降低滑坡地下水位的充气截排水法最佳充气压力研究

发布时间：2018-06-30 00:25

  本文选题：边坡工程 + 充气截排水　； 参考：《岩石力学与工程学报》2017年04期

【摘要】：充气截排水技术拟在潜在滑坡后缘或长边坡坡体上进行充气,在后缘来水路径上形成非饱和区,截断后缘汇水或减少后缘水流向坡体内的入渗,从而降低坡体内的地下水位,提高边坡的稳定性。为了探讨充气气压对充气截排水效果的影响,通过二维数值模型对不同气压下坡体水位变化进行分析,并通过物理模型试验对数值模拟结果进行验证,得出如下结论:在坡体中充气能显著降低坡体地下水位,截流减渗效果明显;对于特定坡体,存在与之对应的截排水起始充气压力和最佳充气压力;只有当充气压力大于截排水起始充气压力时,充气截排水才有效果,坡体前缘水位才会下降;当充气压力介于起始充气压力和最佳充气压力之间时,随着气压的增大,坡体前缘水位不断降低,充气截排水效果随气压增大而增大;当充气压力大于最佳充气压力时,充气截排水效果随气压增大而减小。
[Abstract]:The aeration interception and drainage technique is intended to inflate the body of the slope on the back edge of the potential landslide or the slope along the long side of the slope, and form an unsaturated area on the water path of the back edge, which will cut off the catchment of the rear edge or reduce the infiltration of the water from the back edge to the slope, thereby reducing the groundwater level in the slope. Improve the stability of the slope. In order to study the effect of inflatable pressure on the effect of aerated interception and drainage, the variation of water level of slope body under different pressure was analyzed by two-dimensional numerical model, and the results of numerical simulation were verified by physical model test. The conclusions are as follows: aeration in slope can significantly reduce the groundwater level of slope, and the effect of closure and seepage reduction is obvious, for certain slope, there are corresponding initial inflatable pressure and optimal inflatable pressure of intercepting drainage. Only when the inflatable pressure is greater than the initial inflatable pressure of intercepting drainage, can the water level of the leading edge of the slope decrease, and when the inflatable pressure is between the initial inflatable pressure and the optimal inflatable pressure, with the increase of the air pressure, The water level of the front edge of the slope is decreasing and the effect of aeration and drainage is increasing with the increase of air pressure, and when the inflatable pressure is greater than the optimal inflatable pressure, the effect of aeration interception decreases with the increase of air pressure.
【作者单位】： 浙江大学海洋学院;
【基金】：国家自然科学基金资助项目(41372277) “十二五”国家科技支撑计划项目(2012BAK10B06) 中央高校基本科研业务费专项资金资助(2014QNA4028)~~
【分类号】：P642.22
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本文编号：2084026