An active drilling and testing device and method suitable for testing the shear wave velocity of soil outside a tunnel
By using an active drilling and testing device, and utilizing the grouting holes on the tunnel segments as drilling channels, combined with a vacuum negative pressure slag removal structure, in-situ testing of the shear wave velocity of the soil outside the tunnel is achieved. This solves the problems of large soil disturbance and large test result errors in existing technologies, and improves the accuracy and coverage of test data.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- GUANGZHOU METRO DESIGN & RES INST CO LTD
- Filing Date
- 2026-04-10
- Publication Date
- 2026-07-17
AI Technical Summary
Existing tunnel outer soil shear wave velocity testing technology causes significant soil disturbance, results in large errors, cannot effectively identify wave velocity changes in the reinforcement layer behind the tunnel segments, and cannot meet the actual testing needs of engineering sites.
An active drilling and testing device is adopted, including a drilling device, a drilling force application system, a drilling slag removal system, a wave velocity testing system, and a data acquisition and control system. The existing grouting holes on the tunnel segments are used as drilling channels. After enlarging the holes, the drilling device is penetrated into the soil outside the tunnel. Combined with the vacuum negative pressure slag removal structure of the drilling slag removal system, in-situ testing of shear wave velocity is achieved.
It effectively avoids damage to the tunnel structure caused by secondary hole breakage, reduces soil disturbance, improves the accuracy of test data, and can test soil at different depths behind the segments, covering the reinforcement layer within the tunnel burial depth range. It is suitable for scenarios with high environmental requirements, such as operational subway tunnels.
Smart Images
Figure CN122407075A_ABST