Physical Modeling of Displacement and Failure Monitoring of Underground Roadway in Horizontal Strata

Hou, Dinggui; Yang, Xiao‐Jun

doi:10.1155/2018/2934302

Cited by 11 publications

(3 citation statements)

References 15 publications

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“…e rock bolt reinforcement system is basically composed of four components: the surrounding confining medium, e.g., rocks or soils, the rock reinforcement element, the internal fixture, and the external fixture [7][8][9]. It is found that all these four components have an influence on the performance of a reinforcement system.…”

Section: Introductionmentioning

confidence: 99%

The Analytical Approach to Evaluate the Load‐Displacement Relationship of Rock Bolts

Chen

Yang

Zhao

et al. 2019

Advances in Civil Engineering

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Fully grouted rock bolts are widely used in civil engineering and mining engineering, playing a significant role in keeping the stability and safety of excavations. In this paper, the load transfer mechanism of fully grouted rock bolts was studied with an analytical model. A trilinear model was used to depict the bond-slip behaviour of the bolt/grout interface. The displacement of the confining medium was involved in this analytical model. Then, the shear stress propagation along the bolt/grout interface was analysed in the elastic, elastic-softening, elastic-softening-debonding, softening-debonding, and debonding stages. Experimental pull-out tests were used to validate this analytical model. There was a good correlation between experimental and analytical results. A parametric study was conducted to evaluate the influence of Young’s modulus of the confining medium, the shear strength of the bolt/grout interface, and the residual shear strength of the bolt/grout interface on the load transfer performance of rock bolts. The results show that increasing Young’s modulus of the confining medium was beneficial for improving the load transfer performance of rock bolts. However, once Young’s modulus of the confining medium was beyond a critical limit, it had marginal effect on the peak load of rock bolts. Furthermore, increasing the shear strength of the bolt/grout interface and the residual shear strength of the bolt/grout interface led to rising of the peak load of rock bolts. However, compared with the residual shear strength of the bolt/grout interface, increasing the shear strength of the bolt/grout interface had more apparent effect in improving the peak load of rock bolts.

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Section: Introductionmentioning

confidence: 99%

The Analytical Approach to Evaluate the Load‐Displacement Relationship of Rock Bolts

Chen

Yang

Zhao

et al. 2019

Advances in Civil Engineering

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“…Sharan [21] used the Hoek-Brown criterion to analyse the stress and displacement distribution of surrounding rock in a circular roadway. Hou and Yang [22] developed a physical model of the roadway to obtain the real-time surface displacement with DIC (Digital Image Correlation). Zhu et al [23] provided the elastoplastic analysis of roadway using the statistical damage constitutive model and derived the stress distribution of roadway.…”

Section: Introductionmentioning

confidence: 99%

Large Deformation Mechanics of Gob‐Side Roadway and Its Controlling Methods in Deep Coal Mining: A Case Study

Zheng

Wen-jun

Sun

et al. 2020

Advances in Civil Engineering

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Maintaining surrounding rock mass stability of roadways is essential to the safety of deep coal mining. In this study, the No. 2-2092 roadway of the No. 2-209 mining face in Ganhe coal was taken as the target roadway for field analysis. The selected region can be considered a typical area with dominating geological tectonic stress, based on the geological survey and in situ stress results. A mechanical model of roadway overburdens was developed to analyse the large deformation and stress field distribution. It is found that the large deformation is caused by the combined superposed stress field including laterally transferred stress formed in structures at overlying strata, mining-induced advanced abutment pressure, and the regional in situ stress. Thus, a Two-Direction Hydrofracturing Technique (TDHT) was proposed to reduce the pressure of the No. 2-2092 roadway by altering the roof structure in the influenced zones. Compared with the original roadway without fracturing, it is found that the roof to floor convergence has dropped by nearly 47% after fracturing; the displacement of sidewalls has reduced by almost 31%, demonstrating the effectiveness of the proposed method in pressure relief. Results from this study can provide guidance on controlling the large deformation of roadways in deep underground mines.

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“…Huang et al [18] adopted the non-contact digital image correlation technology (DIC) to measure the field displacement of a tunnel crossing a fault plane. Hou and Yang [19] conducted real-time monitoring of surface displacement for an underground roadway in a horizontal rock layer using the DIC technology in the experiment. However, all these methods cannot provide insights into the internal damage process, which can better serve for early warning before the occurrence of water seepage.…”

Section: Introductionmentioning

confidence: 99%

Time Series Analysis of Acoustic Emissions in Prefabricated Utility Tunnel During the Sealing Test

Lin

Deng

et al. 2020

Int. J. of Geosynth. and Ground Eng.

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Utility tunnel is increasingly applied for underground space development, and its health monitoring becomes attractively important. The acoustic emission (AE) technology is often used for damage monitoring of small-scale specimens made of concrete or rock in the laboratory. In this study, the AE technology is adopted to instrument a novel prefabricated utility tunnel to provide insights into the leakage behavior of the structure during the sealing test. Filtering is conducted on AE data to eliminate the influence of noise interference, especially for data in the pressurization stage. The traditional ring-down count and AE energy are determined from eigenvalue analysis of AE events. It is found that these conventional calculations can be well related to the pattern of internal water pressure, and the Felicity effect is found in the loading process. Furthermore, time series analysis is carried out for each specific pressurization or pressure-holding stage during the sealing test, in which the b-value (an important mean to study the characteristics of AE signal) is evaluated. Results show that the b-value can also be used as a prediction basis for pre-alarming monitoring before the occurrence of seepage failure for utility tunnel.

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Physical Modeling of Displacement and Failure Monitoring of Underground Roadway in Horizontal Strata

Cited by 11 publications

References 15 publications

The Analytical Approach to Evaluate the Load‐Displacement Relationship of Rock Bolts

The Analytical Approach to Evaluate the Load‐Displacement Relationship of Rock Bolts

Large Deformation Mechanics of Gob‐Side Roadway and Its Controlling Methods in Deep Coal Mining: A Case Study

Time Series Analysis of Acoustic Emissions in Prefabricated Utility Tunnel During the Sealing Test

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