Tunnel advance geology forecast method based on blast hole drilling information

A technology for advanced geological prediction and blasting, which is applied in the seismology and seismic signal processing for logging records, and can solve the problems of time-consuming, inability to fully reflect the surrounding rock conditions in front, and occupation of construction face.

Active Publication Date: 2013-09-18
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

Drilling methods such as advanced horizontal drilling take a long time, are too expensive, and occupy the construction face, which seriously affects the

Method used

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  • Tunnel advance geology forecast method based on blast hole drilling information
  • Tunnel advance geology forecast method based on blast hole drilling information
  • Tunnel advance geology forecast method based on blast hole drilling information

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Embodiment 1

[0082] The present invention is described in further detail below in conjunction with accompanying drawing:

[0083] A method for advanced geological prediction of tunnels based on blasthole drilling information, comprising the following steps:

[0084] 1. A standard database of drillability index should be established before the forecast implementation [K i ], the steps are:

[0085] Firstly, the drillability index database of typical surrounding rock grades is established [K i ]' (i=Ⅰ, Ⅱ, Ⅲ, Ⅳ, Ⅴ, respectively denote Ⅰ, Ⅱ, Ⅲ, Ⅳ, Ⅴ surrounding rocks, the same below). By performing n blasthole drilling in the i-level surrounding rock and obtaining the drilling information, the The drillability index K is calculated by the formula i1 ', K i2 ', K i3 '...K in ', so as to obtain the drillability index database [K i ]'.

[0086] Drillability index database for i-level surrounding rock [K i ]' in the data K i1 ', K i2 ', K i3 '...K in ', data screening is carried out...

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Abstract

The invention discloses a tunnel advance geology forecast method based on blast hole drilling information. The method comprises the following steps of A, establishing a standard database [Ki] of drillability indexes before the implementation of forecast; and B, implementing advance geology forecast by the following specific steps of: (1) numbering advance blast holes on a tunnel face; (2) recording acquired drilling rate v, drilling pressure p, drilling rod rotating speed w, rock slag, return water amount and return water color one by one; (3) calculating the drillability index K of each group of parameters according to a drillability index formula (7); (4) comparing the calculated drillability index k with [Ki], if K belongs to (min[Ki], max[Ki]), the basic surrounding rock grade of a drilling segment is grade i; (5) comprehensively judging the surrounding rock grade in combination with rock slag ingredients, water return condition and the surrounding rock condition of the tunnel face according to a table 2; (6) comparing and verifying in combination with a forecasted surrounding rock grade and a practical surrounding rock grade determined after tunnel excavation; and (7) expanding corrected data into [Ki]. The method is convenient to operate, is low in cost, is accurate and efficient, and can be used for performing real-time advance geology forecast.

Description

technical field [0001] The present invention relates to the field of advanced geological prediction, more specifically to a method for advanced geological prediction of tunnels, in particular to an advanced geological prediction for predicting the geological conditions of the surrounding rock in front of the face of a tunnel excavated by drilling and blasting method based on blasthole drilling information method. It is suitable for advanced geological prediction of tunnels excavated by drill and blast method in hydropower, transportation and mining industries, and can also be used for lithology detection of slopes and foundations. Background technique [0002] With the rapid development of engineering construction in my country's hydropower, transportation, mining and other industries, more and more tunnels (roads, railways, subways, etc.), tunnels, roadways and other underground caverns are built in rock formations with complex geological environments. Due to the concealme...

Claims

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Application Information

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IPC IPC(8): G01V1/40G01V1/28
Inventor 王浩田湖南焦玉勇覃卫民张国华张秀丽
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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