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云南小江断裂东支活动性分析及工程场地稳定性评价

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小江断裂延伸长、次生断裂交错分布多,使得区域内重大工程难以避免活动断裂带的影响,因此活动断裂的活动强弱以及场地稳定性是区域重大工程建设面临的主要工程稳定性问题.为了查清活动断裂对公路工程场地的影响,笔者等基于小江断裂地质构造背景,充分利用既有研究成果资料,重点研究区域构造环境和断裂特征,通过地质调绘、物理探测、年代学测试,结合对前人资料的系统梳理,计算分析了小江断裂中段东支活动速率,初步判定断裂活动程度;并综合考虑断裂活动性、地震烈度、岩体特性等因素,对工程场地稳定性进行分级.结果表明,小江断裂东支平均水平位移速率为6.6 mm/a,判定为强活动断裂,区域工程场地稳定性划分为极不稳定区;认为强烈活动性断裂两侧各10 km区域内对工程的影响最为严重,为公路工程场地选址和抗震设计提供了理论和数据支持.
Activity analysis and site stability evaluation of the eastern branch of the Xiaojiang fault in Yunnan
Objectives:The long extension of the Xiaojiang fault and its staggered distribution of secondary faults make it difficult for major projects in the region to avoid the impact of active fault zones,therefore,the activity of active faults and site stability are the main engineering stability problems faced by regional major engineering construction.It is of great significance for engineering geological research and disaster prevention and reduction.Methods:In order to find out the effect of active fault on the highway engineering site,based on the geological and tectonic background of the Xiaojiang fault,this paper makes full use of the existing research results,focuses on the regional tectonic environment and fault characteristics,calculates and analyzes the activity rate of the eastern branch of the Xiaojiang fault and determines the degree of fault activity through geological mapping,physical exploration and combined with chronological testing;Taking into account factors such as fault activity,seismic intensity,and rock mass characteristics,the stability of the regional site has been graded.Results:The results show that the average horizontal displacement rate of the Xiaojiang fault is 6.6 mm/a,which is considered as a strong active fault and the stability of the regional engineering site is divided into extremely unstable regions.Conclusions:It is concluded that the impact on the project was most serious in the 10 km area on both sides of the highly active fault,which provides theoretical and data support for site selection and seismic design of highway engineering.

highway engineeringXiaojiang active faultsliding ratethe intensity of fracture activitysite stability

王迎法、曲亚明、牟儒、赵鑫、许汉华、吴中海

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云南省交通规划设计研究院有限公司,云南省数字交通重点实验室,昆明,650041

云南大学国际河流与生态安全研究院,昆明,650500

中国有色金属工业昆明勘察设计研究院有限公司,云南省岩土工程与地质灾害重点实验室,昆明,610059

自然资源部活动构造与地质安全重点实验室,中国地质科学院地质力学研究所,北京,100081

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公路工程 小江活动断裂 滑动速率 断裂活动强度 场地稳定性

云南省中青年学术和技术带头人后备人才项目交通运输部2021年度交通运输行业重点科技项目清单项目云南省交通投资建设集团有限公司科技创新计划项目云南省数字交通重点实验室项目

202305AC1600712021-MS4-105YCIC-YF-2022-07202205AG070008

2024

10.16509/j.georeview.2023.08.041

地质论评
中国地质学会

地质论评

CSTPCD北大核心
影响因子：1.842
ISSN：0371-5736
年,卷(期)：2024.70(1)
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