Study on the mechanical properties of large diameter and long distance reinforced concrete pipe jacking in weak strata
DOI:
https://doi.org/10.14311/Keywords:
Weak strata, Large diameter reinforced concrete pipe jacking, Mechanical properties, Field testingAbstract
In order to study the mechanical properties of large diameter and long distance reinforced concrete pipe during jacking in weak strata, field monitoring of jacking force, contact pressure, slurry pressure and pipe strain was carried out on based on the Tangxun Lake sewage pipe jacking project in Wuhan. The results showed that during the jacking process, the axial stress of the pipe was mainly compressive stress, and there are some areas of stress concentration. As the jacking distance increases, the axial stress of the pipe first increases and then remains relatively stable. The hoop strain of pipe is mainly compressive strain, which is mainly affected by earth pressure and axis deviation. Under the slurry pressure, the hoop strain at the top and bottom of the pipe increases, while the left and right sides decrease. The bottom of the pipe is in contact with the soil, and the contact pressure is the largest, while the left and right sides are in full or partial contact with the slurry. The crown of the pipe is in contact with the slurry and the contact pressure is affected by the mud pressure. In addition, the contact pressure is not directly related to the jacking distance.
Received: 18.12.2023
Received in revised form: 23.9.2024
Accepted: 13.8.2025
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