广东佛冈县龙山镇鹤田村崩塌体特征及稳定性分析  

Characteristics and Stability Analysis of Collapse Body in Hetian Village,Longshan Town,Fogang County,Guangdong Province

作　　者：李玲 LI Ling(Nuclear Industry Geological Survey Institute of Guangdong,Guangzhou 510800,Guangdong,China)

机构地区：[1]广东省核工业地质调查院,广东广州510800

出　　处：《华南地质》2024年第3期583-591,共9页South China Geology

基　　金：广东省国土资源厅和广东省财政厅项目(441821-201809-01400-0008)。

摘　　要：佛冈县处于广东三大暴雨中心之一的粤北地区,区内强降雨诱发的崩塌地质灾害极为发育。本文采用野外调查、赤平极射投影法结合高密度电法和地震面波法查明了佛冈县龙山镇鹤田村崩塌地质特征、形成原因及其稳定性,以指导区内同类地质灾害防治工作。通过地貌特征分析,认为鹤田村崩塌体堆于斜坡上,斜坡体高陡,地质环境极为不利,稳定性不佳;应用高密度电法和地震面波法探测崩塌体,发现其表层部分已发生崩塌,形成松散层,孔隙率较大,遇水软化,稳定性变差,极易产生崩塌;综合分析崩塌体形成机理,进行稳定性分析,并得出以下结论:(1)削坡建房是崩塌产生的主导因素;(2)边坡岩土体特征是崩塌形成的内在因素;(3)降雨是崩塌地质灾害形成的直接诱发因素;(4)崩塌体仍处于不稳定状态,潜在危险性大;(5)建议对该坡体进行削方减载、地表排水、修建挡土墙,对坡面进行防护、稳固,同时加强监测。Fogang County,Guangdong Province is located in the northern part of Guangdong Province,one of the three heavy rainstorm centers in Guangdong Province.Collapse geological disasters induced by heavy rainfall are extremely developed in the area.To guide the prevention and control of similar geological disasters in the area,this study has carried out field investigations and the red plane polar projection method,combined with the high-density electrical method and seismic surface wave method to investigate the geological characteristics,causes,and stability of the collapse in Hetian Village,Longshan Town,Fogang County.Through analyzing the geological and environmental characteristics of the collapse body based on its terrain and landforms,the collapse body should have been piled up on the slope surface,with a high and steep slope,as well as an extremely unfavorable geological environment.The high-density electrical and seismic surface wave methods showthe characteristics of the collapse body interpreted through geophysical exploration.The surface part of the collapse body has already started collapsing,forming a loose layer with a high porosity and deteriorating stability,meanwhile softened by water,making it prone to collapse.A comprehensive analysis of the mechanism of collapse formation and conduct stability has been conducted.The following conclusions are drawn:(1)Slope-cutting for building houses is the dominant factor in the occurrence of collapse;(2)The characteristics of the rock and soil mass on the slope are inherent to collapse formation;(3)Rainfall is a direct trigger for the geological hazards;(4)The collapse body is still in an unstable state with serious potential danger;(5)It is recommended that the slope be protected and stabilized by chipping and load shedding,surface drainage,and construction of retaining walls,as well as increased monitoring.

关 键 词：地质灾害 崩塌 高密度电法 地震面波法 佛冈县 

分 类 号：P642.21[天文地球—工程地质学]