Comprehensive geological prediction method for karst tunnel construction

Abstract

The invention discloses a comprehensive geological prediction method for karst tunnel construction, which includes the following steps: (1) long-distance detection; (2) geological radar detection: on the basis of the long-distance detection, adopting a geological radar to review a long-distance prediction result within a short-distance detection range; (3) adopting a horizontal protruded drill hole to carry out direct detection according to a review result; and (4) supplementary protruded blasthole detection: when a direct detection result is that a geologically abnormal body exists in the current tunneling construction area, a protruded blasthole needs to be adopted to carry out supplementary detection, and a supplementary detection result is used as supplementary detection data for the direct horizontal protruded drill hole detection result. The design of the comprehensive geological prediction method is rational, the comprehensive geological prediction method is easy and convenient to operate, and is highly operable, moreover, the mutual relation among a variety of chosen prediction methods is clear, the comprehensive detection effect is good, and the invention provides a systematic, rational and standard comprehensive prediction method for karst tunnel construction.

Description

technical field [0001] The invention relates to a geological prediction method for tunnel construction, in particular to a comprehensive geological prediction method for karst tunnel construction. Background technique [0002] The problem of karst is a major problem in tunnel engineering. The impact of karst on tunnel engineering is mainly manifested in deformation and instability around the tunnel, which often leads to local collapse, falling blocks and rockfall during tunnel excavation; It not only affects the construction safety, but also directly endangers the safety of personnel and mechanical equipment. The tunnels built in the west and southwest of my country often encounter karst problems. Karst areas are generally characterized by undulating topography, and water basins are easy to form in low-lying places. The long-term dissolution and erosion of surface water forms karst depressions or valleys of various shapes. The repeated circulation of surface water and ground...

AI Technical Summary

Problems solved by technology

However, in the actual geological forecasting, the comprehensive geological forecasting methods selected by each construction unit are different. As for which geological forecasting methods should be used at the same time in the actual construction, which forecasting method should be the main method, and which one should be selected There is no systematic, reasonable and standard construction reference basis for the relationship between various forecasting and forecasting methods.

Therefore, in actual construction, there are often many problems such as improper selection of geological prediction methods, inability to accurately and timely predict karst problems, repeated verifications, and unavoidable geological problems in the construction process due to local prediction and prediction reasons, etc. At the same time, it caused construction problems such as delays in the construction period, increased input costs, high unsafe factors, and high construction safety risks, especially for construction areas such as the Longlinguan Tunnel on the Yiwan Railway with complex geology and difficult construction. For tunnel construction, the existing comprehensive geological prediction methods cannot meet the actual construction needs.

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