Composite Foundation In Collapsible Loess Bridge Foundation

The collapsible loess is often met during the construction of the high-grade highway in the loess area, and the main failure is the uneven subsidence of the roadbed and the culvert, which affects the safe usage of the roadbed and the culvert, etc. Directed against this, based on the Chankou-Lanzhou freeway construction, the paper analyzes the application of the composite ground formed by lime-soil pile under the bridge and designs the project, discusses the rules of the contact pressure, the stress ratio of the pile and the soil, compares the P-S curves of one pile, the composite ground formed by one pile and the composite ground formed by two piles based on the in-situ plate loading test, evaluates the bearing capacity of the composite ground of the project. The in-situ test result shows that using the lime-soil pile to treat the collapsible loess under the bridge is feasible.