Study on the construction and design method of bolting support in coal roadway

Scientific supporting design is of great significance to ensure coal roadway stability. The three-step supporting design method is put forward for coal roadway support: The first step is preliminary design, determine the range of each supporting parameter according to the theoretical calculation and supporting experiences; the second step is numerical simulation calculation, choose the reasonable one through the comparison of schemes; the third step is field monitoring, verify the scheme applicability. After applying the three-step supporting design method to study 3# coal seam roadway in Guandi mine, the optimal supporting scheme is obtained, and good results of underground roadway are achieved, which ensure the stability of roadway surrounding rock. Meanwhile, some rules are summarized which provide references for future roadway supporting design.

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Analytical Solution for the Deformation and Support Parameters of Coal Roadway in Layered Roof Strata

Geofluids ◽

10.1155/2021/6669234 ◽

2021 ◽

Vol 2021 ◽

pp. 1-9

Author(s):

Kai Wang ◽

Bao-gui Yang ◽

Zhong-kui Wang ◽

Xiao-long Wang

Keyword(s):

High Efficiency ◽

Design Method ◽

Beam Theory ◽

High Strength ◽

Failure Criteria ◽

Key Stratum ◽

Coal Roadway ◽

The Stability ◽

Roof Strata

In order to meet the security and high-efficiency production needs, high-strength bolt (cable) reinforcement technology is usually used to maintain the stability of roadways. However, due to the great variability of lithology and mechanical properties, the failure form and stability of the layered roof in coal roadways are significant differences. The traditional supporting design method of the layered roof support in coal roadways is the engineering analogy method, which depends on experiences rather than theoretical analysis. Based on the theory of the elastic foundation beam and key stratum, this paper establishes a simplified analytical model of layered roof strata in coal roadways. Based on the Mohr-Coulomb theory, this paper gives the failure criteria of the layered roof strata, and the failure range of the layered roof strata is obtained. The length and pretightening force of bolt (cables) of the layered roof strata can be calculated based on the suspension theory and composite beam theory, which providing a quantitative theoretical basis for the determination of supporting parameters. Finally, as a case, the layered roof strata failure range and supporting parameters of the S1301 auxiliary transportation roadway in Gucheng coal mine are calculated.

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Based on Mathematical Simulation of the Supporting Design Method in Gateway

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.616-618.301 ◽

2012 ◽

Vol 616-618 ◽

pp. 301-305

Author(s):

Cheng Wen Zhang ◽

Wan Bin Yang ◽

Hui Dong

Keyword(s):

Objective Function ◽

Mathematical Simulation ◽

Design Parameter ◽

Design Method ◽

Failure Zone ◽

Coal Roadway ◽

Natural Factors ◽

Roadway Stability ◽

Geological Conditions ◽

The Stability

The stability of roadway is subject to a variety of conditions, including geological conditions, and other natural factors can not be changed, it must be through supporting the roadway stability. At present the design of supporting parameters in the gateway have many methods, but there are some shortcomings. This paper used non-linear FEM to optimize the supporting parameters. The coal roadway minimum failure zone within surround rock has been set as objective function. The results show that: The support parameters and the failure zone within surround rock exist optimal relations, which can be used as a method of supporting design parameter.

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