Assessment of Bearing Capacity and Stiffness in New Steel Sets Used for Roadway Support in Coal Mines

Yang, Renshu; Li, Qing; Zhu, Xiaodong

doi:10.3390/en10101581

Cited by 12 publications

(7 citation statements)

References 22 publications

(28 reference statements)

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“…Yang et al [14] used a numerical calculation method to reveal the deformation characteristics and crack propagation mechanism of the surrounding rock of a deep soft rock roadway and proposed the support scheme of "bolt-cable-mesh + shell." Aiming at the problem of large deformation of a soft rock roadway, Yang et al [15] developed a U-steel set with a roof + floor beam + braces set. In order to meet the requirements of green mining and prevent mine pressure disaster, Mu et al [16] proposed a novel segmented roadside plugging-filling mining method.…”

Section: Introductionmentioning

confidence: 99%

Research on the Deformation Mechanism and Directional Blasting Roof Cutting Control Measures of a Deep Buried High-Stress Roadway

Yang

Liu

Yue

et al. 2020

Shock and Vibration

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Affected by the mining activities of the working face, the surrounding rock of the roadway is easily deformed and destroyed. For deep buried roadways, the deformation and destruction of the surrounding rock is particularly prominent. Under the influence of in situ stress fluctuation, 3−1103 tailgate of the Hongqinghe coal mine was in a complex stress environment with a maximum stress exceeding 20 MPa. Affected by mining stress, the roadway behind the working face was seriously deformed. In order to alleviate the deformation of the roadway, directional blasting and cutting measures for the 3−1103 tailgate were adopted in this paper. The mechanism of crack propagation in single-row to three-hole directional blasting was revealed by numerical simulation. The blasted rock was divided into three regions according to the crack condition. The numerical analysis of the cutting heights of 0 m, 10 m, 12 m, and 14 m, respectively, showed the stress peaks of different cutting heights and the deformation law of the surrounding rock. The pressure relief effect was the best at 14 m cutting height. At this time, the peak stress was 39 MPa with the smallest roadway deformation. Based on numerical simulation and theoretical analysis results, engineering tests were carried out. Field monitoring showed that the deformation of the roadway was inversely proportional to the roof cutting height. The higher the cutting height is, the more preferential the roadway is to reach the stable state. It can be concluded that directional blasting can change the surrounding rock structure, control the deformation of the roadway, and play a role in pressure relief. It provides a new measure to control roadway deformation.

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Section: Introductionmentioning

confidence: 99%

Research on the Deformation Mechanism and Directional Blasting Roof Cutting Control Measures of a Deep Buried High-Stress Roadway

Yang

Liu

Yue

et al. 2020

Shock and Vibration

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“…e nearly material 12.6 ordinary I-section steel (I12.6) (parameters are shown in Table 1) [29], with ratios of 0.40, 0.53, and 0.55 to U36 in parameters of the sectional area, moment of inertia, and section modulus, was chosen as the scaled sets material. After manufacturing, the scaled original set was decomposed into four segments: top arch, bottom arch, and two branches on the ground.…”

Section: Scaled Sets In Experimentsmentioning

confidence: 99%

“…is type of set, commonly used in situ, is designated as the original set for subsequent analysis. Based on the original set, three new sets, including a floor beam set, a roof + floor beams (RFB) set, and a roof + floor beams + braces (RFBB) set have been developed [29]. In the floor beam set, a floor beam is added in the bottom corner compared with the original set ( Figure 1(b)).…”

Section: Introductionmentioning

confidence: 99%

Strength and Cost Analysis of New Steel Sets as Roadway Support Project in Coal Mines

Yang

Wang

et al. 2018

Advances in Materials Science and Engineering

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Roadway support in swelling soft rocks in coal mines has become a critical challenge in recent years. For deformation control in swelling soft rocks, high strength sets are preferred in sites. But high strength always means high costs. Therefore, higher strength sets with not too much cost will be more welcomed in situ. Based on this, three new sets, including a floor beam set, a roof + floor beams set, and a roof + floor beams + braces set, have been developed in the present research. Strength comparisons and costs comparisons have been conducted in this research. Results illustrate that compared with the original set, in the floor beam set, the relative strength of bottom corners reaches 2.964, while the relative cost reaches 1.294; compared with the original set, in the roof + floor beams set, the relative strength of the top arch reaches 2.345, while the relative strength of bottom corners reaches 2.964, and the relative cost reaches 1.568; and compared with the original set, in the roof + floor beams + braces set, the relative strength of the top arch reaches 2.635, and the relative strength of bottom corners reaches 5.905, but the relative cost reaches 1.930. Floor beam set and roof + floor beams set illustrate higher strength and not too higher costs than the original set. Although the roof + floor beams + braces set exhibit much higher strength, they also demonstrate much higher costs than the original set. These new sets can be chosen according to different geological conditions in situ.

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“…With the continuous development of China's roadway support technology, its support mode gradually changes from the traditional passive support forms such as woodpile support, concrete masonry support, and steel frame support to the active support forms such as bolt shortcoming support, bolt mesh cable shortcoming support and bolt grouting support, and the properties of support materials also change from low strength and low elongation to high strength and high elongation [15][16][17][18][19]. Generally speaking, roadway support form and strength design are closely related to the surrounding rock mining conditions and instability mode.…”

Section: Introductionmentioning

confidence: 99%

Surrounding Rock Stability Control Technology of Roadway in Large Inclination Seam with Weak Structural Plane in Roof

Chen

et al. 2021

Minerals

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The surrounding rock control technology of mining roadways in large inclination seams with a weak structural plane in the roof is one of the most challenging fields in underground roadway support. In view of the serious deformation of the surrounding rock of the transportation roadway in the 1201 working face of a mine, the deformation and failure characteristics and instability mechanism of the surrounding rock of the roadway are analysed. The self-stability mechanical model of the roof block structure of the roadway with a large inclination under the support effect is established, and the support concept of “high pre-stressed asymmetric” and the combined support method of bolts, wire mesh, and cables are proposed. The rationality of the supporting scheme is verified by numerical simulation. The results show that: compared with bolt and wire mesh support, the maximum shear displacement of the roof’s weak layer under the combined support of bolt, wire meshes, and cable before and after mining is reduced by 86.78% and 83%, respectively, and the maximum total displacement of surrounding rock surface is reduced by 49.22% and 37.1%, respectively. The field monitoring results show that the combined support scheme can effectively control the deformation of the surrounding rock.

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Assessment of Bearing Capacity and Stiffness in New Steel Sets Used for Roadway Support in Coal Mines

Cited by 12 publications

References 22 publications

Research on the Deformation Mechanism and Directional Blasting Roof Cutting Control Measures of a Deep Buried High-Stress Roadway

Research on the Deformation Mechanism and Directional Blasting Roof Cutting Control Measures of a Deep Buried High-Stress Roadway

Strength and Cost Analysis of New Steel Sets as Roadway Support Project in Coal Mines

Surrounding Rock Stability Control Technology of Roadway in Large Inclination Seam with Weak Structural Plane in Roof

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