Metal iron network using # 10 wire compiled diamond mesh, the mesh of 30mm × 30mm. In order to strengthen the strength of the roof support, two anchor cables are installed every 2.4 m. The anchor cable has a length of 5m and a diameter of 15.24mm. It is made of a low-relaxation prestressed steel strand and is used in combination with a W steel strip. The W steel strip model is WX180/3.0 (auxiliary slot), WX180/3.2 (transport slot). The anchor hole spacing is 1200mm. The two gangs are made of Ф18mm threaded resin anchors with a length of 1. 6m, 2 rows and 3 intervals per row. A 2,000mm long steel bar is added every 1600mm. The rib is 16# steel bar and double strands. It is welded with the same type of steel bar and used in combination with the bolt. In the recovery side of the trough, in order to facilitate the recovery, cement anchored bamboo anchors are sometimes used. 3, 3 coal seam mining roadway support design decision model support parameter design is the key to the quantitative decision-making of roadway support design. When the support type is determined, the correct design of the parameters directly affects the support effect and economic benefits. When the support parameters provide insufficient support strength, even if the support type is reasonable, it may not be able to control the severe deformation and damage of the surrounding rock of the roadway, and eventually the roadway has to be renovated, affecting normal production and economic benefits; The protection parameters are designed to be too conservative. Although the stability of the roadway during the service period can be guaranteed, the support cost is bound to be high. Therefore, scientifically looking for the optimal point between the design of support parameters in terms of safety and economy, the significance of safety production and economic benefits is obvious. In collaboration with Shandong University of Science and Technology, this project first establishes the structural mechanics model of the stope based on the latest research results of the theory of rock pressure centered on rock movement, in order to further calculate the distribution of bearing pressure on the coal around the mining face. Regularity, determine the range of internal stress field, and fundamentally solve the problem of coal pillar size along the empty channel. Based on the theoretical research results of the bearing structure pressure structure and anchor cable support, combined with the engineering practice of the Sanhekou mine for more than ten years, with reference to the mining experience of the adjacent mining area, the decision-making model for the support of the 3 coal seam mining roadway is established. . 3. 1 Calculation model of coal pillar size along the airway (model 1) 3.1.1 Model decision target The decision goal of the model is to input the parameter adjacent working surface length L along the empty channel coal pillar size S 3.1.2; The face of the old top rock beam is the first step of the pressure step C0; the distance between the peak position of the adjacent supporting face and the coal wall is S3; the total thickness of the old top rock beam of the adjacent working face M; the supporting pressure concentration coefficient K of the adjacent working face; Pick depth H. 3.1.3 Model formula: 3.1.4 Application examples Since the coal seams in the 3 coal seams are all used for top mining in the future, there is no observation data for the main mine pressure motion parameters. Therefore, the roof control design expert system was used for prediction. 3 Other relevant parameters of the upper coal seam are as follows: working surface length: 70-150m; distance of the supporting pressure peak position from the coal wall S3=20m; working surface supporting pressure concentration coefficient taking K=2.6; mining depth H=350-600m Substituting into the model, the range of internal stress fields around the goaf of the upper coal seam is calculated. 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。. The width of the groove to be considered is generally 3-4 m. Therefore, in order to arrange the groove in the inner stress region, the size of the coal pillar should be: S = (6.3 - 9.3) - (3-4) = 3-6 m as shown in Fig. 2. Shown. 3. 2 Decision-making model for bolt support parameters of mining roadway (model 2) Since the upper coal seam is mined by top coal caving technology, the trough is arranged along the coal seam floor, and the roof of the roadway is coal seam. When the roadway height is 2.5m The thickness of the top coal is approximately 2.5m. Because the top coal is thicker and its shape is arched, the bolt support parameters can be designed according to the Platts pressure-free arch theory. 3. 3 anchor cable support parameter decision model (model 3) The length of the anchor cable consists of three parts: the thickness of the top coal, the thickness of the sandy mudstone and the thickness deep into the white-gray fine sandstone . Therefore, the basic length of the anchor cable is: L anchor cable = top coal thickness + sandy mudstone thickness + thickness deep into white gray fine sandstone 4, 3 upper coal seam mining roadway anchor cable support design decision support system DSS It was developed on the basis of management information systems and operations research. That is to say, the emergence of DSS, which is different from MIS data processing, is also different from the numerical calculation of the model, but their organic integration. It has both data processing and numerical calculation capabilities. There are several ways to assist decision-making: (1) assist decision-making in the form of data; (2) assist decision-making in the form of models and methods; and (3) assist decision-making in the form of multiple model combinations. The decision support system is a human-computer interaction system (conversation component), a model library system (model component), and a database system (data component). The structure of the decision support system is shown in Figure 3. The decision support system is an organic combination of three components, namely, a dialogue component (human-computer interaction system), a data component (database management system and database), and a model component (model library management system and model library). The man-machine dialogue component includes the following functions: 1 providing rich display and dialogue forms; 2 input-output conversion; 3 controlling the effective operation of decision support. The integrated language of the data components is done by the programmed DSS control program. Data components include databases and database management systems. The model components consist of a model library and a model library management system. Including: 1 representation of the model: 2 dynamic form of the model; 3 model library management system; 4 specific functions of the model library management system. On the basis of the above research work, the implementation of the “3 coal seam mining roadway anchor cable support design decision support system†was developed. The main interface of the system is shown in Figure 4. 5, Figure 6, Figure 7. Then the system pops up the data editing window, as shown in Figure 5. You can enter data related to the lane in this interface later. 6. Conclusion The design decision system of anchor cable support in the mining roadway has been successfully applied in Sanhekou Mine, which is the concrete manifestation of scientific theory to guide production practice. Through the optimal design of roadway support for scientific management of the roof, the correct selection of support parameters and reasonable determination of support strength provide a scientific basis. The application of the system not only achieves safe production, but also achieves better social benefits and saves material consumption. It reduces the labor of workers and improves labor efficiency; the cost of pure materials per 100 m of roadway is 10,358 yuan. At present, the system can also adopt corresponding support design according to special geological conditions. PVC Vinyl Siding Panel has been widely used in the walls of various buildings, which can play the role of decoration and protection. The cost is low and the installation is easy and fast. Vinyl Siding Panels,Pvc Vinyl Siding Panel,Corrugated Roof Sheets,Decorative Plastic Wall Panels PINGYUN INTERNATIONAL , https://www.pingyunconstruction.com
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Application and Research of Design Decision System for Anchorage Cable Support in Mining Roadway
1. Introduction Bolt support is a new form of roadway support. Compared with traditional support methods, it improves the support effect, reduces the support cost, accelerates the lane speed, reduces the labor intensity, and improves the utilization of the roadway section. The superiority of simplifying the maintenance process of the end face of the mining face is very prominent. And thus subject to the general attention major coal producing countries in the world, it represents the development direction of coal mine roadway support technology. At present, the Sanhekou Mine is generally used in the support of mining roadway support. Although it has achieved significant economic benefits and safety effects, the anchor cable support parameters have been based on the experience of neighboring mining areas for a long time. There is no scientific and reasonable anchor net for the specific geological conditions and mining conditions of the mine. Support design. Therefore, with a large blindness, the lack of scientific basis for the design parameters of the support has brought hidden dangers to the safe production of the mine. In order to solve the above problems, the geological conditions of the main coal seam, the upper coal seam, and the current roadway support, can establish a set of mechanical models of anchor cable support through computer visualization, and decide to develop The design system of anchor net support for coal seam mining roadway provides the basis for the design of mining roadway support. 2, 3 coal seam mining roadway support status 3 Upper coal seam mining roadway generally adopts rectangular section, the net height of roadway is generally 2.5m, and the net width of roadway is generally 3.2-3.5m. Anchor net belt and anchor cable are used for joint support. 8米。 The top of the slabs of 18mm threaded resin anchors, the length of the bolts 1. 8m. The spacing between the anchors is 800mm × 800mm (700mm × 800mm), the row spacing is 0. 8m (0. 7m), the number of anchors in each row of anchors is 5, and the installation angle of the anchors at the shoulders is 70o, anchor The rod spacing is 0.8m. (see picture 1)