Study On The Law Of Side Slope Surface Movement And Deformation Caused By Mining Activity

With the rapid growth of Chinese national economy, there is an increasingly high demands for mineral resources. And because of the large number of underground mineral excavations, some of the old industrial cities have formed many large-scale mined-out areas, which caused increasingly serious geological disasters. In the meanwhile, with China's urbanization and growing urban population, a number of large industrial plants, civil construction, tunnels, highways and bridges have to be built on top of the mined-out areas. The western cities, which are rich of coal, are mainly located in the hills and mountainous areas. Because of bad plan of coal areas caused by different forecast of surface movement subsidence and angles, some mined-out areas, which are caused by coalfaces directly or indirectly influence the stability of the side slopes, are easily formed the geological disaster such as landslide, collapse, subsidence, which greatly affect the seriously affects personal and property safety and the stability of buildings. Thus, study on the side slope stability of mined-out areas becomes quite important. The thesis is adopting Haoyu and BeiYa mined-out area around Hou ma expressway which ranges from Yang cheng to Guang meng(the following paper calls it Yang Guan for short). It formed mathematical model by employing field investigation, similar material simulation experiment and 3D software, and systematically analyzed and investigated stability of side slope'overburden rock and laws of ground deformation and movement, fractures of distribution development in mined-out areas, as well as residual deformation of mined-out areas under the load functions, whose process is according to the mining width of coal face from. The main achievements made in my thesis are as follows:1. According to the physical model test, the writer investigated the mining subsidence laws, influences of overburden rock movement and ground deformation in single seam conditions of room and pillar mining, in line with different mining width and thickness, burial depth, geomorphic factors.2. The writer also investigated residual deformation laws in different level load, and confirmed the influence depth and influence scope of load.3. The writer simulated the coal exploitation in FLAC 3D software, gained displacement, stress diagram and disruption field figure map, which is made after exploitation. I also analysed the stability of the overburden rock of side slope and the deformation and damage of terrain in different side slope angles, drew the different curve diagram of surface movement which is according to simulated data, discussing the general rules the overburden rock movement and subsidence in side slopes.4. The writer simulated the coal exploitation in FLAC 3D software, gained displacement, stress diagram and disruption field figure map, which is made after exploitation. I also analyzed the stability of the overburden rock of side slope and the deformation and damage of terrain in different coal mining face of side slope (from small to large), drew different curve to discuss the general rules the overburden rock movement and subsidence in side slopes.