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工程科学与技术:2018,50(5):18-26
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基于数字化CSIRO双温补偿方法的岩体扰动应力长期监测系统的研发与应用
(北京科技大学 土木工程系, 北京 100083)
Stress Monitoring Techniques Based on the Twin Temperature Compensation Method of Digital CSIRO
(Dept. of Civil Eng.,Univ. of Sci. and Technol. Beijing,Beijing 100083,China)
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投稿时间:2018-03-16    修订日期:2018-05-25
中文摘要: 围岩应力扰动是引起工程失稳、破坏的直接因素,目前针对应力扰动的获取尚无有效手段和技术。随着深部岩体力学与开采理论研究的发展,对扰动应力监测成为深地课题需要研究的重要内容。本文利用空心包体地应力测量基本理论,提出双温度补偿技术,研发岩体扰动应力长期监测系统,并在工程现场实现对岩体扰动应力的实时监测。针对长期监测中环境温度影响过大、供电不稳、采集通道调平范围小等不足,研发了断电续采型数字化采集电路。基于空心包体地应力测量基本理论和完全温度补偿技术原理,提出采集电路的双温度补偿方法,并用该方法对采集电路进行室内标定。考虑应力监测环境特点,设计了岩体近开挖面测点应变片布片方案,并基于地应力测量原理推导了测量应变与应力的关系公式。断电续采型数字化采集电路的研发,实现了调平通道大范围量程的原位同步温度监测,克服了常规采集电路供电不稳造成的监测数据无法接续的问题,室内试验测定断电20 d数据连续性满足测量精度要求。根据室内标定数据,双温度补偿方法有效地剔除温度变化对监测系统监测精度的影响,并针对岩体边坡和地下硐室两种不同工程环境设计研发出相应的岩体扰动应力长期监测系统。现场应用显示,岩体扰动应力长期监测系统充分体现了断电续采和双温度补偿方法的优势,通过应变与应力关系式计算得出的结果显示,系统能对岩体扰动应力实现有效的监测。
Abstract:The stress disturbance of surrounding rock is the direct factor causing the instability and failure of engineering.However, at present, there are no effective methods and techniques to obtain the stress disturbance of surrounding rocks. With the development of deep rock mechanics and mining theory, disturbance stress monitoring has become an important subject. Using the basic theory of CSIRO, this study put forward the twin temperature compensation, developed the stress monitoring techniques, and realized the real-time monitoring of rock mass disturbance stress in the engineering. Considering the great temperature effect of the environment, the unstable power supply and the small collection channel adjustment in the long-term monitoring, the collection system with function of data-connection is developed when the power is cut off and reconnected. Based on the technique of CSIRO cell basic theory and the complete temperature compensation method, the twin temperature compensation method was proposed to collect and measure circuits, and to calibrate the acquisition circuit. Considering the characteristics of stress monitoring environment, the strain gauge cloth plan of the rock mass close to excavating surface was designed, and based on the in-situ stress measurement principle, the measure strain and stress relationship formula was deduced. The improved circuit adjustment is used for measuring the wide range of the measurement channel, and the high precision thermistor is applied to monitor the measured temperature. Using the function of data-connection when the power is cut off, the monitoring data of the discontinuous conventional collecting circuit is overcome, and the measured 20 days of power failure in laboratory tests meet the requirement of measuring accuracy. According to the calibrated data in laboratory, the influence of temperature on the precision of monitoring system is effectively eliminated by the twin temperature compensation method. Aiming at the rock slope and underground chamber, different rock mass disturbance stress long-term monitoring systems are designed and developed. Field application test displays that, the rock mass disturbance stress long-term monitoring system fully reflects the advantages of power cut and twin temperature compensation. The results calculated by the relationship between strain and stress shows that the system can effectively monitor the rock mass disturbance stress.
文章编号:201800291     中图分类号:TU459    文献标志码:
基金项目:国家重点研发计划资助项目(2016YFC0600703)
作者简介:李远(1980-),男,副教授.研究方向:岩土工程.E-mail:liyuan@ustb.edu.cn
引用文本:
李远,刘子斌,乔兰,付双双,王茜,吴世兵.基于数字化CSIRO双温补偿方法的岩体扰动应力长期监测系统的研发与应用[J].工程科学与技术,2018,50(5):18-26.
LI Yuan,LIU Zibin,QIAO Lan,FU Shuangshuang,WANG Qian,WU Shibing.Stress Monitoring Techniques Based on the Twin Temperature Compensation Method of Digital CSIRO[J].Advanced Engineering Sciences,2018,50(5):18-26.