ALBERTA INFRASTRUCTURE AND TRANSPORTATION INSTRUMENTATION - - PDF document

ALBERTA INFRASTRUCTURE AND TRANSPORTATION INSTRUMENTATION MONITORING RESULTS FALL 2006 SECTION C

PEACE REGION (PEACE RIVER I HIGH LEVEL)

SITE PH1 0: HWY 726:02, EUREKA RIVER

1. OBSERVATIONS 1.1 Field Program and Instrumentation Status Three slope inclinometers (SI98-1, 2, and 02-3) and three pneumatic piezometers (PN02-1, 1

a, and 2) were read at the Hwy 726:02 Eureka River site on October 16, 2006 by Mr. Gustavo Padros, M.Sc., and Mr. Kevin Carpenter, of Thurber Engineering Ltd. (Thurber).

T h e Sl's were read using a SINCO Digitilt probe with 2 ft wheelbase and a Digitilt Datamate readout. Inclinometer reading depths were defined as per cable markings with respect to the top of the inclinometer clamps. The pneumatic piezometers were read using a Petur pneumatic piezometer reader supplied by RST Instruments. 2. INTERPRETATION AND RECOMMENDATIONS 2 . 1 General Sl plots with A and B directions are presented in Section D and are summarized

• below. Where movement has .been recorded the resultant plot (X direction, if

applicable) and a rate of movement have also been provided. Pneumatic piezometer results are also provided in Section

D .

2.2 Zones of Movement Zones of new movement were not observed 1n the Sl's since the last set of readings in the Spring of 2006. Zones of old movement are summarized in Table P H 1 0-1 at the end of this report. This table also provides a historical account of the total movement, the dept~

• f

movement, and the maximum rate of movement that has occurred at this site

since the initialization of the slope inclinometers. 2.3 I n t e r p r e t a t i

• n
• f

M

• n

i t

• r

i n g R e s u l t s A n d Recommendations 2.3.1 Interpretation: A very slow creep m

• v

e m e n t (1 mm/yr) was registered at the Sl98-1 location since the last set of readings. However, as mentioned i n a previous report, the bottom of the Sl98-1 is believed to be situated just above or at t h e location of the movement zone, so that it d

• e

s not accurately reflect the rate or the deflection of the slide movement. Slope inclinometer Sl98-2, located upslope of the highway, has registered since the Spring of 2006 an incremental movement of 3.5 mm

• v

e r 0 to 2.7 m depth and recorded a rate of movement of 8.5 mm/yr, which is lower than the trend of movement of previous years. Slope m

• v

e m e n t s were recorded again i n SI02-3, which is located adjacent to the flank of the initial most active slide area. The m

• v

e m e n t rate in SI02-3 over 7.9 to 10.4 m depth has generally remained unchanged, and is currently at 10.5 mm/yr. In the past, the deeper slope inclinometers installed in 2002 indicated that the slide is deep seated. However, the current slide activity could not be accurately monitored as the two deep slope inclinometers (SI02-1 and 2) located in the main zone of movement have sheared off since the Fall 2 3 readings. The piezometric elevation i n pneumatic piezometer PN02-1 h a s increased by 0.6

• m. The water level in pneumatic piezometer PN02-2 has also risen and is now 0.5

m higher than in the Spring of 2006. The piezometric elevation i n PN02

• 1

a decreased 1m. The results are presented i n Table PH10-2. 2.3.2 Recommendations: The area is experiencing continued slide movements, and should be monitored by AIT's personnel and MCI when possible. As the boundaries of the slide extend across the road, any significant slide movement would cause traffic disruption. As noted since our Spring 2004 report, it is r e c

• m

m e n d e d to install additional instruments to replace SI02-1 and SI02-2 and to monitor the slope area between Site #2 and Site #1 where recent movements have been noted. T h e remaining instruments should be read again during the Spring 2 7 program. 3. I N S T R U M E N T A T I O N R E P A I R S All of the current instruments are operational.

Date Monitored: Oct 16, 2006

I N S T R U M E N T D A T E # I N I T I A L I Z E D Sl98-1 08 Mar, 1998 13 Oct, 2000 Sl98-2 set as the initial reading S / 2

• 1

2 4 S e p ,

2 2 S / 2

• 2

2 4 S e p ,

2 2

SI02-3 24 Sep, 2002

TABLE PH1 0-1 Fall 2006- Eureka River (South of Worsley) Slope Inclinometer Instrumentation Reading Summary

T O T A L C U M U L A T I V E INCREMENTAL R E S U L T A N T D A T E MOVEMENT MOVEMENT AT M A X I M U M R A T E CURRENT O F S I N C E N O T E D D E P T H O F MOVEMENT S T A T U S P R E V I O U S P R E V I O U S S I N C E I N I T I A L ( m m / y ) R E A D I N G R E A D I N G R E A D I N G ( m m ) ( m m ) 6.4 mm over 13.1 to 1.1 mm/yr between No discernible 14.3 m depth in 40° Operational May 19, 2006 direction May and Oct, 2005 movement 329.5 mm over 0.0 140.8 mm/yr to 2.7 m depth in 42° between May and Operational May 19, 2006 3.5 direction Sep,2001

N I A N I A

Sf sheared 27

S e p , 2 3

N I A

• ff at 15m

Dummy p r

• b

e got

N I A N I A

s t u c k a t t

• p

27

S e p , 2 3

NIA

• f

S l c a s i n g 14.7 mm over 1.2 to 21.6 mm/yr No discernible 2.4 m depth in 60° between Oct, 2005 direction and May, 2006 movement Operational May 19, 2006 36.7 mm over 7.9 to 14.3 mm/yr 10.4 m depth in 45° between May and 4.3 direction Oct, 2004 C H A N G E IN R A T E R A T E O F O F M O V E M E N T MOVEMENT S I N C E P R E V I O U S ( m m / y ) R E A D I N G ( m m / y ) 1.0 0.3 8.5

• 64.1

N ! A N!A N!A N I A

N/A

• 34.3

10.5 0.9

Date Monitored: Oct 16, 2006

DATE TIP INSTRUMENT# INITIALIZED DEPTH (m) PN02-1 a (27712) N/A 10.0 PN02-1 (2771 0) N/A 19.0 PN02-2 (27711) N/A 14.5

T A B L E P H 1

• 2

F a l l 2006- E u r e k a R i v e r ( S

• u

t h

• f

W

• r

s l e y ) P n e u m a t i c P i e z

• m

e t e r I n s t r u m e n t a t i

• n

R e a d i n g S u m m a r y

MEASURED GROUND CURRENT MAXIMUM PORE PORE ELEV. STATUS PRESSURE (kPa) PRESSURE (m) (kPa) N/A Active 57.0 47

• n

Oct 07, 2004 N/A Active 36.0 36

• n Oct 16, 2006

N/A Active 7.0 6

• n Sep 27, 2003

CURRENT WATER LEVEL BGS (m) 5.2 15.3 13.9

Figure PH 10-1 in Section D provides a sketch of the approximate locations of the monitoring instrumentation for this site NOTES: PN

• pneumatic piezometer;

BGS

• below ground surface

PREVIOUS CHANGE IN WATER WATER LEVEL BGS LEVEL SINCE (m) PREVIOUS READING (m) 4.2

• 1.0

15.9 +0.6 14.4 +0.5

Sl# SJ98-I SI98-2 SI02-3 ALBERTA INFRASTRUCTURJ 0 TRANSPORTATION PEACE REG ION (PEACE :R I HI GH LEVEL) SLOPE INC L I N O M ETER MONITORING F I E L D SUMMARY FALL 2006 Location: PH 10- Eureka River (S. of Worsley) File Number: 15-85-36

P robe: Sinco 28918 and 29524 Cable: 250' and 200' Sinco

Readout: Datamate Extension: NIA Temp: NIA Read by: GP I KJC SLOPE INCLINOMETER (SI) R E A D I N G S G PS Location Date Stickup Depth from top Azimuth of Current Bottom (m)

• f

clamps (ft) A+ Groove Deoth Readings Northing Easting A+ A

• B+

N56° 27.006' W I I 9o 8 . 1 2 ' 1 6

• c

t 0.26 46 to 2 220°

• 9 15

908

• 384

NS6o 26.981'

w

119° 08.054' 1 6

• c

t 0.28 46 to 2 245°

• 274

251 1 7 NS6o 27.040' W I 19" 08.004' 1 6

• c

t 0.14 59 to I 60° 1920

• 1935

295 PNEUMATIC PIEZOMETER READINGS PN# Date Reading I denti tication (osi)l(kPa) Number PN02-1a 1 6

• c

t 10.7 147 27712 PN02-l 1 6

• ct

5.7 136 27710 PN02-2 1 6

• c

t

• 1. 1 I 6

27711 DAlLY INSPECTOR REPORT Remarks B- 383 None

• 29

None 315 None