Tunnel
SR 99 Tunnel
Seattle, Washington
Seattle, Washington
-
Completed in
Completed in
2011
2011
The SR 99 Tunnel is a design-build project to replace the Alaskan Way Viaduct in Seattle, Washington. The existing viaduct is a double-deck structure which was severely weakened during the 2001 Nisqually Earthquake. A new tunnel is proposed to be constructed with approximately 54 ft in diameter and 8,800 ft in length using a tunnel boring machine. At the deepest point, the tunnel is about 200 ft below the ground surface. A large segment of the bored tunnel is within glacial and interglacial deposits.
EMI was responsible for seismic design of the tunnel to withstand the specific design earthquake with a 1,000-year return period. Finite-element models were utilized for studying the seismic-induced deformations within the tunnel liner. Two-dimensional models of the tunnel liner and surrounding soils at selected transverse sections were developed to analyze the ovaling deformations of the liner. A three-dimensional beam model of the tunnel liner was used to study axial and bending deformations of the liner system.
























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Fountain Valley (Head office)
17800 Newhope Street
Suite B
Fountain Valley, CA 92708
(714) 751-3826
Inland Empire
765 North Main Street
Suite 136
Corona, CA 92880
(714) 751-3826
San Francisco Bay Area
3541 Investment Boulevard
Suite 4
Hayward, CA 94545
(510) 562-8833
San Diego
820 Los Vallecitos Boulevard
Suite H
San Marcos, CA 92069
(760) 736-8222
At Earth Mechanics Inc. (EMI), your privacy is our priority. We do not collect or use your personal information for marketing purposes. All communications via SMS are strictly conversational in nature and initiated based on your interactions with EMI.
By providing your phone number, you consent to receive occasional, conversational SMS messages from Earth Mechanics Inc. Message frequency may vary, with an average of 1–2 messages per month. SMS numbers are never sold, shared, or disclosed to third parties without your explicit consent, except as required by law. All personal data, including SMS correspondence, is stored securely and handled in accordance with our privacy standards. We do not transfer your information to external organizations under any circumstances unrelated to legal compliance.
This website may include embedded content (e.g., videos, images, or articles) from third-party websites. Such content behaves as if you visited the third-party site directly. These websites may collect data, use cookies, and track your interaction with the embedded content—especially if you are logged in to their platform.
Some media assets used on this site, including video content, are licensed from Adobe Stock under appropriate licensing terms. These assets are used in compliance with Adobe’s Enhanced License, and no attribution is required.
If you have any questions about this policy or your data privacy, please contact us at info@earthmech.com.
Fountain Valley (Head office)
17800 Newhope Street
Suite B
Fountain Valley, CA 92708
(714) 751-3826
Inland Empire
765 North Main Street
Suite 136
Corona, CA 92880
(714) 751-3826
San Francisco Bay Area
3541 Investment Boulevard
Suite 4
Hayward, CA 94545
(510) 562-8833
San Diego
820 Los Vallecitos Boulevard
Suite H
San Marcos, CA 92069
(760) 736-8222
At Earth Mechanics Inc. (EMI), your privacy is our priority. We do not collect or use your personal information for marketing purposes. All communications via SMS are strictly conversational in nature and initiated based on your interactions with EMI.
By providing your phone number, you consent to receive occasional, conversational SMS messages from Earth Mechanics Inc. Message frequency may vary, with an average of 1–2 messages per month. SMS numbers are never sold, shared, or disclosed to third parties without your explicit consent, except as required by law. All personal data, including SMS correspondence, is stored securely and handled in accordance with our privacy standards. We do not transfer your information to external organizations under any circumstances unrelated to legal compliance.
This website may include embedded content (e.g., videos, images, or articles) from third-party websites. Such content behaves as if you visited the third-party site directly. These websites may collect data, use cookies, and track your interaction with the embedded content—especially if you are logged in to their platform.
Some media assets used on this site, including video content, are licensed from Adobe Stock under appropriate licensing terms. These assets are used in compliance with Adobe’s Enhanced License, and no attribution is required.
If you have any questions about this policy or your data privacy, please contact us at info@earthmech.com.
Fountain Valley (Head office)
17800 Newhope Street
Suite B
Fountain Valley, CA 92708
(714) 751-3826
Inland Empire
765 North Main Street
Suite 136
Corona, CA 92880
(714) 751-3826
San Francisco Bay Area
3541 Investment Boulevard
Suite 4
Hayward, CA 94545
(510) 562-8833
San Diego
820 Los Vallecitos Boulevard
Suite H
San Marcos, CA 92069
(760) 736-8222
At Earth Mechanics Inc. (EMI), your privacy is our priority. We do not collect or use your personal information for marketing purposes. All communications via SMS are strictly conversational in nature and initiated based on your interactions with EMI.
By providing your phone number, you consent to receive occasional, conversational SMS messages from Earth Mechanics Inc. Message frequency may vary, with an average of 1–2 messages per month. SMS numbers are never sold, shared, or disclosed to third parties without your explicit consent, except as required by law. All personal data, including SMS correspondence, is stored securely and handled in accordance with our privacy standards. We do not transfer your information to external organizations under any circumstances unrelated to legal compliance.
This website may include embedded content (e.g., videos, images, or articles) from third-party websites. Such content behaves as if you visited the third-party site directly. These websites may collect data, use cookies, and track your interaction with the embedded content—especially if you are logged in to their platform.
Some media assets used on this site, including video content, are licensed from Adobe Stock under appropriate licensing terms. These assets are used in compliance with Adobe’s Enhanced License, and no attribution is required.
If you have any questions about this policy or your data privacy, please contact us at info@earthmech.com.
Fountain Valley (Head office)
17800 Newhope Street
Suite B
Fountain Valley, CA 92708
(714) 751-3826
Inland Empire
765 North Main Street
Suite 136
Corona, CA 92880
(714) 751-3826
San Francisco Bay Area
3541 Investment Boulevard
Suite 4
Hayward, CA 94545
(510) 562-8833
San Diego
820 Los Vallecitos Boulevard
Suite H
San Marcos, CA 92069
(760) 736-8222
At Earth Mechanics Inc. (EMI), your privacy is our priority. We do not collect or use your personal information for marketing purposes. All communications via SMS are strictly conversational in nature and initiated based on your interactions with EMI.
By providing your phone number, you consent to receive occasional, conversational SMS messages from Earth Mechanics Inc. Message frequency may vary, with an average of 1–2 messages per month. SMS numbers are never sold, shared, or disclosed to third parties without your explicit consent, except as required by law. All personal data, including SMS correspondence, is stored securely and handled in accordance with our privacy standards. We do not transfer your information to external organizations under any circumstances unrelated to legal compliance.
This website may include embedded content (e.g., videos, images, or articles) from third-party websites. Such content behaves as if you visited the third-party site directly. These websites may collect data, use cookies, and track your interaction with the embedded content—especially if you are logged in to their platform.
Some media assets used on this site, including video content, are licensed from Adobe Stock under appropriate licensing terms. These assets are used in compliance with Adobe’s Enhanced License, and no attribution is required.
If you have any questions about this policy or your data privacy, please contact us at info@earthmech.com.