Data from ring shear strength testing of glaciolacustrine silty clay from the 2014, Oso, Washington landslide

Citation

Schulz, W.H., Wang, Gonghui, Jiang, Yao, Collins, B.D., and Reid, M.E., 2017, Data from ring shear strength testing of glaciolacustrine silty clay from the 2014, Oso, Washington landslide: U.S. Geological Survey data release, https://doi.org/10.5066/F7KH0KSD.

Summary

We performed ring shear strength testing of three specimens from a glaciolacustrine silty clay unit involved in a large landslide that occurred March 22, 2014 near the town of Oso, Washington. Ring shear tests utilized apparatus DPRI-5 at Kyoto University, Japan and test results are presented herein. We refer to the specimens as the clay, clayey silt, and silt. Some tests were performed under controlled shear stress with shear stress increased at ~0.5 kPa/s until failure and failure was permitted to continue for decimeters to meters of cumulative shear displacement. These tests were performed on unfailed material and on fault gouge that developed during failure. Other tests were performed on fault gouge under constant shear displacement rates of ~0.001–10 cm/s. Nearly all controlled shear stress tests were performed in the undrained condition (specimen chamber water lines closed) and nearly all constant shear displacement rate tests were performed in the naturally drained condition (specimen chamber water lines open). Normal stress was controlled during all tests. Cumulative shear displacement, normal stress, shear stress, pore-water pressure, and specimen thickness were continuously measured during each test. Recording of these parameters continued during hold periods after shearing ceased for many tests. Recording similarly continued during many consolidation periods that followed shearing or hold periods. Consolidation involved opening specimen chamber drainage lines to permit excess pore-water pressure (if any) to dissipate and specimen thickness to stabilize under the applied normal stress.

File names indicate testing conditions. For controlled shear stress tests, file names are: specimen_”drained” or “undrained”_normal stress_”controlled shear stress”_”unfailed” or “gouge”.txt and subsequent hold and consolidation file names are: specimen_”hold” or “consolidation”_normal stress_”controlled shear stress”_ ”unfailed” or “gouge”.txt. For constant shear displacement rate tests, file names are: specimen_”drained” or “undrained”_normal stress_shear displacement rate.txt and subsequent hold and consolidation file names are: specimen_”hold” or “consolidation”_normal stress_shear displacement rate.txt. In some cases, recording was made to one file during shearing, hold, and consolidation periods. For these, file names indicate shearing conditions as described above with “hold” and/or “consolidation” appended to the end of the file name.

These data support a study described in Schulz, W.H., Wang, G., Jiang, Y., Collins, B.D., and Reid, M.E., 2017, Fault gouge structure control on post-failure behavior of granular material-clay mixtures: ###################################.

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Attached Files

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metadata.xml Original FGDC Metadata	View	11.55 KB	application/fgdc+xml
clay_consolidation_100kPa_0.005cms.txt		91.46 KB	text/plain
clay_consolidation_100kPa_controlled shear stress_gouge.txt		150.74 KB	text/plain
clay_consolidation_100kPa_0.1cms.txt		91.47 KB	text/plain
clay_consolidation_100kPa_5.497cms.txt		188.06 KB	text/plain
clay_consolidation_200kPa_controlled shear stress_unfailed.txt		291.42 KB	text/plain
clay_consolidation_400kPa_0.001cms.txt		113.77 KB	text/plain
clay_consolidation_400kPa_0.01cms.txt		183.42 KB	text/plain
clay_consolidation_400kPa_controlled shear stress_unfailed.txt		166.47 KB	text/plain
clay_consolidation_400kPa_5.5cms.txt		220.12 KB	text/plain
clay_consolidation_400kPa_controlled shear stress_gouge.txt		240.14 KB	text/plain
clay_consolidation_400kPa_0.1cms.txt		197.7 KB	text/plain
clay_consolidation_400kPa_1.001cms.txt		125.8 KB	text/plain
clay_consolidation_200kPa_controlled shear stress_gouge.txt		222.6 KB	text/plain
clay_drained_100kPa_5.497cms_hold.txt		759.63 KB	text/plain
clay_consolidation_200kPa_0.001cms.txt		98.57 KB	text/plain
clay_drained_400kPa_1.001cms_hold.txt		672.94 KB	text/plain
clay_drained_400kPa_0.01cms_hold.txt		614.81 KB	text/plain
clay_consolidation_100kPa_controlled shear stress_unfailed.txt		357.31 KB	text/plain
clay_hold_400kPa_controlled shear stress_unfailed.txt		451.67 KB	text/plain
clay_drained_400kPa_controlled shear stress_gouge_hold.txt		950.22 KB	text/plain
clayey silt_consolidation_200kPa_controlled shear stress_unfailed.txt		140.93 KB	text/plain
clayey silt_consolidation_200kPa_controlled shear stress_gouge.txt		834 KB	text/plain
clay_undrained_100kPa_controlled shear stress_gouge_hold.txt		865.75 KB	text/plain
clayey_silt_consolidation_400kPa_controlled shear stress_unfailed.txt		262.25 KB	text/plain
clayey silt_undrained_200kPa_controlled shear stress_unfailed.txt		268.91 KB	text/plain
clayey silt_undrained_200kPa_controlled shear stress_gouge.txt		299.45 KB	text/plain
clayey_silt_consolidation_400kPa_controlled shear stress_gouge.txt		96.06 KB	text/plain
clayey_silt_drained_400kPa_0.114cms.txt		406.38 KB	text/plain
clayey_silt_drained_400kPa_8.083cms.txt		395.74 KB	text/plain
clayey_silt_hold_400kPa_0.011cms.txt		22.51 KB	text/plain
clayey_silt_hold_400kPa_0.001cms.txt		78.63 KB	text/plain
clayey_silt_drained_400kPa_1.157cms.txt		740.38 KB	text/plain
clayey_silt_undrained_200kPa_6.957cms_consolidation.txt		437.1 KB	text/plain
clayey_silt_undrained_400kPa_controlled shear stress_gouge_hold.txt		685.04 KB	text/plain
silt_consolidation_400kPa_0.113cms.txt		65.85 KB	text/plain
silt_consolidation_400kPa_controlled shear stress_gouge.txt		251.03 KB	text/plain
clayey_silt_undrained_400kPa_controlled shear stress_unfailed_hold.txt		952.46 KB	text/plain
silt_drained_100kPa_0.112cms.txt		148.36 KB	text/plain
silt_drained_100kPa_1.148cms_hold.txt		87.27 KB	text/plain
silt_drained_200kPa_0.113cms_hold.txt		65.63 KB	text/plain
silt_drained_300kPa_0.112cms.txt		187.5 KB	text/plain
clayey_silt_undrained_800kPa_controlled shear stress_unfailed.txt		350.65 KB	text/plain
silt_drained_400kPa_0.113cms.txt		161.43 KB	text/plain
silt_drained_400kPa_5.761cms.txt		224.18 KB	text/plain
silt_hold_100kPa_0.112cms.txt		25.07 KB	text/plain
silt_drained_400kPa_9.165cms_hold.txt		325.48 KB	text/plain
silt_hold_300kPa_0.112cms.txt		41.86 KB	text/plain
silt_undrained_200kPa_controlled shear stress_unfailed_hold.txt		500.59 KB	text/plain
silt_hold_800kPa_controlled shear stress_unfailed.txt		344.16 KB	text/plain
silt_undrained_100kPa_controlled shear stress_unfailed.txt		360.25 KB	text/plain
silt_hold_100kPa_0.001cms.txt		103.74 KB	text/plain
silt_undrained_800kPa_controlled shear stress_unfailed.txt		438.93 KB	text/plain
silt_undrained_200kPa_controlled shear stress_gouge_hold.txt		604.23 KB	text/plain
clay_drained_400kPa_5.5cms_hold.txt		1,001.6 KB	text/plain
clay_drained_400kPa_0.001cms_hold.txt		1.1 MB	text/plain
clay_undrained_200kPa_controlled shear stress_unfailed_hold.txt		1,006.73 KB	text/plain
clayey_silt_consolidation_400kPa_1.157cms.txt		1.11 MB	text/plain
clay_undrained_100kPa_controlled shear stress_unfailed_hold.txt		1.07 MB	text/plain
clay_undrained_200kPa_controlled shear stress_gouge_hold.txt		1.37 MB	text/plain
clayey_silt_drained_200kPa_0.114cms.txt		984.52 KB	text/plain
clayey_silt_drained_200kPa_0.011cms.txt		1.5 MB	text/plain
clayey_silt_drained_200kPa_1.159cms.txt		1.6 MB	text/plain
clayey_silt_drained_400kPa_0.011cms_hold.txt		1.57 MB	text/plain
clayey_silt_hold_200kPa_1.159cms.txt		1.81 MB	text/plain
silt_hold_consolidation_100kPa_controlled shear stress_unfailed.txt		1.17 MB	text/plain
clay_drained_200kPa_0.001cms.txt		1.99 MB	text/plain
clay_drained_100kPa_0.005cms.txt		2.01 MB	text/plain
clay_undrained_400kPa_controlled shear stress_unfailed.txt		1.98 MB	text/plain
clay_drained_400kPa_0.1cms_hold.txt		2.71 MB	text/plain
clayey_silt_consolidation_800kPa_controlled shear stress_unfailed.txt		2.42 MB	text/plain
silt_drained_100kPa_0.001cms.txt		2.82 MB	text/plain
clayey_silt_drained_400kPa_0.001cms.txt		2.04 MB	text/plain
silt_drained_200kPa_5.75cms_hold.txt		2.29 MB	text/plain
silt_undrained_400kPa_controlled shear stress_gouge.txt		1.98 MB	text/plain
silt_hold_400kPa_controlled shear stress_gouge.txt		2.13 MB	text/plain
clayey silt_drained_200kPa_0.001cms_hold_consolidation.txt		3.56 MB	text/plain
clayey_silt_hold_200kPa_0.114cms.txt		3.53 MB	text/plain
silt_drained_300kPa_0.001cms.txt		3.6 MB	text/plain
silt_drained_400kPa_0.001cms.txt		3.26 MB	text/plain
silt_drained_200kPa_0.001cms.txt		3.09 MB	text/plain
clay_drained_100kPa_0.1cms_hold.txt		4.62 MB	text/plain
read_me.txt		854 Bytes	text/plain

Purpose

Shear resistance and its variation during ongoing failure exerts a primary control on landslide motion. The landslide near Oso displayed great mobility and occurred mostly in the glaciolacustrine silty clay unit. We performed advanced shear strength testing on this material to gain insight into factors contributing to the landslide’s mobility and to better understand mechanisms contributing to shear strength variability in silt-clay mixtures, in general.

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Type	Scheme	Key
DOI	https://www.sciencebase.gov/vocab/category/item/identifier	doi:10.5066/F7KH0KSD

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Data from ring shear strength testing of glaciolacustrine silty clay from the 2014, Oso, Washington landslide

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