Large deformation grading method combining while-drilling parameters and drilling hole test

By combining drilling parameters and borehole tests during tunnel construction, and using stress-strain measuring rods to measure rock mass strength and surrounding rock deformation, the problem of rapidly and accurately determining the large deformation level of tunnels has been solved, improving the efficiency and safety of tunnel construction.

CN122447079APending Publication Date: 2026-07-24SOUTHWEST JIAOTONG UNIV
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Patent Information

Application Number
CN202510119251.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-24
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing technologies make it difficult to quickly and accurately determine the level of large deformation in soft rock during tunnel construction, leading to increased construction difficulty and higher costs.

Method used

By combining drilling parameters and borehole test data, stress and strain are measured by driving stress-strain measuring rods into the surrounding rock of the tunnel, and the rock mass strength ratio, surrounding rock deformation and deformation rate are calculated to comprehensively determine the large deformation level of the tunnel.

Benefits of technology

It enables rapid and accurate determination of the tunnel's large deformation level, improves the efficiency and applicability of the classification, and ensures the timeliness and accuracy of construction.

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Abstract

The invention provides a large deformation grading method combining while-drilling parameters and drilling hole testing, and belongs to the field of tunnel engineering construction. The method specifically comprises the steps of obtaining engineering rock mass quality indexes; the rock mass strength of the soft rock is obtained through drilling; driving a stress-strain measuring rod into the drill hole to obtain strain data; calculating the ground stress of the soft rock according to the material parameters of the stress-strain measuring rod and the measured strain data, and obtaining the strength-stress ratio of the soft rock in front of the tunnel face; the surrounding rock deformation is calculated according to the vertical deformation of the stress-strain measuring rod, and a tunnel longitudinal deformation curve is solved through a formula, so that the final surrounding rock deformation can be calculated; continuously monitoring for a period of time, and calculating the deformation rate of the tunnel face end of the stress-strain measuring rod; and according to the strength-stress ratio, the deformation rate and the final deformation amount of the surrounding rock obtained through calculation, a soft rock tunnel large deformation grading result is comprehensively obtained. The method can conveniently and quickly classify the large deformation of the soft rock tunnel, is simple in process and accurate in result, has timeliness, and can be widely applied to engineering.
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