Downhole Seismic Field Data Report - engage.gov.bc.camotor system. The equipment and procedures...
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Downhole Seismic Field Data Report ConeTec Investigations Ltd. 12140 Vulcan Way Richmond, BC V6V 1J8 - Tel: 604-273-4311 Fax: 604-273-4066 - Toll Free: 800-567-7969 - Email: [email protected] George Massey Tunnel Replacement Project Delta, BC Prepared for: BC Ministry of Transportation and Infrastructure Job No: 14-02003 - February 24 th and March 24 th , 2014 -
Transcript of Downhole Seismic Field Data Report - engage.gov.bc.camotor system. The equipment and procedures...
Downhole Seismic Field Data Report
ConeTec Investigations Ltd.
12140 Vulcan Way Richmond, BC V6V 1J8
- Tel: 604-273-4311 Fax: 604-273-4066
- Toll Free: 800-567-7969
- Email: [email protected]
George Massey Tunnel Replacement Project Delta, BC
Prepared for:
BC Ministry of Transportation and Infrastructure
Job No: 14-02003
- February 24th and March 24th , 2014 -
Downhole Seismic Testing
Downhole seismic testing (DST) was conducted using a system comprising a surface source (a steel I-beamand hammer), a downhole tool equipped with a triaxial geophone package, and a seismograph (Figure 1). In the downhole tool the geophones are mounted on an internal rotating block such that the orientation of the geophones can be maintained within the borehole through the use of a built in fluxgate compass and servo motor system. The equipment and procedures comply with ASTM D 7400 – 08, Standard Test Methods for Downhole Seismic Testing.
The test was performed by lowering the tool to the initial start depth in the cased borehole where it was then coupled to the side of the casing using a motor driven bow spring clamp. Once clamped in place, the twohorizontal geophones were aligned parallel and perpendicular to the shear wave source. Doing so maintains the same orientation of the receivers throughout the test which eliminates any apparent phase changes dueto rotation of the receivers.
To generate a shear wave, a weighted steel beam was struck horizontally a number of times at both ends ofthe beam. Doing this generated a horizontally polarized shear wave (S wave) that traveled from the surfaceto the geophone package. The recorded signal from the horizontally oriented geophone parallel to thesource was used to determine the arrival time of the shear wave. At each depth, the geophone data wasstacked and reviewed on the seismograph computer and after sufficient data was recorded at a single depth the tool was lowered by a set increment to the next depth and the procedure was repeated. The data ispresented as a shear wave velocity profile based on the interval travel times at the test increments. An image of the time domain traces used for the travel time picks is provided for reference.
Figure 1. Downhole Seismic Test.
Downhole Seismic Tests
Appendix DST
Job No: 14-02003
Client: BC Ministry of Transportation and Infrastructure
Project Title: George Massey Tunnel Replacement
Date: February 24th and March 24th, 2014
Sounding ID Location Date Northing (m) Easting (m) Max. Depth (m)
BH13-01 George Massey Tunnel Feb. 24th and March 24th, 2014 5441256 494318 330.0
Coordinates were obtained from the draft Borehole log BH13-01.
Downhole Seismic Summary
Page 1 of 1
Job No: 14-02003
Client: BC Ministry of Transportation and Infrastructure
Project Title: George Massey Tunnel Replacement
Hole: BH13-01
Site: George Massey Tunnel Replacement
Date: February 24th and March 24th, 2014
Receivers: Geostuff BHG-3 - Triaxial 15 Hz geophones
Seismograph: Geometrics Geode
Seismic Source: Beam
Source Offset (m): 1.34
Source Depth (m): 0.00
Geophone Offset (m): 0.00
2.00 2.41
4.00 4.22 1.81 19.90 91 3.00
5.00 5.18 0.96 6.15 156 4.50
6.00 6.15 0.97 6.37 152 5.50
7.00 7.13 0.98 5.77 170 6.50
8.00 8.11 0.98 5.51 179 7.50
9.00 9.10 0.99 5.90 168 8.50
10.00 10.09 0.99 5.52 180 9.50
11.00 11.08 0.99 6.15 161 10.50
13.00 13.07 1.99 11.39 174 12.00
15.00 15.06 1.99 11.59 172 14.00
17.00 17.05 1.99 9.92 201 16.00
18.00 18.05 1.00 5.26 190 17.50
19.00 19.05 1.00 4.34 230 18.50
20.00 20.04 1.00 4.75 210 19.50
21.00 21.04 1.00 4.34 230 20.50
22.00 22.04 1.00 4.35 229 21.50
23.00 23.04 1.00 3.87 258 22.50
26.00 26.03 3.00 12.02 249 24.50
28.00 28.03 2.00 8.30 241 27.00
30.00 30.03 2.00 9.14 219 29.00
32.00 32.03 2.00 10.41 192 31.00
33.00 33.03 1.00 4.95 202 32.50
36.00 36.02 3.00 15.66 191 34.50
37.00 37.02 1.00 4.93 203 36.50
38.00 38.02 1.00 4.67 214 37.50
40.00 40.02 2.00 8.85 226 39.00
41.00 41.02 1.00 4.02 248 40.50
42.00 42.02 1.00 3.81 262 41.50
43.00 43.02 1.00 4.10 244 42.50
44.00 44.02 1.00 4.13 242 43.50
45.00 45.02 1.00 4.00 250 44.50
46.00 46.02 1.00 3.93 254 45.50
47.00 47.02 1.00 4.32 231 46.50
48.00 48.02 1.00 4.23 236 47.50
49.00 49.02 1.00 4.28 234 48.50
50.00 50.02 1.00 4.31 232 49.50
51.00 51.02 1.00 4.29 233 50.50
53.00 53.02 2.00 8.01 250 52.00
55.00 55.02 2.00 7.31 274 54.00
57.00 57.02 2.00 7.18 279 56.00
59.00 59.02 2.00 7.43 269 58.00
61.00 61.01 2.00 7.37 271 60.00
SEISMIC TEST RESULT - Vs
Geophone Depth (m) Ray Path (m) Depth Interval (m) Time Interval (ms) Vs (m/s) Mid Layer (m)
Page 1 of 3
Job No: 14-02003
Client: BC Ministry of Transportation and Infrastructure
Project Title: George Massey Tunnel Replacement
Hole: BH13-01
Site: George Massey Tunnel Replacement
Date: February 24th and March 24th, 2014
Receivers: Geostuff BHG-3 - Triaxial 15 Hz geophones
Seismograph: Geometrics Geode
Seismic Source: Beam
Source Offset (m): 1.34
Source Depth (m): 0.00
Geophone Offset (m): 0.00
SEISMIC TEST RESULT - Vs
Geophone Depth (m) Ray Path (m) Depth Interval (m) Time Interval (ms) Vs (m/s) Mid Layer (m)
63.00 63.01 2.00 7.11 281 62.00
65.00 65.01 2.00 7.53 266 64.00
67.00 67.01 2.00 6.97 287 66.00
69.00 69.01 2.00 6.92 289 68.00
71.00 71.01 2.00 6.78 295 70.00
73.00 73.01 2.00 7.05 284 72.00
75.00 75.01 2.00 6.92 289 74.00
77.00 77.01 2.00 6.93 288 76.00
79.00 79.01 2.00 6.89 290 78.00
81.00 81.01 2.00 6.91 289 80.00
83.00 83.01 2.00 6.92 289 82.00
85.00 85.01 2.00 6.51 307 84.00
87.00 87.01 2.00 6.57 304 86.00
89.00 89.01 2.00 6.22 322 88.00
91.00 91.01 2.00 6.50 307 90.00
93.00 93.01 2.00 6.69 299 92.00
95.00 95.01 2.00 5.98 334 94.00
97.00 97.01 2.00 6.17 324 96.00
99.00 99.01 2.00 6.08 329 98.00
100.00 100.01 1.00 3.18 314 99.50
105.00 105.01 5.00 14.63 342 102.50
110.00 110.01 5.00 14.67 341 107.50
115.00 115.01 5.00 14.75 339 112.50
120.00 120.01 5.00 13.72 364 117.50
125.00 125.01 5.00 13.24 377 122.50
130.00 130.01 5.00 12.61 397 127.50
135.00 135.01 5.00 13.16 380 132.50
140.00 140.01 5.00 13.04 384 137.50
145.00 145.01 5.00 12.87 389 142.50
150.00 150.01 5.00 12.68 394 147.50
155.00 155.01 5.00 12.57 398 152.50
160.00 160.01 5.00 11.95 418 157.50
165.00 165.01 5.00 11.56 433 162.50
170.00 170.00 5.00 11.51 434 167.50
175.00 175.00 5.00 11.82 423 172.50
180.00 180.00 5.00 11.49 435 177.50
185.00 185.00 5.00 11.96 418 182.50
190.00 190.00 5.00 11.47 436 187.50
195.00 195.00 5.00 10.87 460 192.50
200.00 200.00 5.00 11.11 450 197.50
205.00 205.00 5.00 10.35 483 202.50
210.00 210.00 5.00 10.20 490 207.50
220.00 220.00 10.00 21.50 465 215.00
Page 2 of 3
Job No: 14-02003
Client: BC Ministry of Transportation and Infrastructure
Project Title: George Massey Tunnel Replacement
Hole: BH13-01
Site: George Massey Tunnel Replacement
Date: February 24th and March 24th, 2014
Receivers: Geostuff BHG-3 - Triaxial 15 Hz geophones
Seismograph: Geometrics Geode
Seismic Source: Beam
Source Offset (m): 1.34
Source Depth (m): 0.00
Geophone Offset (m): 0.00
SEISMIC TEST RESULT - Vs
Geophone Depth (m) Ray Path (m) Depth Interval (m) Time Interval (ms) Vs (m/s) Mid Layer (m)
225.00 225.00 5.00 10.92 458 222.50
230.00 230.00 5.00 11.29 443 227.50
235.00 235.00 5.00 10.82 462 232.50
240.00 240.00 5.00 10.49 477 237.50
245.00 245.00 5.00 10.30 485 242.50
250.00 250.00 5.00 10.68 468 247.50
255.00 255.00 5.00 10.43 479 252.50
260.00 260.00 5.00 10.35 483 257.50
265.00 265.00 5.00 10.45 478 262.50
270.00 270.00 5.00 10.43 479 267.50
275.00 275.00 5.00 10.38 482 272.50
280.00 280.00 5.00 10.16 492 277.50
285.00 285.00 5.00 10.21 490 282.50
290.00 290.00 5.00 10.02 499 287.50
295.00 295.00 5.00 10.63 470 292.50
300.00 300.00 5.00 10.73 466 297.50
305.00 305.00 5.00 10.63 470 302.50
310.00 310.00 5.00 10.44 479 307.50
315.00 315.00 5.00 10.46 478 312.50
320.00 320.00 5.00 10.02 499 317.50330.00 330.00 10.00 18.84 531 325.00
Page 3 of 3
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Job No: 14-02003 Client: MOTI Location: George Massey Tunnel Replacement Sounding: BH13-01 Date: February 24 and March 24, 2014
14-02003_BH13-01 Time Domain Traces – Part 1 (Feb. 24, 2014)
14-02003_BH13-01 Time Domain Traces – Part 2 (March 24, 2014)
