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Home My WebLink AboutReview of Micropile Foundation Load Testing 05.01.2020May 1, 2020 Mr. Shaun Brainard B&Y Drilling, Inc. P.O. Box 1878 Rifle, Colorado 81650 Project No. 14 -008G -D3 Subject: Review of Micropile Foundation Load Testing, Schlegel Residence, 1675 County Road 109 in Garfield County, Colorado Dear Mr. Brainard, RJ Engineering conducted micropile Toad testing for the Schlegel Residence at 1675 County Road 109 in Garfield County, Colorado on May 1, 2020. We conducted two proof tests on production piles to verify assumed soil strength parameters. The tests were performed in tension, which we believe is more conservative than a compression test. Therefore, the measured deflections would typically be more than if the micropile were tested in compression. The proof tests were loaded to 1.6 times design load. The total measured deflections were 0.33 and 0.35 inches at the design load. The tests were conducted in general conformance with FHWA guidelines and the test results are attached. The micropile movements appeared higher than typically measured. We believe this is due to the unbonded length that was required by the geotechnical engineer. We believe test results indicated movements were within acceptable design limits (see attached). Based on our test data, it appears the micropiles installed by B&Y Drilling, Inc. were in general conformance with plans provided by RJ Engineering & Consulting, Inc., dated April 20, 2020. RJ Engineering did not verify micropile locations. Survey and micropile layout was assumed to be the responsibility of others. If you have questions or need additional information, please call us at 970-230-9208. Sincerely, RJ Engineering & Consulting, Inc. Richard D. Johnson, P.E. Project Manager 266 Red Cliff Circle, Glenwood Springs, CO 81601, (970) 230-9208 Micropile Proof Test Schlegel Residence, 1675 County Road 109 Micropile Designation: #11 Job Number: 14 -008G -D3 Testers: RJ Date: May 1, 2020 Design Load: Bond Length: Stress Length Bar Size: 30,000 lbs 78 feet 3.5 feet No. 8 Load Hold Time Load (lbs) Pressure (psi) Total Movement (inches) Residual Movement (inches) Elastic Movement (inches) Load/Movement* (in/kip) AL(.05 DL) 2.5 min 3825 400 0.000 0.004 0.013 0.012 0.014 0.014 0.014 0.016 0.017 0.016 0.016 0.019 0.15DL 2.5 min 4500 454 0.003 0.30DL 2.5 min 9000 798 0.063 0.45DL 2.5 min 13500 1143 0.116 0.60DL 2.5 min 18000 1488 0.180 0.75DL 2.5 min 22500 1833 0.241 0.90DL 2.5 min 27000 2177 0.306 1.00DL 2.5 min 30000 2407 0.353 1.15DL 2.5 min 34500 2752 0.431 1.30DL 1min 39000 3096 0.502 2min 0.502 3min 0.503 4min 0.503 5m in 0.504 6min 0.504 10min 0.506 20min 30min 40min 50min 60min 1.45DL 2.5 min 43500 3441 0.573 1.60DL 2.5 min 48000 3786 0.657 0.592 1.30DL 4 min 39000 3096 0.604 1.00DL 4 min 30000 2407 0.511 0.75DL 4 min 22500 1833 0.431 0.50DL 4 min 15000 1258 0.333 0.25DL 4 min 7500 684 0.150 AL(.o5 DL) 4 min 3825 400 COMMENTS: * Must be Tess than 0.025 in/kip. 0.065 0.006 0.010 0.011 0.013 0.024 0.023 Micropile Proof Test Schlegel Residence, 1675 County Road 109 Project No.: 14 -008G -D3 Date: 05/01/20 Micropile Location: #11 Test Type: Tension Design Load = Bond Length = Stress Length = Bar Size = 30,000 lbs 78 feet 3.5 feet No. 8 Load (lbs) Total Movement (in) 3825 0.000 4500 0.003 9000 0.063 13500 0.116 18000 0.180 22500 0.241 27000 0.306 30000 0.353 34500 0.431 39000 0.502 39000 0.506 43500 0.573 48000 0.657 39000 0.604 30000 0.511 22500 0.431 15000 0.333 7500 0.150 3825 0.065 Total Movement (inches) 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0 10000 20000 Load (lbs) 30000 40000 50000 60000 Micropile Proof Test Schlegel Residence, 1675 County Road 109 Micropile Designation: #8 Design Load: Job Number: 14-O08G-D3 Testers: RJ Date: May 1, 2020 Bond Length: Stress Length Bar Size: 45.000 lbs 78 feet 3.5 feet No. 10 Load Hold Time Load (lbs) Pressure (psi) Total Movement (inches) Residual Movement (inches) Elastic Movement (inches) Load/Movement* (in/kip) AL(.o5 DL) 2.5 min 3825 400 0.000 0.007 0.007 0.006 0.005 0.008 0.009 0.014 0.011 0.014 0.013 0.013 0.15DL 2.5 min 6750 626 0.020 0.30DL 2.5 min 13500 1143 0.066 0.45DL 2.5 min 20250 1660 0.109 0.60DL 2.5 min 27000 2177 0.145 0.75DL 2.5 min 33750 2694 0.201 0.90DL 2.5 min 40500 3211 0.265 1.00DL 2.5 min 45000 3556 0.326 1.15DL 2.5 min 51750 4073 0.401 1.30DL 1min 58500 4590 0.494 2min 0.496 3m in 0.497 4min ;- 0.498 5min 0.500 6m in 0.502 10min 0.505 20min 30min 40min 50min 60min 1.45DL 2.5 min 65250 5107 0.580 1.60DL 2.5 min 72000 5624 0.665 0.513 1.30DL 4 min 58500 4590 0.617 1.00DL 4 min 45000 3556 0.534 0.75DL 4 min 33750 2694 0.438 0.50DL 4 min 22500 1833 0.340 0.25DL 4 min 11250 971 0.236 AL(.05 DL) 4 min 3825 COMMENTS: * Must be less than 0.025 in/kip. 400 0.152 0.004 0.006 0.009 0.009 0.009 0.011 Micropile Proof Test Schlegel Residence, 1675 County Road 109 Project No.: 14 -008G -D3 Date: 05/01/20 Micropile Location: #8 Test Type: Tension Design Load = Bond Length = Stress Length = Bar Size = 45,000 lbs 78 feet 3.5 feet No. 10 Load (lbs) Total Movement (in) 3825 0.000 6750 0.020 13500 0.066 20250 0.109 27000 0.145 33750 0.201 40500 0.265 45000 0.326 51750 0.401 58500 0.494 58500 0.505 65250 0.580 72000 0.665 58500 0.617 45000 0.534 33750 0.438 22500 0.340 11250 0.236 3825 0.152 Total Movement (inches) 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0 10000 20000 30000 Load (lbs) 40000 50000 60000 70000 80000