摘要
地裂缝作为非连续地质界面对场地动力响应的影响是显而易见的,对不同缝面形态地裂缝场地进行地震响应规律研究是进行地裂缝场地建筑物抗震设防的基础。为此以西安典型地裂缝为研究背景,进行了单缝型地裂缝场地动力响应振动台模型试验,获得了地裂缝场地动力响应规律及响应特征;在此基础上通过MIDAS数值软件对西安单缝型、“y”字型、正“八”型和倒“八”型地裂缝,以及苏锡常地区基岩潜山型和基岩陡崖型6种缝面形态地裂缝场地地震响应规律进行了研究。结果表明:单缝型地裂缝呈现出越靠近地裂缝峰值加速度越大,随着距地裂缝距离越来越远,峰值加速度逐渐减小后趋于稳定的响应规律;“y”字型、正“八”型和倒“八”型地裂缝具有明显的“双峰”特征,即地表峰值加速度在靠近主、次地裂缝处都有明显的增大;基岩潜山型地裂缝场地地震响应规律与西安地区正“八”型地裂缝场地相似具有“双峰”特征,随着距主、次地裂缝距离增加地表峰值加速度逐渐减小后趋于稳定;基岩陡崖型地裂缝场地与西安地区单缝形地裂缝场地地震响应规律相似,但在地裂缝处场地地表峰值加速度响应更加明显,地表峰值加速度曲线更加陡峭。
The influence of ground fissures as a discontinuous geological interface on the dynamic response of the site is obvious,and the seismic response law of ground fissure sites with different fracture surface forms is the basis for seismic fortification of buildings on ground fissure sites.Therefore,based on the Xi'an typical ground fissures,a single-fracture ground fissure site dynamic response shaking table model test was carried out,and the dynamic response law and response characteristics of the ground fissure site were obtained.Based on the numerical software MIDAS,the seismic response law of ground fissure sites has been studied,such as the shape of ground fissures are"y","splayed"and"fall splayed".The seismic response law of the bedrock buried hill type and bedrock cliff type in the Suzhou,Wuxi,and Changzhou areas has also been studied.The research results show that in the condition of the single-fracture ground fissures,the peak acceleration is larger as the distance from the ground fissure gets closer,and the peak acceleration gradually decreases as the distance from the ground fissure becomes more and more stable;splayed-shaped and fall-splayed-shaped ground fissures have obvious"double peaks"characteristics,i.e.,the peak acceleration of the surface increases significantly near the primary and secondary ground fissures;the seismic response law of the bedrock buriedhill ground fissure site similar to the splayed-shaped ground fissure site in Xi'an area,it has the characteristics of"double peaks".As the distance between the primary and secondary ground fissures increases,the peak surface acceleration gradually decreases and then stabilizes;the seismic response law of the bedrock cliff-type ground fissure site is similar to the ground fissure site in Xi'an area.But the peak acceleration response of the site surface at the ground fissures is more obvious,and the peak surface acceleration curve is steeper.
作者
慕焕东
邓亚虹
纪帆
宣友
白逸松
MU Huandong;DENG Yahong;JI Fan;XUAN You;BAI Yisong(Institute of Geotechnical Engineering,Xi'an University of Technology,Xi'an 710048,China;Department of geology Engineering,Chang'an University,Xi'an 710054,China;China Railway First Bureau Group Fourth Engineering Co.,Ltd.,Xianyang 712000,China)
出处
《防灾减灾工程学报》
CSCD
北大核心
2022年第3期425-435,共11页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家自然科学基金(41772275)
陕西省教育厅科学研究计划专项项目(20JK0801)
陕西省自然科学基础研究计划一般项目(2022JQ-289)
陕西省重点研发计划项目(2022SF-197)资助。
关键词
缝面形态
地裂缝
地震响应
振动台试验
数值模拟
suture surface morphology
ground fissure
seismic response
shaking table model test
numerical simulation
