永州市零陵区切坡建房分布发育特征及简易治理方案OA

[Objective]With economic development and improved land-use efficiency,the practice of building houses on cut slopes in rural areas has become increasingly frequent.Improper construction on cut slopes triggers geological disaster risks,threatening the safety of villagers'lives and property.Therefore,it is necessary to conduct detailed research and risk assessment of house construction on cut slopes,and ultimately propose simple and feasible hazard management solutions.[Methods]Based on the 1∶10,000 geological hazard survey and risk assessment project in Lingling District,Yongzhou City,this study examined 3,233 house construction sites on cut slopes in Lingling District.Eight evaluation indicators were selected:soil and rock type(C1),cut slope height(C2),cut slope gradient(C3),distance between the house and the slope toe(C4),slope deformation characteristics(C5),retaining structures(C6),house structure(C7),and average monthly rainfall from April to August(C8).The Analytic Hierarchy Process(AHP)was used to construct a quantitative risk assessment system for evaluating the risks associated with house construction on cut slopes in Lingling District.[Results]The study identified 2 high-risk sites,798 medium-risk sites,and 2,433 low-risk sites for house construction on cut slopes.By analyzing the distribution patterns and developmental characteristics of these constructions,typical developmental patterns were summarized:high-risk sites correspond to cut slopes with a height≥9 m,gradient≥65°,and a slope toe distance≤1 m;medium-risk sites correspond to soil slopes with a cut slope height of 5-9 m,gradient of 60°-70°,and slope toe distance≤1 m;low-risk sites correspond to slopes with a cut slope height<5 m,gradient≤60°,and slope toe distance>1 m.Four failure modes were identified:sliding-type,tension-type,erosion-type,and composite-type.Targeted simple management solutions suitable for self-construction by villagers were proposed,including retaining walls,interception and drainage ditches,slope cutting and load reduction,and biological treatment.[Conclusions]The risk assessment system for house construction on cut slopes developed in this study is scientifically reliable and can be used for subsequent risk assessment calculations.The proposed simple management solutions for addressing hazards associated with house construction on cut slopes in Lingling District are economically reasonable and technically feasible.They can provide practical guidance for the prevention and control of geological disasters related to rural house construction on cut slopes in Hunan Province and serve as a reference for similar studies in other regions.