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为满足地应力精确测量和长期监测的技术发展要求,基于空心包体应变计地应力测量技术,通过对采集电路稳定性、完全温度补偿技术数字化及复杂环境下装备适应性进行研究,开发出具有瞬时采集、断电续采功能的前端数字化采集系统。基于温度自补偿技术及双温度补偿设计实现完全温度补偿技术在前端数字化型空心包体应变计地应力测量中的应用。室内标定试验和现场测试数据显示,双温度补偿技术对原温度补偿算法数据的修正量达到15%。采用围压率定法和真三维地应力试验台进行模拟现场条件的室内测试,结果显示数据真实反映空间应力变化。在3组现场地应力测量中,应变数据真实反映解除过程的岩芯缺陷、构造扰动、温度变化影响及解除应力演化过程,双温度影响修正应变值分别为64,86με。在温度强扰动条件下,通过双温度补偿算法修正,数据稳定性仍然达到了30 min内数据波动幅度小于5με的标准。双温度补偿算法的瞬接续采型前端数字化空心包体应变计地应力测量技术在室内试验和现场测试中均表现了良好的测试精度和采集系统稳定性。
In order to meet the technical requirements of accurate measurement of geo-stress and long-term monitoring, based on the measurement technology of hollow inclusion strain gage in-situ stress, by studying the stability of acquisition circuit, digitization of complete temperature compensation technology and equipment adaptability in complex environment, Instantaneous acquisition, power failure continued mining front-end digital acquisition system. Application of Complete Temperature Compensation Technology Based on Temperature Self - compensation Technology and Dual Temperature Compensation Design in Ground Stress Measurement of Front - end Digital Hollow Body Strain Gage. Indoor calibration test and field test data show that the dual temperature compensation technology to the original temperature compensation algorithm data correction of 15%. The confining pressure rate determination method and the true three-dimensional in-situ stress test rig were used to simulate the field conditions of the indoor test. The results show that the data truly reflect the spatial stress changes. In the three groups of on-site stress measurements, the strain data truly reflect the core defects, structural disturbances, temperature changes and stress-relief processes during the release process. The corrected strain values of the two temperature effects are respectively 64,86με. Under the conditions of strong temperature perturbation, the data stability is still up to the standard of less than 5με within 30 min through the double temperature compensation algorithm. The dual-temperature compensation algorithm of instantaneous continuous mining type front-end digital hollow body strain gauge measurement of in-situ stress in laboratory tests and field tests showed a good test accuracy and acquisition system stability.