2016: 超孔隙水压诱发特大型近水平崩坡积层滑坡破坏研究. 工程地质学报, 24(5): 732-740. DOI: 10.13544/j.cnki.jeg.2016.05.002
    引用本文: 2016: 超孔隙水压诱发特大型近水平崩坡积层滑坡破坏研究. 工程地质学报, 24(5): 732-740. DOI: 10.13544/j.cnki.jeg.2016.05.002
    2016: FAILURE OF SUPER-HUGE LANDSLIDE IN COLLAPSED DEBRIS DEPOSITS WITH NEARLY HORIZONTAL SLIDING SURFACE INDUCED BY EXCESS PORE WATER PRESSURE. JOURNAL OF ENGINEERING GEOLOGY, 24(5): 732-740. DOI: 10.13544/j.cnki.jeg.2016.05.002
    Citation: 2016: FAILURE OF SUPER-HUGE LANDSLIDE IN COLLAPSED DEBRIS DEPOSITS WITH NEARLY HORIZONTAL SLIDING SURFACE INDUCED BY EXCESS PORE WATER PRESSURE. JOURNAL OF ENGINEERING GEOLOGY, 24(5): 732-740. DOI: 10.13544/j.cnki.jeg.2016.05.002

    超孔隙水压诱发特大型近水平崩坡积层滑坡破坏研究

    FAILURE OF SUPER-HUGE LANDSLIDE IN COLLAPSED DEBRIS DEPOSITS WITH NEARLY HORIZONTAL SLIDING SURFACE INDUCED BY EXCESS PORE WATER PRESSURE

    • 摘要: 特大型近水平崩坡积层滑坡广泛发育于三峡库区重庆段万州城区及云阳地区。基于万州城区太白岩古滑坡以及云阳地区老药铺滑坡两个典型特大型近水平崩坡积层滑坡,分析了其结构特征及破坏特点;建立了强降雨作用下特大型近水平崩坡积层滑坡破坏的力学模型,解译了此类滑坡的破坏过程,并提出了滑带(面)超孔隙水压力是此类滑坡破坏的诱因。基于孔隙水压力与土体所处的应力状态的内在关系,推导了滑面处每个土条的孔隙水压力及水压力公式,并得出了考虑超孔隙水压力的滑坡稳定系数表达式。云阳地区老药铺滑坡算例表明,若将老药铺滑坡按zk5分为两个滑坡,两个滑坡的中心段是孔隙水压力值较高的区域;本文的孔隙水压力计算值略大于钻孔量测值,计算误差为5.8%~10%,原因在于滑面超孔隙水压力的消散;暴雨工况(含超孔隙水压力)下老药铺滑坡稳定系数为0.862,滑坡处于非稳定状态,并已发生破坏,验证了超孔隙水压力对滑坡体破坏的诱发作用;建议滑坡治理工程中应在按zk5分成的两个滑坡中间段打设排水孔,消除或降低滑面处的超孔隙水压力值,并结合滑坡周围及坡面的截排水工程以及封填裂隙治理老药铺滑坡。

       

      Abstract: Super-huge landslides in collapsed debris deposits with nearly horizontal sliding surface widely develop in Wanzhou District and Yunyang District, Chongqing Municipality in the Three Gorges Reservoir Region. Based on the two typical landslides, Taibaiyan Ancient Landslide in Wanzhou District and Laoyaopu Landslide in Yunyang District, this paper analyzes their structures and failure characteristics, and establishes a mechanical model of failure for super-huge deposit landslides with nearly horizontal sliding surface under the condition of heavy rainfall. This paper explains the failure process for this kind of landslide. Therefore, the excess pore water pressure produced in sliding band(or sliding surface) is the cause of this kind of landslide failure. Taking into account of the internal relation of pore water pressure and soil stress state, this paper deduces expressions of pore water pressure and hydraulic pressure of each soil slip in sliding surface, and obtains landslide stability coefficient expression considering the pore water pressure. The case of Laoyaopu Landslide in Yunyang District indicates the follows. Laoyaopu Landslide can be divided into two landslides by the location of zk5. The higher pore water pressure is located in the center of two landslides. The value of the pore water pressure calculated by this paper is bigger than the measure value in borehole. Its calculation error is 5.8%~10%. The cause can be the dissipated pore water pressure. The stability coefficient of Laoyaopu Landslide was 0.862 under the condition of heavy rainfall(i.e. the condition of excess pore water pressure). This landslide was unstable and has failed, which verified the induced action of the pore water pressure to landslide failure. This paper suggests that drain hole should be hit in the center of two landslides divided by zk5 in landslide project of management, which can eliminate or decrease the pore water pressure in the sliding surface. Besides Laoyaopu Landslide is governed with interception and drain engineering around landslide and in landslide surface, filling cracks.

       

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