深孔空心包体法地应力测量仪及其应用实例

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Abstract The structure of the deep borehole hollow inclusion strain gauge geostress measuring instrument and its assistive tools are described，which were used for deep borehole geostress measurement；and an example is given. Traditional instrument based on stress-releasing theory is only applied to shallow borehole，not applied to deep borehole. The traditional instrument is improved，and a deep borehole hollow inclusion strain gauge geostress measuring instrument is developed. It integrates hollow inclusion strain gauge，strain recording apparatus and electronic compass into a micro-probe，which can be installed at predesigned position in the borehole when measuring the geostress. Geostress data of Zhangjiang observation borehole in Shanghai at the depth of 365 and 385 m underground by using this technology is obtained. The results show that the maximum principal stress direction in surveying area is near EW direction；and the values of the maximum principal stresses are between 8.5 MPa and 9.0 MPa. The minimum principal stress direction is near vertical；and the values of the minimum principal stresses are near equal to the overburden pressure. Measurement results show that deep borehole hollow inclusion strain gauge geostress measuring instrument is suitable for deep hole of 3D geostress measurement.

Key words： rock mechanics stress relief hollow inclusion deep borehole 3D geostress measurements observation borehole

Received: 11 July 2012

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/I5/902

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