Monitoring and Analysis of Ground Subsidence of East China

Ground subsidence is classified into artificial and natural ground subsidence.The natural ground subsidence is a normal phenomenon, which is caused by gravity.Generally the development of natural ground subsidence is rather slow, and its subsidence level is 1mm~2mm per year.Artificial ground subsidence is a geologic disaster, and its inducement is the excessive exploitation of underground liquids (groundwater, petroleum and natural gas etc.) and the subsidence of ground empty areas from mining.In addition, the subsidence of karst is an important factor causing ground subsidence (of course, the non-human factor).People's awareness and research on ground subsidence trace roughly to the 1920s, and people still have various opinions and understandings on the matter of ground subsidence.The rules and exact inducement of ground subsidence is a very complex scientific subject, and people conceive many misunderstandings and ambiguous recognition.With the help of Precision Level Monitoring technology and GPS technology, tens of year's Field Monitoring, the article brings forth the opinion that ground subsidence is recoverable to a certain extent, and concludes the scope of the subsidence threshold value of ground subsidence recoverability based on the systematic analysis on Field Monitoring data.It depicts the proper method and monitoring essentials of the Field Monitoring on ground subsidence.