Constant Head Permeability Test | Procedure and Data Analysis

This video explains the procedure of constant head test to determine the soil permeability. This test is performed on coarse-grained soil with a high coefficient of permeability. The soil sample is first saturated over several days to establish a constant water flow through the soil. The test takes a few minutes, during this test, the amount of water (water volume) is measured over time, and the water heads on the standpipes are measured as well. Darcy's law is used to calculate the coefficient of permeability. The fundamentals of water flow in soil mass, including liquefaction and quick conditions are described in this video • Explanation of Water F... while the principles of vertical water flow in soil are explained using a practical example in this video • Vertical Water Flow in... . Watch this video to learn how to apply the data from this test to estimate the rate of water seepage • How to Draw CORRECT Fl... .
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[@MOHAMEDMAMOUN-l9u]

thank you sir

[@678JuliaC]

Thank you! Excellent video

[@indrajitsingh4196]

Sir great explanation

[@Tellie-iu4uv]

I just wanted to ask. When you say, "When we change the water flow, we also change the level in manometers," how do I do this? How do I change the level of the manometers? Thank you!

[@joyt1825]

hello! i would like to find out the water level if a standpipe is inserted such that the intake point is 50 mm above the bottom of the sample. what does it mean?

[@AB-hm3vb]

could you please explain step by step how to prepare sample, de-air system, etc.? what should be done before first measurement? thank you

[@GeoEngineeringandScience]

That's a long (time-consuming) process to prepare the specimen, and it actually takes much longer than the test itself. We follow the standard procedure that describes how it should be done. Here are the references: Australian Standard AS 1289 6.7.1-2001. Method of testing soils for engineering purposes: Method 6.7.1 Soil strength and consolidation tests - Determination of permeability of a soil - Constant head method for remoulded specimen. (2) Australian Standard AS 1289 6.7.2-2001. Method of testing soils for engineering purposes: Method 6.7.2 Soil strength and consolidation tests - Determination of permeability of a soil - Falling head method for remoulded specimen.

[@omedmuhammad2674]

Great video

[@bananaenjoyer123]

thanks ! very helpful

[@neophatsoane6807]

how did you get the volume of flow?

[@daridranarayan]

How to calculate C1(10`3) value for formula K= C1 X (Q/H) , such as for NX casing C1 is 7.95 where dia of hole 7.62cm. How to evaluate C1 value 7.95

[@geoninja3094]

what about open end test permeability data

[@GeoEngineeringandScience]

not part of this video