How to calculate dcp penetration rate
A method for estimating the material G-class [5] based on the DCP penetration rates and the estimated moisture content was developed in 1985 [6] and improved in 1992 (Table 1) [7]. The use of this method requires a visual estimate of the field moisture content at the time of DCP testing but also has the limitation of assuming that dynamic cone penetrometer. The DCP index or reading is defined as the penetration depth (D) in mm for a single drop of hammer. The cone is driven in to the ground upto the desired depth and average DCP index is calculated for a single blow. Depth of penetration considered in the study was 800mm because The penetration depth is recorded after every 5 blows. A number of methods have been developed to estimate soil properties from the penetration rate. This paper discusses the DCP as a tool to predict the allowable bearing pressure. Keywords: In-situ testing, Dynamic Cone Penetrometer, allowable bearing pressure estimation, economic testing. 5.1 This test method is used to assess in situ strength of undisturbed soil and compacted materials (or both). The penetration rate of the 8-kg [17.6-lb] DCP can be used to estimate in situ CBR (California Bearing Ratio), to identify strata thickness, shear strength of strata, and other material characteristics. the DCP curve. It relates the depth of each layer (vertical axis) to the percentage CBR on the horizontal axis. The following formulae are used; If average penetration rate (DN) > 2mmlblow then; CBR = 410xDN(-1,27) [4.3] and if DN S 2mm1blow then:
7 Sep 2016 compacted soil, and granular material that may require undercut. The penetration rate of the DCP may be used to estimate and identify strata.
3 Nov 2015 Calculate the value of penetration (in mm) for each blow by subtracting the previous Fig-1 DCP chart Fig-2 Variation of CBR with Depth I´m having some trouble to calculate DCP penetration rate and estimated CBR. California Bearing Ratio (CBR) value is very popular among highway The DCP index or reading is defined as the penetration depth (D) in mm per a single drop of the dynamic cone penetrometer for determining the CBR,an experimental DCP structure number for the total pavement is thus the sum of the separate layer DSN's: ft h h If average penetration rate (DN) > 2mmlblow then; correlate well with the average CBR calculated whilst layers 1 and 4 show some scatter. In. California Bearing Ratio & Dynamic Cone Penetrometer. MAY 2001. Page 5.21 The dynamic cone penetrometer (DCP) test was developed by Transport and. Road Research It is also used for determining the in-situ CBR value of Penetration rates as low as 0.5 mm/blow are acceptable but if there is no measurable
the DCP curve. It relates the depth of each layer (vertical axis) to the percentage CBR on the horizontal axis. The following formulae are used; If average penetration rate (DN) > 2mmlblow then; CBR = 410xDN(-1,27) [4.3] and if DN S 2mm1blow then:
The DCP index is based on the average penetration depth resulting from one blow of the 17.6 lb (8 kg) hammer. The average penetration per hammer blow of the 10.1 lb (4.6 kg) hammer must be multiplied by 2 in order to obtain the DCP index value from the correlation equation in paragraph 4. DCP testing can be performed by a crew of one to three people. A person working alone must raise and drop the hammer, plus measure and record the penetration. The use of a video camera to record the cone penetration for each blow is possible. The video camera should be positioned at the pavement surface. In order to determine the DCP. structural number (DSN 800 ) the number of blows required to reach a depth of 800 mm is required. Typically, when a depth of 800 mm is not attained, the penetration profile can be extrapolated. either based on the last few readings or using a specified or expected penetration rate. How Penetration Rate is Calculated. Penetration rate is the percentage of your target market that you reach with a product, service or brand in a period of time. Calculation. Penetration rate requires a well defined target market. In some cases, a total addressable market or serviceable available market is used.
compared with penetration rate of the DCP. rate of the DCP. In the final part of the study, analysis of the tests was done to determine if correlations between.
The DCP index is based on the average penetration depth resulting from one blow of the 17.6 lb (8 kg) hammer. The average penetration per hammer blow of the 10.1 lb (4.6 kg) hammer must be multiplied by 2 in order to obtain the DCP index value from the correlation equation in paragraph 4. DCP testing can be performed by a crew of one to three people. A person working alone must raise and drop the hammer, plus measure and record the penetration. The use of a video camera to record the cone penetration for each blow is possible. The video camera should be positioned at the pavement surface. In order to determine the DCP. structural number (DSN 800 ) the number of blows required to reach a depth of 800 mm is required. Typically, when a depth of 800 mm is not attained, the penetration profile can be extrapolated. either based on the last few readings or using a specified or expected penetration rate. How Penetration Rate is Calculated. Penetration rate is the percentage of your target market that you reach with a product, service or brand in a period of time. Calculation. Penetration rate requires a well defined target market. In some cases, a total addressable market or serviceable available market is used. An alternative to compa-ratio, range penetration also uses a simple formula that divides the salary rate less the minimum of the range by the maximum less the minimum of the range. For example, if the range is $25,000 to $75,000 and the salary is $45,000, the range penetration is 40%.
Dynamic Cone Penetration testing. DCP testing is used to determine the strength of the subsurface and design load of the soil. The engineers perform the testing in-situ to give an estimation of the load bearing capacity which a soil can withstand, by measuring the extent of penetration into the ground of a calibrated tip or cone.
Procedure Record the initial reading on the dynamic cone penetrometer scale. Calculate the value of penetration (in mm) for each blow by subtracting Calculate the cumulative depth of penetration Draw a chart using the data of cumulative depth of penetration and number of blows. (See Fig-1). The terms Cone Penetration Testing (CPT) and Dynamic Cone Penetration Testing (DCPT) actually refer to two very different methods of carrying out a cone penetration test. In CPT, the cone-shape tip is pressed into the soil at a measured rate, typically by a large (and expensive) machine that can deliver a considerable degree of steady pressure at a controlled rate. Dynamic Cone Penetration testing. DCP testing is used to determine the strength of the subsurface and design load of the soil. The engineers perform the testing in-situ to give an estimation of the load bearing capacity which a soil can withstand, by measuring the extent of penetration into the ground of a calibrated tip or cone. DCP penetration rates of obviously un-trafficked material adjacent to the existing road with trafficked material under the road. 2. Design process 2.1. Traffic determination As in any pavement design, the cumulative traffic over the design life of the road should be estimated. This estimate is much more difficult for low volume roads (less
variation and measurement error when determining was the Dynamic Cone Penetrometer (DCP), a simple DCP penetration rate with field moisture content.