| Coal is the fundamental source of energy and is essential industry in the national economy and the people’s occupation in Vietnam. The needs for more resources, the majority of open-cast mining have been converted into underground mining when mining depth is deep enough. Increasing the amount of roadway excavation, mining deeper and deeper depth roadway affected by mining pressure greater roadway support is very important. Keep unimpeded of roadway surrounding the rock stability of coal mine safety in production is of great significance. Coal mine roadway has the long process from the wooden, arching and bolting support. The practice at home and abroad proves that bolting support is quite economical and effective support way. Worldwide researches show that the bolt support (support system) is in mining more economic and effective support form. Compared with covered stent, the bolt support can significantly improve the effectiveness of roadway support, reduce the support costs and reduce labor intensity. More important is to bolt support can greatly simplify the advanced coal mining working face support and supporting techniques, roadway maintenance workload, significantly reduce the rapid advance of the coal mining face, increase output and benefits to create a good condition.So far, bolting in coal mine in Vietnam is mainly used in rock, but in coal which has not been using anchor rod anchor combined support, coal roadway supporting is mostly about awning type support. The traditional supporting structures such as concrete supports, reinforced frame supports, timber sets, etc., have not ensured the high rate of construction, necessary safety for the constructions under the complicated geo-mechanical conditions. The passive supporting structures have not increased the bearing capacity of the surrounding rocks; therefore, the compression pressure on the arch lining is great. In the case that support works are not carried out in time, packing and backfilling operations are not enough, therefore, the stability of the rock layers will be decreased and at the certain time, they will be destroyed. This thesis investigates the technology of bolt and cable combined support in the soft rock coal roadway in Quang Ninh mine, Vietnam. Accordingly, roadway in the special mining, coal seam of the12th of KheCham coal mine, is carried out under conditions of soft rockcoal Road anchor combined support technology system. Based on the analysis of underground supportive theory and state of coal mine bolt support technology, the status of stoping roadway deformation and supporting of the special area, that analyzing deformation damage factors and the mine pressure theory, which using mechanics analysis, mechanical structure model for theoretical research is established. Basis of analysis of the recent phenomenon of underground program support theory and coal mine roadway bolting support technology, deformation and failure factors have been analyzed according to deformation of soft rock roadway status and typical geology condition support and also a mechanical analysis to back digging roadway according to mine pressure theory is done, subsequently mechanical structure models and conduct theory research is built. Accordingly, Four kinds of simulation schemes, through numerical simulation to determination of support parameters, setting underground mine pressure observatories and finally determining the reasonable support program is designed. |
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