lap report (GEOTECHNICAl)

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0a_Triaxialdata_2018_1811.xlsx
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Intro

σ3 25kPa

Time Displacement (mm) Load (N)
0:00:00 1.02 58 <---------- You will need to zero both the displacement and load values at time = 0
0:00:10 1.17 64 The values that follow should then be altered relative to the initial 0 value
0:00:20 1.31 99
0:00:30 1.44 126
0:00:40 1.58 148
0:00:50 1.73 165
0:01:00 1.9 180
0:01:10 2.06 188
0:01:20 2.23 200
0:01:30 2.4 206
0:01:40 2.57 211
0:01:50 2.75 217
0:02:00 2.91 224
0:02:10 3.08 228
0:02:20 3.24 230
0:02:30 3.4 235
0:02:40 3.57 240
0:02:50 3.73 240
0:03:00 3.88 243
0:03:10 4.06 247
0:03:20 4.22 252
0:03:30 4.4 254
0:03:40 4.56 256
0:03:50 4.74 259
0:04:00 4.91 259
0:04:10 5.1 262
0:04:20 5.24 265
0:04:30 5.41 267
0:04:40 5.56 269
0:04:50 5.73 270
0:05:00 5.9 273
0:05:10 6.07 273
0:05:20 6.23 276
0:05:30 6.41 279
0:05:40 6.57 280
0:05:50 6.75 282
0:06:00 6.92 284
0:06:10 7.08 285
0:06:20 7.24 286
0:06:30 7.41 286
0:06:40 7.57 287
0:06:50 7.72 291
0:07:00 7.91 288
0:07:10 8.07 291
0:07:20 8.24 291
0:07:30 8.4 294
0:07:40 8.57 295
0:07:50 8.74 296
0:08:00 8.91 296
0:08:10 9.08 297
0:08:20 9.23 297
0:08:30 9.41 299
0:08:40 9.57 299
0:08:50 9.72 301
0:09:00 9.89 302
0:09:10 10.08 303
0:09:20 10.24 303
0:09:30 10.4 303
0:09:40 10.57 301
0:09:50 10.74 302
0:10:00 10.91 303
0:10:10 11.08 305
0:10:20 11.24 303
0:10:30 11.41 305
0:10:40 11.57 305
0:10:50 11.73 305
0:11:00 11.91 304
0:11:10 12.07 303
0:11:20 12.24 305
0:11:30 12.4 308
0:11:40 12.57 305
0:11:50 12.73 304
0:12:00 12.9 305
0:12:10 13.07 304
0:12:20 13.25 307
0:12:30 13.4 305
0:12:40 13.56 305
0:12:50 13.73 306
0:13:00 13.9 307
0:13:10 14.06 309
0:13:20 14.23 306
0:13:30 14.4 304
0:13:40 14.58 304
0:13:50 14.73 305
0:14:00 14.9 304
0:14:10 15.07 305
0:14:20 15.22 306
0:14:30 15.39 304
0:14:40 15.56 304
0:14:50 15.73 305
0:14:54 15.8 302

σ3 50kPa

Time Displacement (mm) Load (N)
0:00:00 2.75 22 <---------- You will need to zero both the displacement and load values at time = 0
0:00:10 2.77 41 The values that follow should then be altered relative to the initial 0 value
0:00:20 2.85 52
0:00:30 2.97 59
0:00:40 3.14 73
0:00:50 3.31 74
0:01:00 3.45 81
0:01:10 3.62 80
0:01:20 3.79 85
0:01:30 3.95 91
0:01:40 4.1 94
0:01:50 4.23 93
0:02:00 4.36 103
0:02:10 4.53 103
0:02:20 4.69 107
0:02:30 4.85 110
0:02:40 5.01 115
0:02:50 5.17 118
0:03:00 5.35 123
0:03:10 5.51 127
0:03:20 5.68 131
0:03:30 5.85 135
0:03:40 6.01 138
0:03:50 6.16 142
0:04:00 6.33 145
0:04:10 6.49 148
0:04:20 6.65 152
0:04:30 6.83 158
0:04:40 6.99 159
0:04:50 7.15 163
0:05:00 7.32 167
0:05:10 7.49 171
0:05:20 7.66 175
0:05:30 7.83 176
0:05:40 7.99 179
0:05:50 8.15 183
0:06:00 8.32 184
0:06:10 8.48 188
0:06:20 8.65 190
0:06:30 8.81 194
0:06:40 8.99 198
0:06:50 9.16 202
0:07:00 9.31 202
0:07:10 9.47 204
0:07:20 9.66 207
0:07:30 9.82 211
0:07:40 9.98 215
0:07:50 10.15 217
0:08:00 10.31 218
0:08:10 10.46 220
0:08:20 10.64 224
0:08:30 10.83 228
0:08:40 10.99 230
0:08:50 11.16 234
0:09:00 11.32 234
0:09:10 11.48 236
0:09:20 11.65 239
0:09:30 11.82 241
0:09:40 11.98 241
0:09:50 12.14 246
0:10:00 12.3 248
0:10:10 12.48 252
0:10:20 12.64 256
0:10:30 12.81 255
0:10:40 12.97 257
0:10:50 13.14 257
0:11:00 13.31 262
0:11:10 13.48 262
0:11:20 13.64 263
0:11:30 13.81 269
0:11:40 13.98 270
0:11:50 14.14 272
0:12:00 14.31 274
0:12:10 14.47 275
0:12:20 14.64 277
0:12:30 14.82 277
0:12:40 14.98 281
0:12:50 15.15 281
0:13:00 15.3 282
0:13:10 15.48 284
0:13:20 15.64 286
0:13:30 15.81 288
0:13:40 15.98 290
0:13:50 16.15 288
0:14:00 16.31 293
0:14:10 16.47 292
0:14:20 16.64 295
0:14:30 16.8 296
0:14:40 16.98 297
0:14:50 17.14 299
0:15:00 17.31 301
0:15:10 17.47 302
0:15:20 17.63 302
0:15:30 17.8 304
0:15:38 17.95 307

σ3 100kPa

Time Displacement (mm) Load (N)
0:00:00 1.03 15 <---------- You will need to zero both the displacement and load values at time = 0
0:00:10 1.11 58 The values that follow should then be altered relative to the initial 0 value
0:00:20 1.23 92
0:00:30 1.4 116
0:00:40 1.57 128
0:00:50 1.74 140
0:01:00 1.91 151
0:01:10 2.08 157
0:01:20 2.24 166
0:01:30 2.41 172
0:01:40 2.56 180
0:01:50 2.72 187
0:02:00 2.89 195
0:02:10 3.04 200
0:02:20 3.21 207
0:02:30 3.38 212
0:02:40 3.56 218
0:02:50 3.72 225
0:03:00 3.9 230
0:03:10 4.07 233
0:03:20 4.23 241
0:03:30 4.4 245
0:03:40 4.56 251
0:03:50 4.7 254
0:04:00 4.87 260
0:04:10 5.04 265
0:04:20 5.2 267
0:04:30 5.37 273
0:04:40 5.54 277
0:04:50 5.71 281
0:05:00 5.88 286
0:05:10 6.04 290
0:05:20 6.21 294
0:05:30 6.38 297
0:05:40 6.54 299
0:05:50 6.7 305
0:06:00 6.86 307
0:06:10 7.03 312
0:06:20 7.21 316
0:06:30 7.37 320
0:06:40 7.54 322
0:06:50 7.7 326
0:07:00 7.87 329
0:07:10 8.05 331
0:07:20 8.21 334
0:07:30 8.38 338
0:07:40 8.54 343
0:07:50 8.7 344
0:08:00 8.87 348
0:08:10 9.03 352
0:08:20 9.2 355
0:08:30 9.37 359
0:08:40 9.54 360
0:08:50 9.71 365
0:09:00 9.87 367
0:09:10 10.04 369
0:09:20 10.21 371
0:09:30 10.38 374
0:09:40 10.54 378
0:09:50 10.69 381
0:10:00 10.87 384
0:10:10 11.04 386
0:10:20 11.21 388
0:10:30 11.37 390
0:10:40 11.54 393
0:10:50 11.71 396
0:11:00 11.87 398
0:11:10 12.05 401
0:11:20 12.21 402
0:11:30 12.38 406
0:11:40 12.54 409
0:11:50 12.71 410
0:12:00 12.86 413
0:12:10 13.04 417
0:12:20 13.21 420
0:12:30 13.37 420
0:12:40 13.54 424
0:12:50 13.7 425
0:13:00 13.86 427
0:13:10 14.03 429
0:13:20 14.19 432
0:13:30 14.37 434
0:13:40 14.52 436
0:13:50 14.69 437
0:14:00 14.86 438
0:14:10 15.03 442
0:14:20 15.2 443
0:14:30 15.36 444
0:14:40 15.53 447
0:14:50 15.7 450
0:15:00 15.86 451
0:15:10 16.02 452
0:15:20 16.2 454
0:15:21 16.23 453

σ3 200kPa

Time Displacement (mm) Load (N)
0:00:00 1.63 170 <---------- You will need to zero both the displacement and load values at time = 0
0:00:10 1.76 196 The values that follow should then be altered relative to the initial 0 value
0:00:20 1.83 215
0:00:30 1.99 229
0:00:40 2.15 238
0:00:50 2.31 245
0:01:00 2.47 253
0:01:10 2.64 259
0:01:20 2.81 267
0:01:30 2.98 273
0:01:40 3.16 279
0:01:50 3.33 286
0:02:00 3.5 291
0:02:10 3.66 296
0:02:20 3.83 301
0:02:30 4 307
0:02:40 4.16 311
0:02:50 4.31 317
0:03:00 4.48 322
0:03:10 4.64 326
0:03:20 4.81 331
0:03:30 4.98 336
0:03:40 5.16 341
0:03:50 5.33 345
0:04:00 5.5 349
0:04:10 5.67 354
0:04:20 5.83 358
0:04:30 6 362
0:04:40 6.16 366
0:04:50 6.32 371
0:05:00 6.48 374
0:05:10 6.64 379
0:05:20 6.81 382
0:05:30 6.98 386
0:05:40 7.16 390
0:05:50 7.33 394
0:06:00 7.5 397
0:06:10 7.67 401
0:06:20 7.84 404
0:06:30 8 408
0:06:40 8.17 410
0:06:50 8.33 414
0:07:00 8.49 417
0:07:10 8.65 421
0:07:20 8.82 424
0:07:30 9 428
0:07:40 9.17 431
0:07:50 9.34 434
0:08:00 9.51 437
0:08:10 9.68 440
0:08:20 9.85 442
0:08:30 10.01 445
0:08:40 10.17 448
0:08:50 10.33 451
0:09:00 10.49 454
0:09:10 10.65 457
0:09:20 10.82 459
0:09:30 10.99 463
0:09:40 11.16 465
0:09:50 11.34 468
0:10:00 11.51 469
0:10:10 11.68 474
0:10:20 11.85 476
0:10:30 12.01 478
0:10:40 12.17 481
0:10:50 12.33 484
0:11:00 12.49 486
0:11:10 12.65 489
0:11:20 12.82 491
0:11:30 12.99 493
0:11:40 13.16 497
0:11:50 13.34 498
0:12:00 13.51 502
0:12:10 13.68 503
0:12:20 13.85 505
0:12:30 14.01 507
0:12:40 14.17 509
0:12:50 14.33 513
0:13:00 14.49 514
0:13:10 14.65 516
0:13:20 14.82 519
0:13:30 14.99 520
0:13:40 15.16 523
0:13:50 15.33 525
0:14:00 15.51 527
0:14:10 15.68 528
0:14:20 15.84 531
0:14:30 16.01 533
0:14:40 16.17 534
0:14:50 16.34 536
0:15:00 16.5 539
0:15:10 16.66 541
0:15:20 16.82 542
0:15:21 16.83 543

σ3 400kPa

Time Displacement (mm) Load (N)
0:00:00 5.36 38 <---------- You will need to zero both the displacement and load values at time = 0
0:00:10 5.35 46 The values that follow should then be altered relative to the initial 0 value
0:00:20 5.5 61
0:00:30 5.64 139
0:00:40 5.81 166
0:00:50 5.98 181
0:01:00 6.15 196
0:01:10 6.31 206
0:01:20 6.48 218
0:01:30 6.64 228
0:01:40 6.81 240
0:01:50 6.97 248
0:02:00 7.13 259
0:02:10 7.29 267
0:02:20 7.46 277
0:02:30 7.63 286
0:02:40 7.8 295
0:02:50 7.97 304
0:03:00 8.14 311
0:03:10 8.31 320
0:03:20 8.48 325
0:03:30 8.64 334
0:03:40 8.8 339
0:03:50 8.96 347
0:04:00 9.13 353
0:04:10 9.29 361
0:04:20 9.46 366
0:04:30 9.63 372
0:04:40 9.8 379
0:04:50 9.97 384
0:05:00 10.14 390
0:05:10 10.3 396
0:05:20 10.47 402
0:05:30 10.63 408
0:05:40 10.79 413
0:05:50 10.96 419
0:06:00 11.12 424
0:06:10 11.28 430
0:06:20 11.45 436
0:06:30 11.62 441
0:06:40 11.79 446
0:06:50 11.96 451
0:07:00 12.13 457
0:07:10 12.3 462
0:07:20 12.47 467
0:07:30 12.63 471
0:07:40 12.79 477
0:07:50 12.95 481
0:08:00 13.11 487
0:08:10 13.27 490
0:08:20 13.44 496
0:08:30 13.61 501
0:08:40 13.78 506
0:08:50 13.95 511
0:09:00 14.12 516
0:09:10 14.29 520
0:09:20 14.45 526
0:09:30 14.62 530
0:09:40 14.78 532
0:09:50 14.94 537
0:10:00 15.1 542
0:10:10 15.26 546
0:10:20 15.43 551
0:10:30 15.6 555
0:10:40 15.77 560
0:10:50 15.94 563
0:11:00 16.11 569
0:11:10 16.28 572
0:11:20 16.45 576
0:11:30 16.61 580
0:11:40 16.77 584
0:11:50 16.94 588
0:12:00 17.1 591
0:12:10 17.26 596
0:12:20 17.42 600
0:12:30 17.59 603
0:12:40 17.76 607
0:12:50 17.94 611
0:13:00 18.1 612
0:13:10 18.27 618
0:13:20 18.44 620
0:13:30 18.6 627
0:13:40 18.76 628
0:13:50 18.92 633
0:14:00 19.08 635
0:14:10 19.24 640
0:14:20 19.41 643
0:14:30 19.57 648
0:14:40 19.74 652
0:14:50 19.91 654
0:15:00 20.08 659
0:15:10 20.25 661
0:15:20 20.41 666
0:15:29 20.57 667

σ3 800kPa

Time Displacement (mm) Load (N)
0:00:00 -0.52 36 <---------- You will need to zero both the displacement and load values at time = 0
0:00:10 -0.53 44 The values that follow should then be altered relative to the initial 0 value
0:00:20 -0.53 57
0:00:30 -0.53 106
0:00:40 -0.52 161
0:00:50 -0.52 203
0:01:00 -0.52 233
0:01:10 -0.52 263
0:01:20 -0.51 290
0:01:30 -0.36 311
0:01:40 -0.2 333
0:01:50 -0.03 353
0:02:00 0.13 371
0:02:10 0.3 391
0:02:20 0.46 410
0:02:30 0.64 427
0:02:40 0.8 441
0:02:50 0.97 460
0:03:00 1.14 474
0:03:10 1.28 491
0:03:20 1.45 505
0:03:30 1.62 518
0:03:40 1.77 534
0:03:50 1.93 547
0:04:00 2.1 561
0:04:10 2.28 573
0:04:20 2.44 585
0:04:30 2.63 597
0:04:40 2.78 608
0:04:50 2.96 620
0:05:00 3.13 632
0:05:10 3.29 646
0:05:20 3.45 656
0:05:30 3.64 666
0:05:40 3.75 681
0:05:50 3.95 690
0:06:00 4.11 695
0:06:10 4.28 705
0:06:20 4.45 717
0:06:30 4.61 726
0:06:40 4.79 735
0:06:50 4.95 745
0:07:00 5.12 753
0:07:10 5.28 763
0:07:20 5.44 772
0:07:30 5.61 780
0:07:40 5.77 789
0:07:50 5.95 797
0:08:00 6.11 804
0:08:10 6.27 813
0:08:20 6.44 818
0:08:30 6.61 825
0:08:40 6.78 833
0:08:50 6.94 841
0:09:00 7.11 845
0:09:10 7.27 856
0:09:20 7.45 862
0:09:30 7.61 868
0:09:40 7.78 874
0:09:50 7.94 881
0:10:00 8.11 888
0:10:10 8.27 893
0:10:20 8.44 898
0:10:30 8.62 904
0:10:40 8.77 910
0:10:50 8.95 914
0:11:00 9.11 921
0:11:10 9.28 929
0:11:20 9.44 935
0:11:30 9.61 939
0:11:40 9.77 944
0:11:50 9.94 949
0:12:00 10.11 953
0:12:10 10.27 957
0:12:20 10.44 963
0:12:30 10.59 968
0:12:40 10.77 972
0:12:50 10.93 976
0:13:00 11.11 981
0:13:10 11.28 986
0:13:20 11.43 993
0:13:30 11.6 995
0:13:40 11.78 1000
0:13:50 11.94 1004
0:14:00 12.11 1009
0:14:10 12.27 1011
0:14:20 12.44 1014
0:14:30 12.6 1017
0:14:40 12.77 1022
0:14:50 12.94 1024
0:15:00 13.09 1028
0:15:10 13.27 1034
0:15:20 13.43 1040
0:15:30 13.6 1041
0:15:40 13.76 1045
0:15:50 13.92 1047
0:16:00 14.09 1048
0:16:10 14.28 1054
0:16:20 14.43 1057
0:16:30 14.59 1057
0:16:34 14.68 1059

Geotechnics – Triaxial test lab

Using the tabs below, you can now explore the Triaxial telemetry for all of the Triaxial tests so far carried out by the various groups. They are arranged in ascending cell pressures (σ3). From these tabs you are expected to choose a minimum of four cell pressure data sets that you feel will best enable you to:

· Plot at least four deviator stress v axial strain curves in a single graph. This will require you to be able to calculate the changing cross-sectional area of the sample throughout the test procedure.

· Identify the failure values of deviator stress and strain on each line graph, and then correct the deviator stress at the failure value in accordance with 9.5.6 of BS1377-7:1990 (membrane thickness is 0.2 mm).

· Plot the most favourable Mohr Circles as instructed in the lab session based on all of the σ3 and σ1 (σ3 + P/A) values.

· Plot the resultant tangent line that will give you both the angle of shearing resistance (ΦU) and the apparent cohesion (cu).

The data sets will only contain the displacement and load telemetry logged during the test. All of the other data can be calculated from these two variables, and the knowledge that the sample began the test with a length of 76mm and a diameter of 38mm. If you are unsure of anything described here or during the lab session, please contact:

Anthony Smith

[email protected]

Geotechnics – Triaxial test lab

Using the tabs below, you can now explore the Triaxial telemetry for

all of the Triaxial tests so far carried out by the various groups. They

are arranged in ascending cell pressures ( σ

3

). From these tabs you

are expected to choose a minimum of four cell pressure data sets

that you feel will best enable you to:

 Plot at least four deviator stress v axial strain curves in a

single graph. This will require you to be able to calculate the

changing cross-sectional area of the sample throughout the

test procedure.

 Identify the failure values of deviator stress and strain on each

line graph, and then correct the deviator stress at the failure

value in accordance with 9.5.6 of BS1377 -7:1990 (membrane

thickness is 0.2 mm).

 Plot the most favourable Mohr Circles as instructed in the lab

session based on all of the σ

3

and σ

1

(σ

3

+ P/A)

values.

 Plot the resultant tangent line that will give you both the angle

of shearing resistance ( Φ

U

) and the apparent cohesion (c

u

).

The data sets will only contain the displacement and load telemetry

logged during the test. All of the other data can be calculated from

these two variables, and the knowledge that the sample began the

test with a length of 76mm an d a diameter of 38mm. If you are

unsure of anything described here or during the lab session, please

contact:

Anthony Smith

a.o.smith@leedsbeckett .ac.uk