Test Study on Ultimate Soil Bearing Capacity of Buried Pipeline-Sand Lateral Interaction

Abstract eng:
In order to predict the response and safety of the buried pipeline, equivalent soil spring was employed by many scholars. The key to obtain equivalent soil spring coefficient is to calculate ultimate soil bearing capacity of soil-pipe interaction. Many standards adopt bearing capacity coefficient to characterize the ultimate bearing capacity of the soil, which is depended on the internal friction angle of soil (φ) and the embedment depth/diameter ratios (H/D), but the embedment depth/diameter ratios in these standards are relatively small (about 10.0 or less), thus, the results from these standards will not be reasonable when the embedment depth/diameter ratios is larger than 10.0. So, there are some deficiency in these standards because the embedded depth of buried pipeline has been great larger than ever. In the view of the deficiency of acquiring bearing capacity coefficient, following the works of Trautmann and O’Rourke(1985), some studies have been done with ABAQUS software package to simulate the pipe-sand interaction by the authors, and a formula for calculating the soil bearing capacity coefficient was proposed, considering the effect of internal friction angle(φ), the embedment depth/diameter ratios (H/D) and diameter (D). In order to verify the reasonability of our previous simulation works, a series of model tests had been carried out. In this paper, these test works are presented and the influence factors are studied. Finally, some discipline are discovered, such as (1) The failure mode in deep embedded is different to that in shallow embedded; (2) The values in different test are different because of the difference in test conditions; (3) N h will increase and then decrease with the increasing in H/D, the proposed formula in our previous work cannot simulate the test result very well when H/D is larger than 15.0, thus, a further research to study the ultimate soil bearing capacity of buried pipeline-sand interaction is needed.

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