Introduction to tunnel advanced geological forecast?

What is tunnel advance geological prediction? At this stage, what are the regulations for advanced geological prediction of tunnels in my country? What's the basic situation? The following is the content related to the professional construction terminology of advanced geological prediction of tunnels sorted out by the editor of Zhongda Consulting. The basic situation is as follows:

The editor made inquiries through the construction industry encyclopedia website - Construction Network Construction Knowledge Column, and sorted out the advanced geological forecast of tunnels. The basic content of the relevant forecast information is as follows:

What is tunnel advance geological forecast?

Advanced geological forecasting of tunnels uses drilling and modern geophysical prospecting to detect the geological conditions in front of the rock and soil excavation faces of tunnels, tunnels, underground factories and other underground projects, and strives to grasp the rock and soil ahead before construction. The body structure, properties, status, as well as the occurrence of groundwater, gas, etc., geological stress conditions and other geological information can provide guidance for further construction to avoid water inrush, gas outburst, rock burst, large deformation, etc. during construction and operation. and other geological disasters to ensure the safety and smooth progress of construction.

The main purpose of advance geological prediction of tunnels:

Understanding the geological conditions before excavation plays a very important role in tunnel construction. Through advance forecasting, abnormal conditions can be discovered in a timely manner, and the location and occurrence of unfavorable geological bodies in front of the tunnel face, as well as the integrity of the surrounding rock structure and the possibility of water content, can be used to correctly select excavation sections, support design parameters and optimize construction. The plan provides a basis and provides timely information to prevent possible disastrous accidents such as tunnel water inrush, mud burst, gas burst, etc., allowing the engineering unit to prepare for construction in advance, ensuring construction safety, and at the same time saving a lot of money. Therefore, advance prediction of tunnels has significant social and economic benefits for safe and scientific construction, improving construction efficiency, shortening the construction cycle, avoiding accident losses, and saving investment. Advanced geological forecasting should achieve the following purposes:

1. To further clarify the engineering geology and hydrogeological conditions in front of the tunnel excavation work and guide the smooth progress of the project construction.

2. Reduce the probability and degree of harm of geological disasters.

3. Provide geological basis for optimizing engineering design.

4. Provide geological data for the preparation of completion documents.

Tunnel advance geological forecast detection content:

The contents of advance tunnel construction forecast generally include:

①Unfavorable geological forecast and disaster geological forecast: forecast in front of the tunnel Check whether there is water inrush, mud outburst, rock burst, harmful gas, etc. within a certain range, ascertain its scope, scale, and nature, and put forward construction measures or suggestions;

②Hydrogeological forecast: Forecast the inside of the cave The magnitude and changing pattern of water inrush, and its impact on environmental geology and hydrogeology are evaluated;

③Forecast of faults and their fracture zones: Forecast the location, width, occurrence, nature, The state of the filling material, whether it is a water-filled fault, and judge its stability, and propose construction countermeasures;

④ Surrounding rock category and stability prediction: Forecast the surrounding rock category and design in front of the tunnel face match, and judge its stability, and provide suggestions on modifying the design, adjusting the support type, and determining the secondary lining time at any time;

⑤ Predict the content, composition and dynamic changes of harmful gases in the tunnel;

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