沉降观测案例某住宅楼为5层框架结构，长30m,宽15m施工期间需对该楼进行6次沉降观测，布设沉降观测点共6个，具体位置见下图：沉降观测成果表观 测点第1次第2次第3次第4次第5次第6次沉降量（mm）沉降量（mm）沉降量（mm）沉降量（mm）沉降量（mm）沉降量（mm）本次累计本次累计本次累计本次累计本次累计本次累计10.000.002.082.082.034.111.655.760.836.590.356.9420.000.001.571.572.514.081.475.550.696.240.226.4630.000.001.831.832.554.381.615.990.636.620.206.8240.000.001.361.362.764.122.126.240.756.990.317.3050.000.001.511.512.153.661.905.560.586.140.276.4160.000.001.701.701.913.611.825.430.606.030.166.19本次沉降观测采用独立高程系统，假定基准点高程为20.00000m沉降观测顺序为 1—2—3—4—5—6—1，BM1—4。
沉降速率及沉降量计算2010.3.1基础施工完成占八、、号上期累计沉降量上期高程本期高程本期沉降量沉降速率本期累计沉降量备 注(mm)(m)(m)(mm)(mm/d)(mm)1————20.43915——————2————20.51694——————3————20.58369——————4————20.58314——————5————21.11218——————6————21.08456——————2010.3.16 一层施工完成占八、、号上期累计沉降量上期高程本期高程本期沉降量沉降速率本期累计沉降量备 注(mm)(m)(m)(mm)(mm/d)(mm)1——20.4391520.437072.080.13872.082——20.5169420.515371.570.10471.573——20.5836920.581861.830.12201.834——20.5831420.581781.360.09071.365——21.1121821.110671.510.10071.516——21.0845621.082861.700.11331.702010.3.31二层施工完成占八、、号上期累计沉降量上期高程本期高程本期沉降量沉降速率本期累计沉降量备 注(mm)(m)(m)(mm)(mm/d)(mm)12.0820.4370720.435042.030.13534.1121.5720.5153720.512862.510.16734.0831.8320.5818620.579312.550.17004.3841.3620.5817820.579022.760.18404.1251.5121.1106721.108522.150.14333.6661.721.0828621.080951.910.12733.612010.4.16三层施工完成占八、、号上期累计沉降量上期高程本期高程本期沉降量沉降速率本期累计沉降量备 注(mm)(m)(m)(mm)(mm/d)(mm)14.1120.4350420.433391.650.11005.7624.0820.5128620.511391.470.09805.5534.3820.5793120.577701.610.10735.9944.1220.5790220.576902.120.14136.2453.6621.1085221.106621.900.12675.5663.6121.0809521.079131.820.12135.432010.5.1四层施工完成占八、、号上期累计沉降量上期高程本期高程本期沉降量沉降速率本期累计沉降量备 注(mm)(m)(m)(mm)(mm/d)(mm)15.7620.4333920.432560.830.05536.5925.5520.5113920.510700.690.04606.2435.9920.577720.577070.630.04206.6246.2420.576920.576150.750.05006.9955.5621.1066221.106040.580.03876.1465.4321.0791321.078530.600.04006.032010.5.16五层施工完成占八、、号上期累计沉降量上期高程本期高程本期沉降量沉降速率本期累计沉降量备 注(mm)(m)(m)(mm)(mm/d)(mm)16.5920.4325620.432210.350.02336.9426.2420.5107020.510480.220.01476.4636.6220.5770720.576870.200.01336.8246.9920.5761520.575840.310.02077.3056.1421.1060421.105770.270.01806.4166.0321.0785321.078370.160.01076.19检测结论：从沉降观测成果表中可得，自2010年03月01日〜2010年05月16日，该楼的平均沉降量为6.69mm, 最大沉降量为4号测点7.30mm,最小沉降量为6号测点6.19mm。
最近一次平均沉降速率为0.0168mm/d, 其中最近一次最大沉降速率为1号测点，最大值0.0233mm/d。