Investigating the effect of soil improvement by micropile method in marl soil: a case study of Bidboland, Khuzestan

Document Type : Research Article

Authors

1 Department of Civil Engineering, Shahrekord University, Shahrekord, Iran

2 M.Sc. in Geotechnical Engineering, Bu Ali Sina University, Hamedan

3 Islamic Azad University of Abadan

Abstract

Based on a case study, the soil improvement operation under single foundations of a settled concrete structure has been presented using injected micropiles. Based on this, the effect of using micropiles in controlling the stress-deformation field created in the soil of the concrete structure has been studied. In order to evaluate the situation of the settlements, the necessary information was collected, including subsurface identification using geotechnical boreholes and settlement monitoring operations. The survey results before the soil improvement operations indicated the settlement of individual foundations and the continuity of the settlements. After the soil improvement operation, this trend reached zero. Using the Abaqus finite element software, a set of numerical analyses was performed on a concrete structure built on a loose foundation prone to destructive deformations in structural load-bearing members such as columns. In these simulations, in order to obtain the optimal performance of micropiles, the parameters of depth, diameter, and several micropiles were examined. The necessity of this research includes the decision to improve the soil of a settled concrete structure in the vicinity of the excavation based on the micropiles method or the destruction of the structure. The obtained results showed that the parameters of the length and number of micropiles have the greatest effect on the control of the deformation field and settlement of the structure. Also, the results show that the effect of the structure weight parameter on the interaction between the micropiles and the structure is significant.

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References

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Amirkabir Journal of Civil Engineering
Volume 54, Issue 12
March 2023
Pages 4573-4588

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