Improving the Hoek–Brown criterion based on the disturbance factor and geological strength index quantification

Feng, Wenkai; Dong, Shan; Wang, Qi; Yi, Xiaoyu; Liu, Zhigang; Bai, Huilin

doi:10.1016/j.ijrmms.2018.06.004

Cited by 23 publications

(10 citation statements)

References 13 publications

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“…Wenki Feng at al. [41] analysed more than 200 sets of BQ and RMR values via regression analysis based on different sites and found the relation as given in Eq. (13).…”

Section: Evaluation Of Different Empirical Design Approaches For Tunnmentioning

confidence: 99%

Effects of different empirical tunnel design approaches on rock mass behaviour during tunnel widening

Khan

Jamil

Jafri

et al. 2019

Heliyon

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Empirical based approaches play an important role in tunnel excavation and support system design. These approaches are considered to be very effective in optimising the process of tunnel excavation and particularly tunnel widening. Several reliable empirical approaches have been developed, however the selection or utilisation of an appropriate empirical method for designing the widening of a tunnel is still a challenging task. Therefore, in this work, the analysis of seven different empirical design approaches was carried out to determine the rock mass behaviour during tunnel widening in high in-situ stress state. These approaches include New Austrian Tunnelling Method, Rock Mass Rating, Rock Mass Quality, Rock Mass Index, Rock Structure Rating, Geological Strength Index and Basic Quality Index. On the basis of simulated statistical results obtained from the said empirical approaches, it was found that the application of Rock Mass Quality approach is highly effective in the tunnel widening since it can satisfactorily incorporate the equivalent dimensions and in-situ stress condition of widened tunnel. The method furnishes optimised reinforcement and support design. Additionally, this study also produces reliable data related to the initial excavation of tunnel which can be helpful in defining precise rock mass parameters during tunnel widening.

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“…Wenki Feng at al. [41] analysed more than 200 sets of BQ and RMR values via regression analysis based on different sites and found the relation as given in Eq. (13).…”

Section: Evaluation Of Different Empirical Design Approaches For Tunnmentioning

confidence: 99%

Effects of different empirical tunnel design approaches on rock mass behaviour during tunnel widening

Khan

Jamil

Jafri

et al. 2019

Heliyon

View full text Add to dashboard Cite

show abstract

“…Consequently, the shear stresses and contact pressure imposed by buildings change due to soil softening and impact building settlement levels (Karimi et al, 2018;Wei et al, 2020). Settlement is an incremental process and is dynamic in the temporal domain; therefore, settlement prediction is important for managing the potential risk of structural damage in buildings (Feng et al, 2018;Dong et al, 2019). Hence, it is necessary to predict foundation settlement in the temporal domain.…”

Section: Introductionmentioning

confidence: 99%

Interval Prediction of Building Foundation Settlement Using Kernel Extreme Learning Machine

et al. 2022

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Dynamic building foundation settlement subsidence threatens urban businesses and residential communities. In the temporal domain, building foundation settlement is often dynamic and requires real-time monitoring. Accurate quantification of the uncertainty of foundation settlement in the near future is essential to advanced risk management for buildings. Traditional models for predicting foundation settlement mostly utilize the point estimates approach, which provides a single value that can be close or distant from the actual one. However, such an estimation fails to quantify estimation uncertainties. The interval prediction, as an alternative, can provide a prediction interval for the ground settlement with high confidence bands. This study, proposes a lower upper bound estimation approach integrated with a kernel extreme learning machine to predict ground settlement levels with prediction intervals in the temporal domain. A revised objective function is proposed to further improve the interval prediction performance. In this study, the proposed method is compared to the artificial neural network and classical extreme learning machine. Building settlement data collected from Fuxing City, Liaoning Province in China was used to validate the proposed approach. The comparative results show that the proposed approach can construct superior prediction intervals for foundation settlement.

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“…Determining the two parameters is crucially significant for selecting rock mass strength parameters. Hence, many scholars have carried out in-depth analysis and research on the values of D and GSI [22,23].…”

Section: Introductionmentioning

confidence: 99%

Freeze-Thaw Effects on Stability of Open Pit Slope in High-Altitude and Cold Regions

et al. 2021

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The cycle of the freeze-thaw action must be taken into account in the stability analysis of an open pit slope in the high-altitude and cold regions, because the natural process of freeze-thaw poses a significant effect on mechanical properties of the rock mass. To achieve this purpose, a linear relationship between the geological strength index (GSI) and the Tianshan slope rock mass rating (TSMR) system is established considering the effect of the freeze-thaw action by introducing a freeze-thaw correction coefficient δ. The GSI value is modified for rock mass in high-altitude and cold regions. The improved Hoek-Brown criterion considers the influences of the freeze-thaw action and steep and gentle slopes. The research outcome is applied in the No. 4 minefield open pit coal mine in the Muli mining area. Numerical calculations are performed by inputting rock mass mechanical parameters obtained in traditional and modified criterions, to discuss the influences of the freeze-thaw action on the stabilities of both the present mining slope and the final slope at the end of the designed mining. The results show that the safety factors of the original slope are 2.33 and 1.67, respectively, while after the modification, they are 2.14 and 1.61, respectively. In terms of the No. 4 minefield open pit coal mine, the slope stability meets the design requirement, although taking the freeze-thaw cycle into account.

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Improving the Hoek–Brown criterion based on the disturbance factor and geological strength index quantification

Cited by 23 publications

References 13 publications

Effects of different empirical tunnel design approaches on rock mass behaviour during tunnel widening

Effects of different empirical tunnel design approaches on rock mass behaviour during tunnel widening

Interval Prediction of Building Foundation Settlement Using Kernel Extreme Learning Machine

Freeze-Thaw Effects on Stability of Open Pit Slope in High-Altitude and Cold Regions

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