The paper discusses the parameters of non-cohesive soils’ compaction and methods of their determination and the relationships between them. For sands and coarse-grained soils there are presented the relationship between the following parameters: maximum dry density of soil from compaction test (ρds) and optimum moisture (wopt) – standard and modified Proctor method, uniformity coefficient (CU), grain diameter (d10), maximum grain diameter (dmax) and weighted average grain diameter (dśr.waż.), minimum and maximum dry density of soil (ρdmin and ρdmax).

In this paper deformation parameters of organic soil gyttja, were taken into the consideration. The organic soils are usually located in the river valleys and as a subsoil under engineering constructions, e.g. in the city. Gyttja’s, because of their large compressibility, small shear strength and difficult to evaluate permeability create a problem during calculating and modeling the foundation of the engineering construction. The stress-strain relationship in gyttja is hard to predict, because of the non-linear deformation parameters and variability of strength parameters. Therefore, it is very important to properly determine deformation parameters of organic soils on the basis of in situ and laboratory tests. In this paper, the laboratory test results, obtained on soil samples type A, and in situ dilatometer Marchetti test are presented. Oedometric modulus obtained from laboratory tests is verified with the in situ results. Determination of deformation parameters of gyttja, based on in situ and laboratory tests, lets to predict stress-strain characteristics for safety and failure-free work of the designed engineering construction.

Bearing capacity of working platform is determined in a simmilar way as for layered subsoil, where the upper layer from cohesionless soil is resting on soft cohesive strata. DMT test was used to estimate soil strength parameters (angle of internal friction for the upper layer and undrained shear strength of soft subsoil) and constrained modulus MDMT. The characteristic soil parameters were determined with five dilatometer tests on trial field. Different estimation methods of characteristic value of soil parameters were considered.

The aim of this study was to analyse the results of comparative tests on compaction parameters – maximum bulk density of dry soil (ρds) and optimum moisture (wopt), by Polish standards of previous edition: PN-88/B-04481:1988 and a new edition: PN-EN 13286-2:2010. The study was performed on two non-cohesive, uniform soils sandy gravel Po (fgrSa) and medium sand Ps (fgrmgrSa) with the use of four methods (I, II, III, IV) in compliance with PN-88/B-04481:1988 and four other methods (A+A, A+B, B+A, B+B) in compliance with EN 13286-2:2010. The maximum volume of the bulk density of dry soil (ρds) obtained by the procedures under both standards differ little from each other: by about 2.0–4.0% in sandy gravel and about 1.6–2.1% in medium sand. The values of optimum moisture (wopt) are not subject to any clear patterns.

The Berliner wall with 1 level of ground anchors was designed to ensure the excavation stability. A 8 to 9 m deep excavation was carried out for residential building on the street Przy Bażantarni in Warsaw. The ground has been identified homogeneous ground conditions occur mainly cohesive soils with a very high shear strength. The loads in the 3 ground anchors were measured throughout the period of their work in the construction. Back analysis was performed to determine the soil parameters reflecting the work of retaining structure. For the purposes of the analysis laboratory triaxial tests was conducted with drainage of water from the pores of the soil (TXCID) on samples taken when digging the trench. Calculations were made using the construction module of ground reaction. The calculation results are compared with the measurement results. Based on the results of the analyzes and the results of the measurement of forces in anchor made recommendations regarding the selection of parameters for the design of retaining structures similar ground conditions.

The paper presents results of investigations of properties (consistency, density, compressive strength, flexural strength, tensile strength) of ordinary concretes and concretes containing steel fibers and fly ashes. To make the samples, the Portland cement CEM I 32.5R; 42.5R; 52.5R was used. Each type of cement, was used to prepare concrete with steel fibers in the quantity of 0.7% of cement mass as well as with steel fibers in the quantity of 0.7% and fly ash in the quantity of 5% of cement mass. After the tests, it was concluded that the admixture of steel fibers and fly ash improves the features connected with flexural and tensile strength but the compressive strength decreases.

The influence of the foundation pad reinforcement on bearing capacity and stiffness increasing was described in the paper. The procedure of designing the reinforced foundation pad according to EBGEO was given. The calculations for chosen strip foundation of a two-storey administration building, constructed on organic ground with thickness of 3 m, were shown. Pads with different width, determined by the value of stress distribution angle β = 0°, 30° and 45°, reinforced by four layers of geogrid were designed based on EBGEO. Foundation pad reinforcement affects the subgrade bearing capacity, and the impact is the greatest in the case of pad with width equalled to strip foundation width. The stiffness pad increase, calculated according to EBGEO, is mainly due to pad loading and strength of the geosynthetics.

The article attempts to determine the changes in the modulus of compressibility of consolidated organic soil on the bases of the known final settlement of the overloaded embankment and the stresses that it exerts to subsoil. The presented model is based on the principle of superposition in relation to the impact of all calculation plots, into which the embankment was divided. Basing on the theory of Boussinesq, the stresses at the embankment-subsoil contact area, and the resulting settlement were determined. On the basis of the model, the modul of compressibility for the real overloading embankment were determined.

The article presents the possibility of using numerical analysis in the context of the deep foundations of buildings in the Warsaw area. Complicated ground conditions in the Warsaw area were discussed briefly. The paper proposes a guidelines for construction of numerical models and numerical calculations. Many factors affecting on the numerical calculations results were presented. The necessity of calibration performing in relation to the numerical models was discussed. Based on the presented examples and analyzes, the final conclusions were formulated.

In both site engineering practice and design practice correlation between geotechnical parameters are desirable beyond doubt. The paper presents site comparative tests based on Light Falling Weight Deflectometer (LFWD) and Plate Load Test (VSS) with relationship between dynamic deformation modulus EVd and primary and secondary static deformation modulus EV1, EV2. Correlation between parameters is not binary procedure, then it is observed different levels of accuracy. It is proved that dynamic deformation modulus is better correlated with secondary static modulus. That is because soil is in another state in primary and secondary loading.

The earthfill dam Białobrzegi is one of eight side dams of Zalew Zegrzyński. Initially, the dam was drained by a drainaged pipe and discharge into a ditch. Difficult hydrogeological conditions of foundation structures resulted in suffusion and hydraulic break in a sand layer. After the renovation, made in the mid-90s, polypropylene and polyethylene nonwoven geotextiles were used in the drainage system. The nonwoven geotextiles used in drainage applications are vulnerable to physical and chemical clogging process. Clogging reduces effectiveness of the synthetic filter layers. The paper presents the research methodology and the results of analyses obtained from the laboratory tests of water permeability characteristic normal to the plane of nonwoven geotextiles after 22 years of exploitation in the earthfill dam Białobrzegi. Also, the parameters of unworn and after 7 years of exploitation obtained earlier were compared with the research results.

Currently very often, the execution of the foundations of buildings requires to perform of deep excavations. Uncontrolled groundwater flow into the deep foundation, leaks and, caused by them, internal erosion processes are among the keys threats to the safety of deep excavations and nearby buildings. The presence of these processes can generate significant additional construction costs of building. The most effective method of detection of leaks of deep excavations is thermal monitoring method. This method has been verified and successfully used for over twenty years in western Europe. In recent years, it is introduced into implementation in Poland. The paper shows firstly a comprehensive analysis of the uncontrolled groundwater flow into the deep foundation. The scheme of works performed to construct the slurry walls as well as typical causes of leakage were discussed. Secondly, the authors, basing on their professional experience present the basic issues concerning the thermal monitoring method and the possibilities of its using to leakage detection of deep excavation construction before its performing. Finally, an example of thermal monitoring method application for the detection of leaks of deep excavation construction of one of subway station in Europe is presented.

The aim of the study was to evaluate the effect of starch hydrolysates on the rheological properties of the cement paste. The Portland cement CEM I 42.5N and five types of dextrins were investigated. The study was conducted at two different water to cement ratios, i.e. 0.4 and 0.5. Rheometer determined values of the viscosity and shear stress in the cement paste, depending on shear rate, were used to determine the plastic viscosity and yield stress slurries, which were calculated using the selected mathematical models. Evaluated starch derivatives were analyzed for their suitability as modifiers of rheological parameters. The study revealed that the addition of starch hydrolysate results in a significant reduction of yield stress slurries, which in turn can lead to concrete mix liquefaction and mixing water reduction.

The analysis of influence of rainfall infiltration and lateral erosion of riverbank on slope stability is presented in the paper. Studied landslide is situated at the Flysch Carpathians (Bieśnik near Gorlice, Beskid Niski Mts.) and it was activated in 2010. Field and laboratory tests included land surveying measurements and determination of geotechnical parameters of soils. In the further part of work were done slope stability calculations, which included influence of infiltration process and erosion range at the toe of slope on stress state change within the slope. Tests revealed, that analyzed landslide originated in the area of the unfavorable geological conditions, where subsoil is composed of poorly permeable clays and schists of medium and high plasticity. In turn, the slope stability calculations have shown a significant and of a similar scope of the impact of rainfall and fluvial processes (lateral erosion) on stability of the analyzed slope.