Article Dans Une Revue Rock Mechanics and Rock Engineering Année : 2025

Improved Squeezing Prediction of Deep Tunnels Within Highly Fractured Rock Mass: Update of the Hoek & Marinos Curve Under Uncertainties

B. Fenneteau
O. Deck
R. Mehdizadeh
  • Fonction : Auteur
F. Laigle
  • Fonction : Auteur

Résumé

In the early stages of deep tunnel design, identifying potential hazards, such as significant deformations around the tunnel after excavation, is crucial. The abacus introduced by Hoek & Marinos (2000) remains a widely used tool for estimating such deformations. This article aims to clarify the assumptions of the original abacus and updates it using numerical modeling, supplemented by a Monte Carlo simulation on input parameters to address a broader range of geological scenarios. Unlike the original approach based on analytical expressions, the new curves incorporate a generalized Hoek and Brown failure criterion, revised parameter intervals, and enhanced practical applicability. To address uncertainties in input parameters at early design stages, a “3-point method” was developed. This method propagates uncertainties through the updated curves, enabling the estimation of the median radial strain, a confidence interval—reasonably associated with a 95% range under certain assumptions—and the parameters of the probability density function. The method and updated curves were validated through a case study of the Yacambu–Quibor tunnel, demonstrating their effectiveness in estimating squeezing potential and uncertainty impacts. The updated curves offer three key advantages: (1) they eliminate the need to estimate the uncertain rock mass strength; (2) they account for variability in the elastic modulus using three modulus ratios (200, 400, 600); and (3) they rely exclusively on input parameters from laboratory tests and field investigations (σci, mi, σ0), with GSI iso-values introduced. These improvements provide a more reliable tool for assessing tunnel deformation risks while maintaining the qualitative recommendations of the original abacus.

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Dates et versions

hal-05185297 , version 1 (24-07-2025)

Identifiants

Citer

B. Fenneteau, O. Deck, R. Mehdizadeh, F. Laigle. Improved Squeezing Prediction of Deep Tunnels Within Highly Fractured Rock Mass: Update of the Hoek & Marinos Curve Under Uncertainties. Rock Mechanics and Rock Engineering, 2025, 58, pp.8557-8574. ⟨10.1007/s00603-025-04574-w⟩. ⟨hal-05185297⟩
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