Abstract
The difference of earth pressure between the two sides of the excavation is caused by the unloading of the river. It is difficult to balance the asymmetrical pressure if adopting the traditional symmetrical excavation, which would cause the inclination of excavation. Excavation of subway station adjacent to river and main road was studied based on numerical simulation of stage excavation under drained condition. Compared with the traditional half-width symmetrical design, the numerical method can better reflect the characteristics of the excavation and the transmission of eccentric rotation effect in the whole retaining structure. Parameter analysis is carried out to study the asymmetrical pressure of the excavation caused by the distance between excavation and river bank (Lr), distance between external load and excavation (Lt). Various reinforcement measures on the excavation characteristics are analyzed and the lateral displacement and surface settlement under 16 working conditions are calculated. The results show that if there is a river channel and external load within the range of the excavation depth (He), the asymmetrical pressure on excavation is significant and cannot be ignored. The influence of asymmetrical pressure can be reduced and the stability of adjacent river side stratum can be better protected by increase the stiffness of diaphragm wall. With the increment of the thickness of one side diaphragm wall, the higher resistance for this side is provided and the influence of asymmetrical pressure is reduced.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant No. 51978430), Natural Science Foundation of Inner Mongolia Autonomous Region (Grant No. 2020BS05017) and Fundamental Research Funds for the Central University (No. DUT20GJ204).
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Responsible Editor: Zeynal Abiddin Erguler
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Zhang, W., Wu, N., Jia, P. et al. Study of the mechanical performance of excavation under asymmetrical pressure and reinforcement measures. Arab J Geosci 14, 1834 (2021). https://doi.org/10.1007/s12517-021-07846-1
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DOI: https://doi.org/10.1007/s12517-021-07846-1