Failure Mechanism of Bolts and Countermeasures in Swelling Soft Rock Support

Guo, Zhibiao; Zhang, Lei; Wang, Haohao; Yin, Songyang; Li, Tao; Kuai, Xiaohui

doi:10.17559/tv-20180925162917

Cited by 4 publications

(1 citation statement)

References 21 publications

(21 reference statements)

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“…According to the original rock temperature of the minefield, it is divided into two grades, Grade I is 31 -37 ℃, and Grade II is above 37 ℃. High temperature not only aggravates the deformation and failure of the surrounding rock mass, induces the failure of supporting structure, spontaneous combustion of coal, reduces the equipment performance, but also seriously reduces the labor production efficiency [8][9]. It has an adverse effect on the physical and mental health of miners, making miners feel irritable, reducing alertness, increasing the accident rate, and even leading to the death of miners from heat stroke and heat exhaustion.…”

Section: Introductionmentioning

confidence: 99%

Present Geothermal Field and Roadway Heat Damage Characteristics in Zhujidong Coal Mine Area of Huainan City, Anhui Province, China

2024

Teh. vjesn.

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With the normalization of deep mining, the problem of mine thermal damage has been widely concerned. In this paper, 64 logging temperature data of surface boreholes of Zhujidong coalfield in Huainan City, Anhui Province, China, were summarized and sorted. The temperature data of 12 measuring points at the current main working level of −906 m and −965 m were measured. The ground temperature conditions of the vertical direction, horizontal direction, and main coal seam floor in the coalfield were analyzed. The characteristics of the present geothermal field and roadway heat damage, and its influencing factors were discussed. The results showed that the geothermal gradients of this area are between 1.7 ℃/hm and 3.6 ℃/hm, and the average geothermal gradient is 2.607 ℃/hm. It shows the transmission of warming in the vertical direction and horizontal direction shows the ground temperature lowering from south to north, east to west. The geothermal field in this area is mainly affected by the geological structure, and the thermal physical properties of rocks, magmatic rocks and groundwater activities also have a certain effect. At present, most of the main work level has reached the first heat hazard area, and some are in the second heat hazard area, according to Chinese regulations. The working face temperature is keeping above 28 7 ℃ and the relative humidity is being maintained above 70% for a long time. The problem of heat damage is extremely serious. It is suggested to construct the thermal environment control measures combining active and passive ways.

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Section: Introductionmentioning

confidence: 99%

Present Geothermal Field and Roadway Heat Damage Characteristics in Zhujidong Coal Mine Area of Huainan City, Anhui Province, China

2024

Teh. vjesn.

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Lateral damage mechanism of the double-track tunnel in the mountainous layered soft rock and NPR anchor cable control

Sui

Ting-ting

et al. 2023

Underground Space

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Bearing Characteristics of Surrounding Rock of Deep Mining Roadway with Full and End Bolt Anchorages: A Comparative Numerical and Experimental Study

Shi

et al. 2021

Advances in Civil Engineering

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The support strength of surrounding rock in deep mining roadways can be significantly improved by replacing the end bolt anchorage with a full one. The support effects of both types of anchorage and the axial stress distribution characteristics in anchored bolt bodies were assessed via the indoor pull-out test, simulated via the FLAC3D software, and verified by field measurements. The stability and variation patterns of the axial force, as well as the evolution law of bearing characteristics of surrounding rock, were analyzed. The results indicate that the polymorphic deformations of deep mining roadway surrounding rock and the bolt support body interact synchronously. The axial force evolution trend in bolt bodies with end anchorage revealed by field tests was consistent with the laboratory test results, in contrast to that of full anchorage. Although stress distribution laws in both sides of the mining roadway were the same for both types of anchorage, the vertical stress peak and damage range of full-anchored surrounding rock slightly exceeded those of the end-anchored one. The anchored area bearing a higher load alleviated the stress concentration of the surrounding rock. Since the deformations in fully and end anchored surrounding rocks increased gradually and sharply, respectively, the full anchorage is more conducive to deformation moving control of deep mining roadway surrounding rock. The research results can provide theoretical guidance for the design and construction of deep mining roadway bolt support.

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Failure Mechanism of Bolts and Countermeasures in Swelling Soft Rock Support

Cited by 4 publications

References 21 publications

Present Geothermal Field and Roadway Heat Damage Characteristics in Zhujidong Coal Mine Area of Huainan City, Anhui Province, China

Present Geothermal Field and Roadway Heat Damage Characteristics in Zhujidong Coal Mine Area of Huainan City, Anhui Province, China

Lateral damage mechanism of the double-track tunnel in the mountainous layered soft rock and NPR anchor cable control

Bearing Characteristics of Surrounding Rock of Deep Mining Roadway with Full and End Bolt Anchorages: A Comparative Numerical and Experimental Study

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