散粒土渗透破坏判别方法试验研究

渗透破坏是诱发土石坝、堤防、基坑开挖等岩土工程失稳破坏的重要原因之一，目前对于土体渗透破坏判别方法的研究已经取得了比较多的成果，但是对于不同判别方法的适用性和使用范围没有明确的划分。利用自主研发的渗透破坏实验装置，开展了一系列散粒土渗透破坏特性试验，研究了细颗粒含量、细颗粒组成以及干密度等对散粒土渗透破坏特性的影响，得到了试样渗透破坏过程中渗流流速、临界水力梯度、渗透系数等的变化规律。同时，将试验结果与已有的判别方法和计算方法的结果进行了对比分析，得出了各种方法的适用范围和优缺点。

Experimental study on seepage failure discrimination method of granular soil

Seepage failure is one of the most important causes of stable-lossing failure of geotechnical projects such as earth-rock dam, embankment and foundation pit. Many achievements have been obtained in the study of seepage failure discrimination method of granular soil at present, but there is no clear division to the adaptability and application scope of these different discrimination methods. Based on a self-developed seepage experiment instrument, a series of granular soil seepage failure tests were carried out. In the test, the influences of dry density, fine grain content, fine grain composition on granular soil seepage failure are studied, and the variation laws of seepage velocity, critical hydraulic gradient, permeability coefficient in the seepage failure process are revealed. The test data are compared with the results of the existed discrimination methods, and the application scope as well as the pros and cons of these methods are made clear.