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General situation of coal roadway support development
Roadway support technology is one of the important contents of coal mining. With the popularization and application of bolt support technology, the superiority of bolt support is shown. Having the advantages of being stable and reliable, low cost and fast construction speed, bolt support has been widely used in coal mine and has become the main direction of the development of roadway support technology. The support form of bolt support technique in coal mine can be divided into two types: bolting net belt support and bolting net shotcrete support.
BTP-01: Using bidirectional tensile plastic net in roadway can provide strong engineering construction experience for the mine.
BTP-02: There are specific technical parameters and specification of bidirectional tensile plastic net for roadway supporting.
The form of bolting net belt support:
The form of bolting net shotcrete support:
In order to make the bolt support play more supporting effect and ensure the safety of the roadway use, the development trend of bolt support technology in recent years is inclined to improve the strength of roadway support and ensure its reliability. Taking the strength improvement of both bolt support rod and its matched steel band as the breakthrough point, while ignoring the support efficiency of auxiliary net, leads to serious deformation of roadway after being formed, roof separation and the formation of net pockets. At the same time, partial leaky roof and caving accidents occurs and the return repair rate of partial dynamic pressure roadway is up to 65%. In view of this supporting weakness, this paper investigates the bidirectional tensile plastic net and carries out industrial test and comparative observation and analysis of mine pressure.
General situation of industrial test
Underground industrial test situation of the bidirectional tensile plastic net: Through the underground industrial test, a complete inspection can be conduct to the feasibility of adopting bolt support in mine crossheading roadway IV and V class unstable surrounding rock, support design and construction technology, in order to further guide and modify the initial design of bolt support in coal mine. Underground industrial test is also an important link of the dynamic design of coal roadway bolting. Through the test and the observation of roadway rock pressure characteristics, we can draw the deformation and failure law of roadway under actual conditions and the actual effect of bolt support, so as to determine the reasonable support type and improve the scientific and reasonable basis. By doing this, the supporting technology of the bolt support can be more reasonable and the roadway support technology can be more mature.
Main technical parameters
The bidirectional tensile plastic net is a new type of protective net specially used in the support of coal mines. It takes polypropylene as the basic material. After the treatment of the anti-static and flame retardant technology, the integral structure of the grid is formed by the bidirectional stretching method, and the comprehensive performance is improved under the premise of guaranteeing the strength. Compared with ordinary plastic mesh and metal mesh and metal warp and weft net, the utility model has the following characteristics.
|Compressive strength (MPa)
|Breaking strength (N)
|Unit price (dollar/m2)
|Warp & weft wire mesh
The evaluation of use effect
The application of bidirectional tensile plastic net greatly improves the support strength of side support and avoids the vulcanization, oxidation, brittle fracture phenomenon which often happens on diamond-shaped mesh and iron wire net. It can also exert the active support efficiency of surrounding rock, and ensure the reliability of side support and the safety of service stage. The use of the bidirectional tensile plastic net not only greatly improves the roadway support strength and reduces the deformation of the roadway, but also avoids the input of material and manpower for two times due to the serious deformation of the roadway and can not meet the production requirements. in addition, it greatly reduces the comprehensive cost of the roadway.
Through the observations, under the original support form, the average shift of the two sides of roadways in 890 mm. Moreover, in the dynamic pressure roadway, the moving distance of the two sides nearly accounts for 60% of the roadway width. Phenomenons, such as steel bands on the supporting side are torn, anchors are fracture failure and the supporting sides are badly damaged, occur, which make the roadway not working properly. Through the application effect, using a bidirectional tensile plastic net with metal anchor bolts and protective steel band, the closure amount of two sides of roadways is 350 mm–470 mm. The overall stability of the coal body on the both sides lays the foundation for the reliability of roof support.
The kind of net is not only reliable, but also has good flexibility. It can be transported quickly and installed easily in the construction of roadways, thus improving the construction speed and reducing the labor intensity of the workers effectively.
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