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探讨了澳大利亚CSIRO型空心包体式钻孔三向应变计的测量技术,重点介绍了测量元件应变片的布置形式和利用围压加载试验成果修正原始解除应变实测值的方法。对解除应变实测值的修正提出了具体方法,由修正后的解除应变推算的地应力实测值更精确。在三峡工程永久船闸开挖完成后岩体应力动态变化测量中,具体分析了测量元件应变片黏贴部位和角度的误差所引起的地应力实测值的误差,具体实施了对解除应变实测值的修正,实测的岩体应力动态变化更符合工程实际情况。
This paper discusses the measurement technology of the CSIRO type hollow enveloping borehole three-way strain gage in Australia. The emphasis is placed on the layout of measuring strain gages and the method to correct the measured value of original strain relief using the results of confining pressure test. The method to correct the measured value of strain relieving is put forward. The measured value of earth stress deduced from the corrected strain is more accurate. In the measurement of dynamic change of rock mass after excavation of the permanent shiplock of the Three Gorges Project, the errors of measured values of in-situ stress caused by the error of the bonding area and angle of the measuring device were analyzed in detail. The corrected and measured dynamic changes of rock mass stress are more in line with the actual engineering conditions.