2009 Geotechnical Consultants Workshop
MSE Walls Updates
Jawdat Siddiqi, P.E.
Office of Structural Engineering
MSE Walls Updates
• April, 2009 Updates:
◦ Bridge Design Manual
Section 204.6.2.1 Stage 1 Detail Design Submission for
Proprietary Walls
Section 303.5.1 Wall Design Requirements for Proprietary
Retaining Walls-Work Performed by the Design Agency
Figures 303.5.1-1, 303.5.1-2, 303.5.1-3 303.5.1-5,
303.5.1-6 & 303.5.1-7
ODOT-Office of Structural Engineering
Previous 2004 BDM Sec 204.6.2.1
RequirementsDetermine the height of the wall (h) for minimum soil
reinforcement lengths as follows:
When the surface of the retained soil is level, measure
(h) from the top of the concrete leveling pad to the top
of the concrete coping.
When the surface of the retained soil is sloping,
measure (h) as shown in AASHTO Figure 5.8.2B.
When the surface of the retained soil is supporting an
abutment, measure (h) from the top of the concrete
leveling pad to the profile grade elevation at the face of
the wall.
ODOT-Office of Structural Engineering
Current 2004 BDM Sec 204.6.2.1
RequirementsDetermine the height of the wall (H) for minimum soil
reinforcement lengths as follows:
If the wall is not located at an abutment, measure (H) as
the elevation difference between the top of the wall
where the finished grade intersects the back face of the
wall and the top of the leveling pad (AASHTO Article
5.8.1).
If the wall is located at an abutment, measure (H) as the
elevation difference between the profile grade at the
face of the wall and the top of the leveling pad.
ODOT-Office of Structural Engineering
Current 2004 BDM Sec 204.6.2.1
Requirements The soil reinforcement length shall not be less than 70%
of the wall height (H) or 8’-0” [2.5 m], whichever is
greater. Only increase this minimum soil reinforcement
length as necessary to meet external stability
requirements (sliding, bearing resistance, overturning,
overall global stability). Generally, the soil
reinforcement length should not be greater than 150%
of the wall height (H). Provide calculations with the
Foundation Report, BDM Section 202.2.3, that justify
soil reinforcement lengths exceeding 0.70H.
ODOT-Office of Structural Engineering
MSE Wall SS840 updated
o Supplement Specifications (SS 840)
Pipe Sleeves Material, if recycled polyethylene,
submit certified test data conforms ASTM F 2648
Include a live load surcharge of 250 psf unless the
backfill above the wall is sloped steeper than 4H:1V
ODOT-Office of Structural Engineering
Design Requirements
Specify soil reinforcement length in the
plans only if the soil reinforcement length
greater than 70% of the wall height is
needed for external stability.
ODOT-Office of Structural Engineering
BDM Section 303.5.1 Updates
6” corrugated perforated plastic pipe with filter fabric,
no porous backfill within the limit of SGB
Pay limits for wall and roadway quantities
Soil reinforcements attached to abutments
◦ Regardless of abutment type and foundation type, minimum of
one row of soil reinforcements shall be attached to the backside
of the abutment footing.
◦ These additional reinforcements are necessary to resist
horizontal bridge and backwall forces, and to prevent load
transfer to the coping and facing panels.
◦ To estimate select granular backfill quantities, Designer’s may
assume these additional reinforcements to be of the same length
as those attached to the facing panels.
ODOT-Office of Structural Engineering
BDM April, 2009 Figures updates
The 1:1 Slope was eliminated
6” corrugated perforated plastic pipe with
filter fabric, no porous backfill within the
limit of SGB
Pay limits for MSE wall and roadway
quantities
ODOT-Office of Structural Engineering
Back to Back MSE Walls• Separation between 203 Embankment and SGB
◦
ODOT-Office of Structural Engineering
Back to Back MSE Walls• Separation between 203 Embankment and SGB
◦
ODOT-Office of Structural Engineering
Preferred Geometry for MSE wall
Supporting Bridge Abutment
• Straight Walls
•Turned back walls up to 45 degree
• Curved walls
•Turned back walls up to 90 degree
• Avoid acute corners
ODOT-Office of Structural Engineering
General Requirements
Frictional resistance against sliding should be
obtained using the coefficient (f =tan
Foundation Report for MSE Wall Supporting
Bridge Abutment (BDM 202.2.3)◦ Calculations for bearing pressure and bearing capacity for the in-
situ materials below the MSE wall.
◦ Settlement Calculations.
◦ Consider the effect of settlement.
◦ Include all construction constraints, such as soil improvement
method, that may be required.
ODOT-Office of Structural Engineering
MSE Wall Shop Drawings Submittal
Submit four copies of the working drawings, design
calculations and acceptance letter to the Engineer at least 30
days before construction.
Submit drawings and calculations in electronic format.
The Engineer will submit the drawings and calculations to the
Office of Structural Engineering for review. The review is
performed within 21 days of receiving the submission.
MSE wall Questions - OSE
Jawdat Siddiqi, P.E
Assistant Administrator/Foundation Engineer
Bashar Al-Tarawneh, Ph.D., P.E.
Foundation Engineering Coordinator
ODOT-Office of Structural Engineering