InSAR Monitoring The Impact On The Development Of Beijing Subway Land Subsidence

Land subsidence is a class of environmental geological phenomena. It focuses on the urban area, widely distributed, greatly hazardous. China is a geological disaster-prone countries, With the direct feature of Surface deformation, like land subsidence and landslides brought serious harm to the country and the people.In recent years, with the development of human social and economic, the expansion of the population, The ground subsidence increasingly frequent, The size of the settlement is also growing. The Cause of land subsidence, Human factors have greatly exceeded the natural factors, Land subsidence phenomenon is particularly serious in the densely populated city, The land subsidence is artificially geological disasters who affected by urban economic activity. China currently has96cities and regions with varying degrees of land subsidence, Urban surface, underground buildings have been varying degrees of damage because land subsidence, Serious areas even surface cracking phenomenon. So land subsidence has greatly affect of urban safety, With the Beijing Metro Rail Transit is getting more sophisticated, The large number of subway construction project started construction in Beijing. These artificially engineering will lead to ground uneven subsidence, In order to avoid unnecessary disasters, Monitoring subway construction area surface subsidence has become particularly important, and the IPTA/PSInSAR monitoring techniques and principles base on D-InSAR.Synthetic aperture radar interferometry (InSAR) is a new technology developed in1960s. D-InSAR has wide coverage, high-resolution, all-weather, all-time and other advantages, It is a great potential surface deformation monitoring technology. This paper first analyzes the techniques and principles of the D-InSAR, This technique extracts and analyzes only the phase of the point of the dot scattering, Overcome the loss of coherence and atmospheric effects limiting factor. The use of two types of settlement monitoring technology, Combined with15TerraSAR-X data for the period from April2010to February2012,Experimental study of the urban subway construction in Beijing area ground subsidence. extracted subsidence information, combined with the subway started construction time, Analysis the changes of subsidence amount. Comparison of the two methods, subsidence analysis. analysis subsidence change, analysis subsidence change, the results of monitoring subsidence reached average annual30mm/a settlement in a safe and controlled range, but the damage to the formation should also pay strict attention to avoid unnecessary disasters, prevention and treatment of the hidden dangers of city life. Not only achieve the purpose of the analysis of the multi-scale settlement of the Beijing subway construction area, also played a role of monitoring results mutual authentication...