齐明柱. 2010: 深圳径肚滑坡群的性质及其成因. 工程地质学报, 18(S1): 346-352.
    引用本文: 齐明柱. 2010: 深圳径肚滑坡群的性质及其成因. 工程地质学报, 18(S1): 346-352.
    QI Mingzhu. 2010: THE PROPERTY AND FORMATION MECHANISM OF JINGDU LANDSLIDE GROUP IN SHENZHEN CITY. JOURNAL OF ENGINEERING GEOLOGY, 18(S1): 346-352.
    Citation: QI Mingzhu. 2010: THE PROPERTY AND FORMATION MECHANISM OF JINGDU LANDSLIDE GROUP IN SHENZHEN CITY. JOURNAL OF ENGINEERING GEOLOGY, 18(S1): 346-352.

    深圳径肚滑坡群的性质及其成因

    THE PROPERTY AND FORMATION MECHANISM OF JINGDU LANDSLIDE GROUP IN SHENZHEN CITY

    • 摘要: 径肚滑坡群由HP1和HP2两条滑坡组成,发育在低山前缘丘陵地带,滑坡场地揭示的地层主要为流纹质凝灰岩及其风化物。HP1滑坡属于既有滑坡的再次滑动,HP2滑坡系受HP1滑坡牵动形成。滑体主要由块碎石土、粉质黏土夹块碎石组成; 主滑段滑带主要由棕黄色、棕红色黏性土组成; 滑床为全风化流纹质凝灰岩。通过深入分析滑坡变形特征和工程地质条件,论证了径肚滑坡群的成因、性质,分析了大气降雨在滑坡生成过程中的作用。指出开挖坡脚使坡体失去支撑是滑坡复活的直接原因,长时间持续的强降雨是发生滑坡的诱发因素。在深圳等降雨量大的亚热带气候区,大气降雨和深层滑动之间没有必然联系,但久雨能够降低深层滑坡的动态稳定性,并促使滑坡发生。深圳地区广泛分布的凝灰岩风化物,在一定的含水条件下成为易滑地层。

       

      Abstract: JingDu landslide group,which consists of landslide HP1and landslide HP2,occurred in the hilly areas of low mountain front.The rhyolitic tuff and its weathered material are revealed mainly around the landslide field.Landslide HP1,as an existing landslide,slid again.At the same time,landslide HP2 was triggered by HP1.It is found that the sliding body is mostly composed of gravel soil and silty clay mixed with mass rock,the soil of sliding zone is mostly composed of plastic brown-yellow and brown-red cohesive clay,and the sliding bed is composed of completely decomposed thyolitic tuff.The property and mechanism of formation are also demonstrated for the JingDu landslide group through analyzing the characteristic of deformation and the engineering geology condition.Moreover,the effect of rainfall upon landslide is discussed.It is concluded that the excavation at the foot of the slope,which resulted in the failure of the brace on the foot of the slope,resulted in the development of the landslide group.The continuous and excessive rainfall is only the inducing factors.The occurrence of the deep-seated slide doesnt correlate necessarily with rainfall.However the continuous rainfall can reduce the dynamic stability of the deep-seated landslide and promotes the occurring of sliding.The weathered tuff,which distributed widely in Shenzhen area,can develop into sliding-prone stratum under the suitable hydrogeology condition.

       

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