Wyniki wyszukiwania - BazTech

1

Observation Method in the Control of Stacker Capacity Under Landslide Hazard – A Case Study

Bąk Miłosz, Bagińska Irena

Studia Geotechnica et Mechanica

|

2022

|

Vol. 44, nr 3

239--251

EN

The article presents both an application and the purpose of the observation method in the control of stacker capacity. It lists the types of the measured (observed) quantities, which serve as a basis for the observation method. It also describes the procedure of the method and discusses its individual steps. It further provides examples of applying the method in defining the capacity levels of a stacking machine ZGOT-11500, based on the recorded surface and subsurface soil displacement values. The article also offers the increment values and speeds for the individual parameters, which serve as a warning against deterioration of the geotechnical condition of the soil. Knowledge of the relationships between the parameters that describe soil deformation and the required defined stacker capacity may serve as a basis for further research and experiments on the observation method, which may increase the safety of stacking operations. The analysis was based on the results of geotechnical and geodetic measurements, as well as on the operating parameters of the stacker, acquired over a period of 5 months.

2

Rekultywacja terenów zdegradowanych w wyniku odkrywkowej eksploatacji kruszyw budowlanych

Bajorek G., Kiernia-Hnat M., Kokoszka W., Skrzypczak I.

Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska

|

2012

|

z. 59, nr 2/II/I

39-46

PL

Ochrona środowiska staje się jednym z czynników determinujących produkcję kruszyw budowlanych, a rekultywacja terenów zdegradowanych w wyniku odkrywkowej eksploatacji kruszyw naturalnych stała się jednym z głównym czynników warunkujących wydobycie tego materiału budowlanego. Dobrze zrekultywowany obszar może podnieść walory krajobrazowe regionu i przyczynić się do wzrostu atrakcyjności turystycznej. Aspekty środowiskowe oraz rekultywacja terenów zdegradowanych przy produkcji kruszyw budowlanych została omówiona na przykładzie jednego z producentów tego materiału na terenie Podkarpacia.

EN

Environment protection is important factor influencing production of aggregates for civil engineering needs. Reclamation of areas degraded by open-cast exploitation of natural aggregates became one of the main elements conditioning mining of this building material. Properly reclaimed area can rise natural, landscape values and it can bring adventages for tourist attractiveness of the region. Environmental aspects and reclamation of areas degraded due to aggregateproduction have been presented by means of example of the one selected producer from Podkarpacie region.

3

Rozwój osuwiska 22S w najgłębszej części kopalni Bełchatów

Czarnecki L., Goździk J.

Przegląd Geologiczny

|

2008

|

Vol. 56, nr 2

150-157

EN

The open-cast mine at Bełchatów is one of the deepest in the Central Europe. Landslides are there the main geotechnical hazard. The principal factors causing landslides in the mine are: complicated tectonic setting in the Kleszczów Graben, high lithological variability and the considerable depth of the excavation (over 200m). Landslide 22S is one of the biggest in the mine. It is situated at the SE corner of the so-called "second-order graben", where seam exploitation reaches 280m in depth. In this corner there are a set of faults forming a step-like pattern and alluvial sandy cone splitting the brown coal seam. The result is that layers are inclined to the open-cast central axis. There is a clay layer near the bottom of the brown coal seam inclined in the same direction Analyses of these factors enabled the landslide hazard zone to be established. In September 2003 slope movement monitoring began. During the first year slow horizontal displacement was recorded (1.4-5.0mm/day). In July 2004 the tempo of the displacement doubled and one of the inclinometers was truncated at the depths ca 20m. A simulating calculation showed that in order to prevent a slide a widening of a bench ca 400m is necessary, and in consequence restrict brown coal exploitation. It was decided not to widen a bench, but to intensify the monitoring and control process. On 17.02.2005 the speed of displacement rate exceeded 30mm/day. From the experiences with earlier landslides such a value was regarded as critical. The landslide hazard zone was closed and equipment was evacuated. On 2.03.2005 the tempo displacement attained 66mm/day (the alarm value of 50mm/day was crossed). On 15.03.2005 rapid mass movement occurred and the landslide 22S was formed; more exactly it was end of first stage of its development. The volume of the landslide was estimated to be 650 000m3. Protection works were undertaken to restrain landslide progress. However an increase in the depth of an excavation may result in the possibility of a landslide, and an intensive monitoring of a displacement in the hazard zone was ordered. During the first half-year after the first stage of the landslide 22S, no displacement was recorded. In July 2005 initiation of movement and fissures formation were observed. Per analogiam to the investigations of the development of the earlier landslides in the mine, a reactivation of the landslide 22S was expected at the end of 2005. On 4.12.2005 the second stage of the landslide occurred. After two stages the landslide volume reached ca 1 million m3. Site-specific geological conditions and the great depth of the Bełchatów mine excavation result in the landslide development having some peculiar features, and an investigation of them provided important pointers for prognosis hazard of the slope instability.