minnesota department of transportation 1400 gervais avenue, … · 2019-05-09 · sp 3408-18 th 23...

Minnesota Department of Transportation Office of Materials & Road Research 1400 Gervais Avenue, Maplewood, MN 55109

Memo Date: February 14th, 2017 To: Ryan Barney, Project Manager

District 8 Willmar From: Derek Stecker, Graduate Engineer Trainee Geotechnical Engineering Section Concur: Rich Lamb, Foundations Engineer Geotechnical Engineering Section Subject: SP 3408-18 (District 8) Culvert # 34X06 TH 23 Under DNR Pedestrian Trail located at junction of CR 135 Foundation Investigation and Recommendations

1.0 Project Description This report provides a Foundation Investigation and Recommendations for construction of a single line of 8’x7’ reinforced concrete box culvert (Bridge #34X06) for pedestrian traffic. 2.0 Subsurface Investigation Three Standard Penetration Tests (SPT) Borings were performed in January of 2017 near the proposed box culvert location. Copies of these SPT Boring logs are included with this report. The soils encountered at the proposed location consisted of 8 to 12 ft. of loamy sand followed by sand and gravel until the borings terminated at a depth of 33 to 36 ft. Groundwater was encountered at a depth of 17 to 22 ft. in all three borings (Approximate elevation of 1215 ft.). Refer to the attached boring logs for a more detailed and complete description of the foundation soils. 3.0 Foundation Analysis The proposed box culvert was analyzed for a shallow foundation (spread footing). The bottom of the culvert was assumed to be the footing during analysis. The approximate bottom of footing elevation is in the range of 1223 to 1224 ft. The soils below the proposed culvert location were determined to have adequate bearing capacity. 3.1 Settlement In order to keep settlement below 1 in. and to provide for a uniform foundation base, it is recommended to have a 2 ft. (minimum) subcut filled with Aggregate Bedding beneath the bottom of the footing. It is also recommended that a geosynthetic layer be place at the base of the subcut to provide separation between fine and coarse grained materials

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SP 3408-18 TH 23 Culvert 34X06 Foundation Investigation and Recommendations

February 14, 2017

4.0 Recommendations Based on the existing conditions along with an analysis of the project soils, we recommend the following:

1. A 2 ft. minimum Coarse Aggregate Bedding (MnDOT Spec 3149.2G.2) compacted to 95% of Standard Proctor be placed below the proposed bottom of culvert to reduce settlement and provide for a uniform foundation base.

2. A MnDOT Type V separation geosynthetic (MnDOT Spec. 3733) should be place at the base of the subcut excavation between the native soils and the replacement backfill. The geosynthetic should extend at least 5 ft. beyond the side walls of the box culvert.

3. The trench for the culvert replacement be excavated down at a 1:1.5 (V:H) slope and should include a 1:20 taper for frost differential protection

Attachments: Plan View Profile View SPT Boring Logs (T100, T101, T102)-Unique Numbers (81611, 81612, 81613) Cc: Brad Skow Cody Brand Angel Staples

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8.01227.0

33.01202.0

9

6

5

5

4

7

21

21

20

18

19

1050/.5

Coarse Loamy Sand and Gravel with IOS, browns, damp

Sand and Gravel with a seam if Fine Sand at 20.0', browns,damp to saturated

Bottom of Hole -33.0'Water measured at 19.0' with auger

57

20

27

27

33

15

39

21

36

40

State Project Bridge No. or Job Desc.

T100Trunk Highway/Location

CULVERTGround Elevation

(DTM)MN Trunk Highway TH 23Boring No.

3408-18 1235.0(ft.) Drill Machine

HammerLongitude (West)=94°51'57.01"Drilling

SHEET 1 of 1

Latitude (North)=45°20'05.74"

Kandiyohi Coord:X=470209 Y=261750Location 207184 CME 850 Track

No Station-Offset Information Available

CME Automatic Calibrated 1/24/17Completed

or Member

UNIQUE NUMBER 81611

Depth

COH

Soil Class:JAH Rock Class: Edit: Date: 2/6/17

Breaks

Or Remarks

Elev.

SPT

REC ACL

Dril

ling

Ope

ratio

n

Lith

olog

y

RQD Core

Index Sheet Code 3.0G:\GINT\PROJECTS-ACTIVE\3408-18.GPJ

Roc

k

DE

PT

H

(psf)

(%)

U.S. Customary Units

5

10

15

20

25

30

(%) (ft)

(pcf)N60

Formation

Soi

lMC(%)

Classification

Other Tests

MINNESOTA DEPARTMENT OF TRANSPORTATION - GEOTECHNICAL SECTION

LABORATORY LOG & TEST RESULTS - SUBSURFACE EXPLORATION

rock in SPT shoe

rough cobbly drilling

11.51225.0

34.51202.0

16

9

6

9

20

19

19

Loamy Sand and Gravel with IOS at 9.0', browns, damp tomoist

Sand and Gravel, browns, moist to saturated


30

38

26

56

8

35

25







SHEET 1 of 1





or Member

UNIQUE NUMBER 81612

Depth

COH


Breaks

Or Remarks

Elev.

SPT

REC ACL

Dril

ling

Ope

ratio

n

Lith

olog

y

RQD Core


Roc

k

DE

PT

H

(psf)

(%)


5

10

15

20

25

30

(%) (ft)

(pcf)N60

Formation

Soi

lMC(%)

Classification

Other Tests



Sand Heave in auger

11.51220.8

35.51196.8

9

6

4

16

24

17

16

Coarse Loamy Sand and Gravel with IOS at 5.0', browns, moist

Sand and Gravel, browns, moist to saturated


34

62

23

25

23

23

26







SHEET 1 of 1





or Member

UNIQUE NUMBER 81613

Depth

COH


Breaks

Or Remarks

Elev.

SPT

REC ACL

Dril

ling

Ope

ratio

n

Lith

olog

y

RQD Core


Roc

k

DE

PT

H

(psf)

(%)


5

10

15

20

25

30

35

(%) (ft)

(pcf)N60

Formation

Soi

lMC(%)

Classification

Other Tests



1.0' sand heave

minnesota department of transportation 1400 gervais avenue, … · 2019-05-09 · sp 3408-18 th 23...

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