May/June 2024 - 14

COVER
&
STORY
SPECIAL
ISSUE
Anchored Wall Advantages Along I-95
Traveling from Maine to Florida, I-95 is the U.S.' longest
North-South interstate and has been growing and expanding
through the Mid-Atlantic. In Maryland, the I-95 Express Toll
Lanes projects created new toll lanes to relieve congestion
and increase quality of life for numerous communities along
the interstate, according to project owner, the Maryland
Transportation Authority (MDTA). Many of these projects
also included replacing or rehabilitating bridges and
constructing new noise walls, as well as retaining walls, as
I-95 expands to accommodate the new lanes.
The focus of this article is the I-95 Express Toll Lane
Northbound Extension from MD 43 to south of MD 152. This
project contains 11 large retaining walls with some of these
walls combined with noise walls. Many of these projects join
other adjacent I-95 toll lane expansions, which makes timing
14 * DEEP FOUNDATIONS * MAY/JUNE 2024
AUTHORS Ed Laczynski, P.E., Wagman Heavy Civil
Suggesting Design Changes
The project's geologic location on the border of the piedmont
and coastal plains means the I-95 project goes through both
geologies. The site contains mostly dense silty sand with
varying levels of decomposed rock to hard rock identified as
Gabbro and Gneiss depending on where you are on the site. The
rock is very hard and could easily exceed 20,000 psi (138,000 kPA).
The depths of hard rock varied throughout but were often
shallow enough to utilize as a foundation element. Additionally,
in many cases, water could be found on top of the rock.
Wall installed below power lines
critical and scheduling very important. In this particular
project, all of the major retaining walls were on one side of
I-95 and built in one phase that created scheduling and
logistical challenges.
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May/June 2024

Table of Contents for the Digital Edition of May/June 2024

TOC
May/June 2024 - Intro
May/June 2024 - 1
May/June 2024 - 2
May/June 2024 - TOC
May/June 2024 - 4
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