Model test study on large deformation mechanism of thin-bedded metamorphic sandstone tunnel

Zhang, Bo; Sun, Xiaoming; Yang, Kang; Guo, Pengfei; Tao, Zhigang

doi:10.1007/s10064-022-02937-z

Cited by 11 publications

(1 citation statement)

References 27 publications

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“…Numerous researchers have studied tunnels' deformation and mechanical properties in layered surrounding rock with high ground stress, mainly using model tests [10][11][12][13][14][15][16] and numerical simulations [17][18][19][20][21]. These methods are effective for investigating tunnels in layered surrounding rock because they have high repeatability, are low cost, and are less time-consuming [22].…”

Section: Introductionmentioning

confidence: 99%

A Field Study to Measure the Surrounding Stress of Rock and Supporting Structure of a Steep Tunnel with a Combination of Hard and Soft Rock Layers under Plate Compression

Zhang,

Hu,

et al. 2024

Buildings

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Tunnels excavated in a combination of hard and soft rock strata with high ground stress are prone to large deformations, collapse, and other disasters. The Yongfeng Tunnel, a reconstruction and expansion of the G544 line, suffered severe high ground stress from plate compression. This paper studied the surrounding rock pressure and supporting structure stress characteristics of tunnels with a combination of hard and soft rock strata with high ground stress by using earth pressure cells, surface strain gauges, and embedded strain gauges to test all stress related to the surrounding rock, primary support, and secondary lining. It was found that the contact pressure (P1) between the initial support and the surrounding rock and the contact pressure (P2) between the initial support of the leading tunnel were distributed in the direction of vertical stratification, while the contact pressures (P1 and P2) of the lagging tunnel were different due to the excavation unloading of the leading tunnel. The maximum stress positions of the initial support of the leading tunnel and the lagging tunnel were located in the left arch waist and the vault, respectively. However, the maximum stress position of the secondary lining was generally located on the side wall. The research results presented herein can guide future tunnel construction projects.

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