Experimental studies on the mechanical properties and deformation &amp; failure mechanism of U-type confined concrete arch centering

Wang, Q.; Jiang, Bei; Li, S.C.; Wang, Dacang; Wang, F.Q.; Li, Wen Ting; Ren, Yuchen; Guo, N.B.; Shao, Xingling

doi:10.1016/j.tust.2015.10.010

Cited by 48 publications

(10 citation statements)

References 13 publications

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“…The constitutive relationship of steel and core concrete is based on the results of reference [ 26 ], and the stress-strain relationship is adopted which is applied to ABAQUS.…”

Section: Methodsmentioning

confidence: 99%

“…The confined concrete structure has many advantages, such as high bearing capacity, good plasticity, convenience in construction and obvious economic, so it has been widely adopted in ground engineering [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 ]. In recent years, researchers, including the authors’ team, have applied the confined concrete supporting method to underground engineering with complex conditions [ 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

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Comparative study on the mechanical mechanism of confined concrete supporting arches in underground engineering

Qin

Jiang

et al. 2018

PLoS ONE

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In order to solve the supporting problem in underground engineering with high stress, square steel confined concrete (SQCC) supporting method is adopted to enhance the control on surrounding rocks, and the control effect is remarkable. The commonly used cross section shapes of confined concrete arch are square and circular. At present, designers have no consensus on which kind is more proper. To search for the answer, this paper makes an analysis on the mechanical properties of the two shapes of the cross-sections. A full-scale indoor comparative test was carried out on the commonly used straight-wall semi-circular SQCC arch and circular steel confined concrete arch (CCC arch). This test is based on self-developed full-scale test system for confined concrete arch. Our research, combining with the numerical analysis, shows: (1) SQCC arch is consistent with CCC arch in the deformation and failure mode. The largest damages parts are at the legs of both of them. (2) The SQCC arch’s bearing capability is 1286.9 kN, and the CCC arch’s ultimate bearing capability is 1072.4kN. Thus, the SQCC arch’s bearing capability is 1.2 times that of the CCC arch. (3) The arches are subjected to combined compression and bending, bending moment is the main reason for the arch failure. The section moment of inertia of SQCC arch is 1.26 times of that of CCC arch, and the former is better than the latter in bending performance. The ultimate bearing capacity is positively correlated with the size of the moment of inertia. Based on the above research, the engineering suggestions are as follows: (1) To improve the bearing capacity of the arch, the cross-sectional shape of the chamber should be optimized and the arch bearing mode changed accordingly. (2) The key damaged positions, such as the arch leg, should be reinforced, optimizing the state of force on the arch. SQCC arches should be used for supporting in underground engineering, which is under stronger influence of the bending moment and non-uniform load on the supporting arches. The research results could provide a theoretical basis for the design of confined concrete support in underground engineering.

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“…The constitutive relationship of steel and core concrete is based on the results of reference [ 26 ], and the stress-strain relationship is adopted which is applied to ABAQUS.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparative study on the mechanical mechanism of confined concrete supporting arches in underground engineering

Qin

Jiang

et al. 2018

PLoS ONE

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“…e size of the roadway in this section was reduced from 4.6 m × 4.0 m to 3.5 m × 3.0 m. Although repaired many times, the repairs did not effectively reduce the deformation in the roadway. A new "shell + bolt + shotcrete" structure was proposed that was inspired by a long span shell structure [16][17][18][19], and this was combined with the existing support structure to support the fracture zone.…”

Section: Engineering Backgroundmentioning

confidence: 99%

A Case Study on the Control of Large Deformations in a Roadway Located in the Du’erping Coal Mine in China

Yang

Liang

et al. 2019

Advances in Materials Science and Engineering

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The effective control of large roadway deformations has always been a focus and difficulty in the coal industry. At present, a “bolt + cable + mesh + shotcrete” combined support structure has been widely used in China to support roadways with large deformations, and this method has achieved some success. However, large roadway deformations supported by using the “bolt + cable + mesh + shotcrete” support structure still have a series of engineering problems. This paper describes a case study of large deformation control in a roadway surrounded with broken rock located in the Du’erping coal mine in the Shanxi Province of China. A new “shell + bolt + shotcrete” combined support structure is proposed to support the north wing main haulage roadway. Methods were adopted from theoretical analysis, numerical simulation, and similarity simulation experiments to design a reinforced shell within a vertical wall semicircular arch. Roadway convergence and surrounding rock stress were monitored on the site. The monitoring data showed that the new support structure successfully controlled a potentially large deformation of the roadway. This new combined support structure provides a helpful reference for the design and engineering of support structures to prevent large roadway deformations.

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“…erefore, arch-bolt-shotcrete combined support became a common used reinforced support style for the above conditions. e supporting arches mainly include the traditional U-shaped steel arch [3][4][5] and the new developed concrete-filled steel tubular arch [6][7][8][9]. But sometimes this kind of high-strength support still cannot prevent the roadway deformation and failure.…”

Section: Introductionmentioning

confidence: 99%

Failure Mechanism and Optimization of Arch‐Bolt Composite Support for Underground Mining Tunnel

Mei

Yang

et al. 2020

Advances in Civil Engineering

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Numerical simulation tests were performed on the arch-bolt combined supported mining tunnel through an improved numerical simulation approach. The typical soft rock roadway was took as the background, and the influencing factors such as ground stress level, lateral pressure coefficient, and support type and parameters were considered. The failure mechanism of a semicircular roadway with two straight walls was analyzed; results showed that the arch legs’ inward bending deformation and the arch-rock separation are the breakthrough of the global failure of the supporting system, and rock bolts breakage promoted the failure process. The effects of different controlling measures were analyzed including enlarging the bolt diameter, replacing the conventional bolts with energy-absorbing bolts, and setting arch locking bolts on the arch legs. The field test of the concrete-filled steel tube (CFST) arch-bolt composite support scheme was carried out in a high-stress soft rock roadway, and the results indicate the reliability of the main conclusions.

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Experimental studies on the mechanical properties and deformation & failure mechanism of U-type confined concrete arch centering

Cited by 48 publications

References 13 publications

Comparative study on the mechanical mechanism of confined concrete supporting arches in underground engineering

Comparative study on the mechanical mechanism of confined concrete supporting arches in underground engineering

A Case Study on the Control of Large Deformations in a Roadway Located in the Du’erping Coal Mine in China

Failure Mechanism and Optimization of Arch‐Bolt Composite Support for Underground Mining Tunnel

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