摘要
位移监测是保障深基坑施工安全的重要措施之一.针对常规基坑位移监测方法存在的问题与不足,开发了无接触、遥控、高精度和高可靠性的激光位移实时监测系统.系统借鉴激光准直测量原理,采用半导体激光器提供基准激光束、光纤-光敏管阵列实现光电转换、单片机数字电路进行数据采集和预处理、数字信号经调制解调器进入监控计算机,最终由计算机实时绘制位移-时间曲线.根据位移-时间曲线评价基坑的稳定性.实用中的监测系统的监测精度为0.5 mm,监测仪的最大位移量程为96 mm,激光器的有效射程为100 m.
Displacement monitoring is one of the important measures to insure the construction safety of deep foundation pits. With regard to the problems and weaknesses of the traditional soil displacement monitoring system for foundation pit, a new remote monitoring system has been developed based on the principle of collimation measure. Semiconductor laser is used as its datum line. Its photoelectric transformation is realized by the matrix of light fiber and photodiodes. Single chip microcomputer is used to collect and preprocess the data. Digital signals get into the monitoring computer through a modem. Finally the displacement-time curve can be drawn on the computer. By means of the curve, the stability of the foundation pit can be evaluated. The precision of the system in use is 0. 5 mm. The measure scope of the displacement monitor is 96 mm. The effective shot region of the laser is 100 m.
出处
《西安建筑科技大学学报（自然科学版）》
CSCD
北大核心
2006年第2期194-198,共5页
Journal of Xi'an University of Architecture & Technology(Natural Science Edition)
关键词
深基坑
施工
位移
监测系统
deep foundation pit
construction
instant displacement
monitoring system
