Halden silt site Status of work and plans for future. Roselyn Carroll 25 th November 2016
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1 Halden silt site Status of work and plans for future Roselyn Carroll 25 th November 2016
2 Overview of presentation Site location Classification of soil and setting In situ results Integration of data Laboratory results What we have learned so far Plans for future In situ tests Additional larger site Deliverables
3 Project team Roselyn Carroll Halden Project Manager (PM) Øyvind Blaker Engineer & PhD student Priscilla Paniagua Engineer Dissipation testing Sara Bazin - Geophysicist Guillaume Sauvin Geophysicist And many others
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6 Halden site 1 hr 45 mins/130 km drive from Oslo Elevation ~30 m above sea level
7 Overview of Halden silt site
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9 Testing at Halden silt site CPTU: Pagani, Envi, Geotech and Geomil Dissipation tests Seismic: SDTM and SCPTU Resistivity: ERT and RCPTU Pressure meter testing Thermistor string Sampling: 54 composite, 72 mm, block and gelpush* Index and advanced testing XRD and MSCL
10 Geology and units Post-glacial deposit Material: glacial rock flour with clay, quartz and feldspar Marine limit 175 m (Sørensen, 1979) Circa 30 m above sea level Normally consolidated (NC) to lightly over consolidated Blaker, Ø., Carroll, R., L'Heureux, J.-S. & Kluf, M. (2016). Charactersation of Halden silt. 5th International Conference on Geotechnical and Geophysical Site Characterization ISC 5, Brisbane, Australia.
11 MSCL & Scanning Electron Microscope from 8.6m Blaker, Ø., Carroll, R., L'Heureux, J.-S. & Kluf, M. (2016). Charactersation of Halden silt. 5th International Conference on Geotechnical and Geophysical Site Characterization ISC 5, Brisbane, Australia.
12 Plasticity index chart
13 Grain size distribution curves
14 Soil classification triangle NGF (2011)/ EN ISO :2004
15 Soil Classification from CPTU Robertson (1990) Q t -B q SBT chart classify the Halden silt units as clays Schneider et al. (2008) Q t -Du 2 /s vo chart superior for assement of Halden silt Taken from: Blaker, Ø., Carroll, R., L'Heureux, J.-S. & Kluf, M. (2016). Charactersation of Halden silt. 5th International Conference on Geotechnical and Geophysical Site Characterization ISC 5, Brisbane, Australia.
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17 SW ERT 1 ERT 2 NE N W SE ERT 1 vs RCPT (ohm.m) ERT 2 vs RCPT (ohm.m) ERT ,000 Cabel 5,00 5,000 10,00 10,000 ERT 3 15,00 15, planned 20,00 20,000 ERT 2 acquired 25,00 25,000
18 ERT additional lines
19 south P4-160m north P1-160m P6-72m Noise due to buried electric cable SAME GEOMETRIC SCALE SAME COLOR SCALE TOPO FROM DGPS
20 west P3-80m Noise due to buried electric cable SAME COLOR SCALE TOPO FROM DEM east P2-120m P5-120m
21 Depth to bedrock
22 3D model from integration of ERT, BHs & CPTs
23 Piezometer results
24 In situ stress profiles Effective stress influenced by kpa change in pore water pressure
25 Dissipation Tests c v m 2 /s c h m 2 /s k m/s Material sensitive to rig movements Initial data recording challenge Partial drainage Other rates: cm/s
26 Laboratory results (complete/planned) CAUC (11/11) CRS (11/11) IL (4/4) DSS (11/11) Vs on advanced tests (17/17) V so (10/12) plus DSS two stage 6-7 Hydromter (8/8) external Falling drop (18/18) complete Wp/WL (19/19) complete Salt < 1 g NaCl/kg Vs and suction equipment set up in lab at NGI
27 Vs and suction equipement Bender elements Suction probe three probes on block sample BBC Block sample Wavetek function generator coupled with PicoScope digital oscilloscope - sine wave, 20 V p-p, 10 Hz delay - f = ~ 1-7 khz - raw signal or averaged signal Slides courtesy of Prof. DeGroot Amherst University, Massachusetts, USA
28 Halden Silt Site from in situ to laboratory
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31 Block 54 mm with liner 72 mm
32 54 mm with liner Block 72 mm Remoulded
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34 Vs from in situ and laboratory In situ SCPTU SDMT Laboratory Triaxial DSS
35 V s results, unconfined and σʹvo unconfined
36 Plans for future
37 Scale 100m
38 Plans for 2017/2018 Analysis of SDMT, SCPT, Dissipation and pressure meter test results Analysis of laboratory data already collected Gel push sampling and hydraulic fracture testing Further laboratory testing on gel push samples V s and suction probe use more on samples V s change in frequency and effective stress Screen new site and carry out characterisation testing
39 Datamap Halden silt site
40 Deliverables 2017 Published: Blaker, Ø., Carroll, R., L'Heureux, J.-S. & Kluf, M. (2016). Charactersation of Halden silt. 5th International Conference on Geotechnical and Geophysical Site Characterization ISC 5, Brisbane, Australia. Paniagua, P., Carroll, R., L'Heureux, J.-S. & Nordal, S. (2016). Monotonic and dilatory excess pore water dissipations in silt following CPTU at variable penetration rate. 5th International Conference on Geotechnical and Geophysical Site Characterization ISC 5, Brisbane, Australia Ongoing: NGI R Factual report Halden Ongoing and to start: NGI Start: R Interpretation Halden Journal papers: (1) Characterisation, (2) ISA, intact and strain damaged triaxial tests, (3) Assessment of sample quality through comparison of samplers, (4) Plate load testing and others
41 Norwegian GeoTest Sites Thank you for your attention Takk for oppmerksomheten
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