Górnictwo i Geoinżynieria
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ISSN 1732-6702
Issue Date
2008
Volume
R. 32
Number
Nr 2
Description
Journal Volume
Górnictwo i Geoinżynieria
R. 32 (2008)
Projects
Pages
Articles
Niejednorodność ośrodka gruntowego w kinematycznej analizie stateczności zboczy
(2008) Bagińska, Irena; Izbicki, Ryszard Jerzy
Previous methods including the non-homogeneous soil in kinematic analysis of the stability of slopes are shown in the paper. The proposed computable algorithm including stratification of the soil in the generalized Kinematic Element Method is presented. The change of the critical high of the stratified slope with variable line demarcating the different soils is analyzed. The results of the numerical analysis are graphically illustrated
Problemy analizy stateczności skarp nasypów kolejowych
(2008) Batog, Andrzej; Hawrysz, Maciej
In the paper the problems of the slope stability analysis in case of the railroad embankments were presented. There was outlined the current design approaches and codes did not consider the scale of dynamic effects which will appear after the train's speed increase to 160 km/h and over. The design procedure of load determination caused by the trains running at the speed 120 km/h and over was presented and the appropriate design approach for slope stability analysis for those speeds was proposed.
Skuteczność odwodnienia wgłębnego metodą wiertniczą przy stabilizacji osuwisk
(2008) Bosak, Jacek; Bosak, Marek; Michalski, Tomasz
For already twelve years, authors, use landslides deep dewatering drilling method. Hereby, they would like to present its efficiency basing on some examples: Koronowo, Uherce Mineralne, Korytniki, Tyrawa Wołoska, Jarosław. Its main advantages are: water be interception before reaches the sliding area and executing dewatering works without negative influence on road dams and road traffic. Additionally, the sliding surface and colluviums are being dewatered. Method range is limited by the drilling technology only. Authors were installing horizontal drainages up to the length of 40 m. Drainage pipes being used have the specific construction: flexibility, high permeability (over 10%) and increase tensile strength. Entire problem is shown with the hydrogeology of the landslides area background. Authors are concluding, that using described technology, additional retaining structures are needed only for the road pavement restoration purpose and give additional safety factor. Each example project shows such structures.
Uproszczona analiza stateczności pionowej szczeliny w gruncie
(2008) Brząkała, Włodzimierz; Gorska, Karolina
The paper presents an engineering method of the trench stability analysis basing on the three-dimensional limit equilibrium and comparing results with an elasto-plastic model. A short review of stability analyses is presented focusing on a conclusion that the third dimension (the length of the trench section) can not be neglected. The shape of the wedge for the stability calculations is composed of pyramids and prisms such that minimize the value of a factor of safety. Five cases are investigated depending on positions of the sliding zone and ground water level. The factor of safety FS for the trench of the depth H, is the ratio between sustaining hydrostatic slurry pressure Ps and effective horizontal ground pressure Ph acting with a hydrostatic water pressure Pw. Effective lateral ground pressure (Ph) is found making use of the limit force equilibrium for the sliding wedge. One example deals with a searching of the extreme value of angle 0 (versus depth H) which is the inclination of slip surface that minimizes the value of FS. Such critical values of 0 are found to be slightly greater than pi/4 + phi/2. Furthermore, the values of factors of safety FS for the simplified calculations and the ones yielding from the numerical analysis (elasto-plastic) are compared.
Analiza stateczności skarp z gruntu zbrojonego
(2008) Cała, Marek; Kowalski, Michał
This paper deals with the reinforced slope stability analysis. It was assumed that soil profile of a slope consists of two layers. The strong soil (soft rock) is covered by weak soil (or weathered rock). Such slope geology determines the way of soil reinforcement. Usually nails or anchors are applied for to provide the overall stability of the slope. However the face reinforcement of soft soil must also be used. Generally, slope stability analysis for such case, is limited to nails or anchors interacting with the soil. The face reinforcement is usually not taken under consideration. The way of reinforcing the slope with pre-tensioned nails connected to wire mesh facing is described and applied. The nails are modeled by rockbolt elements, which can rupture. The wire mesh is modeled as beam element with resistance only in tension and connected to the soil by »unglued« interface. Factor of safety (FS) of a slope is calculated with shear strength reduction technique. Nails pre-tension were obtained by user-written FISH function. A series of FS calculations were performed to show, the wire mesh facing is not only local stability protection, but can significantly increase the overall slope stability.