冷清公路水库库岸桩锚加固后的渗流变化规律

Seepage change pattern of Lengqing Highway Reservoir bank after pile and anchor reinforcement

以云南冷清公路岸坡为研究对象,建立库区边坡二维饱和-非饱和渗流模型,模拟锚杆(索)和桩加固后不同工况下岸坡渗流场演变规律,分析岸坡加固后浸润线及孔隙水压力变化规律。结果表明:相对未加固岸坡而言,由于加固区的渗流阻力增大及其导致的渗流路径改变,加固后岸坡内浸润线形状、位置分布和孔隙水压力分布发生了变化。从桩加固与锚加固的情况对比看,桩加固的阻渗作用较锚加固的阻渗效果差些。岸坡内孔隙水压力受库水位的升降、分析位置到库水或浸润线的距离、加固区渗透系数的降低及其渗透系数降低区的面积和形状等的影响,加固后岸坡滞后效应更明显。离库水面较远处,其孔隙水压力几乎不受库水位变化和加固措施的影响。

Taking the bank slope of the Lengqing Highway in Yunnan as the research object, a two-di- mensional saturated-unsaturated seepage model of slope in reservoir is built, and is used to simulate the seepage regular pattern of shore slope under different conditions after anchor and pile reinforcement. The changing rule of the infiltration line and pore water pressure after the reinforcement of the bank slope is analyzed. Results show that the shape and location of infiltration line and the distribution of pore water pressure in the reinforced reservoir slope have changed compared with no reinforcement slope, as the seepage resistance increases and the seepage path changes in the reinforcement area. ComFared with the case of anchor reinforcement, the seepage resistance effect of the pile is less than that of the anchor rein- forcement. The pore water pressure in the bank slope is controlled by the water level fluctuation, the dis- tance from analyzed location to the reservoir or the infiltration line, the decrease degree and area and shape of osmotic coefficient, and the lag effect of the reinforced bank slope is more obvious. In the posi- tion far away from reservoir surface, the pore water pressure is almost not affected by the water level and reinforcement measures.