| 防渗墙粗粒土槽孔泥皮的抗渗性试验研究 |
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| 引用本文： | 李建军,邵生俊,杨扶银,杨春鸣.防渗墙粗粒土槽孔泥皮的抗渗性试验研究[J].岩土力学,2012,33(4):1087-1093. |
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| 作者姓名： | 李建军 邵生俊 杨扶银 杨春鸣 |
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| 作者单位： | 西安理工大学 岩土工程研究所，陕西省黄土力学与工程重点实验室，西安 710048 |
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| 基金项目： | 国家自然科学基金项目(No.10872161);陕西省黄土力学与工程重点实验室基金项目 |
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| 摘 要： | 通过自制泥浆渗透试验仪，针对粗粒土地基防渗墙泥皮的渗透稳定性问题，开展了护壁泥皮抗渗性能的试验研究。结果表明，泥皮具有明显的截渗作用；不同压差作用下泥浆渗透形成的泥皮具有不同的抗渗特性，压差越大、泥皮越致密，抵抗渗透破坏的能力越强，泥皮的渗透性也就越小；反压渗水作用下泥皮的抗渗性能较正压渗水作用下的抗渗性能差；随着水力作用持续时间的增长，泥皮的结构发生变化，孔隙增大，流速逐渐增大，在较大水力梯度作用下会发生破坏；泥皮的临界水力梯度与其形成时压差作用大小有关，泥皮形成压差越大，正、反向渗水的临界水力梯度越大；反之，临界水力梯度越小。关于泥皮抗渗性能的深化认识，对于完善防渗墙设计与施工具有重要的意义。
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| 关 键 词： | 深厚覆盖层 泥浆渗透试验 泥皮 抗渗性 |
| 收稿时间： | 2010-09-25 |
Experimental research on impermeable characteristics of slurry cake in cutoff wall hole of coarse-grained soil |
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| LI Jian-jun
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SHAO Sheng-jun
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YANG Fu-yin
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YANG Chun-ming.Experimental research on impermeable characteristics of slurry cake in cutoff wall hole of coarse-grained soil[J].Rock and Soil Mechanics,2012,33(4):1087-1093. |
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| Authors: | LI Jian-jun SHAO Sheng-jun YANG Fu-yin YANG Chun-ming |
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| Institution: | Shaanxi Key Laboratory of Loess Mechanics and Engineering, Institute of Geotechnical Engineering, Xi’an University of Technology, Xi’an 710048, China |
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| Abstract: | In order to explore the seepage stability of slurry cake formed in the cutoff wall hole of coarse-grained soil,the impermeable characteristics of slurry cake are tested by the self-made slurry seepage apparatus.After the slurry cake wall is formed by the slurry seepage through sand samples with some particles gradation under some pressure difference,the seepage experiments of water passing through the frontal face of slurry cake or through the reversal face of slurry cake are carried out under some pressure difference.Through the analysis of test results,the following knowledge are obtained.The cutoff effect of slurry cake bearing with large gradient is significant.There are different seepage characteristics of slurry cakes formed under different pressure differences.The greater the pressure difference when the slurry cake are formed,the more compact the slurry cake is,the stronger the ability is to resist infiltration and damage,the smaller the permeability of the slurry cake is.The impermeability of water passing through reversal face of slurry cake under some pressure difference is smaller than through frontal face of slurry cake under same pressure difference.With the sustaining time of hydraulic action increasing,the structure of slurry cake will change and its seepage velocity also increases.Under the large hydraulic gradient action the slurry cake damage may occur under certain osmotic pressure difference.The critical hydraulic gradient is closely associated with the loading pressure difference of slurry cake formation.The larger the pressure difference is,the larger the critical hydraulic gradient is.On the contrary,the smaller the critical hydraulic gradient is.The above-mentioned knowledge has theoretical and practical importance that the design method and construction technology of cutoff wall in large depth covering layer is improved by investigating the impermeable characteristics of slurry cake. |
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| Keywords: | large depth overburden layer slurry seepage experiment slurry cake the impermeable characteristics |
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