In order to resolve the precision and stability problems of calibration system during scientific measurement process,a control system of high-precision one-dimensional calibration device is designed based on microcomputer At89s52.In general,the device,which comprises a microcomputer,a step motor,an actuator and ball screws,is used for automatic measurement for micro-distance variation and positional calibration.In details,the step motor is driven by microcomputer to move the platform through ball screws,whereas the resolution can be controlled by system device.As such,the control process is realized by microcomputer for problem-solving on control system design,due that the device can be calibrated by gauge blocks towards 10micrometer in precision.Compared with large-scale high-precision measurement instruments,this device possesses such advantages as low cost and good human-computer interface.Further studied,higher intelligent data input can be obtained using computer communication technology.In application for settlement monitoring,this device can be used for settlement simulation to assess experiments.

Based on the observed data of chamber earth pressure from on-site construction of earth pressure balance shield, a time series of chamber earth pressure is created and handled by singular spectrum analysis method, including singular spectrum decomposition and reconstruction, and a subsequent forecasting of the time series is performed based on the linear recurrence relations model. It is turned out that singular spectrum analysis can effectively separate principal components from time series of chamber earth pressure, especially in the extraction of weak periodic components. In addition, it is available for singular spectrum analysis method to reduce noise jamming by filtering out a part of the original time series that is supposed to be noise rather than signal. Consequently, it is reasonable to make the forecasting more accurate and smooth by applying singular spectrum analysis method to the analysis of chamber earth pressure values, which would be helpful to the future predictive control of chamber earth pressure in earth pressure balance shield.

介绍了地铁盾构施工中测量注浆量的一种新方法.使用该方法设计了相应的测量装置,并应用于实际的盾构施工过程中.通过对盾构施工采集的实时数据进行分析和处理,计算出实时注浆量.经过与实际注浆量对比验证,可知这种注浆量测量方法精度要比传统测量方法精度高.