摘要
为研究地震作用下地裂缝场地的破坏特征和损伤变化规律,以西安f4地裂缝场地为背景,进行振动台模型试验。基于希尔伯特边际谱理论,通过土体内部实测数据对地裂缝场地损伤过程进行分析。结果表明:(1)地震作用下,地裂缝场地上、下盘土体变形不一致导致主裂缝两侧产生张拉应力,使得主裂缝不断开裂、扩展,破裂面为锯齿状,且上盘区域产生的次生裂缝更多;(2)损伤指数的发展规律与试验现象较为吻合,说明此损伤量化方法适用于评价地裂缝场地在地震作用下的损伤特征;(3)地表各测点的损伤指数和峰值加速度分布规律表现出较高的一致性,均在靠近地裂缝处达到最大,随着与地裂缝距离的增大而递减,表现出“上、下盘效应”,土体的损伤状况与输入峰值加速度、土层类别等因素有关。
To investigate the damage characteristics and change laws of ground fissures sites under earthquakes,the shaking table model test on soil was designed and completed,based on the ground fissures site of f4 in Xi'an.The damage process of the ground fissures site was analyzed by the mea‐sured data in soil,based on the Hilbert margin spectrum.The results showed that:(1)The inconsis‐tent deformation of the hanging-wall and footwall of the ground fissures site leads to tensile stress on both sides of the main fissure.Thus,the main fissure gradually cracked and expanded,and the crack surface was in a sawtooth shape.The number of secondary fissures was more than that on the foot‐wall.(2)The development law of damage index was consistent with the experimental phenomenon,indicating that the damage quantification method was suitable for detecting the damage development of ground fissures sites under earthquakes.(3)Distribution laws of damage index and peak acceleration on the surface were highly consistent.All parameters reached the maximal value at the fissure,and the peak value gradually decreased from the main fissure to the two sides,showing“hanging-wall/foot‐wall effect”.The damage state of soil was related to the input peak acceleration,soil type and other factors.
作者
张朝
康佳旺
熊仲明
裘潇钰
黄正东
ZHANG Chao;KANG Jiawang;XIONG Zhongming;QIU Xiaoyu;HUANG Zhengdong(School of Civil Engineering,Inner Mongolia University of Science&Technology,Baotou 014010,China;Academician Expert Workstation of Mine Safety and Underground Engineering,Inner Mongolia University Science and Technology,Baotou 014010,China;School of Civil Engineering,Xi'an University of Architecture&Technol‐ogy,Xi'an 710055,China)
出处
《防灾减灾工程学报》
CSCD
北大核心
2023年第2期395-404,共10页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家自然科学基金项目(51278399)
住房与城市建设部自然基金资助项目(2019-k-044)
陕西省自然科学基础研究计划重点项目(2018JZ5008)
内蒙古自治区自然科学基金(2021BS05013)资助。
关键词
地裂缝场地
振动台试验
破坏特征
损伤指标
ground fissures site
shaking table test
failure characteristics
the damage index
