Study On Stability Evaluation And Treatment Technology Of Small Coal Kiln Goaf In 2×660MW Project Of Youtou Power Plant

As China's economic situation develops increasingly well,the consumption of underground mineral resources in China has also increased.Due to the serious exploitation of underground mineral resources,more goafs remain.With the increase of mining time,over time,the area of goaf is increasing.Due to various environmental factors such as rain and water,the upper rock layer has lost its effective supporting effect.Therefore,ground collapse and ground fissures have occurred many times.People have a more serious impact.This paper relies on the 2×600MW project small coal kiln damage area treatment project of the storehead power plant,and determines the location and scale of the goaf by collecting a large number of geological data from the study area and the mining data of the coal mine plus the resistance anomaly.Combined with the five major influencing factors of goaf instability,the rational design of the goaf is designed and implemented effectively.In addition,the method of grouting filling is adopted to effectively fill the pores and voids in the caving zone of goaf,so as to enhance the rock compactness of caving zone,improve the overall stiffness of the original caving zone rock masonry structure,and prevent the continuous caving of roof.Through the drilling detection,stone body strength detection,geophysical(elastic wave method),intra-hole TV detection,transient electromagnetic method(contrast)detection and other technical means to verify the governance of the goaf after the treatment.The results show that:(1)An evaluation system for the evaluation of surface stability of goaf is proposed for the stratum of the study area,the engineering geological characteristics of the rock and soil,the geological characteristics of coal and the mining conditions.The results of stability evaluation show that the goaf in the study area is irregular mining of small coal mines.The stability grade of the study area is unstable,and the undercut goaf is extremely harmful.It is necessary to take necessary engineering measures and prevention.Countermeasures.(2)According to the actual situation of the goaf area,the goaf area is poorly suitable as the power plant site.It is recommended to adopt the“grouting and filling" treatment system for the goaf.The governance can be divided into the governance I zone and the governance zone ?.Through the formula V void=S × m × K × AV,S is the goaf area,m is the coal seam thickness,K is the coal seam recovery rate,and AV is the residual deformation amount.Calculate the void volume and filling volume in the goaf.The grouting holes in the treatment area were laid out in detail,and the grouting process and parameters were effectively designed.(3)According to the geological structure characteristics of the goaf,engineering geological conditions and the actual situation of the site,the governance project was tested and verified after the treatment project,and the treatment effect was evaluated.In this paper,drilling engineering,stone strength testing,geophysical engineering,intra-hole TV detection,transient electromagnetic method and other technical methods are adopted to verify the effective engineering engineering.Therefore,it is of great significance to carry out stability evaluation and reasonable design and management schemes for the goaf and effectively implement it to reduce the adverse impacts of geological disasters caused in the later period.