Method for fine division of tunnel surrounding rock grade based on horizontal drilling technology

By using full-hole coring and 3D modeling in horizontal drilling technology, the problems of low accuracy and poor applicability of traditional vertical drilling methods in tunnel exploration have been solved, enabling precise classification and efficient exploration of the surrounding rock of tunnels.

CN116607934BActive Publication Date: 2026-07-07四川省地质矿产勘查开发局四0四地质队
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
四川省地质矿产勘查开发局四0四地质队
Filing Date
2023-07-05
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

In tunnel exploration in complex terrain, traditional vertical drilling methods suffer from problems such as low exploration accuracy, poor applicability, and large workload. They cannot meet the requirements for fine classification of tunnel surrounding rock, and are particularly difficult to implement in steep mountainous areas and areas with poor transportation conditions.

Method used

Horizontal drilling technology was used to collect core samples from the entire hole, and the rock core joints were statistically analyzed. Combined with the surface joint survey, a standard rock mass model of the site was established. By converting the one-dimensional borehole joint linear density to the three-dimensional volume joint number, the surrounding rock grade of the tunnel was determined, and AutoCAD three-dimensional modeling tool was used for fine division.

Benefits of technology

It accurately reflects the geological conditions of the surrounding rock along the tunnel axis, improves the accuracy and efficiency of exploration, simplifies the operation process, and meets the requirements of current exploration specifications.

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Abstract

The application provides a method for finely dividing tunnel surrounding rock grade based on horizontal drilling technology, comprising the following steps: S1, first, arranging horizontal drilling along the tunnel hole axis, carrying out full-hole coring, recording the core joints in detail according to drilling return times, and obtaining the joint line density of each return time by statistics; S2, carrying out detailed engineering geological surveying and mapping of the tunnel site area, finding out the stratum lithology, joint occurrence and development interval of the tunnel, and statistically analyzing the joints, making a joint trend, tendency and inclination rose diagram, and obtaining the dominant development direction and average development interval of the joints in the site area; S3, according to the joint development characteristics obtained in S2, using Autocad three-dimensional modeling tool to establish a standard rock mass model of the site area. The application can intuitively and accurately reflect the geological conditions and rock mass integrity of the tunnel axis surrounding rock based on the horizontal drilling technology of full-hole coring, and has high surveying accuracy.
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