Continuum analysis of the structurally controlled displacements for large-scale underground caverns in bedded rock masses

Li, Ang; Liu, Yi; Dai, Feng; Liu, Ke; Wei, Mingdong

doi:10.1016/j.tust.2020.103288

Cited by 100 publications

(25 citation statements)

References 47 publications

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“…e most prominent feature is that, during the large deformation 1# -30 37 20 8 -5 10 -2# -27 40 21 7 -5 10 -3# -23 39 22 11 -5 10 -4# -24 38 22 11 -5 10 -Note: M: montmorillonite; I/M: Imon mixed layer; I: illite; K: kaolinite; C: green mixed stone; C/S: green mixed layer; Py: pyrophyllite. 8 Advances in Civil Engineering of the surrounding rock, the pressure displacement caused by the loading and output of the anchor rod is the relative sliding of the casing and the rod body, rather than the deformation of the material of the rod body, so that it has extraordinary deformation capacity. e NPR cable can absorb the deformation property of rock mass and release the energy in rock mass when large deformation occurs [5].…”

Section: Coupling Supporting Principle Of Large Deformation With Consmentioning

confidence: 99%

“…Tunnels and underground projects are often in a complex and special environment, in which soft rock has mechanical media with significant and complex deformation. Large deformation of weak surrounding rock leads to geological disasters, which brings about a series of special problems to the design and construction of tunnels and other related underground projects [7][8][9][10][11][12]. He et al divide the large deformation into the elastic large deformation and the plastic large deformation and divide the soft rock into the stress dilatancy type, the physical and chemical expansion type, and the structural deformation type, and they divide them into four grades according to the severity [13,14].…”

Section: Introductionmentioning

confidence: 99%

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Study on Deformation Mechanism and Support Measures of Soft Surrounding Rock in Muzhailing Deep Tunnel

Tao

Cao

Liu

et al. 2020

Advances in Civil Engineering

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The deformation of Muzhailing deep tunnel is about 2.3 m in the process of construction, which is difficult to be controlled by the traditional “anchor-grouting integration” support system. This paper deeply analyzes the geological characteristics, rock mechanics characteristics, and surrounding rock failure characteristics of Muzhailing tunnel. The deformation mechanism and the failure of the support system are analyzed through the numerical simulation, theoretical analysis, and field test. The authors propose support measures suitable for Muzhailing tunnel based on the analysis results. The maximum buried depth is 600 m, and the engineering rock mass at the depth has nonlinear physical and mechanical phenomenon. The maximum principal stress of Muzhailing tunnel is 25.7 MPa, which belongs to high-stress joint swelling soft rock tunnel. The NPR cable can achieve large deformation under the condition of constant support resistance. The authors put forward the coupling support mode of “NPR cable + steel arch frame + concrete,” which is based on the idea of transforming the composite deformation mechanism to a single type. The stress concentration appears in the range of 12 m in the surrounding rock circle, and the lateral and vertical stress distributions are relatively symmetrical after the improved support. The circumferential strain of the surrounding rock is greatly reduced, and the range of strain is reduced by 10%. The field monitoring results show that the new support system can well control the large soft rock deformation of Muzhailing tunnel (0.5 m). The support strategy proposed can effectively control the large deformation and promote the formation of new support concept for deep tunnel.

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Section: Coupling Supporting Principle Of Large Deformation With Consmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on Deformation Mechanism and Support Measures of Soft Surrounding Rock in Muzhailing Deep Tunnel

Tao

Cao

Liu

et al. 2020

Advances in Civil Engineering

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“…Microseismic (MS) monitoring technology, as an advanced dynamic disaster monitoring method, has been widely used in deep-buried tunnels [1], coal mines [2], underground chambers [3], rock slopes [4] and other engineering fields. Sensors are used to receive vibration signals induced by mass rock rupture.…”

Section: Introductionmentioning

confidence: 99%

Microseismic Signal Denoising via Empirical Mode Decomposition, Compressed Sensing, and Soft-thresholding

Dong

et al. 2020

Applied Sciences

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Microseismic signal denoising is of great significance for P wave, S wave first arrival picking, source localization, and focal mechanism inversion. Therefore, an Empirical Mode Decomposition (EMD), Compressed Sensing (CS), and Soft-thresholding (ST) combined EMD_CS_ST denoising method is proposed. First, through EMD decomposition of the noise signal, a series of Intrinsic Mode Functions (IMF) from high frequency to low frequency are obtained. By calculating the correlation coefficient between each IMF and the original signal, the boundary component between the signal and the noise was identified, and the boundary component and its previous components were sparsely processed in the discrete wavelet transform domain to obtain the original sparse coefficient θ. Second, θ is filtered by ST to get the reconstruction coefficient θnew after denoising. Then, CS was used to recover and reconstruct θnew to get the denoised IMFnew component and then recombined with the remaining IMF components to get the signal after denoising. In the simulation experiment, the denoising process of EMD_CS_ST method is introduced in detail, and the denoising ability of EMD_CS_ST, DWT, EEMD, and VMD_DWT under 10 different noise levels is discussed. The signal-to-noise ratio, signal standard deviation, correlation coefficient, waveform diagram, and spectrogram before and after denoising are compared and analyzed. Moreover, the signals obtained from the underground cavern of the Shuangjiangkou hydropower station were denoised by the EMD_CS_ST method, and the signals before and after denoising were analyzed by time-frequency spectrum. These results show that the proposed method has better denoising ability.

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“…However, when the depth of an excavation increases, geological disasters, such as large deformations mostly caused by landslides, cannot be avoided by employing traditional small-deformation support systems. is is due to complex factors, such as the high ground stress, rainfalls, and the weather condition, reducing the physical and mechanical properties of rock, which can easily cause slope instabilities and other secondary disasters [4][5][6][7][8][9]. In recent years, support materials with the characteristics of anchor bolt cables have been developed by several research groups in various countries.…”

Section: Introductionmentioning

confidence: 99%

The Study of the Supernormal Mechanical Properties of Giant NPR Anchor Cables

Tao

Zhu

et al. 2020

Shock and Vibration

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Due to the frequent occurrence of geological disasters, such as geological faults, tectonic activities, and local activities, the study of a cable structure capable of resisting large deformations and of absorbing energy is investigated. e plane length is increased step by step based on the deformation and energy absorption values of the original NPR anchor cable model. ree kinds of two-stage constant resistance bodies are designed following the three principles: first-stage friction plus second-stage expansion, primary expansion plus secondary expansion, and first-stage expansion plus second-stage friction. Moreover, a giant NPR anchor cable with extraordinary mechanical properties is developed. Via a theoretical analysis and laboratory static tensile tests on traditional NPR and giant NPR anchor cables, their force characteristics, constant resistance, and fluctuation trends are related to the size and the structure of the constant resistance body. In addition, the most remarkable improvement takes place in the cables' deformation and energy absorption properties. e deformation increases from 1000-2000 mm to 3000-4000 mm, while the energy absorption value increases from 4.21 × 10 5 -1.09 × 10 6 J to 3.2 × 10 6 J. e constant resistance value is also effectively enhanced to 550-723.7 kN. is provides a reliable technical support for their application in deep geological faults.

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Continuum analysis of the structurally controlled displacements for large-scale underground caverns in bedded rock masses

Cited by 100 publications

References 47 publications

Study on Deformation Mechanism and Support Measures of Soft Surrounding Rock in Muzhailing Deep Tunnel

Study on Deformation Mechanism and Support Measures of Soft Surrounding Rock in Muzhailing Deep Tunnel

Microseismic Signal Denoising via Empirical Mode Decomposition, Compressed Sensing, and Soft-thresholding

The Study of the Supernormal Mechanical Properties of Giant NPR Anchor Cables

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