Fall cone test


The Fall cone test, also called the cone penetrometer test or the Vasiljev cone test, is an alternative method to the Casagrande method for measuring the Liquid Limit of a soil sample proposed in 1942 by the russian researcher Piotr Vasiljev and first mentioned in the russian standard GOST 5184 from 1949. It is often preferred to the Casagrande method because it is more repeatable and less variable with different operators. Other advantages of the fall cone test include the alternative to estimate the undrained shear strength of a soil based on the fall cone factor K.
In the Fall cone test, A stainless steel cone of a standardized weight and tip angle is positioned so that its tip just touches a soil sample. The cone is released for a determined period of time, usually 5s, so that it may penetrate the soil. Several standards around the globe exist. Main differences are related to the cone tip angle and cone mass. The liquid limit is defined as the water content of the soil which allows the cone to penetrate a determined depth during that period of time. The penetration depth at which the liquid limit is measured depends on the standard and method adopted. For example, one of the most recognized standards is the BS 1377. The British standard defines the liquid limit as the water content of a soil at which a 80g, 30º cone penetrates 20mm. Because it is difficult to obtain a test with exactly 20 mm penetration, the procedure is performed multiple times for a range of water contents and the results are interpolated.. Furthermore, the undrained shear strength for each one of those measured water content can be computed as proposed by Hansbo:
where,
cu = Undrained shear strength;
K = Fall cone factor;
Q = Cone weight;
h = Penetration depth.
The fall cone factor can vary between 0.5 and 1.33. It can be estimated as proposed by Llano-Serna and Contreras:
where,
= Equivalent rate of rotation when measuring the undrained shear strength using the mini shear vane test.
A summary of different existing standards is shown in the table below:
CountryRussiaUKFranceIndiaAustraliaNew ZealandChinaISOSwedenNorwayCanadaJapan
StandardGOST 5184-49BS 1377NF P 94-052-1IS 2720AS 1289NZS 4402SD128-007-84ISO/TS 17892-12SS 027120NS 8002CAN/BNQ 2501-092-M-86JGS 0142
Cone angle 30303030.530303030, 6060606060
Cone mass 7680808080807680, 6060606060
Relationship used during interpretationh-wh-wh-wh-wh-wh-wlog h - log wh - w, log h - wlog h - wlog h - wh - wh -w
Cone penetration depth at liquid limit 1020172020201720, 1010101011.5