Relationship between rain and/or meltwater, pore-water pressure and displacement of a reactivated landslide
Relationship between rain and/or meltwater, pore-water pressure and displacement of a reactivated landslide
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DOI：
10.1016/j.enggeo.2008.03.007
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发表时间：
2008-09
影响因子：
7.4
通讯作者：
S. Matsuura;S. Asano;T. Okamoto
中科院分区：
文献类型：
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作者：
S. Matsuura;S. Asano;T. Okamoto
为了阐明降雨和/或融水（MR），孔隙水压力和滑坡位移之间的关系，进行了连续监测，在一个复活的滑坡主要包括第三纪风化泥岩的年龄。在每一个事件的MR总量和孔隙水压力增量与时间积分（孔隙水压力脉冲）的数量之间的指数关系。此外，随着总MR的增大，各事件的孔隙水压力最小值与最大值之差（孔隙水压力波动幅度）也增大，但MR强度对孔隙水压力波动幅度影响不大。孔隙水压力波动幅度与滑坡累积位移、孔隙水压力冲量与滑坡累积位移的相关系数相近，但均在0.57 ~ 0.66之间。另一方面，总MR和累积滑坡位移的相关系数较大（0.65-0.69）。累积滑坡位移是非常高度相关的有效MR（这表明估计的地下水含量）的半衰期为4天，相关系数为0.89-0.92。因此，该滑坡的位移特征可以用含水量的水文因子来解释，而不能用孔隙水压力的水力特性来解释。
In order to clarify the relationship between rain and/or meltwater (MR), pore-water pressure and landslide displacement, continuous monitorings were conducted at a reactivated landslide comprised mainly of weathered mudstone of Tertiary in age. An exponential relationship was found between the total amount of MR at each event and the amount of pore-water pressure increment integrated by time (impulse of pore-water pressure). In addition, as the total MR increased, the difference between the minimum and maximum values of pore-water pressure for each event (fluctuation range of pore-water pressure) also increased, but the intensity of MR had little effect on the fluctuation range of pore-water pressure. The correlation coefficient for the fluctuation range of pore-water pressure and cumulative landslide displacement, and that for the impulse of pore-water pressure and cumulative displacement were similar, but were only 0.57 to 0.66. On the other hand, the correlation coefficient for the total MR and cumulative landslide displacement was large (0.65–0.69). Cumulative landslide displacement was very highly correlated with effective MR (which shows the estimated water content in the ground) for a half-life period of 4 days, and correlation coefficients were 0.89–0.92. Thus, the displacement characteristics of this reactivated landslide which has a long history of landsliding can be explained using the hydrological factor of water content rather than the hydraulic characteristics of pore-water pressure.