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降雨使坡内地下水位上升,坡体的基质吸力和暂态孔隙水压力会随着降雨过程和时间呈现不同的变化趋势。采用抗滑桩、挡墙等工程防治后,针对滑坡体滑带土的性质变化以及抗滑结构的设置是否会影响到滑坡体的自然排水通道,导致坡体地下水位的抬升,从而影响滑坡防治效果等问题进行了研究。以鹰厦线K290滑坡为主线,通过开展滑坡饱和-非饱和渗流模型试验与数值分析,探讨了降雨入渗及地下水位变化下滑坡体及滑带土体积含水率与基质吸力的变化规律,以及其对滑坡防治前后坡体渗流场的影响。在此基础上,探讨了滑带土基质吸力对抗剪强度的贡献。研究表明:防治前后滑坡体及滑带土基质吸力受降雨强度等条件影响明显,不同深度处滑带土基质吸力变化呈现不同的变化规律,在土质滑坡的防治中应考虑抗滑桩的布置对滑带土性质的影响。
Rainfall causes the groundwater level in the slope to rise, and the matrix suction and transient pore water pressure of the slope body will show different trends along with the rainfall course and time. After anti-slide piles and retaining walls are used for prevention and treatment of such problems, the nature of landslide soil and the anti-skid structure will affect the natural drainage channel of landslide body, which will lead to the elevation of groundwater level and thus the landslide prevention Effects and other issues were studied. Taking the J290 landslide of Yingxiaxia Line as the main line, the variation regularity of volumetric water content and matrix suction of landslide and landslide soil under rainfall infiltration and groundwater level change was discussed through the landslide saturated-unsaturated seepage model test and numerical analysis. Influence of landslide on seepage field before and after landslide control. On this basis, the contribution of the matrix suction of the sliding zone soil to the shear strength is discussed. The results show that the soil suction before and after landslide control and landslide soil is obviously affected by the rainfall intensity and so on. The variation of the soil suction variation of landslide soil presents different changes at different depths. The arrangement of anti-slide piles should be considered in the prevention and control of soil landslides Slippery soil with the nature of the impact.