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Method for evaluating stability of goaf tunnel surrounding rocks

A technology of surrounding rock stability and evaluation method, applied in the field of geotechnical investigation, can solve the problems of no clear unified method, fragmentation, and inability to obtain cores, etc.

Active Publication Date: 2017-05-10
山西省煤炭地质115勘查院
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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.

Method used

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  • Method for evaluating stability of goaf tunnel surrounding rocks
  • Method for evaluating stability of goaf tunnel surrounding rocks
  • Method for evaluating stability of goaf tunnel surrounding rocks

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Embodiment Construction

[0034] The specific embodiments of the present invention will be described below in conjunction with the accompanying drawings:

[0035] A secondary highway tunnel has a total length of 2555m, a road width of 8m, two-way lanes, and a large excavation section (about 80m 2 ). One of the first section is coal-measure strata, and the main adverse geological factors affecting the stability of the tunnel project are the coal gobs of the Jurassic Datong Formation, (No. 7, 11, and 14th coal seams) and the stratum fragmentation caused by the collapse of the gob. Therefore, in addition to the unfavorable geological factors such as landslides, landslides, water inflows, faults, karsts, etc., which are common in general tunnel construction, the unfavorable geological factors of the goaf are added, which makes the geological conditions of the work area more complicated. The difficulty of accurately evaluating the stability of surrounding rock is further increased.

[0036] In view of the...

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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 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 expressways and high-speed railways, tunnel construction plays an increasingly important role in engineering. In Shanxi, Hebei, Henan, Shandong and other coal-producing areas, it is unavoidable for tunnels to pass through the goaf of coal mines. A certain degree of landslide will occur around the goaf. In the stage of engineering investigation and design, it is of great significance to make a correct evaluation of the stability of the surrounding rock of the tunnel and understand the geological information of the surrounding rock, which has important guiding significance for the safe construction of the tunnel. In order to understand the stability of the surrounding rock of the tunnel to be excava...

Claims

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Application Information

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IPC IPC(8): G01V5/00G01N23/00
CPCG01N23/00G01N2223/1013G01V5/00
Inventor 邱卫忠张统军薛国强陈康
Owner 山西省煤炭地质115勘查院
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