岸坡消落带岩体劣化的新生型滑坡(崩塌)隐患演化模式研究  

STUDY ON THE EVOLUTION MODEL OF NEOGENIC LANDSLIDE(COLLAPSE)HAZARDS IN ROCK MASS OF HYDRO-FLUCTUATION BELT

作　　者：张鹏[1,2] 张森林 黄波林[1,2] 王勋 郭健[1,2] 代贞伟[4] 郑嘉豪 闫国强[1,5] ZHANG Peng;ZHANG Senlin;HUANG Bolin;WANG Xun;GUO Jian;DAI Zhenwei;ZHENG Jiahao;YAN Guoqiang(Key Laboratory of Disaster Prevention and Mitigation of Hubei Province,Three Groges University,Yichang 443002,China;National Observatory of the Three Gorges Landslide,Yangtze River,Hubei Province,Yichang 443002,China;No.107 Team of Chongqing Geology Exploring Bureau,Chongqing 401120,China;Wuhan Centre of China Geological Survey,Wuhan 433000,China;Faculty of Engineering,China University of Geosciences,Wuhan 430074,China)

机构地区：[1]三峡大学防灾减灾湖北省重点实验室,宜昌443002 [2]三峡大学湖北长江三峡滑坡国家野外观测站,宜昌443002 [3]重庆市地质矿产勘查开发局107地质队,重庆401120 [4]中国地质调查局武汉地质调查中心,武汉433000 [5]中国地质大学(武汉)工程学院,武汉430074

出　　处：《工程地质学报》2021年第5期1416-1426,共11页Journal of Engineering Geology

基　　金：国家重点研发计划项目(资助号:2018YFC1504806);国家自然科学基金项目(资助号:41701013);开放基金项目(资助号:2018KTL13,2017KJZ05);重庆市技术创新与应用发展专项(资助号:cstc2019jscx-msxm X0318)。

摘　　要：三峡库区岸坡消落带是库岸边坡稳定性的敏感地带。库区内多次发生的地质灾害均与消落带的岩体劣化有关。随着时间的推移消落带的岩体劣化情况日益加剧,新生型滑坡不断涌现。本文通过实地调查与室内分析,系统总结了三峡库区秭归至巴东段岸坡消落带岩体劣化的类型以及新生型滑坡隐患的演化模式。研究表明,区内消落带岩性主要以碳酸盐岩类和碎屑岩类为主,碳酸盐岩类劣化类型主要有溶蚀(潜蚀)、裂缝显化与扩张和机械侵蚀,碎屑岩类的劣化类型主要有松动(剥落)、冲蚀(磨蚀)、结构面崩解块裂和软硬相间侵蚀,其中以松动/剥落型最为发育。在此基础上结合结构面发育特征、岸坡结构、岩性及结构和边界特征,厘定了不同岸坡消落带岩体劣化演化形成新生型滑坡隐患点的模式,碳酸岩盐类岸坡主要以基座碎裂压溃型、基座掏空倾倒型、顺向滑移型为主;碎屑岩类岸坡主要以软硬相间坍(崩)塌型、视倾向楔形滑动型、顺向滑移型及逆向倾倒型为主。研究结果可为三峡库区地质灾害监测预警及防治提供技术支撑。The Hydro-Fluctuation Belt of the Three Gorges Reservoir is a sensitive area for the stability of the reservoir bank slope.The geological disasters occurred many times in the reservoir area were related to the deterioration of the rock mass.With the passage of time,the deterioration of the rock mass in the Hydro-Fluctuation Belt is increasing,and new landslides continue to emerge.Based on field investigation and office analysis,We have summarized the types of rock mass deterioration and the evolution mode of new landslide hazards in the HydroFluctuation Belt from Zigui to Badong in the Three Gorges Reservoir Area.The results have shown that the lithology of the study area is mainly carbonate rock and clastic rock.The degradation types of carbonate rocks mainly include dissolution(subsurface erosion),fracture manifestation,expansion and mechanical erosion.The degradation types of clastic rocks mainly include loosening(spalling),erosion(abrasion),structural plane disintegration and block fracture,and soft-hard interphase erosion,Among them,the loose/flaking type is the most developed.Based on this binding surface development characteristics,slope structure,lithology and structural characteristics and the boundary,obtained the model of new landslide hazard point formed by rock mass degradation and evolution in different Hydro-Fluctuation Belt.Carbonate bank slopes are mainly characterized by base crushing,base hollowing and dumping,and forward slip.The clastic rock bank slopes are mainly dominated by soft-hard interphase collapse(collapse),apparent dip wedge sliding,forward sliding and reverse dumping.The research results can provide technical support for geological disasters monitoring in the Three Gorges Reservoir area.

关 键 词：三峡库区 岸坡消落带 岩体劣化 滑坡隐患点 演化模式 

分 类 号：P642.22[天文地球—工程地质学]