Brazos River Levee Toe Protection

The strategy involves positioning more enormous stone boulders at the river bank toe to allow them to fill in eroded areas caused by minor erosion, thereby providing stone toe protection. This setup aims to enhance the conveyance of flood flows through the bend in the Brazos River and the SH 99 bridge structure by reconstructing the bank. The benefits of the improved hydraulics are to mitigate scouring and erosion, prevent accelerated bank loss, and ensure long-term stability. To minimize environmental impacts, the toe of the reconstructed bank would maintain a consistent geometric curve along the bank, with efforts made to align it with the existing bank toe. Raito installed 6 gravity structures by Cement Deep Soil Mixing (CDSM). To facilitate the work, Raito's subcontractor cleared and grubbed 20 acres, built 5,700 1f of all-weather access road, performed preliminary excavations for each structure and managed soil. Each structure was first excavated to 10' BGS to provide a work platform that maximized the production efficiency of Raito's base rig and mixing tools. Elements were strategically installed to create a stable work platform while drilling at the edge of the riverbank.

Project Highlights:

• Multi-axel, large diameter CDSM was used to install structures to 64' deep

• 28-day UCS = 250 psi

• Soil Type = Hi PI clay, sands, silts