Effect of Pipes Used as Advance Support Measure on the Development of a Load-Bearing Ring of Soil
Effect of Pipes Used as Advance Support Measure on the Development of a Load-Bearing Ring of Soil
Pipes have long been used to support the crown in soft ground and avoid local degradation of soil strength and stiffness. The main role of the pipes is rather to preserve the geometric shape of the excavation rather than to carry loads themselves. In this way a load-bearing ring of soil around the tunnel can develop. The load-bearing effect is achieved by the development of arching effects in the soil between the individual pipes in the transverse and longitudinal directions. In order to evaluate this mechanism, model tests in a sandbox at a scale of 1:20 of a section of the system were carried out. The effects of grain size, density, and stress level were investigated. The displacements and arching effect
between the pipes were visualized by particle image velocimetry. The main aim of this study is to analyse the arching effect by means of model tests and numerical calculations. The numerical calculations are conducted with different material models (Mohr-Coulomb, Hardening Soil, Hypoplasticity) and the results are compared.
I. Bathaeian; B. Schneider-Muntau
10th European Conference on Numerical Methods in Geotechnical Engineering (NUMGE2023)
10. Tunnelling and mining applications
https://doi.org/10.53243/NUMGE2023-91
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