(No.2019SM058)。

摘　　要：为研究地震作用下隧道洞口段顺层边坡的动力响应特征及动力破坏模式,基于动力模型试验的相似关系,设计完成了隧道洞口段顺层边坡振动台缩尺模型试验.试验结果表明,地震作用下模型边坡具有典型的地形放大效应,模型边坡具有明显的坡表动力放大效应,相同条件下与坡内相比坡表的动力放大效应较大;地震动输入方向及强度对模型边坡的动力响应特征具有影响,相同条件下与输入垂直地震动相比输入水平地震动时模型边坡的动力放大效应较大;隧道结构改变了模型边坡的局部动力响应特征,对坡体的动力放大效应具有放大作用;地震作用下模型边坡的动力破坏模式为地震诱发-最上层结构面逐渐形成滑带-最上层结构面以上滑体滑动破坏-滑体堆积坡脚.To study the dynamic response characteristics and dynamic failure modes of the bedding slope at the tunnel entrance under earthquakes,a shaking table scaled model test of the bedding slope at the tunnel entrance was designed based on the similarity relationship of the dynamic model tests.The experimental results show that the model slope has typical topographic amplification effect under seismic action.The model slope has obvious dynamic amplification effect of slope surface,and the dynamic amplification effect on the slope surface is larger than that in the slope under the same conditions.The input direction and strength of ground motion have influence on the dynamic response characteristics of the model slope.Compared with the input of vertical ground motion,the dynamic amplification effect of the model slope is larger when the input of horizontal ground motion under the same conditions.The tunnel structure changes the local dynamic response characteristics of the model slope and has a magnifying effect on the dynamic amplification effect of the slope.The dynamic failure mode of the model slope under earthquake action is as follows:earthquake induced-slip zone gradually formed on the topmost structural plane-slip failure above the topmost structural plane-slip body accumulation at the foot of slope.

关 键 词：隧道洞口段 层状边坡 动力响应特征 地震 振动台试验 岩土工程 

分 类 号：P315[天文地球—地震学] P642[天文地球—固体地球物理学]