Wet soil mix circular shaft with plug Designed and constructed by Hayward Baker with our Hillsbororough River, Tampa, Florida, USA The...

New Tapan Zee Bridge Cofferdams Designed with Construction of the $3.9 billion new Tapan Zee Bridge in New York required that cofferdams...

Additional Deep Excavation Case Studies The following table provides basic information on additional case studied for deep excavations. The majority of the deep excavations are supported by slurry walls. Wall Types: RCDW: Reinforced Concrete Diaphragm Wall, SPTC: Soldier Pile & Tremie Wall, SPW: Sheet Pile Wall, SP: Soldier Pile and Lagging, TPW: Tangent Pile Wall, SMW: Soil Mix Wall ​Project Name ​Year ​RCDW Exc. Depth (feet) System System ​General Soil Conditions ​ State Tr

Cellular concrete backfill behind soldier pile wall can result in cost savings In many cases one might have to backfill over soft soil and carry a heavy load (such as a railway). One approach to stabilizing such a retaining wall is to construct a soldier pile wall system and fill the space behind the soldier pile wall with structural backfill. The density of the structural backfill would be in the order of 120 to 125 pcf (19 kN/m3), and will exert a considerable load on the s

World Trade Center "Bathtub" Diaphragm Walls, New York, NY The tragic events of 9/11/01 have left few people untouched. One of the greatest "heroes" of the day has been the "bathtub" of the World Trade Center, being able to resist the tremendous forces generated by the destruction while holding back the Hudson river from entering the New York City tunnel system. The "bathtub", is actually a 3 ft thick (0.91 m) structural slurry wall that keeps water and soil out of the excava

Slurry Walls Case Study: Washington Convention Center, Washington D.C. The Washington Convention Center project occupies five and one half city blocks between Mt. Vernon Place NW on the south and N Street on the north and from 7th Street NW on the east into 9th Street NW on the west, in Washington DC. The project is at the present time the largest single basement slurry wall excavation in the United States. The excavation site is approximately 1480' long by 500' wide, and enc

Slurry Wall Excavation Case Study: Post Office Square Garage, Boston, MA The Post Office Square Garage includes a 7-level, 75'-deep underground garage, constructed with the top/down method, bounded by Franklin, Milk, Pearl, and Congress Streets. Existing buildings up to 40 stories tall are located adjacent to the site. Basement excavation was completed in 1990. A perimeter slurry wall, 3.0' thick, extended approximately 10ft into bedrock, provided both the temporary and perma

Diaphragm Wall Excavation Case Stydy: Prudential Two, Chicago, IL The Prudential Two is a 60-story high-rise located in the southwestern corner of Stenson Avenue & Lake Street. The new building was constructed next to the pre-existing 41-story Prudential building at Randolph & Stenson Streets. Five levels of parking were constructed under the tower portion of the site. Three out of these parking levels are below the lower street level at Stenson Street (eastern side). Stenson

Measured vs. Theoretical Ground Anchor Loads for a 21.2m Deep Excavation in Santiago, Chile Occasionally we get a chance to compare measured deep excavation performance against different methods. This 21.2m deep excavation case history in Santiago, Chile compares various conventional methods against measured ground anchor loads. The excavation was constructed in competent cohesive gravels and was supported by two levels of ground anchors and 0.8m diameter reinforced concrete

Performance of T-Shaped Diaphragm Wall in Taiwan The performance of a T-shaped diaphragm wall supported 9.7m deep excavation in Taiwan is compared to an analysis with our DeepEX software. The original excavation performance was presented in a paper by H. Hsii Sheng Hsieh, et. al., 2011 (Journal of Geoengineering Vol. 6). The deep excavation was supported by T-shaped diaphragm wall with partial implementation of the top-down bracing method, Figure 1 presents a plan of the ex

An independent deep excavation analysis model for the repair shaft of the Seattle Viaduct (14/Jan/2015) The repair works for the Seattle Viaduct (Bertha) have been again on the news. Fox news pointed out to a "draft" report by an engineering firm that used words as catastrophic failure ( here is the article ). The final report used different language, but the press always wants to jump on anything that sounds scary. We wanted to check the circular shaft with our deep excavati

Excavation in Abu Dhabi - Model Comparison with DeepEX, FREW, and Plaxis 2D NSCC International in 2015 presented a paper on a deep excavation performance for the Emirates Pearl Tower and Bab El Qasr Hotel in Abu Dhabi. The paper was presented in DFI 2015 by Dr. Walid Jaber & Amr Al Degwe. The 20m deep excavation was supported by a 1.0m thick reinforced diaphragm wall with most of the excavation braced with three levels of ground anchors. In one corner, the excavation was supp

Reanalysis of metro excavation in Taipei with diaphragm wall and steel struts An 18m deep excavation supported by a 1m reinforced concrete diaphragm wall and steel struts in soft to medium stiff clays, in Taipei was reanalyzed with the DeepEX software program. The excavation was originally presented in a paper by Hsiao-Chou Chao, Richard N. Hwang, and Chung-Tien Chin (Moh and Associates), in the 2010 earth retention conference 3 (Aug 1-4, Bellevue, WA). In the original public

Comparison of finite element and limit equilibrium analysis models for a 34m Deep Excavation Three Stepped Bored Pile Walls This case examines a 34m deep excavation with three stepped bored pile walls braced by a series of ground anchors. The excavation is in soft type rock material with an effective cohesion of 25 kPa and a friction angle of 35 degrees. The wall consists of 0.8m diameter bored piles at 2.0m horizontal spacing. The 1st and 2nd benches are at 12m and 24m depth

Learn how to Avert a Potential Failure! In this case study we will evaluate a 16.1 m deep excavation supported by an anchored bored pile wall that collapsed during construction. The model is simulated and reanalyzed with the DeepEX software program. The excavation was originally published in a paper by Devrim Alkaya and Burak YesilL (International Journal of the Physical Sciences Vol. 6(25), pp. 6009-6024, 23 October, 2011). In the original publication, the authors presented

Excavation in Jakarta - Displacement Prediction with Different Analysis Methods A. INTRODUCTION A deep excavation in Jakarta Indonesia...

Analysis of Deep Excavation in Boston Blue Clay with Hardening Soil Model, Limit-Equilibrium and Winkler Analysis Methods The basement of...

Displacements on Existing Tunnels from Adjacent Deep Excavation in Los Angeles A. INTRODUCTION A soldier pile deep excavation in Los...