针对保水开采相似模拟岩层大范围非线性位移特点和大量程高精度测量要求,提出了一种通过布设参考点提高位移测量精度的方法,并通过实验进行了分析验证。研究结果表明:测量精度随参考点个数及位移值的增加而提高;参考点个数增加可以减小系统误差,系统误差随着参考点个数的增加在一定范围内波动,测量值误差的正负决定波动趋势;当参考点个数大于15时,误差均值向有序过渡,大于25时,表现为有序状态;为保证测量精度,至少需要对25个参考点。本方法可为保水开采覆岩移动变形模拟观测提供借鉴。

Considering the wide-range and nonlinear characteristics of strata movement and the demand between large range and high precision in the physical simulation of water-preserved mining,a method for improving displace- ment measurement precision in physical modeling has been proved by experiments. The results show that the meas- urement accuracy is improved as the number of reference points and displacements increase. The increase of the number of reference points could reduce the system error which fluctuates in a range depending on the number of ref- erence points and the fluctuation ascribes to the plus or minus of error. The mean error starts to reduce and diminish significantly when the number of reference points is 15 and 25 respectively. Therefore,at least 25 reference points are required to ensure the required precision. The method suggests a way for measuring strata movement in mining physical models.