The Analysis, Based On Observational Data Accuracy And Reliability Of The Soft Soil Under The Deformation

the analysis of precision and reliability for deformation observationbased on soft-ground. Deformation observation is a important section in managing the quality of a project andthe safe of building .Using the stable base plane(point) and setting up a controlling deformat-ion survey network, the result of observation can provide a basic of proper judgement of wh-ether the building is safe for its past its present and its future through earth subsidence ob-servation periodically.It is important as well for oil field project including different steps in the construction of large oil reserve tank. But because the oil field building is often located on soft ground ,we can't find a stable base point(or the base point is far from the work site). So the solutionand analysis of deformation observation data had to be acquired with other methods which are different from common method.In according with the characteristic which fit the Jinma oil extraction district of Liaohe oil-field , this paper had finished some study work as below:First ,the optimization of earth subsidence survey network which had been set up bef-ore . Aimed at the improve of survey point of its precision and reliability , the shape of su-rvey network should contain the number of restrained conditions at most; and the solution of survey network should make optimization according to the condition of geology and topographyof work site ,and the method of observation (such as select the factors of observation and po-int estimated precision), so not only the first class survey network be used in deformation ob-servation for a long time, but also can provide base point for construction and reasonable res-ult.Second, according to the characteristic of soft-ground ,when we disposed of the obser-vation data of every period from the earth subsidence network, we chose three adjustment ma-thematics models including adjustment by classics; adjustment by free network and adjustment by selecting proposal stable points to deal with the solution . Compared the result of three methods with each other, we can find out the best one which can be used as the guarantee And means of analysis and judgement of deformation result for itsreliability and precision, also according to the restrain condition between observations in the network, we can detect gross errors existed in observation data using analysis method of N(0,l) statistics to ensure the result has a real precision and reliability.Through the comparison and analysis of each scheme and combined the situation of work site, this paper proposed a scheme which can deal with the leveling network in which there are 7 restrain condition with the method of adjustment by selecting proposal stable points, it had proved that the scheme is optimistic solution and tally with the actual situation.