Impact of ACIP Pile Drilling Technique on Subsurface Soil Density

2016 ◽  
Author(s):  
René Schäfer
Keyword(s):  
Soil Mass ◽  
Soil Conditions ◽  
Industrial Complex ◽  
Cone Penetration ◽  
Pile Capacity ◽  
Cone Penetration Tests ◽  
Loose Deposits ◽  
Subsurface Soil ◽  
Drilling Technique ◽  
European Code

For the foundation of an industrial complex, auger-cast-in-place piles (ACIP-Piles) have been installed on behalf of the recommendation of a local geotechnical consultant. With respect to the poorly graded sand deposits and the high ground water table, the installation was critically reviewed with respect to the European Code DIN EN 1536. In the course of the installation process of a couple of working piles, extensive soil was drilled by the auger, which led to a loss of soil mass in the vicinity of the pile shafts. A detailed engineering analysis came to the conclusion, that the reasons of the damage can be attributed to a concurrence of the subsurface soil conditions, the chosen drilling technique, the choice of the contractor as well as the workmanship. However, a distinct soil loosening could also be measured by a plenty of cone penetration tests in the vicinity of those working piles, which have apparently been installed properly. Surprisingly, the compact sand layers were much more affected by the installation process than the loose deposits. These findings lead to the conclusion, that the installation process of ACIP piles has to be critically evaluated during the construction process and may become a decisive design influence in the case of a pile design by empirical pile capacity magnitudes.

scholarly journals Pile Capacity Calculation by using SPT and CPT Data

2019 ◽  
Vol 2 (3) ◽  
pp. 1377-1387
Author(s):  
Ertan Bol ◽  
Zeynep Süreyya Genç
Keyword(s):  
Field Tests ◽  
Cone Penetration ◽  
Pile Capacity ◽  
Cone Penetration Tests ◽  
Pore Water Pressures ◽  
Ground Conditions ◽  
Capacity Calculation ◽  
Specific Geometry ◽  
Foundation Type ◽  
Penetration Tests

In this paper, a study has been carried out to estimate the ultimate capacities of concrete circular piles which are used as foundation type due to reasons such as poor ground conditions, seismicity, high or irregular loads etc. by field tests. Two cone penetration tests (CPTU), which measure the pore water pressures on alluvial soils of the Adapazarı plain, were conducted at the same locations with drillings which SPT tests were carried out. Ultimate capacities of a single pile with a specific geometry were determined by the methods proposed in the literature by using the data obtained from SPT and CPT field tests at both points. According to this, it is concluded that pile capacities can give very different results even in short distances in regions which offer sudden layer changes in horizontal and vertical. Disadvantages of the SPT test in practice compared to CPT have been shown to cause also different values of pile capacities.

Correlation of Cone Penetration Tests and Undrained Shear Strength in Alluvial Soils in the Humberside Area

1986 ◽  
Vol 2 (1) ◽  
pp. 213-217
Author(s):  
H. Erwig
Keyword(s):  
Site Investigation ◽  
Soil Conditions ◽  
Alluvial Soils ◽  
Thin Wall ◽  
Test Results ◽  
Cone Penetration ◽  
Cone Penetration Tests ◽  
Laboratory Test Results ◽  
Penetration Tests ◽  
Undrained Shear

AbstractAn intensive site investigation consisting of electric cone penetration tests, vane tests, Delft sampling and thin wall sampling holes has been carried out in soft alluvial soils in the Humberside area. This programme facilitated a correlation to be made between static cone end resistance with the undrained shear strengths obtained from the vane testing and laboratory test results. A discussion is presented on the various cone correlation factors (Nk) obtained and these results are compared to the cone factors established by others in similar soil conditions elsewhere.

Static Electric Cone Penetration Testing in Shallow Water

1986 ◽  
Vol 2 (1) ◽  
pp. 113-118
Author(s):  
C. H. Adam
Keyword(s):  
Water Depth ◽  
Cost Savings ◽  
Soil Conditions ◽  
Shallow Waters ◽  
Cone Penetration ◽  
Inland Waterways ◽  
Fine Grained ◽  
Cone Penetration Tests ◽  
Cone Penetration Testing ◽  
Recent Developments

AbstractThis paper describes the methods available to perform static electric cone penetration tests (CPT's) in shallow waters. It refers to both the coastal environment and inland waterways up to a water depth of around 25 to 30 m.Whilst the benefits of the speed of CPT's over water are reduced, compared with testing on land, the technique is still much quicker than conventional boring and sampling methods and offers significant cost savings. One of the other main advantages is the quality and accuracy of the information obtained particularly in submerged fine grained granular soils.There are a number of techniques which can be used to perform CPT's in shallow waters. These include detached CPT rigs mounted on small jack-up barges, fixed platforms and floating barges and seabed ballast block systems. The most suitable technique depends on a number of factors including water depth, site exposure, tidal conditions and seabed soil conditions.The cone design, testing methods and interpretation of CPT data are discussed briefly. Particular reference is made to recent developments in the use of the piezocone and other sensors.

Prediction of pile shaft resistance using cone penetration tests (CPTs)

2012 ◽  
Vol 45 ◽  
pp. 74-82 ◽  
Author(s):  
Mohammad Hassan Baziar ◽  
Armin Kashkooli ◽  
Alireza Saeedi-Azizkandi
Keyword(s):  
Cone Penetration ◽  
Shaft Resistance ◽  
Pile Shaft ◽  
Cone Penetration Tests ◽  
Penetration Tests

scholarly journals Comparison of Selected Terramechanical Test Procedures and Cartographic Indices to Predict Rutting Caused by Machine Traffic during a Cut-to-Length Thinning Operation

Forests ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 113
Author(s):  
Marian Schönauer ◽  
Stephan Hoffmann ◽  
Joachim Maack ◽  
Martin Jansen ◽  
Dirk Jaeger
Keyword(s):  
Shear Strength ◽  
Penetration Depth ◽  
Sustainable Forest Management ◽  
Operating Conditions ◽  
Soil Conditions ◽  
Cone Penetration ◽  
Topographic Wetness Index ◽  
Mixed Stands ◽  
Thinning Operation ◽  
Cone Index

Timber harvesting operations using heavy forest machinery frequently results in severe soil compaction and displacement, threatening sustainable forest management. An accurate prediction of trafficability, considering actual operating conditions, minimizes these impacts and can be facilitated by various predictive tools. Within this study, we validated the accuracy of four terramechanical parameters, including Cone Index (MPa, Penetrologger), penetration depth (cm, Penetrologger), cone penetration (cm blow−1, dual-mass dynamic cone penetrometer) and shear strength (kPa, vane meter), and additionally two cartographic indices (topographic wetness index and depth-to-water). Measurements applying the four terramechanical approaches were performed at 47 transects along newly assigned machine operating trails in two broadleaved dominated mixed stands. After the CTL thinning operation was completed, measurement results and cartographic indices were correlated against rut depth. Under the rather dry soil conditions (29 ± 9 vol%), total rut depth ranged between 2.2 and 11.6 cm, and was clearly predicted by rut depth after a single pass of the harvester, which was used for further validations. The results indicated the easy-to-measure penetration depth as the most accurate approach to predict rut depth, considering coefficients of correlation (rP = 0.44). Moreover, cone penetration (rP = 0.34) provided reliable results. Surprisingly, no response between rut depth and Cone Index was observed, although it is commonly used to assess trafficability. The relatively low moisture conditions probably inhibited a correlation between rutting and moisture content. Consistently, cartographic indices could not be used to predict rutting. Rut depth after the harvester pass was a reliable predictor for total rut depth after 2–5 passes (rP = 0.50). Rarely used parameters, such as cone penetration or shear strength, outcompeted the highly reputed Cone Index, emphasizing further investigations of applied tools.

scholarly journals Using CPTs to derive thermal properties of soil

2020 ◽  
Vol 205 ◽  
pp. 04005
Author(s):  
Philip J. Vardon ◽  
Joek Peuchen
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Laboratory Tests ◽  
Field Investigation ◽  
Volumetric Heat Capacity ◽  
Cone Penetration ◽  
Cone Penetration Tests ◽  
Penetration Tests ◽  
Properties Of Soil

A method of utilizing cone penetration tests (CPTs) is presented which gives continuous profiles of both the in situ thermal conductivity and volumetric heat capacity, along with the in situ temperature, for the upper tens of meters of the ground. Correlations from standard CPT results (cone resistance, sleeve friction and pore pressure) are utilized for both thermal conductivity and volumetric heat capacity for saturated soil. These, in conjunction with point-wise thermal conductivity and in situ temperature results using a Thermal CPT (T-CPT), allow accurate continuous profiles to be derived. The CPT-based method is shown via a field investigation supported by laboratory tests to give accurate and robust results.

scholarly journals The architecture of the Kattendijk Formation and the implications on the early Pliocene depositional evolution of the southern margin of the North Sea Basin

2020 ◽  
Vol 23 (3-4) ◽  
Author(s):  
Jef DECKERS ◽  
Stephen LOUWYE
Keyword(s):  
Cone Penetration ◽  
Early Pliocene ◽  
Cone Penetration Tests ◽  
The North ◽  
Lower Oligocene ◽  
Deep Incision ◽  
The North Sea ◽  
Depositional Evolution ◽  
Penetration Tests ◽  
East West

An east-west correlation profile through the upper Neogene succession north of Antwerp, based on cone penetration tests, reveals the architecture of the lower Pliocene Kattendijk Formation. It shows a basal incision of the Kattendijk Formation down to 20 m in Miocene sands and locally even Lower Oligocene clays. The incision is part of a much larger gully system in the region at the base of the Kattendijk Formation. The strongest gully incision is observed along the western profile, and coincides with increases in the thickness of the Kattendijk Formation from its typical four to six meters thickness in the east towards a maximum of 15 m in the west. Correlations show that this additional thickness represents a separate sequence of the Kattendijk Formation that first filled the deepest part of the gully prior to being transgressed and covered by the second sequence deposited in a larger gully system. Both sequences of the Kattendijk Formation have basal transgressive layers, and are lithologically identical. Initial, deep incision at the base of the Kattendijk Formation might have been the result of the constriction of early Pliocene tidal currents that invaded and expanded fluvial or estuarine gullies that had developed during the latest Miocene sea-level low. A similar mechanism had been proposed for the development of late Miocene gully system at the base of the Diest Formation further southeast in northern Belgium. As the wider area was transgressed and covered by the second sequence of the Kattendijk Formation, flow constriction ended, currents weakened and gully incisions were reduced in size.

Sign in / Sign up

Export Citation Format

Share Document