分散性对心墙土料裂缝冲刷影响的试验研究

心墙土料的抗渗性对土石坝的渗透稳定性有非常重要的影响。利用室内渗透变形和裂缝冲刷试验，研究分散性对粘性土抗渗能力的影响，以及分散性、裂缝宽度对心墙土料在有反滤层保护下的抗冲刷性能的影响。结果表明，分散性对粘性土的渗透性几乎没有影响；分散性越强的粘性土，渗透破坏坡降越小；在合适的反滤层保护下，土料的分散性越强，裂缝土样的自愈合能力越强；裂缝宽度为2mm的土样自愈合能力较好。可见，在合适的反滤层保护下，分散性粘土具有较好的抗渗性能，可以作为土石坝防渗心墙的填筑土料。

Experimental Study on Influence of Dispersion on the Crack Washout of the Core Wall Material

The seepage prevention function of the clay to the core wall have a significant effect to the seepage stability of the earth-rock dam. To check if the dispersivity effects the preventing seepage damage capability of the clay, and if the dispersvity and crack width have something to do with the resistance ability to washout of the core wall under filter protection, the author take the seepage deformation and crack washout tests. It turns out the dispersivity nearly have no effect to the permeability of the clay; the clay with more dispersivity,the less preventing seepage damage capability; the sample with 2mm crack width shows better crack self-healing capability;under proper filter protection ,if the dispersivity of the clay is stronger, as a result the sample of the clay shows a better crack self-healing capability. It follows that the dispersive clay takes a excellent preventing seepage damage capability under good filter protection, thus it can be the filling material to the core wall of the earth-rock dam.