Locale : North America (English)
X
1 / 1
Close
Crane on the embankment

Thrandeston Bog embankment stabilization, UK

We applied an innovative ground improvement technique, dry soil mixing, to stabilize a railway embankment on the Great Eastern route from London to Norwich.

Savings
70%
EMBODIED CARBON
50%
COST

Challenge

The Thrandeston Bog embankment, on the Great Eastern route from London to Norwich, is 16 feet (5 meters) high and 2,133 feet (650 meters) long.

The embankment suffered from continual settlement and was in danger of failure. Thrandeston Bog consists of 33 feet (10 meters) of peat and very soft clays over chalk.

Solution

For the client Network Rail, we carried out research and trials to demonstrate the viability of dry soil mixing, a technique previously untried on British railways. Dry soil mixing uses an augur to whisk cement powder into the ground, creating columns of stiff material.

The reference design for the project consisted of 1,200 tubular steel piles measuring 36 inches (914 mm) in diameter and with a combined length of 11 miles (18 kilometers), forming continuous retaining structures on either side of the embankment.

Outcome

The cost of cement for the matrix of 11,500 soil mix columns was less than 50% the cost of steel piles. 5500 metric tons of cement powder were used instead of 7,300 metric tons of steel. Embodied carbon dioxide emissions totaled 5,400 metric tons instead of 17,600. Fewer vehicle movements were also required.

One benefit of the technique was that plant that could be used adjacent to the live railway and within 9 feet (2.75 meters) of the overhead lines.

icon-arrow-down-sml icon-arrow-left-lrg icon-arrow-left-sml icon-arrow-right-lrg icon-arrow-right-sml icon-arrow-up-sml icon-champions icon-close icon-download icon-education icon-email icon-grid-view icon-language icon-link-to icon-list-view icon-location icon-login-register icon-minus icon-more icon-phone icon-plus icon-recently-viewed icon-search icon hash key-facts-corner-sash quote-underline social-icon-facebook social-icon-googleplus social-icon-linkedin social-icon-twitter social-share-icon-facebook social-share-icon-facebook social-share-icon-googleplus social-share-icon-googleplus social-share-icon-instagram social-share-icon-instagram social-share-icon-linkedin social-share-icon-linkedin social-share-icon-twitter social-share-icon-twitter social-share-icon-youtube social-share-icon-youtube sina-weibo MM-Shape01-Quote-Views MM-Shape03-Quote-Locations MM-Shape05-Quote-Projects MM-Shape12-Quote-Sectors MM-Shape13-Quote-Expertise MM-Shape14-Quote-About-Us MM-Shape14-Quote-Careers checkmark icon-expand-view icon-apply-now menu sphere icon-cookies icon-legal icon-registered-companies target rotate-screen video-replay-flat video-replay audio-mute audio-play