孙红月, 帅飞翔, 尚岳全, 许欢, 汪东飞. 2019: 边坡俯倾排水孔负压排水法研究. 工程地质学报, 27(3): 585-591. DOI: 10.13544/j.cnki.jeg.2018-230
    引用本文: 孙红月, 帅飞翔, 尚岳全, 许欢, 汪东飞. 2019: 边坡俯倾排水孔负压排水法研究. 工程地质学报, 27(3): 585-591. DOI: 10.13544/j.cnki.jeg.2018-230
    SUN Hongyue, SHUAI Feixiang, SHANG Yuequan, XU Huan, WANG Dongfei. 2019: STUDY ON NEGATIVE PRESSURE DRAINAGE METHOD OF DOWNDIP BOLEHOLE IN SLOPE. JOURNAL OF ENGINEERING GEOLOGY, 27(3): 585-591. DOI: 10.13544/j.cnki.jeg.2018-230
    Citation: SUN Hongyue, SHUAI Feixiang, SHANG Yuequan, XU Huan, WANG Dongfei. 2019: STUDY ON NEGATIVE PRESSURE DRAINAGE METHOD OF DOWNDIP BOLEHOLE IN SLOPE. JOURNAL OF ENGINEERING GEOLOGY, 27(3): 585-591. DOI: 10.13544/j.cnki.jeg.2018-230

    边坡俯倾排水孔负压排水法研究

    STUDY ON NEGATIVE PRESSURE DRAINAGE METHOD OF DOWNDIP BOLEHOLE IN SLOPE

    • 摘要: 实时排出坡体地下水可减少降雨诱发型滑坡灾害的发生。仰斜排水孔是滑坡治理中常用的排水方法,但排水孔的淤堵问题影响了排水的效果,其使用的耐久性也得不到保证。论文提出一种俯倾排水孔负压排水法,将钻孔分为下部透水孔段和上部注浆封闭孔段,中间使用止浆体分隔,虹吸排水管穿过注浆封闭孔段进入透水孔段的底部。当坡内地下水位上升,引起排水管进水口的水头高程大于钻孔的孔口高程时,虹吸排水自然启动并在透水孔段内产生负压,从而加快排水速度。负压排水过程的抽吸作用可将孔内淤积物排出,而封闭孔段将钻孔透水孔段与大气隔离,有利于解决化学淤堵问题和生物淤堵问题。论文首先定性分析了该方法的作用原理和应用可行性,再在恒定水头条件下,进行了负压和排水能力的物理模型试验。试验表明:(1)排水过程可以产生必要的孔内负压条件;(2)排水一段时间后,透水空腔内的压强值不再变化,排水流量基本稳定;(3)增大排水管径或增大排水口与透水空腔高差,可使透水空腔内产生更大的负压值,从而提高排水效果。因此该方法是一种新型有效的排水方法,有较好的工程应用价值。

       

      Abstract: Draining slope groundwater in real time can reduce the occurrence of landslides. The inclined drainage hole is an important method for landslide treatment. However, the clogging problem of the method restricts the effect of drainage, and the durability is not guaranteed. This paper proposes a negative pressure drainage technique for the downdip drainage hole. The lower part of hole is a permeable hole section, and the upper part is a grouting closed hole section. A slurry stopper is provided between the permeable hole section and the grouting closed hole section. The siphon pipe is placed at the bottom of the permeable hole section through the grouting closed hole section. When the water level in the slope rises and the water head height of the drain inlet is greater than the height of the borehole orifice, the siphon drainage starts naturally under the effect of height difference, resulting in the generation of the vacuum pressure in the permeable hole section, and thus the drainage rate is accelerated. The suction effect of the negative pressure drainage can discharge the silt in the hole. Moreover, the closed hole section isolates the water-air connection between the permeable hole section and the atmosphere, which is helpful to solve the problems of chemical and biological clogging. In this study, the principle and application feasibility of the proposed method is qualitatively analyzed. In addition, the physical model test of negative pressure and drainage capacity under constant head conditions is carried out. The model test material is fine sand. The results demonstrate that:(1)The drainage process can produce the necessary negative pressure conditions in the hole. (2)After draining for a period of time, the pressure value in the permeable cavity no longer changes, and the drainage flow is basically stable. (3)Increasing the diameter of the drainage pipe or the height difference between the drain outlet and the permeable cavity can generate a larger negative pressure value in the permeable cavity, thereby improving the drainage effect. Therefore, the proposed method is a new and effective drainage method and has a good engineering application value.

       

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