WSN in Prague metro. Martin Vaníček - CTU

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1 WSN in Prague metro Martin Vaníček - CTU

2 WSN installation in Prague - past Test site Near Dejvická metro station (~70m) 8 wireless nodes + Stargate gateway installed 5 nodes + Stargate in one ring 3 nodes along tunnel ~ 17m distance Linksys GPRS router for internet access next to Stargate Last issues Linksys router updated with new firmware to accept SMS for connect status and reconnect to solve problems with connection dropping Stargate stopped working, the WSN removed during January visit (also by Cambridge team) yesterday we found that power supply is faulty and not Stargate itself WSN in Prague Metro Bologna February 2008 Martin Vaníček

3 WSN installation in Prague - future Proposal: WSN will be installed in more locations (Nádraží Holešovice- Vltavská, I.P.Pavlova-Vyšehrad & Staroměstská-Můstek?), where real measurements will be done, in a setup proposed from test location WSN will be connected to real devices for monitoring inclinometers (developed in Cambridge) and Geokon crackmeters in order to start collecting measured data Internet Linksys / Stargate will be installed closer to the station (not more then 50m) The real installation will be done after testing period at the lab, where all necessary implementations for periodic data transfer from tunnel and process for remote management restart will be done WSN in Prague Metro Bologna February 2008 Martin Vaníček

4 WSN installation in Prague future 2 (based on yesterday s meeting) Proposal: WSN setup by Cambridge (Balloon gateway with X-mesh wireless data collection and communication protocol) will be installed on 1 real location in Prague WSN using Crossbow s implementation (Stargate Netbridge gateway with X-mesh protocol) will be installed on other real location (s) in Prague Metro Close co-operation between Cambridge and Prague teams on the X-mesh protocol implementation to be compatible and therefore comparable Unless required, the old system using Stargate and Surge protocol will not be installed in Prague, as the system become recently obsolete WSN in Prague Metro Bologna February 2008 Martin Vaníček

5 Thank you for your attention

6 Prague Metro Monitoring Section in km 18,725 Bologna Meeting 02/2008 Jan Záleský

7 Placement of tilt plates and convergence bolts Test area 51,7 47,6 Initial inclination of tilt plates Axe of to horizontal plane 2.05 plate to horizontal plane 25,4 09,8 Yellow points convergence bolts C 04,4 L 00,6

8 All results of tilt measurement 1,00 20,0 15,0 0,50 10,0 5,0 0, ,50 0,0-5,0-10,0-15,0-1,00-20,0-1, [mm/m] 2.02 [mm/m] 2.03 [mm/m] 2.04 [mm/m] 2.05_C [mm/m] 2.05_L [mm/m] Temp. in deg.c -25,0-30,0

9 Left / Right of the Rail 0,40 0,20 0, ,20-0,40-0,60-0,80-1,00 20,0 15,0 10,0 5,0 0,0-5,0-10,0-15,0-20,0-25,0-30, [mm/m] 2.04 [mm/m] Temp. in deg.c

10 Left / Right of the Tunnel Crown 1,00 0,80 0,60 0,40 0,20 0, ,20-0,40-0,60-0,80 20,0 15,0 10,0 5,0 0,0-5,0-10,0-15,0-20,0-25,0-30, [mm/m] 2.03 [mm/m] Temp. in deg.c

11 Plate at Bottom of the Tunnel 1,00 20,0 15,0 0,50 10,0 5,0 0, ,50 0,0-5,0-10,0-15,0-1,00-20,0-25,0-1,50-30,0 2.05_C [mm/m] 2.05_L [mm/m] Temp. in deg.c

12 Convergence monitoring Started: Z reading 17/01/08 1 st reading 08/02/08 No signifacant changes

13 Grant Agency of Czech Republic, Reg. Nr. 103/06/1257: RESEARCH ON UNDERGROUND STRUCTURES AGEING WITH EXPLOITATION OF MONITORING AND MICROMEASUREMENT SYSTEMS - AUXILIARY METHODS II Proposer: Prof. Ing. Ivan Vanicek, DrSc. Author of the report: RNDr. Jaromir Machacek, Ph.D. Czech Technical University in Prague

14 Research of underground structures ageing with exploitation of monitoring and micro-measurement systems AUXILIARY METHODS II - GA CR Reg. Nr. 103/06/1257: a) monitoring of time-development of selected lining parts dynamic behaviour changes under traffic loads (at monitoring profile on line C, rail Nr.2, kilometer spacing 18,725 of the Prague metro, near the Holesovice Station) - systematically performed, b) recording and processing of dynamic response accelerograms of reinforced concrete slab during the laboratory fatigue test (finished, data in processing), c) monitoring of fatigue failure time-development by means of examination of elastic waves spreading parameters (up to now not started because of procceding instalations, it will start next month).

15 a) MONITORING OF TIME-DEVELOPMENT CHANGES OF SELECTED LINING PARTS DYNAMIC BEHAVIOUR UNDER TRAFFIC LOADS at monitoring profile on line C, rail Nr.2, kilometer spacing 18,725 of the Prague metro, near the Holesovice Station.

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17 DATA ANALYSIS / TIME DOMAIN / DESCRIPTIVE STATISTICS LEVEL DISTRIBUTION GRAPHS OF NORMED DEFLECTION VALUES in channel A - (defective part) in channel B - (intact part) (values in channel A - values in channel B) X = normed deflection (100*j) Z = value frequency (n) Y = number of days since

18 DATA ANALYSIS / TIME DOMAIN / DESCRIPTIVE STATISTICS number of values (n) Time development of level distribution of normed deflections in channel A with coloured differences (A-B) normed deflection (j) number of days since

19 DATA ANALYSIS/ TIME DOMAIN / DESCRIPTIVE STATISTICS Colouring reflects the number of days since Frequency distribution of deflections in channel B Time development of level distribution of normed deflections in channel A and B with coloured measuring stage Frequency distribution of deflections in channel A

20 DATA ANALYSIS / TIME DOMAIN / DESCRIPTIVE STATISTICS A ~ B in level distribution number of values of deflection in channel B number of values of deflection in channel A

21 DATA ANALYSIS / TIME DOMAIN / DESCRIPTIVE STATISTICS A ~ (A-B) in level distribution number of values (A-B) number of values of deflection in channel A

22 DATA ANALYSIS FREQUENCY DOMAIN FFT of channel A and B normed deflections time section 0,30 FFT(A) FFT(B) 0,25 Amp l.-peak (j) 0,20 0,15 0,10 0,05 0, frequency (Hz)

23 DATA ANALYSIS FREQUENCY DOMAIN Time development of normed deflections FFT in channel A and B Geophone A (defective part) Geophone B (intact part) number of days since number of days since frequency (Hz) frequency (Hz)

24 DATA ANALYSIS Time development of differential FFT amplitudes - FFT of (A - B) isochronal deflections FREQUENCY DOMAIN number of days since frequency (Hz)

25 DATA ANALYSIS Time development of differential FFT amplitudes - FFT of (A - B) isochronal deflections (detail for 5-25 Hz frequency band) FREQUENCY DOMAIN number of days since frequency (Hz)

26 DATA ANALYSIS Time development of FFT amplitude differences {(FFT in channel A) - (FFT in channel B)} FREQUENCY DOMAIN number of days since frequency (Hz)

27 DATA ANALYSIS FREQUENCY DOMAIN normed amplitudes of FFT in channel A (defective part) normed amplitudes of FFT in channel B (intact part) Z = differences of normed amplitudes (A - B)

28 DATA ANALYSIS FREQUENCY DOMAIN normed amplitudes of FFT in channel A (defective part) normed amplitudes of FFT in channel B (intact part) Z = differences of {FFT(A) - FFT(B)}

29 INTEGRAL OF NORMED DEFLECTION TIME SECTION FFT (frequency band 5-25 Hz] 14 I(A) I(B) IFFT(A-B) I(FFTA-FFTB) temperature in tunnel ( C/2) 12 Feb 2007 Mar 2007 Apr 2007 May 2007 Jun 2007 Jul 2007 Aug 2007 Sep 2007 Oct 2007 Nov 2007 Dec 2007 Jan I( FFT) count of days from to

30 8,5 8,0 7,5 7,0 6,5 6,0 INTEGRAL OF NORMED DEFLECTION TIME SECTION FFT (frequency band 5-25 Hz] I(A) I(B) IFFT(A-B) Feb 2007 Mar 2007 Apr 2007 May 2007 Jun 2007 Jul 2007 Aug 2007 Sep 2007 Oct 2007 Nov 2007 Dec 2007 Jan count of days from to I( FFT)

31 b) DYNAMIC RESPONSE OF THE REINFORCED CONCRETE SLAB ON LABORATORY FATIGUE TEST

32 The tested slab in the fatigue test bench.

33 PHASE RELATIONS deflections accelerograms velocity harmonic

34 PHASE RELATIONS - LOADING AREA

35 PHASE RELATIONS - RELAXATION AREA velocity accelerograms deflections harmonic

36 c) MONITORING OF FATIGUE FAILURE TIME-DEVELOPMENT BY MEANS OF EXAMINATION OF ELASTIC WAVES SPREADING PARAMETERS - measuring will start after finishing all intended instalations in the acoustic sampling field.

37 Metro Prague Svatoslav Chamra

38 Measuring standpoints

39 Line A Můstek Staroměstská km 19,435 km 19,480

40 Section fit for instrumentation somewhere between km 19,435 19,480 compressed concrete lining by soviet mechanized tunnelling shield TSCB 3 Prague fault about km 19,450, cca 20 m width tectonic deformation of clay shales zahoranske & bohdalecke & dobrotivske layers boundary line about km 19,463

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42 Geological conditions

43 Various types of cracks

44 October 2007 April 2003

45 April 2003 October 2007

46 Degradation of compressed concrete tunnel lining by aggressive water

47 Thank you for your attention.

48 Nuselský bridge

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50 Facts one of the biggest in the CR built lane road, twin track metro, walkway 485m long, 26,5m wide, 42,5m high pre-stressed reinforced concrete frame on 4 pillars 1997 repair of the steel grid due to fatigue cracks

51 Metro line C 42,5m

52 Proposed instrumentation Tilt plates VW crackmeters Tape extensometer Geophysical methods

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54 Installation in London Underground Peter Bennett Background Spalling in deep tunnel Fresh and historical

55 Damaged area Covers over 130m 54 joints identified Currently monitoring some with VWSG Caused by joint movement Possibly tension cracks on wall? VWSG Monitoring

56 Install 16 tiltmeters B,F,H,M, 1640,1661,1689, crackmeters Joint F-G, 1640,1661,1689,1714 Crack in segment K at relays / environmental monitors L, 1675 and gateway B, 1685 Anemometer and accelerometers Into data logger 24hrs monitoring in each of three locations Proposal

57 Gateway Ethernet gateway in tunnel GPRS connection at top of shaft Remotely powered gateway and repeater hubs