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滑坡的变形破坏过程和所造成的不良地质环境问题对人类工程活动带来十分严重的危害,并且还可能引起生态环境的失调和破坏,造成更为深远的影响。对三峡库区滑坡研究发现,随着库水位的动态变化滑坡的稳定性并非出现单调的变化趋势,而是在这个过程中达到稳定性系数极小的状态。然而,对这个极小稳定性状态的形成及特征还缺少论述。本文基于滑坡地下水运动模型和稳定性评价的极限平衡模型对库水位升降条件下滑坡稳定性极小状态的形成机理和影响因素进行研究。结果表明,滑坡稳定性极小状态的形成时间和稳定性系数受到含水层渗透系数和库水位升降速率的影响,并且滑坡在库水位下降阶段的稳定性极小状态比蓄水期更具有失稳风险。
Landslide deformation and destruction process and the resulting adverse geo-environmental problems pose a very serious hazard to human engineering activities, and may also cause ecological dislocation and destruction, resulting in more far-reaching impact. The study on the landslides in the Three Gorges reservoir area shows that the stability of landslides does not change monotonously with the dynamic change of reservoir water level, but the stability coefficient reaches a minimum in this process. However, there is still no discussion on the formation and characteristics of this extremely stable state. Based on the limit equilibrium model of landslide groundwater movement and stability evaluation, this paper studies the formation mechanism and influencing factors of landslide stability under the condition of water level rise and fall. The results show that the formation time and stability coefficient of the landslide with minimal stability are affected by the permeability coefficient of the aquifer and the rate of water level rise and fall of the reservoir, and the stability of the landslide in the descending phase of the reservoir water level is more unstable than that of the impoundment risk.