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Texas Capitol Complex Phase 1 Expansion to be Featured at Conference

Charles Luxford to Speak at ASCE Texas Civil Engineering Conference 2021

Charles Luxford -Construction Design and Contractor Support Sector Leader - Brierley AssociatesCharles Luxford, PE, SE, PEng, will present on the Texas Capitol Complex Phase 1 Expansion at the upcoming ASCE Texas Civil Engineering Conference, September 15-17, 2021. The conference takes place at Embassy Suites by Hilton San Marcos Hotel in San Marcos, Texas.

The talk will feature expansion of the Capitol Complex in Austin. Phase 1 of this expansion will add two new State office buildings and five levels of underground parking to the existing Complex. Additionally, a landscaped pedestrian mall will be built atop a portion of the underground parking to enhance the area as a cultural destination.

Brierley Associates was selected to provide detailed design of the entire Phase 1 earth retention system for an approximately 40-65 ft (12-20 m) deep, 500,000+ yd3 (380,000+ m3) excavation through overburden soils and limestone bedrock. To facilitate overall project coordination, all design packages were required to develop Revit models, including the retention system package. With the project located in an urban setting, this 3D model also facilitated coordination of the retention system with adjacent major structures and utilities.

The retention system is a combination of soil nails, soldier piling with tiebacks and rock anchors with a shotcrete facing as a substrate for the below-grade blindside waterproofing system. Due to the substantial scope of excavation, a significant number of utilities had to be routed on a temporary span over the excavation. Brierley Associates designed this utility support structure, which required extensive coordination with the excavation support and existing utilities located directly underneath the structure’s foundations. Preconstruction geotechnical work identified a small displacement fault that might be encountered within the excavation; however, construction observations determined it to be in a much more adverse location and orientation than originally anticipated. Charles’ presentation outlines the original design of the retention system and utility support structure within a BIM model and illustrates the field observations that led to a significant design change during construction.

Capitol Complex Excavation Austin TX
3D Revit Model of Capital Complex, Austin, TX
3D Revit Model of Capital Complex, Austin, TX

The Capital Complex expansion was also recently featured in Deep Foundations Magazine.

Conference Information:

ASCE Texas Civil Engineering Conference 2021

Dates: Wednesday-Friday, September 15-17, 2021

Location: Embassy Suites by Hilton San Marcos Hotel, Conference Center, & Spa, 1001 E. McCarty Lane, San Marcos, Texas 78666

To register, go to: CECON 2021 (texascecon.org)