Evaluation of load transfer mechanism under axial loads in a novel coupler of dual height rock bolts

Kumar, Ranjan; Mandal, Prabhat Kumar; Narayan, Ashish; Das, Arka Jyoti

doi:10.1016/j.ijmst.2020.12.023

Cited by 16 publications

(8 citation statements)

References 15 publications

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“…According to the Peck formula, the parameters of the Peck formula adopt the recommended values, so the theoretical values outside the jacking width are quite different from the measured values [36][37][38][39][40][41][42][43] [8], there is a multiple relationship between the width and the width coefficient of surface settlement trough.…”

Section: Settlement Curvementioning

confidence: 99%

Measurement and Analysis of Settlement Induced by Rectangular Pipe Jacking in Silt Stratum

Tang

Sheng-cai

Zhu

2021

Advances in Materials Science and Engineering

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The large-scale rectangular pipe jacking technology has attracted more and more attention in the construction of urban underground pipe galleries, especially the problem of prediction and control of the surface settlement. Taking the pipe gallery project of Chengbei Road in Suzhou as an example, the settlement values of three groups of monitoring sections under the conditions of natural settlement and synchronous grouting are monitored, and the measured settlement values are compared with Peck formula and random medium theory. The results show that the Peck formula is more accurate in predicting the natural settlement within 1.5 times the pipe jacking width, while the stochastic medium theory is more accurate in predicting the settlement beyond the width. By comparing the field test and theory, the suggestions on the prediction of ground settlement of rectangular pipe jacking of large scale are put forward. The results of this study provide a basis for subsequent related research work and engineering applications.

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Section: Settlement Curvementioning

confidence: 99%

Measurement and Analysis of Settlement Induced by Rectangular Pipe Jacking in Silt Stratum

Tang

Sheng-cai

Zhu

2021

Advances in Materials Science and Engineering

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“…Because this is a hollow hole, the stress is concentrated, and the maximum tensile stress is generated at the connection line between the blast hole and the hollow hole. When this stress is greater than the dynamic tensile strength of the rock, radial cracks will appear at the hollow hole; as the structure is continuously charged, the initial maximum tensile stress around the blast hole can be expressed as follows [28][29][30][31][32][33][34][35][36][37][38]:…”

Section: Selection Of Empty Holementioning

confidence: 99%

Influence of Hole Arrangement on the Section of Cavity Formed by Cutting Blast

Wang

et al. 2021

Geofluids

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In order to optimize the arrangement of cutting holes in tunnel blast in Dahongshan Copper Mine, theoretical analysis and numerical simulation were combined to preliminarily determine the diameter of the hollow hole and the distance between the charge hole and the hollow hole during cut blast, which was verified through the field blast test. The research results show that with the increase of the hole diameter, the peak compressive stress of rock surrounding the empty hole gradually decreases, and the peak tensile stress gradually increases, which is consistent with the calculation results; when the hole diameter is 10 cm, the two first blast holes are arranged horizontally and 30 cm from the empty hole, two second blast holes are arranged vertically and 40 cm away from the empty hole, and the four third blast holes are arranged at a horizontal distance of 45 cm and a vertical distance of 45 cm from the empty hole; the contour area in numerical simulation is the maximum. The difference in contour area, contour width, and contour and contour height between the measured value and the simulation result is 5.3%, 3.3%, and 3.4%, respectively, indicating that the combination of theoretical calculation and numerical simulation is suitable for prediction of cavity section after blast in tunnel excavation.

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“…(Li and Stillborg 1999;Chen et al 2016;Masoud et al 2020;He et al 2021He et al , 2022Yang et al 2022). With continuous technical logical advancements in anchoring bolts and structures, the anchorage force of single bolt has been increased, which consequently inspired innovations in new anchoring technology (Kilic et al 2003;Chu et al 2011;Kumar et al 2021). Hollow self-drilling anchor bolt is one of these new technologies which have been recently developed and applied in various complex geological conditions such as loose sandy soil, soft soil, fluid-plastic soil, and extreme engineering environments.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the anchoring properties of special-shaped cross-section self-drilling bolts

et al. 2022

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This paper designed a special-shaped cross-section hollow self-drilling bolt with discharge grooves, in which Mindlin’s solution of displacement was used in the elastic solution of a wholly grouted bolt. Theoretically, the ultimate pulling force and the residual pulling force were analyzed by considering the average distribution assumption of residual stress. The bolts’ performance with 2, 3, and 4 discharge grooves was compared with circular cross-section bolts, which experimental results are consistent with the theoretical results. The ultimate pulling force and the residual pulling force of the special-shaped cross-section bolt improved significantly according to the circular bolt. The bonding properties of special-shaped cross-section bolts present significant difference to circular section bolts. The residual pulling strength was contributed both by the bar-grout and grout-grout frictions. Upgrading the grout strength may further enhance the pulling strength of special-shaped cross-section bolts.

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Evaluation of load transfer mechanism under axial loads in a novel coupler of dual height rock bolts

Cited by 16 publications

References 15 publications

Measurement and Analysis of Settlement Induced by Rectangular Pipe Jacking in Silt Stratum

Measurement and Analysis of Settlement Induced by Rectangular Pipe Jacking in Silt Stratum

Influence of Hole Arrangement on the Section of Cavity Formed by Cutting Blast

Experimental investigation of the anchoring properties of special-shaped cross-section self-drilling bolts

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