Deformation Monitoring Solutions First Monitoring Project in Slovenia

Transcription

1 Deformation Monitoring Solutions First Monitoring Project in Slovenia Leica Tour 2009 Slovenia

2 The Team University of Ljubljana, Faculty of Natural Sciences and Engineering, Chair for Mine Surveying and Applied Geophysics Marmor Sežana Geoservis 2 2

3 What do we monitor? GMX1 GMX3 GMX2 ca. 60 m Entrance Quarry Lipica II Monitoring station GMX2 above the entrance to the underground quarry 3 3

4 Site Description Open quarry Underground quarry Položaj referenčne točke GRS1 Monitoring stations GMX1, GMX2, GMX3 located on the edge of the hole GMX1 GMX2 gmx1 gmx2 GRS1 gmx3 GMX3 4 4

5 Characteristics of the Terrain Compact material with lots of cracks Caves and caverns Effects of freezing, erosion and temperature extensions Possible slides, breakages of rocks on the edge of the hole Crack above the quarry near GMX2 5 5

6 What to measure? Dual-axis inclination X, Y 3D displacements Motivation Automatic measurements 24/7 Detection of movements in real-time Determination of correlation with other events (weather, temp, blasting) 6 6

7 Why? Collecting experiences in monitoring Finding how anthropogenic activities influence environment (surface) Safety of workers (Will it fall?) For this rock it was planned to establish some kind of monitoring 150 ton heavy rock under question 7 7

8 Leica Deformation Monitoring Sensors and Software Solutions 8 8

9 Equippment Monitoring station GMX Leica GMX901 single frequency GPS receiver Nivel 210 tilt sensor WiFi directional antenna Wireless Device Server 12 V power supply 9 9

10 Scheme of the Equippment Leica AX1202 GG Leica GMX901 Leica GMX902GG External omni WiFi antenna External directional WiFi antenna Internet Wireless Access Point Wireless Device Server Leica Nivel V UPS 12 V supply Accu 220 V Monitoring station GMX1 12 V supply Accu Reference station GRS1 Monitoring station GMX2 Monitoring station GMX

11 In Operation 1/5 Leica GNSS Spider Graphical view of GPS/GNSS stations Background image Satellite status Watch view with messages Computed baselines 11 11

12 In Operation 2/5 Leica GNSS Spider Satellite status Raw data status Interruptions, delays, missing data (due to communication) 12 12

13 In Operation 3/5 Leica GNSS Spider PP Positioning kernel Coordinates of postprocessed points incl. coordinate quality Spider results are fed directly to GeoMoS 13 13

14 In Operation 4/5 Leica GeoMoS Sensor configuration and management (Spider, Nivel) Logging of measured data Processing and recording Alarming and Messaging 14 14

15 In Operation 5/5 Leica GeoMoS Presentation of data (graphs, tables) 15 15

16 Results: movements btw Detected movements GMX1 = 1 mm GMX2 = 7 mm GMX3 = 1 mm Trend analysis GMX1 GMX2 5 mm 16 16

17 Results: Decision (point GMX2 blasted away) Before... After

18 Professionals Comments Even we haven t started monitoring primariliy for security reasons we quickly realised this benefit, too. One large and heavy block of stone was all the time under question. Will it fall? Position and tilt measurements on this block gave us the direct view of what is going on. In only 3 months it was evident that it is moving. It moved for 7 mm. Maybe it looks not much, but it was clearly evident it is moving. Based on the measurements and our experiences we decided to move equippment from point GMX2 and blast the rock away. When rock was removed we were shocked. The whole 150 tons block was completelly separated from other material and way just slightly leant against the slope. Prof. Dr. Milivoj Vulić Project Leader Of course, we were happy for security reasons in the first place. But we were happy with financial aspect as well. If we would do classical onetime researches for only this rock, it would cost >20% of the whole realtime autonomous monitoring system which we established (and which will work for years, and for 3 points). And also classical geological monitorng would do harm for healty rock, which is not the case in autonomous geodetic monitoring. Andrej Kos, Marmor Sežana Technical Manager 18 18

19 Conclusion Benefits Safety of workers in mine Remote access to all the data from anywhere in the world and at any time Possibility to find correlations with other events (e.g. rain, temperature, blasting, quakes) Immediate display of measured values Because we know first what happend, we react the first Saves lifes and money 19 19

20 Geoservis, d.o.o. Litijska cesta 45 SI 1000 Ljubljana Tel.: (01) Fax: (01) Internet: E-pošta: