Comparison of the results from static and dynamic penetration tests, in situ plate tests and laboratory compressibility tests

Abstract Currently, can be seen a new trend in engineering geological survey, where laboratory analysis are replaced by in situ testing methods, which are more efficient and cost effective, and time saving too. A regular engineering geological survey cannot be provided by simple core drillings, macroscopic description (sometimes very subjective), and then geotechnical parameters are established based on indicative standardized values or archive values from previous geotechnical standards. The engineering geological survey is trustworthy if is composed of laboratory and in-situ testing supplemented by indirect methods of testing, [1]. The prevalence of rotary core drilling for obtaining laboratory soil samples from various depths (every 1 to 3 m), cannot be a more enhanced as continues evaluation of strata and properties e.g. by CPT Piezocone (every 1 cm). Core drillings survey generally uses small amounts of soil samples, but this is resulting to a lower representation of the subsoil and underestimation of parameters. Higher amounts of soil samples make laboratory testing time-consuming and results from this testing can be influenced by the storage and processing of the soil samples. Preference for geotechnical surveys with in situ testing is therefore a more suitable option. In situ testing using static and dynamic penetration tests can be used as a supplement or as a replacement for the (traditional) methods of surveying.

Download Full-text

In Situ Study on Reinforced Effect of Silt by Ram-Compaction Gravel Pile with End Expansion

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.446-449.3428 ◽

2012 ◽

Vol 446-449 ◽

pp. 3428-3431

Author(s):

Chao Liang Ye ◽

Huai Ping Feng ◽

Yao Jun Liu

Keyword(s):

Static Load ◽

Load Test ◽

Silty Clay ◽

Heavy Duty ◽

Static Load Test ◽

Dynamic Penetration ◽

S Curve ◽

Gravel Pile ◽

Penetration Tests

Ram-compaction gravel pile with end expansion is widely adopted in the treatment of silty clay foundations. In this paper, the bearing properties of rammed gravel pile reinforced foundations and soil between piles were investigated by use of static load tests and heavy-duty dynamic penetration test. It is demonstrated that the settlement curves (P-S curve) of ram-compaction gravel pile with end expansion reinforced foundation and soil between piles were monotonic, without turning point being observed. With the increases of pile length, the bearing capacity of pile increases. According to the experimental results from heavy dynamic penetration tests and static load test, the strength of soil between piles is improved, which also have effects on the elimination of the uneven settlements. Comparison the results between heavy-duty dynamic penetration tests and over-heavy dynamic penetration tests shows that the later one is suitable on testing of the soil properties between piles. In addition, from in-situ measurements of uplift deformation of different depths, it is found that uplift behavior occurs with depth more than 0.5m, whit largest uplift value of 21cm. The result provides a reference for the design and construction of rammed gravel pile reinforced foundation.

Download Full-text

Using CPTs to derive thermal properties of soil

E3S Web of Conferences ◽

10.1051/e3sconf/202020504005 ◽

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.

Download Full-text

Mechanical parameters for Werra rock salt (Na1γ from Merkers): Comparison of the results from laboratory experiments, in situ measurements, and modelling.

Zeitschrift der Deutschen Geologischen Gesellschaft ◽

10.1127/zdgg/152/2001/77 ◽

2001 ◽

Vol 152 (1) ◽

pp. 77-98

Author(s):

Thomas Klügel ◽

Dietrich Simon ◽

Hans Harwardt

Keyword(s):

Rock Salt ◽

Laboratory Experiments ◽

In Situ Measurements ◽

Mechanical Parameters ◽

Comparison Of The Results

Download Full-text

PHASE FORMATION AND TEXTURE DEVELOPMENT IN AG-SHEATHED Bi, Pb(2223) TAPES STUDIED BY DIFFERENT IN-SITU AND EX-SITU DIFFRACTION TECHNIQUES

International Journal of Modern Physics B ◽

10.1142/s0217979200002788 ◽

2000 ◽

Vol 14 (25n27) ◽

pp. 2688-2693 ◽

Cited By ~ 4

Author(s):

E. GIANNINI ◽

E. BELLINGERI ◽

F. MARTI ◽

M. DHALLÉ ◽

V. HONKIMÄKI ◽

...

Keyword(s):

High Energy ◽

Texture Development ◽

Ex Situ ◽

X Ray Diffraction ◽

X Ray ◽

Scattering Geometry ◽

Reflection Geometry ◽

Comparison Of The Results ◽

In Situ Neutron Diffraction

In-situ and ex-situ high energy (80÷88 keV) X-Ray diffraction from a synchrotron radiation source were performed on multifilamentary Bi, Pb(2223)/Ag tapes using a transmission scattering geometry. Several thermo-mechanical procedures were compared, focusing mainly on the texture development of both Bi, Pb(2212) and Bi, Pb(2223) phases. The effect of the periodic pressing on the texture and on the critical current is elucidated. The texture development of the Bi, Pb(2212) phase prior to its transformation into Bi, Pb(2223) was directly observed in-situ at high temperature by using a dedicated high-energy X-ray compatible furnace and a high resolution Image Plate detector. A sharp increase of the Bi, Pb(2212) grain orientation along the [00l] direction was found to occur only above 750°C. Normal state transport measurements are in full agreement with the formation mechanism and with the texture development observed. A comparison of the results with the ones provided by in-situ neutron diffraction and standard low-energy XRD in a reflection geometry is presented.

Download Full-text

Prediction of the bearing capacity of bored piles from dynamic penetration tests

International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts ◽

10.1016/0148-9062(91)93619-h ◽

1991 ◽

Vol 28 (1) ◽

pp. A48

Keyword(s):

Bearing Capacity ◽

Dynamic Penetration ◽

Bored Piles ◽

Penetration Tests

Download Full-text

Interpretation of cone penetration tests. Part II: Clay

Canadian Geotechnical Journal ◽

10.1139/t83-079 ◽

1983 ◽

Vol 20 (4) ◽

pp. 734-745 ◽

Cited By ~ 85

Author(s):

P. K. Robertson ◽

R. G. Campanella

Keyword(s):

Shear Strength ◽

Friction Angle ◽

Companion Paper ◽

Deformation Characteristics ◽

Cone Penetration ◽

Cone Penetration Tests ◽

Cone Penetration Testing ◽

Personal Experiences ◽

Penetration Tests

This paper is the second of two parts and presents a summarized work guide for practicing engineers for interpretation of parameters for undrained conditions during the cone penetration test such as, undrained shear strength, overconsolidation ratio, and deformation characteristics of clay. The advantages, use, and interpretation of the piezometer cone are also discussed. Factors that influence the interpretations are discussed and guidelines provided. The companion paper, Part I: Sand, considers drained conditions during the test and summarizes interpretation of parameters such as relative density, friction angle, and deformation characteristics of sand. The authors' personal experiences and current recommendations are included. Keywords: static cone penetration testing, in-situ, interpretation, shear strength, modulus, stress history, pore pressures, permeability, consolidation.

Download Full-text