Model Test Study on Influences of Deep Foundation Pit on Adjacent Tunnel in Soil-Rock Mixtures

doi:10.3973/j.issn.2096-4498.2019.S2.025

Tunnel Construction ›› 2019, Vol. 39 ›› Issue (S2): 192-199.DOI: 10.3973/j.issn.2096-4498.2019.S2.025

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Model Test Study on Influences of Deep Foundation Pit on Adjacent Tunnel in Soil-Rock Mixtures

YANG Bo^{1, 2}, TAN Yong^{1, 2, ∗}

(1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China)

Received:2019-07-01 Online:2019-12-31 Published:2020-04-04

Abstract

Abstract:

The dissimilar test method is carried out for tunnel response induced by foundation pit excavation in soil-rock mixtures. The discontinuous characteristics of the mixtures complicate the influence of foundation pit excavation on adjacent tunnel. Meanwhile, the influence of rock content w on the tunnel response induced by foundation pit excavation is studied. The experimental results show that: (1) An increase in w would decrease the tunnel segment moment. (2) Variations of earth pressures around tunnel lining show different laws in the cases of w<60%,w =60% and w = 90%. (3) When 0%< w ≤ 60%, the increase of rock content cannot reduce the variation on deformation and displacement of tunnel segment; however, the variation on deformation and displacement of tunnel segment can be effective controlled in the case of w = 90%.

Key words: tunnel, foundation pit, soil-rock mixtures, rock content, model test

CLC Number:

U 45

YANG Bo, TAN Yong. Model Test Study on Influences of Deep Foundation Pit on Adjacent Tunnel in Soil-Rock Mixtures[J]. Tunnel Construction, 2019, 39(S2): 192-199.

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Model Test Study on Influences of Deep Foundation Pit on Adjacent Tunnel in Soil-Rock Mixtures

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