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陇中盆地水震耦合作用下黄土-泥岩接触面滑坡液化-滑移机制及危险性定量评价研究
结题报告
批准号:
41972301
项目类别:
面上项目
资助金额:
65.0 万元
负责人:
梁昌玉
学科分类:
工程地质学
结题年份:
2023
批准年份:
2019
项目状态:
已结题
项目参与者:
梁昌玉
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中文摘要
针对陇中盆地广泛存在的黄土-泥岩接触面滑坡灾害,选取典型的液化-长距离滑移型地震滑坡为代表,在滑坡原型案例研究的基础上,从地形地貌特殊性、斜坡结构特殊性、岩土体结构特殊性、地下水赋存特殊性等几个方面揭示此类滑坡的孕灾环境,提出地质模式。考虑地震、降雨和地下水综合作用下液化-长距离滑移型黄土-泥岩接触面滑坡特殊性,通过细微观测试、微米CT原位三轴试验、室内动力学实验、大型离心机振动台试验以及数值仿真技术等有机结合,开展水震耦合条件下黄土-泥岩接触面滑坡变形失稳特征及成因机制研究,探索黄土-泥岩接触面滑坡液化-远距离滑移的宏细观动因,揭示水震耦合条件下滑坡液化的启动机制、长距离滑移机制,确定斜坡失稳临界位移,为陇中盆地及其相似地区的地震危险性定量评价奠定基础,为水震耦合条件下液化-滑移型滑坡灾害的早期识别和预警提供理论依据,为抗震设计和精准减灾防灾提供科学技术支撑.
英文摘要
Loess-mudstone interface landslides develop widely in longzhong basin, typical liquefaction-slip earthquake landslides were selected. Based on the study of the landslide prototype, the background of such landslides was revealed from the landform particularity, slope structure particularity, rock mass structure particularity, groundwater environment particularity, and geological model is put forward. Considering the particularity of loess-mudstone interface landslides characterized by liquefaction and long-distance slip under the coupling action of earthquake, rainfall and underground water, micrometer CT in-situ triaxial tests, mesoscopic & microscopic tests, indoor dynamic tests, numerical simulation experiments and shaking table tests of large leotechnical centrifuge is combined. The deformation and failure characteristic of loess-mudstone interface landslide under the coupling action of water and earthquake is studied. The macro-mesoscopic dynamic factors of loess-mudstone interface landslides characterized by liquefaction and long-distance slip are explored, the start mechanism and the long slip mechnism under the coupling action of water and earthquake are revealed and the critical displacement of slope instability is determined. It will lay a foundation for quantitative evaluation of seismic risk in longzhong basin and the similar areas, provied a theoretical basis for the early identification and early warning of liquefaction-slip landslide disaster under the coupling action of water and earthquake, and provide scientific and technical support for seismic design and accurate disaster reduction and prevention.
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DOI:10.1007/s12665-022-10489-4
发表时间:2022-08-01
期刊:ENVIRONMENTAL EARTH SCIENCES
影响因子:2.8
作者:Liang, Changyu;Zhang, Hui;Wang, Tao
通讯作者:Wang, Tao
DOI:10.16031/j.cnki.issn.1003-8035.202112027
发表时间:2023
期刊:中国地质灾害与防治学报
影响因子:--
作者:赵建磊;王涛;梁昌玉;张泽林;刘甲美;王浩杰;辛鹏
通讯作者:辛鹏
黄土—泥岩接触面黏土矿物富集机制及其控制下的接触面泥流型滑坡启滑机理研究
地震纵波作用下节理岩体宏观动力响应及其细观机制研究
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海外基金