中国铁道科学2023，Vol.44Issue(6)：13-24,12.DOI:10.3969/j.issn.1001-4632.2023.06.02
灰岩崩塌体斜坡动力响应与损伤识别
Dynamic Response and Damage Identification of Limestone Collapse Slope
摘要
Abstract
The stability of the limestone collapse slope is high in its natural state.However,strong earthquake would cause rock fissure expansion which will lead to slope failure.Generally,the dynamic response,failure mode,and energy transfer of limestone collapse slope under strong earthquakes could be investigated with large-scale shaking table model.Consequently,the results show that the failure process of limestone collapse slope under earthquake activity could be divided into four stages-the tensile crack of the slope shoulder joints and the shear displacement of the top bedding planes,the expansion of the vertical joint fissure and the increase of shear displacement,the formation of stepped sliding surface as well as the instability and collapse of the rock mass.All the stages satisfy the failure mode of tensile-shear-slip failure.In addition,the acceleration response of the slope indicates both the elevation amplification effect and the surface effect and the PGA amplification factor grows approximately linearly below 0.55 times the slope height while it grows more rapidly above 0.55 times the slope height.Besides,when the input seismic wave amplitude is less than 0.4 g,the PGA amplification coefficient increases with the increase of the input wave amplitude and decreases when the amplitude exceeds 0.4 g.The identification of the marginal spectrum shows that the slope failure starts from the shoulder and gradually shifts downward,and the damage on the slope surface is greater than that on the inside of the slope.Moreover,the sensitivity of the marginal spectrum is better than the PGA amplification coefficient during damage identification.关键词
崩塌体斜坡/地震/PGA放大系数/边际谱/振动台模型试验Key words
Collapse slope/Earthquake/PGA amplification coefficient/Marginal spectrum/Shaking table model test分类
交通工程引用本文复制引用
王通,刘先峰,袁胜洋,侯召旭,闵琦,张俊,胡金山..灰岩崩塌体斜坡动力响应与损伤识别[J].中国铁道科学,2023,44(6):13-24,12.基金项目
国家自然科学基金资助项目(52078432,52168066) （52078432,52168066）
中铁第一勘察设计院集团有限公司科研项目(院科20-06) （院科20-06）
