充气截排水滑坡治理数值模拟研究

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摘要依据充气排水原理和非饱和渗流理论，提出在后缘水入渗路径上设置充气孔进行充气排水，从而形成非饱和截水帷幕的滑坡治理方法。气排水过程属于多项渗流问题，是一个非常复杂的气–水两相流过程，以渗流力学为基础，建立气–水两相渗流模型描述流体在地层中真实的物理过程。通过有限元方法对充气截排水方法的可行性和影响截排水效果的影响因素进行模拟分析。分析得出如下结论：气体主要沿着水位降低的方向扩散，后缘来水的渗流方向大部分发生改变而流向坡面，充气排水形成的非饱和区截排水效果良好；气排水存在启动压差，渗透系数越小，启动压差越大；充气气压越大，截排水效果越好；渗透系数和孔隙率对截排水效果无影响。

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关键词 ：边坡工程, 滑坡治理, 充气, 截排水, 数值模拟, 渗透系数, 充气气压, 孔隙率

Abstract：On the basis of the water drainage theory with air filling and the seepage theory in unsaturated soil，the paper presents a method for controlling landslide，i.e. forming a unsaturated curtain for cutting off water in seepage path with compressed air. The process of water drainage with compressed air belongs to a very complex air-water two-phase flow process. The paper established a mathematical model to describe the real flow process for fluid on the basis of seepage mechanics，and used finite element method to analyze the effect of water intercepting and the influencing factors by using two-phase flow model for air and water. According to numerical simulations，the conclusions are drawn as follows：the air diffuses along the direction of lower water levels and the water flow direction changes to slope surface，so the effect of intercepting water is fine；the intercepting water process exists the start-up pressure and it increases with decreasing permeability coefficient；the effect of intercepting water is better with larger air pressure；the permeability coefficient and porosity have no effect on water intercepting.

Key words： slope engineering landslide treatment air filling intercepting water and drainage numerical simulations permeability coefficient air pressure porosity

收稿日期: 2013-05-27

引用本文:

杜丽丽1，孙红月2，尚岳全1，康剑伟2，刘长殿2. 充气截排水滑坡治理数值模拟研究[J]. 岩石力学与工程学报, 2014, 33(sl): 2628-2634.
DU Lili1，SUN Hongyue2，SHANG Yuequan1， KANG Jianwei2 ，LIU Changdian2. NUMERICAL SIMULATIONS OF WATER INTERCEPTING AND DRAINAGE ASSOCIATED WITH AIR FILLING FOR LANDSLIDE TREATMENT. , 2014, 33(sl): 2628-2634.

链接本文:

http://www.rockmech.org/CN/Y2014/V33/Isl/2628

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