Improved Nonlinear Nishihara Shear Creep Model with Variable Parameters for Rock-Like Materials

Lin, Hang; Zhang, Xing; Wang, Yixian; Rui, Yong; Fan, Xiang; Du, Shigui; Zhao, Yanlin

doi:10.1155/2020/7302141

Cited by 34 publications

(24 citation statements)

References 58 publications

(63 reference statements)

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“…erefore, the free section of the prestressed anchor cable is a weak link that is susceptible to shear failure. Lin et al studied the anchorage stress and deformation of the anchorage joint under shear action through direct shear test and found that the inclination angle of the bolt has an effect on the shear strength of the joint plane and improved the shear creep model of rock-like materials [14,15].…”

Section: Introductionmentioning

confidence: 99%

Study on Double-Shear Test of Anchor Cable and C-Shaped Tube

Shan

Bao

Huang

et al. 2021

Shock and Vibration

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The free section of prestressed anchor cable is a weak part of support. A new supporting structure named Anchor Cable and C-Shaped Tube, which can bear transverse shear force, solves the problem that rock bolt and anchor cable are prone to shear failure in the free section and also solves the contradiction between high preload and low shear bearing capacity of support materials. Double-shear tests of Anchor Cable and C-Shaped Tube with smooth joint planes were carried out. Double-shear tests were carried out on the anchor cables with the diameter of 21.6 mm and the same type of Anchor Cable and C-Shaped Tube under different preload conditions. The influence of the preload on the shear performance of supporting materials and the enhancement effect of Anchor Cable and C-Shaped Tube supporting structure on the shear performance of anchor cables were analyzed. The test results confirm that Anchor Cable and C-Shaped Tube can improve the transverse shear resistance of the supporting material and increase the axial ultimate bearing capacity of the anchor cable during the shearing process. It is found that, during the double-shear test, the fracture form of the supporting materials is tensile fracture, and when it is sheared, Anchor Cable and C-Shaped Tube can reduce the stress concentration of the interaction between the joint surface and the surrounding rock and reduce the damage to the surrounding rock.

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Section: Introductionmentioning

confidence: 99%

Study on Double-Shear Test of Anchor Cable and C-Shaped Tube

Shan

Bao

Huang

et al. 2021

Shock and Vibration

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“…With the development of the mining industry [1][2][3], tailings as the waste after ore smelting also increased sharply [4][5][6]. The primary disposal method of tailings is to deposit them on the surface of the earth to form tailings dams [7].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Permeability Coefficient in Layered Fine Tailings under Seepage Condition

et al. 2021

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Nearly half of the tailings dams in China are in a state of high-security risks and overservice, and the safety of these tailings dams has always been a concern for relevant scholars. The seepage characteristics of tailings are one of the essential factors affecting the safety of tailings dam. Now, due to the improvement of mineral processing technology, there are many fine tailings dam; the study of the seepage characteristics of the tailings dam is no longer applicable. Fine-grained tailings form uneven deposition in these tailings dams, resulting in the permeability of tailings not conforming to the previous law. Therefore, it is of great significance to study the permeability of fine-grained tailings with uneven deposition. In this paper, the physical model of the simulated tailings dam is established to study the influence of the dry beach slope on the distribution and deposition law of fine tailings during discharge. The test results show that the average particle size of tailings decreases along the length of dry beach, showing the phenomenon of coarsening upstream and thinning downstream. Then, based on the data of fine tailings deposition, the variation characteristics of the permeability coefficient of layered tailings under stable and unstable seepage conditions are studied. The test results show that the variation process of tailings permeability coefficient can be divided into four stages: rapid compaction stage, slow compaction stage, failure stage, and stable stage. Under stable and unstable seepage conditions, the permeability coefficients of unstratified tailing sand are about 10% and 15% higher, respectively, than those in the initial state. The permeability coefficient of layered tailings formed by uneven settlement changes more obviously, which is about 12% and 20% higher than the initial state.

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“…Ebrahimi et al investigated static stability and free vibration characteristics of functionally graded (FG) nanobeams [20] and so on [21][22][23][24]. What is more, a suitable computational modeling and theoretical analysis could also help to solve practical engineering problems [25][26][27][28][29], especially in the underground engineering [30][31][32][33], which had experienced excellent performances. So, all the above results inspired us to establish a suitable mechanical model and mathematical modeling to get a new way to analyze the vertical instability of shaft lining structures.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Cusp Catastrophic Model for Vertical Stability of Drilling Shaft Lining

Liu

Cheng

Rong

et al. 2020

Advances in Civil Engineering

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The vertical stability analysis of the drilling shaft lining has long been a technical problem in the construction of underground space development projects. And the critical depth of vertical stability was a key parameter to judge its stability. To determine this parameter, a simple and practical computational method would be helpful. In this paper, a new vertical stability analysis model of shaft lining structure based on catastrophe theory was proposed. In accordance with the mechanical analysis, the catastrophic instability mechanics was analyzed and a new critical depth of drilling shaft lining was deduced. Further, the rationality and feasibility of the catastrophic calculation model was proved by the numerical simulation results in a case. And the sensitivity of the influencing parameters was also analyzed, which provided theoretic reference for optimization design and guiding security construction. The results implied that catastrophic calculation model, as an alternative method for shaft stability analysis, could be applied to theoretical analysis and guiding engineering practice in the study of drilling shaft lining’s vertical stability.

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Improved Nonlinear Nishihara Shear Creep Model with Variable Parameters for Rock-Like Materials

Cited by 34 publications

References 58 publications

Study on Double-Shear Test of Anchor Cable and C-Shaped Tube

Study on Double-Shear Test of Anchor Cable and C-Shaped Tube

Experimental Study on Permeability Coefficient in Layered Fine Tailings under Seepage Condition

Analysis of Cusp Catastrophic Model for Vertical Stability of Drilling Shaft Lining

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