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首页> 外文会议>International Conference on Soil Mechanics and Geotechnical Engineering(16 ICSMGE) vol.3; 2005; Osaka(JP) >Filter performance test for dams containing cracks
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Filter performance test for dams containing cracks

机译：含裂缝大坝的过滤性能测试

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摘要

A new test procedure has been developed to evaluate filter performance when both the filter and the core (base) material have been cracked. This procedure allows the orientation of the crack to be horizontal or vertical, and accommodates flow in the horizontal and vertical directions as well. The applied hydraulic gradient and the thickness of the crack can also be varied. Two apparatuses have been constructed and tested. The smaller apparatus allows testing of truncated cylindrical test specimens that are 4″ (10 cm) in diameter by 8″ (20 cm) long. The larger apparatus allows testing of specimens that are approximately 12″ x 12″ x 12″ (30 cm x 30 cm x 30 cm). An automated data acquisition system was developed to measure the pressures and flow rates through the test specimens as well as obtaining a video record of the filter performance. Initial tests have shown that the current filter criteria used by the U.S. Bureau of Reclamation, U.S. Army Corps of Engineers, and the National Resource Conservation Service provide filters that perform reliably even when cracked at the start of flow.
机译：开发了一种新的测试程序来评估过滤器和芯材（基础）均破裂时的过滤器性能。此过程允许裂纹的方向为水平或垂直，并同时适应水平和垂直方向的流动。施加的水力梯度和裂缝的厚度也可以改变。已经构造并测试了两种设备。较小的设备可以测试截断的圆柱状试样，该试样的直径为4英寸（10厘米），长为8英寸（20厘米）。较大的设备可以测试大约12英寸x 12英寸x 12英寸（30厘米x 30厘米x 30厘米）的样本。开发了一个自动数据采集系统，以测量通过试样的压力和流速，并获得过滤器性能的视频记录。初步测试表明，美国开垦局，美国陆军工程兵团和美国国家资源保护局使用的当前过滤器标准提供的过滤器即使在流量开始时破裂也能可靠地运行。

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