INFLUENCE OF RELATIVE DENSITIES FOR SURROUNDING ROCKS ON STRATUM SUBSIDENCE DURING TUNNELLING

Abdul Motalleb QAYTMAS; TIAN Yu; LU Dechun; DU Xiuli

doi:10.13204/j.gyjzG20072217

Volume 51 Issue 7

Nov. 2021

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Abdul Motalleb QAYTMAS, TIAN Yu, LU Dechun, DU Xiuli. INFLUENCE OF RELATIVE DENSITIES FOR SURROUNDING ROCKS ON STRATUM SUBSIDENCE DURING TUNNELLING[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(7): 11-17. doi: 10.13204/j.gyjzG20072217

Citation:

Abdul Motalleb QAYTMAS, TIAN Yu, LU Dechun, DU Xiuli. INFLUENCE OF RELATIVE DENSITIES FOR SURROUNDING ROCKS ON STRATUM SUBSIDENCE DURING TUNNELLING[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(7): 11-17. doi: 10.13204/j.gyjzG20072217

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INFLUENCE OF RELATIVE DENSITIES FOR SURROUNDING ROCKS ON STRATUM SUBSIDENCE DURING TUNNELLING

doi: 10.13204/j.gyjzG20072217

Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China

Received Date: 2020-07-22
Available Online: 2021-11-11

Abstract

Abstract

As a key index to judge the mechanical properties of soil, the relative density is also an important index for the classification of surrounding rock grades. It is of great significance to study the influence on stratum subsidence and stress during tunnelling. Based on the model test platform for shield tunnels developed by Beijing University of Technology, tunnelling tests were conducted in soil with different relative densities, the surface or stratum subsidence and stress during tunnelling were measured systematically. The test results showed that:with the increase of relative densities, the shapes of subsidence troughs for the stratum changed from the distribution shape of Gaussian Function to the triangular shape, the depth and width were smaller and smaller; the subsidence of the surface lagged more behind the process of being tunnelled; the stress paths at the arch crown and arch shoulder became steeper and steeper, that caused the obvious dilation in soils and brought about the above change laws in the shape of the the stratum subsidence troughs. Therefore, in simulations of tunnelling, it was necessary to consider the dilatancy of soil to ensure the rational predications on surface subsidence.
- relative density,
- shield tunnel,
- model test,
- subsidence,
- stress path,
- dilatancy

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References(18)

References

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