Study On Monitoring And Identification Of Land Subsidence In Hongguo Coal Mining Area Of Panzhihua Radar And Optical Remote Sensing

Ground subsidence is an nonreversible geological disaster phenomenon,which is caused by the interaction of natural and human activities and regional land elevation decreases,due to the consolidation and compression of underground loose strata.There are abundant coal resources in Hongguo Yi nationality town of Yanbian County,Panzhihua,where the mining is developed.The land subsidence in the mining area is serious there.Then the research of land subsidence monitoring and identification is of great significance.In this paper,the ground subsidence identification of the coal mine concentration area in Hongguo Yi Town,Yanbian County,Panzhihua is studied by using advanced satellite SAR interference measurement technology and optical remote sensing data(Gaofen No.2).The characteristics of the ground subsidence in the mining development in the research area are well revealed,and the causes of the ground subsidence of the coal mines are analyzed deeply,which is the development of the ground subsidence for the coal mines in the research area.The countermeasures and suggestions for the prevention and control of the ground subsidence were provided.The research results are listed as follows:1)The surface deformation monitoring of the research area was carried out using the radar remote sensing SBAS InSAR technology and 34 scene multi-phase sentinel-1A data.Then the whole surface deformation characteristics of the research area were obtained.The results showed that the surface deformation parameters can be used as the main indicators of the regional ground subsidence.2)The results show that the visual interpretation of ground subsidence based on optical remote sensing can be used as the main indicator of the individual surface subsidence.3)Combined with the monitoring of regional surface deformation and the study of individual ground subsidence,the characteristics of the ground subsidence in the study area are summarized.The subsidence of the mining ground in the coal mines in the area mainly distributed in Dahegau coal mine,Maowan coal mine,Zhuwozi coal mine,Huangnibo coal mine and Lishuwan coal mining area.4)The paper uses spatial analysis technology to explore the relationship between the ground subsidence and precipitation,stratum lithology,slope,slope direction and land occupation type of mine development in the research area.The results show that:(1)The settlement of the ground in the research area is mainly distributed near the transfer site and solid waste of the mining.Under the heavy load of ground buildings,the ground subsidence is significant.(2)Most of the subsidence areas are located in the weak mudstone and sandstone areas,which are the main rocks of the Daqiaodi formation and Baoding formation containing rich coal resourcesand are also the main concentration areas of coal mining.The weak coal bearing lithology is the main factor inducing the ground subsidence.(3)the settlement in the study area is positively related to the distribution of rainfall,and the ground settlement is especially related to strong rainfall.(4)The subsidence of the research area is mainly distributed in the slope range of 20-40 °,which is the main area that induces the ground subsidence.(5)The main body of the land subsidence in the study area is of northwest direction of the slope,and the surface settlement in the south slope and southeast direction of the slope is relatively small.Finally,the corresponding countermeasures are put forward for different causes of land subsidence.