Industrial

Idarado Mine

Location: Ouray, CO

Overview: CTL | Thompson was contracted to perform compression load tests on two different helical pile types for the foundation of a new maintenance building at the Idarado Mine located just outside of Ouray, Colorado. Poor subsurface conditions included approximately 5-feet of mine cuttings underlain by 10’ of soft silty sand followed with a nearly impenetrable layer of bedrock. The main concern of the client was the ability of the helical piles to withstand the compression force without buckling within the soft layer.

 

We decided the best approach to evaluate the piles was to use the Maintained Compression Test (Procedure B of ASTM D1143 – Standard Load Test Procedure for Deep Foundations). After setting up the frame over the test piles we began the roughly 36-hour load test. During the first compression test, we found the soil stratum below had relatively low-tension capacity and reaction piles began to pull out of the ground. CTL's representative recommended that any equipment the mining operation had available be put on the frame to help resist the uplift loading. Overall, the tests were taken to 167% of the design load to evaluate the buckling capacity. CTL | Thompson’s effort and ability to solve problems helped to keep production piles on schedule.

Services Provided: IAS Department Field Testing

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