Effects of joint orientation and spacing on the boreability of jointed rock mass using tunnel boring machines

Khosravi, Mohsen; Ramezanzadeh, Ahmad; Zare, Shokrollah

doi:10.1007/s12517-020-06428-x

Cited by 3 publications

(1 citation statement)

References 28 publications

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“…In the construction of deep-buried long tunnels, there are often extremely complicated geological conditions such as high ground stress, large deformation of soft rock, and fault zone. Therefore, in the course of TBM construction, the adhesive machine has great risks and brings great challenges to construction [5][6][7][8]. Stress redistribution rock deformation and tunnel instability are closely related to time and construction technology during TBM stress redistribution tunneling.…”

Section: Introductionmentioning

confidence: 99%

Model Test of TBM Tunnel Crossing Large Dip Angle Fault Zone under High In Situ Stress

Wang

Hong

Quan³

et al. 2022

Geofluids

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In order to study the effect of fracture zone on tunnel stability under high ground stress and to reveal the disaster mechanism of fracture zone surrounding rock compressor, the TBM tunnel of Fragrant Furnace Mountain Tunnel in the F12 fracture zone in Dali I section of central Yunnan was experimentally studied. The results show that the TBM cutter head has a significant effect on the surrounding rock pressure in the range of 0.43 D~0.5 D (hole diameter), with a maximum increase of 1.19-fold. As the measurement point approaches the tunnel contour, the displacement of surrounding rock increases. As TBM traverses the fracture zone interface, the displacement of surrounding rock increases at the maximum rate. The effect of TBM shear rock formation failure on the internal displacement of rock formation is 1.21 D in the front and not more than 1.5 D in the top. Sliding and loosening of the fault zone looser above the interface can easily lead to blockage of the fault zone, and the pressure of the surrounding rocks at front edge does not affect more than 1.73 H (the length of horizontal projection of the fault zone interface). Therefore, in the course of construction, the interface of fracture zone should be promoted to reduce the construction risks.

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Section: Introductionmentioning

confidence: 99%

Model Test of TBM Tunnel Crossing Large Dip Angle Fault Zone under High In Situ Stress

Wang

Hong

Quan³

et al. 2022

Geofluids

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show abstract

Prediction of TBM cutterhead speed and penetration rate for high-efficiency excavation of hard rock tunnel using CNN-LSTM model with construction big data

Liu

Zhou

et al. 2022

Arab J Geosci

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Study on Mesoscopic Damage Evolution Characteristics of Single Joint Sandstone Based on Micro‐CT Image and Fractal Theory

Líu

Zheng

Zuo

et al. 2021

Shock and Vibration

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The different directions of joints in rock will lead to great differences in damage evolution characteristics. This study utilizes DIP (digital image processing) technology for characterizing the mesostructure of sandstone and combines DIP technology with RFPA2D. The mesoscale fracture mechanics behavior of 7 groups of jointed sandstones with various dip angles was numerically studied, and its reliability was verified through theoretical analysis. According to digital image storage principle and box dimension theory, the box dimension algorithm of rock mesoscale fracture is written in MATLAB, the calculation method of fractal dimension of mesoscale fracture was proposed, and the corresponding relationship between mesoscale fractal dimension and fracture damage degree was established. Studies have shown that compressive strength as well as elastic modulus of sandstone leads to a U-shaped change when joint dip increases. There are a total of six final failure modes of joint samples with different inclination angles. Failure mode and damage degree can be quantified by D (fractal dimension) and ω (mesoscale fracture damage degree), respectively. The larger the ω, the more serious the damage, and the greater the D, the more complex the failure mode. Accumulative AE energy increases exponentially with the increase of loading step, and the growth process can be divided into gentle period, acceleration period, and surge period. The mesoscale fracture damage calculation based on the fractal dimension can be utilized for quantitatively evaluating the spatial distribution characteristics of mesoscale fracture, which provides a new way to study the law of rock damage evolution.

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Effects of joint orientation and spacing on the boreability of jointed rock mass using tunnel boring machines

Cited by 3 publications

References 28 publications

Model Test of TBM Tunnel Crossing Large Dip Angle Fault Zone under High In Situ Stress

Model Test of TBM Tunnel Crossing Large Dip Angle Fault Zone under High In Situ Stress

Prediction of TBM cutterhead speed and penetration rate for high-efficiency excavation of hard rock tunnel using CNN-LSTM model with construction big data

Study on Mesoscopic Damage Evolution Characteristics of Single Joint Sandstone Based on Micro‐CT Image and Fractal Theory

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