Kamila Międlarz, Jakub Konkol and Lech Bałachowski
1.1 Aim of research
This research is focused on effective angle of internal friction and compares the results for the Vistula Marshlands muds and peats with similar soft soils. Effective shear strength parameters of the deltaic soils near Gdańsk are measured in drained and undrained triaxial compression tests and estimated with the Norwegian Institute of Technology (NTH) method using the Cone Penetration Tests (CPTU) sounding. The observed dilative-contractive soil behaviour is discussed taking into account the CPTU classification chart
Mehdi Missoum Benziane, Noureddine Della, Sidali Denine, Sedat Sert and Said Nouri
, 23 ] Experimental results from various tests
(direct shear, unconfined compression and triaxial compression) have confirmed that the efficiency of fiber treatment is highly dependent on the fiber concentration, on testing conditions (e.g., stress and strain levels, stress path and loading direction) and on a large number of variables related equally to the physical and dimensional characteristics of both fiber and sand matrix (e.g.,fiber and particle sizes and particle size distribution, particle shape and fiber surface, fiber/grain frictional properties
Antonio Mario Federico, Osvaldo Bottiglieri, Francesco Cafaro and Gaetano Elia
mass is a complex process requiring experimental investigation at different scales, also adopting a strategy of characterization based on physical modelling, [ 7 , 8 ] since element testing alone would not give results representative of the entire mass.
It should be noted that coal stockpiles are usually compacted by dozers, under water unsaturated conditions. Coal crushing in the top layers during compaction was observed to be the main cause of the appearance of fine grains (e.g., [ 9 ]): the resulting variation in particle size
distribution leads to the
Djamel Bouri, Abdallah Krim, Abdelkader Brahim and Ahmed Arab
a particular manner ([ 39 ], [ 40 ]). However, many researchers have mentioned that the physical nature of silty sand is entirely different from clean sand ([ 2 ], [ 26 ], [ 33 ], [ 34 ], [ 38 ], [ 41 ], [ 42 ], [ 43 ]). They have recognized that the undrained shear strength ( Sus ) response depends effectively on the void ratio as a state parameter. It is also anticipated that the global void ratio (e) cannot represent the amount of particle contacts in the sand-silt soil sample mixture. As the void ratio and the proportion of coarse-grained and fine-grained soil
parameters, even by means of the Mohr–Coulomb linearisation. The physical–mechanical parameters used for the rocks and the discontinuities of the geomechanical model are summarised in Table 2 .
Mechanical parameters of rocks and discontinuities (based on laboratory tests) of the geomechanical model.
AND “RED SOILS”
(Kg/m 3 )
ALTERED AND KARSTIC LIMESTONE from laboratory
Hala Hammadeh, Farzat Askifi, Andrzej Ubysz, Marek Maj and Amjad Zeno
Description of the Model
Experiments were conducted using a silo model similar to the real silo. A physical model of the silo was build, and the dimension of the model was defined in proportion to the real silo. In addition to that, the material flow was also modeled in order to have an accurate result that can be applied on the real silo. The dimensional analysis theory has been considered. Through a number of steps including determining the variable affecting the studied case, the dimension of the model was determined, and 1/10 was adopted as the chosen model scale, and
Joanna Hydzik-Wiśniewska, Anna Wilk, Łukasz Bednarek and Sebastian OIesiak
method of marking the indicator for material requires to conductit after four days of soaking, which simulates unfavourable conditions of water saturation. Unfortunately, the CBR test method is laborious and time consuming [ 22 ].
This article analyses the geotechnical and physicaltest results with particular consideration of CBR of mixtures of crushed aggregate assessed for their application in road construction as subgrade layer. An attempt was also made to find the correlation between CBR ratio and other physical properties. All aggregate tests were performed at
the object were excited kinematically, with the movement of the structure’s base interpreted as an input signal in the system, being short-term and irregular. It was assumed that the theoretical model, resulting from the physical model, is a discrete system with three degrees of freedom (see Fig. 1b ) This assumption is justified by the fact that the structure of the physical model is very similar to a shear building type, in relation to which only transverse (horizontal) vibrations are considered.
The slab-and-column model: (a) physical; (b
Scientific Publishers, PWN, Warszawa 1998, (in Polish).
 KOLASA M., Geotechnical properties of loesses near Kraków, Prace Geologiczne PAN, 18, 1963, 7-84, (in Polish).
 LUNNE T., ROBERTSON P.K., POWELL J.J.M., Cone Penetration Testing in geotechnical practice, Blackie Academic and Professional, London 1997.
 ŁANCZONT M., WOJTANOWICZ J., Peryglacial zonation of silt deposits in Poland, Annales UMCS, sec. B, 54, 1999, 41-48, (in Polish).
 MALINOWSKI J., Engineering geology investigation of loesses
Bottom ash from EC Gdańsk and dredged material taken from the mouth of The Vistula were mixed to form an engineering material used for dike construction. Mixtures with different bottom ash content were tested in laboratory to determine its basic physical and mechanical properties. The optimum bottom ash-dredged material mixture, built in the corps of the test dike, contains 70% of ash. The optimum bottom ash content in the mixture was chosen taking into account high internal friction angle, good compaction and reduced filtration coefficient. The maximum dry density of the mixtures was measured in Proctor test for the mixtures formed in laboratory and on samples taken from the test dike. Minimum and maximum void ratio were also determined.