Wyniki wyszukiwania - Biblioteka Nauki

1

Deterministic modelling of deformations as a tool for designing geodetic monitoring schemes

100%

Szostak-Chrzanowski A. , Chrzanowski A. , Bond J.

|

tom z. 1/82

337-344

EN

The design of geodetic deformation monitoring schemes requires decisions to be made regarding the optimal location, density, and accuracy of geodetic sensors and targets. All too often, however, the location of the instruments and accuracy of monitoring are decided upon without regard for the expected location and magnitude of the maximum deformations of the monitored object. This can lead to incorrect interpretations of the behavior of the investigated object. A more rigorous approach is to use deterministic (a-priori) modeling of expected displacements derived from the knowledge of the geometry of the object and its environment, causative factors (loads), properties of the material, and physical laws governing the stress-strain relationship. In order to demonstrate how deterministic modeling can be used to design a geodetic scheme for deformation monitoring, an open pit mine scenario was investigated. Finite element analysis was applied to the open pit mine to obtain a prediction model of deformations at various stages of the mine development.

2

The capability of terrestrial laser scanning for monitoring the displacement of high-rise buildings

86%

Pham T. D. , Pham Q. K. , Cao X. C. , Nguyen V. H. , Ngo S. C.

Inżynieria Mineralna

|

2021

|

tom no. 2

495--504

EN

Recently, terrestrial laser scanner (TLS) has been increasingly used to monitor of displacement of high-rise buildings. The main advantages of this technique are time-saving, higher point density, and higher accuracy in comparison with GPS and conventional methods. While TLS is ordinary worldwide, there has been no study of the capability of TLS in monitoring the displacement of high-rise buildings yet in Vietnam. The paper's goal is to build a procedure for displacement monitoring of high-rise buildings and assess the accuracy of TLS in this application. In the experiments, a scanned board with a 60 cm x 60 cm mounted on a moveable monument system is scanned by Faro Focus3D X130. A monitoring procedure using TLS is proposed, including three main stages: site investigation, data acquisition and processing, and displacement determination by the Cloud-to-Cloud method (C2C). As a result, the displacement of the scanned object between epochs is computed. In order to evaluate the accuracy, the estimated displacement using TLS is compared with the real displacement. The accuracy depends on scanning geometry, surface property, and point density conditions. Our results show that the accuracy of the estimated displacement is within ± 2 mm for buildings lower than 50 m of height. Thus, TLS completely meets the accuracy requirements of monitoring displacement in the Vietnam Standards of Engineering Surveying. With such outstanding performance, our workflow of using TLS could be applied to monitor the displacement of high-rise buildings in the reality of geodetic production in Vietnam.

3

Monitoring przemieszczeń terenu i obiektów budowlanych położonych na terenach górniczych metodami telemetrycznymi opracowanymi w KOTG, GiGG AGH Kraków

86%

Jaśkowski W.

|

tom T. 68, nr 8

76--82

PL

Monitoring przemieszczeń powierzchni terenów górniczych i obiektów na nim posadowionych jest coraz częściej stosowany przez zakłady górnicze. Wykorzystuje się w nim następujące techniki obserwacyjne: technikę satelitarną GPS, pochyłomierze elektroniczne, technikę laserową połączoną z komputerową detekcją wiązki laserowej, systemy telemetryczne z czujnikami rezystancyjnymi, strunowymi przymiarami elektronicznymi. W artykule przedstawiono stosowane przez Katedrę Ochrony Terenów Górniczych, Geoinformatyki i Geodezji Górniczej AGH Kraków urządzenia i technologie telemetryczne w monitoringu terenów górniczych i obiektów budowlanych. Większość przedstawionych w referacie urządzeń i technologii opiera się na autorskich rozwiązaniach pracowników Katedry.

EN

Monitoring of displacements of terrain surface and structures in mining areas is more and more frequently applied by mining companies. It involves the following techniques of measurements: GPS satellite technology, electronic tiltmeters, laser technique combined with computer detection of laser beam, telemetric systems with resistance sensors, wire electronic rules. The article presents telemetric devices and technologies used in monitoring of mining areas and buildings developed by the Chair of Mining Areas Protection, Geoinformatics and Mine Surveying of AGH UST in Kraków. Most of the presented devices and technologies are based on author’s solutions of the staff of the Chair.

4

Application of CCTV in geodesic monitoring of displacements

86%

Jóźwik M. , Jaśkowski W.

|

tom z. 1/82

123-127

5

On integration of multiple-source data in geodetic monitoring of structural displacements

86%

Prószyński W.

|

tom z. 1/82

275-285

6

Współczesna technologia skanowania laserowego 3D w monitorowaniu przemieszczeń i deformacji obiektów mostowych

72%

Karsznia K.

|

tom nr 1

32--35

PL

Do prawidłowej oceny stanu obiektu inżynierskiego stosuje się w coraz szerszym stopniu różne techniki pozyskiwania danych, które podlegają następnie integracji. Obecny stan technologii informatycznych oraz możliwości, które oferuje nam współczesna metrologia, geodezja czy inżynieria budowlana, bez wątpienia kształtują nowy sposób rozumienia tematyki monitoringu badanych obiektów.

7

Interconnection between monitoring and deterministic modeling of the behavior of large earth dams

72%

Szostak-Chrzanowski A. , Massiera M. , Chrzanowski A.

|

tom z. 1/82

345-351

EN

Monitoring of deformations, whether using geodetic or geotechnical instrumentation, besides providing a warning system in case of an abnormal behaviour of the dam, may be used as a tool for a verification of design parameters. By comparing results of monitoring measurements with a deterministic (a-priori) model of deformation, one may determine and explain causes of deformation in a case of unexpected behaviour of the investigated object and its surrounding. Thus, the role of monitoring becomes much broader than just the conventional determination of the status of the deformable object. On the other hand, a predicted behaviour of the dam may be used in designing the monitoring scheme, giving information on the magnitude and location of the expected maximum deformation parameters. In addition, with properly designed monitoring surveys, one may also determine the actual deformation mechanism. The discussed problems are illustrated by three types of earth dams located in California, USA, and in Quebec, Canada.