THE Conference 2018 Champaign, Illinois February 28, 2018
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1 Drilled Shaft Design in Weak Illinois Rocks Timothy D. Stark, James H. Long, & Ahmed Baghdady University of Illinois at Urbana-Champaign & Abdolreza Osouli Southern Illinois at Edwardsville THE Conference 2018 Champaign, Illinois February 28, 2018
2 IL 89 Bridge Spring Valley, IL 2/28 89
3 Illinois Shales 3/28 Weak Rock: 10 < UCS < 100 ksf
4 Outline 4/28 Drilled Shaft Design in Weak Rock Laboratory q u Measurement Field q u Measurement q u Correlation Summary
5 Axial Capacity 5 L Q skin Q skin Q tip
6 Side Resistance 6/28 Q 0.3 * q 30 ksf skin u
7 Tip Resistance 7/ * / D Q *q *d tip /D 1.3 u c where q t tip resistance, ksf q u unconfined compressive strength, ksf ratio of tip movement to tip diameter,in percent D d c Vesic's depth correction factor *k, dimesionless k L / D L / D 1 k= k tan 1 (L / D) L / D 1 L embedment depth in weak rock, in.
8 Outline 8/28 Drilled Shaft Design in Weak Rock Laboratory q u Measurement Field q u Measurement q u Correlation Summary
9 Shale Coring 9/28
10 Shale Core Recovery 10/28
11 Shale Core Recovery 11/28
12 Outline 12/28 Drilled Shaft Design in Weak Rock Laboratory q u Measurement Field q u Measurement q u Correlation Summary
13 MODIFIED STANDARD PENETRATION TEST Standard Penetration Test (SPT) 140 lbs Hammer drop = 30 inches 18 inches (45 cm) of Penetration (Not Achieved in Soft Shales) 13/28
14 SPT Penetration v. Blowcounts 14/28
15 Initial and Secondary Slopes 15/28
16 Penetration Rate 16/28
17 MSPT Datasheet 17/28
18 MSPT Datasheet 18/28
19 MSPT Procedure 19/28 Baghdady (2017)
20 MSPT Test Procedure 20/28
21 Outline 21/28 Drilled Shaft Design in Weak Rock Laboratory q u Measurement Field q u Measurement q u Correlation Summary
22 IDOT Bridge Sites 22/28 US 24 over Lamoine River, Brown County IL 23 over Short Point Creek, Livingston County T.D.Stark-Drilled Shaft in Weak Rocks
23 Shale Subsurface Investigation 23/28 Phase 1 Phase 2 Last Site Site County District PHASE 1 John Deere Road (IL 5) over IL 84 Rock Island 2 IL 23 over Short Point Creek Livingston 3 FAI 80 over Aux Sable Creek Grundy 3 FAU 6265 LaSalle 3 US 24 over Lamoine River Brown 6 PHASE 2 I-55 over Des Plaines River Will 1 IL 89 over the Illinois River Bureau 3 IL 23 over Otter Creek LaSalle 3 Eldamain Road over Fox River Kendall 3 CH-9 over I-74 Knox 4 US 24 over Big Sister Creek Fulton 4 US 24 over Little sister Creek Fulton 4 US150/IL Rt.1 over Little Vermilion River Vermilion 5 IL108 over Macoupin Creek Macoupin 6 South of Pawnee Bridge Sangamon 6 BL55 over Salt Creek Logan 6 TR 325 over Elm Creek Clay 7 TR 355 over Seminary Creek Clay 7 IL 133 over Embarrass River Coles 7 CH-10 over Buck Creek Clay 7 IL 160 over Silver Creek site Madison 8 21 Shale Sites Drilled Ref.: Willman, H.B., and others, (compilers), 1967, Geologic Map of Illinois: Illinois State Geological Survey, scale= 1:500,000, paper.
24 UCS Correlation 24/28 Energy Corrected for 90% of theoretical energy
25 O-Cell Loadtest 25/28
26 Outline 26/28 Drilled Shaft Design in Weak Rock Laboratory q u Measurement Field q u Measurement q u Correlation Summary
27 Summary 27/28 Improved Drilled Shaft Design in Weak Rocks Cost Savings - Less conservative q u - Less conservative design - Less shale coring & laboratory testing - Shorter design time Implementation - IDOT MSPT Test Method & Spreadsheet
28 Acknowledgements 28/28 William Kramer - TRP Chair, Bridges Bradly Hessing - Bridges Heather Shoup Materials Michael Short District 3 Brian Laningham - District 6 Dan Tobias Materials Greg Heckel District 6 Rob Graeff - District 9 Luke Murphy - Bridges Megan Swanson - Materials Naser Abu-Hejleh - FHWA Michah Loesch - FHWA Chad Hodel WHKS & Co. Terry McCleary - McCleary Engineering Tom Casey - SCI
29 Drilled Shaft Design in Weak Illinois Rocks Timothy D. Stark, James H. Long, & Ahmed Baghdady University of Illinois at Urbana-Champaign Abdolreza Osouli Southern Illinois at Edwardsville THE Conference 2018 Champaign, Illinois February 28, 2018
30 UPDATED MSPT VS. UCS CORRELATION 30/28 T.D.Stark-Drilled Shaft in Weak Rocks
31 When to Use MSPT Case (A): Previously Investigated Sites (i.e., UCS and RQD Available) Determine the Range of UCS for the shales from the Boring logs and Reported Testing, For UCS between 10 and 100 ksf, use MSPT for these materials and rock coring is not required, For UCS >100 ksf, rock coring is required, For UCS < 10 ksf, traditional SPTs and soil testing of the founding materials is needed to measure the UCS.
32 Case (B): New Sites When to Use MSPT Start with Traditional SPT at reasonable intervals (e.g. 2.5 ft): - UCS of split-spoon sample measured using field Rimac - Switch to MSPT if split-spoon sampler is unable to penetrate 18 inches and/or field 10 < UCS < 100 ksf Switch to Rock Coring if field UCS > 100 ksf or penetration < 0.4 inch/last 40 blows
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