ALBERTA INFRASTRUCTURE AND TRANSPORTATION INSTRUMENTATION MONITORING RESULTS FALL 2007

Transcription

1 ALBERTA INFRASTRUCTURE AND TRANSPORTATION INSTRUMENTATION MONITORING RESULTS FALL 2007 SECTION C NORTH CENTRAL REGION SITE NC 19 : HWY 39 :06 - BUCK LAKE CREEK 1. OBSERVATIONS 1.1 Field Program and Instrumentation Status Seven slope inclinometers (SI1, 2, 5, 01-2A, 01-3A, 02-1,and 02-2), two standpipe piezometers (SP 01-2A and 01-3A) and three pneumatic piezometers (PN 1, 2, and 01-2A) were read at the Buck Lake Creek site on October 1, 2007, by Mr. Tarek Abdelaziz, of Thurber Engineering Ltd. (Thurber). The SI's were read using a SINCO Digitilt probe with 2 ft wheelbase and SINCO Digitilt Datamate readout. Inclinometer reading depths were defined as per cable markings with respect to the top of the inclinometer casing. The pneumatic piezometers were read using a Petur pneumatic piezometer reader supplied by RST Instruments. The standpipe piezometers were read using a SINCO dipmeter. 2. INTERPRETATION 2.1 General SI plots for A and B directions are presented in Section D and are summarized below. Where has been recorded the resultant plot (X direction) and rate of have also been provided. Pneumatic and standpipe piezometer results are also provided in Section D.

2 Alberta Infrastructure and Transportation October, Zones of Movement Zones of new were not observed in the Sis since the last set of readings in the Spring of Zones of old are summarized in Table NC1 9-1 at the end of this report. Table NC19-1 also provides a historical account of the total, the depth of, and the maximum rate of that has occurred at this site since the initialization of the slope inclinometers. 2.3 Interpretation of Monitoring Results No discernable has occurred in S12, S15, and S The rate of has increased by 1.35 mm/yr, 10.6 mm/yr, 7.3 mm/yr in S11, S101-2A, and S102-2, respectively. S101-3A showed a reduction in the rate of by 33.2 mm/yr. The maximum rate of of 11.8 mm/yr was noted in S101-2A and S101-3A. The water level reading has increased in standpipe piezometer SP01-2A by 0.2m and has decreased by 0.3m in SP01-3A, when compared to the readings of the Spring of The water pressure head in pneumatic piezometers PN1 and PN01-2A has increased by 0.3m and 0.02m, respectively. There was no change in the PN2 water level. 3. RECOMMENDATIONS 3.1 Future Work The instruments should be read again in the Spring of Instrumentation Repairs No instrument repairs are required.

3 Date Monitored : October 1, 2007 TABLE NC19-1 Slope Inclinometers TOTAL CUMULATIVE RESULTANT MAXIMUM INCREMENTAL INSTRUMENT AND OF STATUS SINCE # INITIALIZED DEPTH OF OF SI (mm) TO (mm) S11 27 Aug., over 5 to 6.9m depth in 140 direction SINCE (mmlyr) 3.4 between Spring and Operational Fall 2005 May 17, S12 27 Aug., 1991 No discernible N/A Operational May 17, 2007 N/A N/A N/A S15 21 Jun., 1996 No discernible N/A Operational May 17, 2007 N/A N/A N/A S101-1A 23 May, 2001 No discernible N/A Damaged May 24, 2006 N/A N/A N/A A 23 Ma 2001 y' 63.8 over 2. to 4.1m depth in 312 direction in Fall 2001 Operational May 17, S101-3A 23 May, over 1.7 to 4.1 m depth in 4 direction in August 2001 Operational May 17,

4 Date Monitored : October 1, 2007 TABLE NC19-1 (Continued) Slope Inclinometers INSTRUMENT # INITIALIZED TOTAL CUMULATIVE RESULTANT AND DEPTH OF TO (mm) MAXIMUM STATUS OF SI OF INCREMENTAL SINCE (mm) SINCE S July 2002 No discernable N/A Operational May 17, 2007 No discernable N/A N/A 12.1 over 1.2 to 3.1 m depth in 348 direction 6.3 between Sept., and Oct., SI July Operational May 17, between Spring, and Fall, SI - Slope Inclinometer

5 TABLE NC19-2 Pneumatic and Standpipe Piezometer Date Monitored : October INSTRUMENT TIP ELEV. # INITIALIZED (m) PN 1 N/A Active PN2 N/A Active PN 01-1A 23 May, Inactive GROUND * MAXIMUM. PORE MEASURED PORE ELEV. STATUS PRESSURE ( kpa) PRESSURE (kpa) (m) (FAIT 2007 ) (kpa) (Spring 2007) 73.0 on Oct. 6, (23.0 m BGS) (22.8 m BGS) (23.1 m BGS) 2.0 on May 24, (30.3 m BGS) (30.5 m BGS) (30.5 m BGS) on Sept. 7, 2001 (6.3 m BGS) WATER LEVEL SINCE (m) 0. 3 N/A N/A N/A N/A PN 01-2A 23 May, Active on May 24, (4.4 m BGS) (4.43 m BGS) (4.45 m BGS) MAXIMUM WATER LEVEL ELEVATION (m) MEASURED WATER MEASURED LEVEL ELEVATION WATER LEVEL WATER ELEVATION (m) LEVEL SINCE (m) (Fall 2007) (Spring 2007 ) (m) SP 01-2A 23 May, Active on Sep 29, (7.46 m BGS) (9.6 m BGS) (9.8 m BGS) 0. 2 SP 01-3A 23 May, Active on Oct.6, (0.06 m AGS) (0.04 m BGS) (0.26 m AGS) Figure NC1 9-1 in Section D provides a sketch of the approximate locations of the monitoring instrumentation for this site NOTES: SP - standpipe (for water level monitoring, 1" PVC ); PN - pneumatic piezometer; SI- slope inclinometer; BGS - below ground surface; AGS - above ground surface )* Elevation relative to site datum ( not geodetic) -0. 3