【正文】 706214822126615977171018018112391191222100201311352014195201528820附表3 ********麗都A4樓各期觀測(cè)沉降速度各期沉降速度A401(mm/天)A402(mm/天A403(mm/天）A404(mm/天A405(mm/天）A406(mm/天)A407(mm/天)A408(mm/天)天數(shù)建筑狀態(tài)100000000052136318949105311610137091484159111710318111119120920133520146020159320 觀測(cè)點(diǎn)的標(biāo)志The precision and frequency of settlement observation is discussedAbstractWith the deepening reform of economic system, people39。s living standards, more and more high quality of life, the per capita higher request living area are improving。 Together with the population increase and the large increase, land mines and greater precious. Especially densely populated cities, in limited land, people have to to the air development。 So skyscraper swiftly. For example: Beijing, Shanghai, guangzhou, shenzhen and other cities, in recent years, built a large number of buildings, some as high as the correlation between 300m, it39。s a real people use only space a good solution. As highrise buildings and the rapid development of modern workshop, people will face a must solve the problem the settlement of buildings. Because the settlements of building deformation how, directly related to the safety of the building use, especially in highrise buildings. So for the safety of the building use, in building construction, operation and management of the need for building during settlement observational, guarantee construction engineering quality and safety production, but also for future building structure and foundation reasonable design, accumulating material. Keywords: settlement observation settlement observation accuracy Settlement observational precision The accuracy of settlement observation determines both the quality and the settlement observational results obtained therefrom the building safety state, they also involve the authenticity of the conclusion to the observation options that observation technology development。 No matter for the design of measuring personnel or building and management personnel are all very important. At present, our country engineering measurement specifications (GB5002693) regulation: all levels of deformation observation elevation error and vertical displacement monitoring network. . the corresponding class wait for accuracy quite plus or minus mm for + mm, second, third for + mm, four etc. for + mm This regulation is more general, cannot pletely suitable for according to the specific circumstances of buildings to determine the specific observation accuracy and correct response to validate the design of the building39。s settlement process and the optimization design of accumulated research material needs. And all kinds of material proposed specific observation accuracy and have respective discrepancy, see literature [1], [3], etc. The building deformation measurement procedures the regulation: relative settlement, local foundation settlement and expansive soil foundation deformation, etc, all the observation error shall not be more than allow deformation value 1/20 . Because the main threat buildings safe foundation is uneven subsidence caused by building oblique or cut down. If only as a reflection is not much more than a deformation numerical and ensure that allowed word of the safety of the building, I think the deformation by allowing the 1/20 is possible. But, for highrise buildings, the great, the settlement is due to load also is pared monly big, especially in soft soil area, the final settlement will reach the amount some penetrated even decades cm. But because of its stiffness is very big, settlement of general parison even, of the whole subsidence, little effects on buildings, so the code for design of building foundation (GBJ789) on the value of highrise buildings without foundation settlement, formulate specific provisions. Some professional technical standards even made specific provision, its value is also very wide, such as Shanghai provisions in highrise building plinth subsidence is normal 35cm within. If settlement is according to allow the 1/20 calculation results of observation accuracy, plus or minus 7mm, below the normal level measuring accuracy, apparently don39。t fit right. Also, because building subsidence is not uniform, and each settlement points at the same time that the settlement is posed of changing with time is not a linear function curve, if you want to reflect the settlements of building process, according to our country engineering measurement unit experience, I think the accuracy of settlement observation by the settlement is the biggest difference between observational error for different subsidence of the largest amount of 1/10 allows values for good [5]. For example: some factory automation production line equipment requirements related to the biggest difference between settlement points for the settlement is limit 10mm, that is to say, in different subsidence is less than 10mm, permitted to continue production。 The settlement is reached when differences 10mm, production equipment must be timely inspect, adjust, otherwise will have the accident may. This is because of differential settlement amount is due to appear subsidence caused by the inhomogeneity of the. We know the difference, foundation settlement direct role in building the upper structure, if settlement is too big, can lead to differen