Divided Water-bearing Zones And Compressible Zones Of Beijing Land Subsidence Area And Land Subsidence Automatic Monitoring System

According to investigation of comprehensive basic geology in the land subsidence area of Beijing and land subsidence survey, the paper preliminarily expresses hydrogeology, engineering geological condition and land subsidence current distributed situation of land subsidence area. At present surface subsidence range expand year by year, the whole district take place area of the surface subsidence up to 2815km2, the subsiding amount 722mm most greatly totally. According to the changing characteristics, such as range , area , subsiding amount and speed of subsiding of surface subsidence area of different periods, Beijing land subsidence evolution was divided into three stages, taking shape, developing and expanding stage. Through typical drilling and various kinds of hydrogeology of surface subsidence area, testing the achievement materials geotechnologically, compress to moisture rock group , the paper compartmentalize Beijing surface subsidence area layers of group for the first time. The stratum was divided into three layers of different moisture rock groups and compress one layer of groups separately in the subsiding area. The paper has obtained the hydrogeological parameters of some strata , physics mechanics nature , soil mechanics parameter, analyse and research development and change mechanism and risk factors of the surface subsidence ; And according to the extent of injury of the surface subsidence , draw a circle to approve the endangering area , medium-sized endangering area , endangering area slightly strongly of surface subsidence tentatively. On this basis, people set up bedrock monitoring well with extensometer and layer monitoring well with extensometer ,water table peephole , hole water pressure strength peephole , install automatic monitoring equipments and data gathering and dealing with the devices , set up land subsidence database, which offer technical support for the fact that set up the mathematics model of land subsidence and land subsidence prewarning to predict systematically.