Union Pacific Railroad Bridge Foundation Emergency Stabilization - Houston, TX

Project Introduction

Severe flooding in Texas during the summer of 2025 caused significant scour, undermining, and loss of ground at a new Union Pacific Railroad bridge under construction near Houston. Several drilled shafts had already been drilled and cased, but concrete placement had not yet occurred when the flooding affected the site.

The loss and disturbance of soil surrounding the shaft casings created concern that the completed foundations would not provide the lateral resistance required by the original design. The condition required an immediate engineered response because the foundations had to be ready before a scheduled railroad curfew for replacement of the bridge’s main span.

REN worked closely with Union Pacific Railroad and its engineering team to evaluate the affected foundations and develop a targeted compaction-grouting program. The repair was designed to replace lost ground, densify disturbed soils, and reestablish the surrounding ground support required for the drilled shafts to achieve their as-designed lateral capacity.

Key Highlights

• Responded to emergency foundation conditions caused by severe flooding, scour, and ground loss
• Evaluated cased drilled shafts that had been drilled but not yet concreted
• Coordinated closely with Union Pacific Railroad and its engineering team to develop the repair approach
• Designed a targeted compaction-grouting program around the affected drilled shaft casings
• Replaced lost ground and densified disturbed soils surrounding the foundations
• Restored the ground support required for the drilled shafts’ as-designed lateral capacity
• Completed the emergency work before the scheduled main-span bridge-replacement curfew
• Helped preserve the bridge construction schedule while addressing a critical foundation concern

Conclusion

By combining rapid engineering evaluation, specialty compaction grouting, and close coordination with Union Pacific Railroad’s engineering team, REN restored the foundation support lost during the flooding. Completing the work before the scheduled bridge curfew allowed the main-span replacement to proceed while maintaining the original drilled-shaft design intent.

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