| There is a lot of mineral resources in Zibo,Coal,Iron,Aluminum and other mineral resources mining caused some underground goaf,prone to induce goaf collapse.At present,land subsidence has become one of the main geologic disasters of Zibo,which affects people's production and living safety.Therefore,it is necessary to monitor the ground subsidence of Zibo,determine the main settlement area,settlement level and settlement range,and find the factors that cause ground subsidence,and it is essential for the prevention and treatment of Zibo ground subsidence and urban development.Based on the data of 25 Alos PALSAR SLC from October 3,2007 to February 26,2011,this paper uses D-InSAR technology,PS-InSAR Technology and SBAS-InSAR technology to monitor the land subsidence of Zibo.Firstly,the ground subsidence in 6different time periods of Zhangdian district and Zhoucun region were monitored by D-InSAR technology,and the level of ground subsidence in two counties was qualitatively analyzed.Then the Zibo continuous ground vertical deformation field was monitored by using ps-insar technology and Sbas-insar technology.The level of ground subsidence in the whole study area was quantitatively analyzed.The results of extraction of the ground deformation field in Zhangdian District and Zhoucun area by D-InSAR technology can be found that the eastern and southern regions of Zhangdian region and the central and southern regions of the Zhoucun district have a large settlement,and it is preliminarily concluded that the settlement occurred in the mining of mineral resources.The monitoring results of Zibo ground subsidence by PS-InSAR technology and SBAS-InSAR technology show that the results obtained by the two methods are consistent,and the surface subsidence in Zibo is common,and there are obvious regional characteristics.The settlement rate of around 85.3%in the study area is Within 10mm/yr,there are four major settlement areas,about 324.315km~2,mainly in the northeast and southwest of Zhangdian District,Zhoucun District,north of Boshan District,central and north-west of Zichuan District,and 14.7%of the total area of the study area.Through transverse profile analysis,kriging interpolation and isoline analysis,it is found that there are several settlement centers in four key settlement areas,and the settlement level decreases gradually along the settlement center.Through the analysis of time series,it is found that the maximum settlement point of Zibo is located in northwestern Zichuan District Mining area during20071003—20110226,the settlement rate can reach 182mm/yr and the settlement is584mm.PS-InSAR and SBAS-InSAR were able to obtain better monitoring results in urban areas,but there were fewer PS points in higher altitude and larger terrain.The monitoring results obtained by the two methods are compared with the SDCORS monitoring results of the same period,which proves that the monitoring accuracy of this experiment is millimeter.The experiment combines the D-InSAR technology,PS-InSAR Technology and SBAS-InSAR technology organically,carries on the qualitative analysis and the quantification to the Zibo ground subsidence condition,can obtain the Zibo linear deformation field,also can obtain the Zibo non-linear deformation field,obtains the more perfect ground subsidence monitoring result.Through the comparison and analysis between the field survey and the Zibo Mine geological environment influence distribution map,it is found that the distribution of settlement area is consistent with the distribution of Zibo mining area,and it is in the prone area of Zibo goaf subsidence,it is proved that the ground subsidence of Zibo is mainly caused by mineral resources exploitation.The research in this paper is of significance to the spatial distribution characteristics of Zibo ground subsidence,the process of evolution over time and the formation factors of ground subsidence,which can provide some technical support for Zibo ground subsidence control and geological disaster management in mining area. |
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