Characteristics of discontinuities in Heifangtai landslide area in Gansu,China  

中国甘肃黑方台滑坡区结构面发育特征

作　　者：Li Bin Xu Qiang Cheng Qiang Liu Tian-Xiang Tang Ming-Gao Zheng Guang Wang Hai-Yan 李斌;许强;程强;刘天翔;汤明高;郑光;汪海燕(成都理工大学地质灾害防护与地质环境保护国家重点实验室,四川成都610059;四川省公路规划勘察设计研究院有限公司,四川成都610041)

机构地区：[1]Chengdu University of Technology,State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Sichuan,Chengdu 610059,China [2]Sichuan Highway Planning,Survey,Design and Research Institute Ltd.,Sichuan,Chengdu 610041,China

出　　处：《Applied Geophysics》2020年第5期857-869,904,905,共15页应用地球物理（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(41630640);the National Science Foundation of Innovation Research Group(41521002);the National Natural Science Foundation of China(41790445);the National K&D Program(2018YFC1504901,2018YFC1504904).

摘　　要：Loesses are widely distributed all over the world,especially in China.Meanwhile,long-term agricultural irrigation and extreme climate changes have led to frequent geological disasters in the Heifangtai area of Lanzhou,Gansu,China.Of these,landslides are one of the most frequent types of disasters that are harmful to humans and the environment.A landslide is closely related to the lithology,structure,and groundwater of the site and consists of a combination of structure units divided by discontinuities,such as faults,joints,and fi ssures.Therefore,geological surveys,engineering drilling,and trenching are typically used to identify the stratum lithology,structure,and groundwater in order to visually display underground information within a limited depth range.However,these methods have disadvantages.In particular,geological surveys can only describe geological phenomena on the surface,while the cost of drilling and trenching may be high,along with the ineffi ciency of exploration.In this research,the integrated geophysical exploration method was used to analyze the hidden joints,cracks,and other discontinuities and geophysical features of the discontinuities.The results were verified by trench exploration,and large amounts of underground information were obtained,especially the spread and distribution of discontinuities in landslide areas.Such information can be effectively used for carrying out and providing meaningful experiences and lessons in future comprehensive geophysical processing and interpretations related to the prediction and evaluation of landslides.黄土在全世界特别是中国广泛分布,经长期的农业灌溉和极端气候的变化,导致中国甘肃兰州黑方台地区地质灾害频发,而滑坡是其中最为频发的一种类型,它对人的生命安全和环境造成极大的伤害。滑坡与场地地层岩性、结构、地下水三者密切相关,结构是被断层,节理,裂隙等结构面分割的结构体的组合形式。因此,地质调查,工程钻探及槽探通常用于识别地层岩性、结构及地下水,以直观地显示有限深度范围内的地下信息;缺点是地质调查仅能描述地表的地质现象,而钻探和槽探的成本高和效率低。在这项研究中,综合地球物理勘探方法被用来分析隐蔽的节理、裂隙等结构面地球物理特征及发育特征,经现场试验及槽探验证了其反演解释成果,故可有效获取大量地下信息以进行预测评价滑坡,为以后的综合物探处理解释提供有意义的经验和参考。

关 键 词：LOESS LANDSLIDE DISCONTINUITIES GEOPHYSICS engineering geology 

分 类 号：P642.22[天文地球—工程地质学] P631.33[天文地球—地质矿产勘探]