1、 About coal mining subsidence prevention and control technology Xinzhijun Abstract: This paper of mine for the coal mining environment, the effects of surface damage and to mitigate the damage as the goal, according to the mining area should be a reasonable application of mining methods and technolo
2、gy, to the prevention and control of mining subsidence. Keywords: land reclamation mining subsidence subsidence control Introduction： Coal in Shanxi province, Shanxi coal for the development of rapid and sustained economic development has provided the basic guarantee, however, large-scale exploitati
3、on of coal mine and its surrounding environment has resulted in serious damage to an increasingly prominent mining subsidence mining environmental disasters caused by the main land collapse or water, agricultural production or no production, road collapse, deformation and damage, such as housing, th
4、is is caused by the exploitation of strata movement is a disaster caused by mining subsidence and regional deformation of the root causes of and effective control and reduce the degree of ground subsidence is a solution to this problem fundamental way. With the improved form of coal, have increased
5、the Groups control environment and governance, the cause of the coal is reactive in that will benefit future generations. 1. Subsidence means of control techniques Subsidence damage control measures will be considered in two ways: (1) the control of mining subsidence, that is, through the rational c
6、hoice of mining methods and technology, rational arrangement of mining face, take underground filling law, separation of overlying strata with measures such as space filling to reduce surface subsidence, control the speed and extent of surface subsidence, to protect surface and ground built structur
7、es with the purpose of arable land. (2) mining subsidence damage restoration and remediation, the use of land reclamation technology and building anti-mining deformation technology, mining subsidence damage remediation and use of land. 1.1 All backfill mining In the coal after mining has yet to take
8、 off before the roof with a solid material to be dense goaf filling, so that only yields a small amount of roof rock sinking in order to reduce surface subsidence and deformation of the ground to protect the building, structure or purpose of farmland . Which is the filling of water and sediment fill
9、ing in the mining method to reduce the effect of surface preparation methods subsidence, followed by the wind and filling away from the filling of waste.However, filling mining method of filling the need for specialized equipment and facilities, but also the need for adequate filling material.Initia
10、l investment of mine, and tons of coal a corresponding increase in cost. 1.2 strip mining Based on coal and overlying strata combination of conditions, according to a certain ratio of mining to remain in the coal seam was mined in a recovery to retain one. As a result of strip mining is only part of
11、 the underground mining of coal resources, coal in order to retain a portion of coal overlying strata cylindrical support. Thereby reducing the overburden rock movement, control the movement and deformation of the surface to achieve on the ground to build structures of protection. However, the metho
12、ds of the low rate of recovery, tunnel boring, and inefficient working. 1.3 Filling the cover rock band separation Mined-out area in accordance with the top of the cover rock band mobile form a three-shift characteristics of the rock, in coal mining after a certain time interval, with drilling to th
13、e separation of space with high-pressure grouting, filling, reinforced with separation of space, will be mining the reinforced masonry beam structure for better stability of the continuous beam structures, so that separation of space with the sink is no longer transfer to the surface in order to red
14、uce or mitigate surface subsidence, the protection of ground built structures or farmland. However, the technical difficulty, and then further study. 1.4 Mining thick limit According to the mining area topography, hydro-geological conditions and building the capacity of anti-deformation structures i
15、n order to not produce the surface water and to meet the requirements of the protection of buildings based on grades to determine the thickness of coal seam can be mined, mining is only the thickness of the coal mining, none of the remaining coal mining, in order to achieve reduction in the protecti
16、on of ground subsidence building, structures and land use. However, the low rate of recovery techniques, only the application of thin coal seam a certain value. 1.5 Coordination of the exploitation of Slice mining thick coal seam, the rational design of the exploitation of the working face spacing,
17、location and exploitation of the order of each other, so that a coal mining (face) surface deformation generated by coal and the exploitation of another (face) surface deformation arising from mutual offset or partially offset to reduce the mining of surface deformation caused by the protection of g
18、round built structures. However, the technologys fault in order to maintain a certain distance, it is difficult to organize production. China has yet to carry out such industrial experiment. 1.6 Picking - Note - adopted three-step extraction Take full advantage of the structure of overburden rock st
19、rata movement of the control, application of the principle of load replacement for small strip mining - the consolidation grouting filling goaf - strip mining the remaining three-step extraction method, effective mobility and the surface of the rock subsidence control, to solve the large-scale explo
20、itation of ground subsidence control, increased the rate of coal mining, the protection of the ground built structures, but there are complex processes, such as the shortcomings of higher cost. 2. Land Reclamation Technology 2.1 Reclamation of coal gangue and fly ash filling Filling Reclamation (1) generated a large number of underground mining to surface emissions of coal gangue, is there an area of pollution of the environment. The use of coal waste as filling material, so that mining can restore damaged land and reducing the amount of waste to.
