Tunnel hole wall secondary stress recovery test method and device
By using an integrated combined strain gauge and saddle-shaped pad in the secondary stress recovery test of the tunnel wall, and by incorporating the effects of confining pressure and lithology, the influence of confining pressure and lithology on the measurement results in the existing technology was resolved, and high-precision secondary stress measurement was achieved.
CN116952421BActive Publication Date: 2026-07-21CHENGDU UNIVERSITY OF TECHNOLOGY +2
Patent Information
- Application Number
- CN202310941643.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-07-28
- Publication Date
- 2026-07-21
- Estimated Expiration
- 2043-07-28
Smart Images
Figure CN116952421B_ABST
Abstract
The application discloses a tunnel hole wall secondary stress recovery test method and device, and relates to the technical field of tunnel construction surveying.The method is that firstly, an integrated combined strain gauge containing strain gauges in 0° direction, 45° direction, 90° direction and-45° direction and the like is pasted on the end surface of a rock core; secondly, initial strain values in each direction are measured and recorded; thirdly, the rock core is placed between upper and lower saddle-shaped cushion blocks, and the rock core is subjected to secondary stress recovery test in each direction; finally, the 0° direction and the 90° direction are divided into a group, the-45° direction and the 45° direction are divided into another group, the stress values recovered by two perpendicular directions in each group are regarded as confining pressures, and the final secondary stress measurement result is corrected in combination with the known mapping relationship between the confining pressures and the confining pressure influence coefficient, so that the measurement precision of the secondary stress of the hole wall surrounding rock can be greatly improved without using regional tectonic stress for estimation.
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Citation Information
Patent Citations
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