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In the paper an elastoplastic FEM models for jet-grouting pile soil system are proposed. An real interlace zone around the jet-grouting core is introduced. All zones are modelled using the Coulomb-Mohr's constitutive laws. The most important task undertaken in the paper is parametric evaluating for soil, interface zone and jet-grouting core. The parameters for the soil and the jetgrouting core should...
In our paper we estimated strain state in anisotropic, consolidating halfspace, caused by the sources of pressures in liquid. We found the solution using the techniques of integral transformations obtaining analytical dependencies of soil settlement on intensities of the source acting and the parameters characterising anisotropy. We illustrated the obtained results with an example and a plot of settlement...
Cement-bentonite walls are use as vertical cut-off bariers to allow containment of liquids in the ground. Cement-bentonite slurries support the trench during excavation and then self harden in-situ. The cut-off walls were built around the “Radiowo” landfill in Warsaw. MULAT 1.4, a finite element modeling program, was used to predict the effect of the wall on groundwater regime of the area. This paper...
The paper concerns identification of parameters of one-surface elasto-plastic model of clay with anisotropic hardening law by means of simple tests in triaxial apparatus. The calibration process consists of evaluation of modified Cam-clay parameters (λ, κ, M i G) that represent normal consolidation states as well as additional parameters (C, μ) of Gryczmański’s model characterising overconsolidation...
In this paper was done the loading test results surway of injected micropiles and "jet grouting"s piles. These loading tests have been done on the structure realized by "Geoservice" Company from Wrocław. On the basis of the received results, the axial stiffness of the piles was described and the measured settlements were compared with the analytical solutions.
This paper presents some results of research carried out with new CPT device - dilatocone. The computed values of GD modulus (eq. 4) were compared with the given M modulus values, obtained from DMT (fig. 6). The statistical analysis of obtained trends yields the final equations to compute the constrained moduluses from DCPT (eq. 6 and 7). The comparison of computed MDCPT values with „the best estimated”...
This paper presents comparison of analytical and numerical methods for the slopes stability calculation of the load embankments. The limit equilibrium methods like Fellenius’, Bishop’s and Janbu’s method, as well as the numerical method - the finite element analysis were showed. Mathematical and mechanical aspect of the methods with several examples of estimation was also presented and discussed in...
The investigations presented in this paper concern the natural water content changes in expansive clay, caused by group of deciduous trees. The research work was conducted in experimental field of the Geotechnics Dept, of University of Technology and Agriculture in Bydgoszcz. The process of renovation of natural water content in background during few years after trees removing. Analytical characteristic...
In the paper the results of investigations on shearing strength of colliery spoils are presented. Tests were carried out using triaxial and shear box apparatuses on the material passing by sieve 40 mm. The samples teste dintriaxial apparatus had dimensions of 15,0 cm in diameter and 30,0 cm in height. Shearing strength parameters were determined for total and effective stresses using differential...
The paper comprises a comparison of some geotechnical parameters of unburt colliery spoils from Anna Coal Mine after various time of depositing on the dumping ground i. e. 0,5 year, 2-years and 30-years. Investigations concerned petrographic composition, grain size distribution, natural moisture content, optimum moisture content and maximum dry density, specific gravity and shearing strength. It was...
Mineral seaing are common use facilities for protection of waste landfills and contaminated sites. Some times the sealing have contact with petroleum products, which may influence the hydraulic conductivity and may result in partial or complete reduction of the efficiency of sealing system. This paper presents the results of a laboratory testing program carried out to determine the influence of petroleum...
Several methods for calculation of bearing capacity of piles, based on the CPT test, are briefly discussed. An example results calculation for driven Vibro-Fundex piles are showed.
In the paper results of soil permeability determined in permeability coefficient apparatus and with empirical formulas were presented. In experiments two clayey gravels with the same grain size distribution, but different grain shape were used. Some random selected particles from fraction 10-20mm of each soil were measured. For these particles the index of angularity was determined. The index was...
The design, operation and remediation works of sanitary landfills involve a varity of geotechnical problems. The determination of mechanical properties (shear strength, compressibility) is necessary in order to perform even basic analysis. The paper presents the in situ tests performed on two old large landfills localized nearby to Warsaw, i.c. Radiowo and Łubna. The test purposes were the determination...
The paper presents results of investigations carried out on compaction ability of colliery spoils from Sośnica mine. Laboratory tests were carried out in semi-size and standard Proctor apparatuses. Aim of the project was determination the influence of choosen factors on compation parameters and their usability for engineering purposes.
This paper discusses the problem of assessment of pile groups settlement under axial loading. Special emphasis is placed on use of the analytical methods based on theory. Various calculation methods of pile group settlement are presented. A „hybrid” method is described more detailed. There are presented results of calculations with the help of own computer program. The influence of various parameters...
The paper presents an example of in situ testing to evaluate the geotechnical conditions performed for the organic subsoil of Antoniny embankment. The results obtained from cone penetration tests and dilatometer tests are presented. Results of cone penetration tests and dilatometer tests were compared with the laboratory test results. From an analysis of the results new factors to evaluate the preconsolidation...
The paper presents the concept o f strength parameters determination by the FEM, back-analysis method of trial loading of an embankment formed from mining waste. Elastic-ideally plastic Coulomb-Mohr model equations used in the analysis have been presented. Emphasis was put on the crucial steps in consecutive stages of examinations.
This paper presents the results of in situ test performed by means of BAT system in cohesive soils and results of laboratory investigations carried out in order to estimate the relation between horizontal coefficient of hydraulic conductivity kh and water saturation of fine-grained soils. Values of kh determined by BAT tests for pliocene clay from Warsaw were compared with the corresponding values...
The paper presents vertical distribution of temperature in 21-meter height level of the air. Time of appearance and disappearance of frost, rapidity of changes and vertical range of frost level were stated. Results presented in the paper refer to frost caused strong radiation and for the nights with poor radiation and stronger wind velocity separately.