Experimental investigation of the compression-bending property of the casing joints in a concrete filled steel tubular supporting arch for tunnel engineering

Li, Weiteng; Yang, Ning; Mei, Yuchun; Zhang, Yuhua; Wang, Lai; Ma, Haiyao

doi:10.1016/j.tust.2019.103184

Cited by 45 publications

(12 citation statements)

References 20 publications

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“…When the shield machine tunneled to K31 + 342.355, the phenomenon of high water pressure and large-flow water inrush appeared at the tunnel face, and it was found that the water inrush increased. This could result in a series of problems, such as poor slag soil properties and transportation difficulty, seriously reducing the tunneling efficiency [29]. The inrush of water from the excavation face is shown in Figure 11c, showing an obvious large flow rate that is pressure bearing.…”

Section: Overview Of the Projectmentioning

confidence: 99%

Reconstruction and Measurement of Irregular Karst Caves Using BLST along the Shield Metro Line

Sun

Wang

et al. 2020

Applied Sciences

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This study investigated the application of the borehole laser scanning technology (BLST) method in the detection of both dry and water-filled karst caves. In order to solve the problem of excessive laser attenuation during the detection, we designed a test for the characteristics of multiwavelength laser attenuation in water-filled karst caves and studied the influence exerted by various factors, including different wavelengths, different laser power levels, different suspended media, and effect of turbidity on the attenuation coefficient. During the test, we discovered the existence of a “blue-green window” with low turbidity and a “near infrared window” with high turbidity in karst cave water environments. Based on the general survey results of drilling and comprehensive geophysical prospecting, a quantitative method using targeted drilling was proposed to detect the spatial morphology of karst caves in complex environments. We also investigated the effects of complex environmental factors such as suspended media and high turbidity on the laser detection distance and accuracy in karst caves, and established a quantitative matching model of laser wavelengths, laser power, and complex environmental parameters. Based on this, we obtained the best acquisition mode for detecting lasers in different karst development environments. A high-precision, three-dimensional visualized model of a real karst cave was established to quantitatively obtain the characteristic parameters, such as accurate position, three-dimensional shape, space volume, and cave filling type, which was applied to the detection of karst caves along the Jinan subway line.

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Section: Overview Of the Projectmentioning

confidence: 99%

Reconstruction and Measurement of Irregular Karst Caves Using BLST along the Shield Metro Line

Sun

Wang

et al. 2020

Applied Sciences

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“…Gob-side entry roadways can be affected by mining at the last working face because of the large burial depth and ineffective support. During roadway excavation, there is obvious deformation of the surrounding rock, bolt breakage, bending deformation, and failure of steel strips [20], amongst other support issues. e main coal seam #4 has a strong tendency to burst, and the overlying strata undergo fracturing.…”

Section: Engineering Backgroundmentioning

confidence: 99%

Deformation Caused by Dynamic Load and Support Requirements in a Deep Gob-Side Entry Rock Mass

Zhang

Yang

Zhuge

2019

Advances in Materials Science and Engineering

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Gob-side entries in deep coal mines can be subjected to dynamic loading when driving along the goaf. The effects of this dynamic loading and improved ground support requirements are investigated in the Gaojiabao Coal Mine, China. Numerical modeling is first used to simulate the deformation characteristics of rock surrounding the gob-side entry under dynamic load with the original support design. Dynamic loading in this scenario causes continual deterioration in rock properties, and deformation accumulates as the number of dynamic loads increases. Therefore, the overall strength and rigidity of the bolt support design need improvement, especially in terms of using yielding bolts that assist in releasing unnecessary support loads. The deformation characteristics of the rock surrounding the gob-side entry are combined with the concept of coupled pressure support to provide an optimized bolt support design. The support effects of the optimized design are then also numerically simulated and compared with the original support design. Deformation in the optimized design is significantly reduced, and roadway control is improved. Finally, the optimized design is applied and measured in a gob-side entry excavation. The field test results show that the potential for loosening, deformation, and failure of the surrounding rock is effectively controlled.

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“…Coal as a complex porous medium exhibits a range of mechanical characteristics under different conditions that have an important impact on mine safety. The damage and evolution process of rocks under external loads is accompanied by signals of sound, light, electricity, heat, and magnetism, which are particularly important indicators of disaster prediction and early warning in the fields of geotechnical and mining engineering fi (Moradian et al, 2016;Rabiei et al, 2013;Chen et al, 2016;Li et al, 2020). These features play a significant role in the prediction and early warning of various kinds of engineering disasters associated with tunnel engineering, water conservancy, and hydropower engineering.…”

Section: Introductionmentioning

confidence: 99%

Acoustic emission characteristics of coal under different triaxial unloading conditions

Yang¹

2020

Acta Geodynamica Et Geomaterialia

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The mechanism of coal and rock damage caused by unloading during deep mining differs from that caused by continuous loading, and failure often results from a combination of loading and unloading. Triaxial unloading tests are useful for studying the damage characteristics of coal and rock under different conditions from a unloading point of view to better understand dynamic disasters of deep coal and rock. In this study, we performed triaxial tests involving loading axial stress and unloading confining pressure (4, 7, 10 MPa) using different unloading rates (0.02, 0.05, 0.08, 0.11, 0.14 MPa/s), and acoustic emission (AE) events were recorded simultaneously. The results show that the maximum AE ring and energy counting rates do not appear at peak stress but rather at the stress drop stage following peak stress. Similarly, the maximum AE impact counting rate occurs after the peak stress, which indicates that the internal cracking of the coal samples reaches a maximum at the fracture stage following peak stress. The AE information indicates a relatively quiet period prior to the occurrence of large-scale AE events. Higher initial unloading confining pressure is associated with earlier and more severe failure after peak stress. Faster unloading rates are also associated with earlier sample destruction after peak stress because the coal rapidly changes from a triaxial stress state to a uniaxial stress state with higher unloading rate, crack propagation is insufficient, and more elastic energy is released. Compared with conventional triaxial tests, the coal damage variable increases faster under triaxial unloading tests, which indicates that unloading failure is more severe.

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Experimental investigation of the compression-bending property of the casing joints in a concrete filled steel tubular supporting arch for tunnel engineering

Cited by 45 publications

References 20 publications

Reconstruction and Measurement of Irregular Karst Caves Using BLST along the Shield Metro Line

Reconstruction and Measurement of Irregular Karst Caves Using BLST along the Shield Metro Line

Deformation Caused by Dynamic Load and Support Requirements in a Deep Gob-Side Entry Rock Mass

Acoustic emission characteristics of coal under different triaxial unloading conditions

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