水平排水孔地下水位线附近淤堵机理分析

水平排水孔作为滑坡治理中最广泛应用的排水技术,其淤堵问题严重影响使用寿命与效益。机械淤堵是水平排水孔的主要淤堵形式,尤其是水平排水孔地下水位线附近淤堵作用强烈。通过模型试验探究仰角、间歇性排水、回渗等因素对水平排水孔淤堵的影响,根据模型试验结果分析水平排水孔在地下水位线附近的淤堵机理。结果表明:水平排水孔的淤堵位置与渗流路径有关,小仰角是造成水平排水孔淤堵的重要原因,间歇性排水及回渗问题都会加重其淤堵,泥沙在水流中的沉积作用和细颗粒泥沙的絮凝作用是水平排水孔机械淤堵发生的原因。

Analysis of Clogging Mechanism of Horizontal Drainage Holes near Groundwater Level

Horizontal drainage hole is the most widely used drainage technology in landslide treatment. But the clogging problem seriously affects its service life and efficiency. Mechanical clogging is the main clogging form in horizontal drainage hole. The siltation is more serious when the drainage holes are located near the underground water table. A series of physical model experiments were carried out to analyze the influence of elevation, intermittent drainage and re-seepage problems on the clogging of horizontal drainage hole. Meanwhile, the clogging mechanism of horizontal drainage near the underground water table was analyzed according to the physical model test results. The results show that the location of the silt blockage in horizontal drain hole is related to the seepage path. A small elevation angle is the main reason for the clogging of horizontal drainage hole. Furthermore, intermittent drainage and re-seepage problems aggravate the clogging in horizontal drain hole. Sediment deposition in the water and fine sediment flocculation are the cause of mechanical clogging in horizontal drain hole.