A Method for Stability Evaluation of Surrounding Rock of Tunnel Crossing Goaf

Abstract

The invention discloses a method for evaluating the stability of goaf tunnel surrounding rocks, and belongs to the technical field of geotechnical investigation methods. The method provided by the invention employs the geophysical prospecting data for evaluating the stability of the goaf-crossing tunnel surrounding rocks. The method comprises the following steps: 1, determining the relation between apparent density and the wave velocity of surrounding rocks; 2, measuring the value of apparent density; 3, determining the wave velocity value of the surrounding rocks; 4, carrying out the determining of the stability of the surrounding rocks. The method provided by the invention employs the geophysical prospecting means of density log and wave velocity testing reasonably and effectively, achieves the reliable evaluation of the stability of the surrounding rocks through the parameter of apparent density and the wave velocity of surrounding rocks, and finally guarantees the safe and high-efficiency tunnel construction process.

Description

technical field [0001] The invention specifically relates to a method for evaluating the stability of the surrounding rock of a tunnel passing through a goaf, and belongs to the technical field of geotechnical survey methods. Background technique [0002] With the rapid development of highways and high-speed railways, the role of tunnel construction in engineering is becoming increasingly important. In coal-producing areas such as Shanxi, Hebei, Henan, and Shandong, it is inevitable for tunnels to pass through coal mine goafs. In many cases, A certain degree of landslides will occur around the goaf. In the stage of engineering survey and design, it is of great guiding significance for the safe construction of tunnels to make a correct evaluation of the stability of the surrounding rock of the tunnel and to understand the geological information of the surrounding rock. In order to understand the stability of the surrounding rock of the tunnel to be excavated, in accordance w...

AI Technical Summary

Problems solved by technology

However, after the surrounding rocks around the goaf collapsed, they were relatively broken, and a complete core could not be obtained, so it was difficult to accurately and quantitatively evaluate the stability of the tunnel surrounding rocks.

For the quantitative evaluation of the surrounding rock stability of tunnels passing through goafs and other special geological conditions, there is currently no clear and unified method at home and abroad.

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