scholarly journals Application of the ‘CPT 2012’ model of AFNOR standard for column design in Poland – Jazowa case study

2019 ◽  
Vol 262 ◽  
pp. 04001
Author(s):  
Lech Bałachowski ◽  
Jakub Konkol ◽  
Kamila Międlarz
Keyword(s):  
Bearing Capacity ◽  
Static Load ◽  
Eurocode 7 ◽  
Pile Design ◽  
Load Tests ◽  
Column Design ◽  
French Standard

This paper presents the ‘CPT 2012’ model incorporated into the AFNOR NF P94-262:2012-07, French standard for pile design fully compatible with Eurocode 7, to the wider Polish audience. The bearing capacity of three reference columns for Vistula Marshlands have been calculated according to ‘CPT 2012’ model and AFNOR recommendations. Then, the design resistances have been compared with ultimate column bearing capacity measured during static load tests conducted on reference columns. The results of comparison are discussed and the discrepancies between measured and calculated bearing capacities are shortly commented.

scholarly journals Bi-Directional Static Load Tests of Pile Models

2020 ◽  
Vol 10 (16) ◽  
pp. 5492
Author(s):  
Michał Baca ◽  
Włodzimierz Brząkała ◽  
Jarosław Rybak
Keyword(s):  
Bearing Capacity ◽  
Static Load ◽  
Load Testing ◽  
Pile Capacity ◽  
Pile Shaft ◽  
Load Tests ◽  
S Curve ◽  
Definition Of ◽  
Standard Tests ◽  
Static Load Testing

This work examined a new method of bi-directional static load testing for piles, referencing the Osterberg test. Measurements were taken, on a laboratory scale, using six models of piles driven into a box filled with sand. This method allowed for separate measurements of pile base and pile shaft bearing capacities. Based on the results, the total pile bearing capacity and equivalent Q–s diagrams were estimated. The results obtained show that the structure of the equivalent curve according to Osterberg is a good approximation of the standard Q–s curve obtained from load tests, except for loads close to the limit of bearing capacity (those estimates are also complicated by the inapplicability and ambiguity of a definition of the notion of limit bearing capacity); the equivalent pile capacity in the Osterberg method represents, on average, about 80% of the capacity from standard tests.

scholarly journals Static Load Tests, Short Series Interpretation

2015 ◽  
Vol 36 (2) ◽  
pp. 45-49 ◽  
Author(s):  
Zygmunt Meyer
Keyword(s):  
Critical Load ◽  
Bearing Capacity ◽  
Static Load ◽  
Critical Value ◽  
Load Test ◽  
Practical Calculation ◽  
Short Series ◽  
Load Tests ◽  
S Curve

Abstract Statistic load test is the most commonly used method for estimation of the bearing capacity of piles. From the test we obtain the series a values: load-settlement, Q–s curve. In practice, it is extremely difficult to reach the critical load of the pile when the settlement turns out of control. The existing methods that allow bearing capacity to be calculated give the value which is very often 1/10 of the critical load. The question arises if it is possible based upon short series of load, i.e., 0–0.4 critical load, to predict the critical value of the load, with accuracy which is sufficient for practical calculation. The paper presents a method how to calculate the critical load based upon short series of load in the static load tests.

scholarly journals EFFECT OF DIFFERENT WOOD DOWELS ON MECHANICAL PROPERTIES OF TRIANGULAR GIRDER TRUSSES

Wood Research ◽  
2021 ◽  
Vol 66 (3) ◽  
pp. 477-488
Author(s):  
Liuliu Zhang ◽  
Cheng Chang ◽  
Shuming Yang
Keyword(s):  
Mechanical Properties ◽  
Energy Dissipation ◽  
Bearing Capacity ◽  
Static Load ◽  
Deformation Resistance ◽  
Stability Performance ◽  
Load Tests ◽  
Different Diameters

Static load tests were carried out on three kinds of triangular girder trusses with different diameter wood dowels, and the effects of that on the structure of girder trusses were discussed. It was found that there was a good synergy between the wood dowels and the girder trusses. Among the triangular girder trusses with different diameters, the 16 mm diameters had the best energy dissipation performance increased by 184% and deformation resistance of 0.73 mm; the 20 mm diameters had the best stability performance, the better bearing capacity of 60.42 kN and deformation resistance of 0.82 mm. The bearing capacity of the double girder trusses was 2.06-2.25 times that of two single trusses, which had the ability to ‘one plus one is greater than two’.

Grouted gravel column-supported highway embankment over soft clay: case study

2015 ◽  
Vol 52 (11) ◽  
pp. 1725-1733 ◽  
Author(s):  
Hanlong Liu ◽  
Gangqiang Kong ◽  
Jian Chu ◽  
Xuanming Ding
Keyword(s):  
Stress Ratio ◽  
Static Load ◽  
Soft Clay ◽  
Construction Method ◽  
Soft Ground ◽  
Soil Stress ◽  
Load Tests ◽  
Column Construction Method ◽  
Highway Embankment

In this paper, a simplified column construction method — the so-called grouted gravel column — and its application to construction of embankments over soft ground are introduced. The construction method, quality assurance (QA), and quality control (QC) of the grouted gravel columns are described. A case study on the application of this method to a highway embankment in China is also presented. The case study shows that about 50% of surface settlement and 60% of the differential settlement between the column head and soil occurred during the construction of the embankment. The column to soil stress ratio was 8.0 for columns with caps and 4.2 for columns without caps. Static load tests were also conducted to assess the bearing capacity of the columns.

Analysis on Reliability of Load Test on Bearing Capacity of Foundation Piles

2014 ◽  
Vol 638-640 ◽  
pp. 671-674
Author(s):  
Yu Zhou Sima ◽  
Qing Hua Sun
Keyword(s):  
Bearing Capacity ◽  
Pile Foundation ◽  
Reliability Index ◽  
Static Load ◽  
Load Test ◽  
Static Load Test ◽  
Statistic Method ◽  
Bayesian Statistic

In static load test, most of piles do not destroy, the piles still exist capacity, which reduce the reliability index of pile foundation. This paper employs Bayesian Statistic method to update the measured capacity of piles. Meanwhile, based on updating data, the reliability index is calculated considering the destruction of piles. The case study shows that the reliability index of capacity becomes large when the time of pile destruction increases. Therefore, when judging the safety of pile foundation, it is highly necessary to consider the influence of pile destruction on reliability of piles.

EXPERIMENTAL EVALUATION OF SOIL REINFORCEMENTS IN UNPAVED ROAD

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Nahla Salim
Keyword(s):  
Bearing Capacity ◽  
Static Load ◽  
Sandy Soils ◽  
Crushed Stone ◽  
Unit Weight ◽  
Harmonic Load ◽  
Geogrid Reinforcement ◽  
Dry Unit Weight ◽  
Load Tests ◽  
Number Of Cycles

In this study, a series of 24 laboratory tests were conducted on a footing resting on crushed stone with 17.68 kN/m3 dry unit weight overlying sandy soils of two relative densities corresponding to (60% and 80%). The subbase layer is of crushed stone with a thickness of 5, 7.5 and 10 cm. Ten tests were conducted under static load with and without geogrid. All the other 14 model tests were carried out under harmonic load which was applied in a sequence determined prior (40% of static load). Tests were conducted at (2) Hz frequency according to the loading value. The process of the loading was continued until the number of cycles reached 104. The results indicated that, for static load and with the inclusion of the geogrid, as the thickness of the subbase layer increases, the percentage of increase in bearing capacity was reduced. In general, using geogrid reinforcement with subbase thickness of 7.5 and 5 cm causes an increase in bearing capacity approximately 1.5 to 2 times greater than for unreinforced respectively. This means that by using geogrid reinforcement, the thickness of subbase can be reduced which causes a reduction in construction cost.

Pile load tests in saline permafrost at Clyde River, Northwest Territories

1988 ◽  
Vol 25 (1) ◽  
pp. 24-32 ◽  
Author(s):  
J. F. (Derick) Nixon
Keyword(s):  
Bearing Capacity ◽  
Pore Water ◽  
Salt Content ◽  
Field Testing ◽  
Testing Procedure ◽  
Load Testing ◽  
Pile Design ◽  
Load Tests ◽  
Pore Water Salinity ◽  
Pile Load Tests

Significant salt content in the pore phase of permafrost causes dramatic reduction in strength or bearing capacity. Previous experience with laboratory tests and limited field testing discussed in the Soviet literature indicate that creep rates can be accelerated many times and foundation bearing capacities reduced by factors of 2–3 if pore water salinities exceed 10–20 ppt. At Clyde River on the northwest coast of Baffin Island, pile load tests were carried out in 1982. A combination of high salinities and significant excess ice contents at some locations suggested that a limited program of pile load testing should be carried out to confirm or modify the initial pile loadings based on previously published material. No fully documented case history was available to support initial pile design loads.Three piles were subjected to loads of five different magnitudes for different durations. Creep settlement was initiated and persisted in all cases. Continuous curve fitting was carried out by computer, and the resulting smoothed strain rate plotted with time. The minimum settlement rates were compared with earlier predictions. They were generally somewhat faster than results from previous laboratory saline creep testing combined with theoretical pile design based on creep settlement.The tests highlight the dramatic reductions in foundation bearing capacity and acceleration in pile creep rates that can be expected in permafrost exhibiting significant pore water salinity. A simplified testing procedure suitable for laboratory or field testing is described. Key words: permafrost, saline, piles, load tests, laboratory, field, in situ, capacity, creep, creep rate, salinity test.

scholarly journals Analysis of the Bearing Capacity of Helical Pile with Hexagonal Joints

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1890 ◽  
Author(s):  
Daehyeon Kim ◽  
Kyemoon Baek ◽  
Kyungho Park
Keyword(s):  
Bearing Capacity ◽  
Field Test ◽  
Static Load ◽  
Load Test ◽  
Basic Data ◽  
Pile Installation ◽  
Helical Piles ◽  
Load Tests ◽  
Pile Load Test

This study aims to improve shafts with hexagonal joints so that they will not require welding or bolts in static load tests. In order to evaluate the bearing capacity of helical piles, two sites were selected to conduct pile installation for the field test and the pile load test. For the pile load test, a static pile load test and a dynamic pile load test were carried out, and torque was measured during pile installation in a field test to compare and analyze the expected bearing capacity and thus assess the feasibility of the method for estimating the bearing capacity. The field pile load test revealed that the bearing capacity of the gravity grout pile was the same or greater than 600 kN in the static pile load test in accordance with the AC 358 code. The non-grout pile showed a bearing capacity that was the same or smaller than 600 kN, suggesting that gravity grouting is required. Moreover, the field pile load test was used to establish the bearing capacity equation considering the torque in the pile installation, and a small number of samples were used to establish the equation, which can be used as basic data.

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