Method for calculating reasonable buried depth during construction of undersea tunnel by drilling and blasting method

Abstract

The invention discloses a method for calculating a reasonable buried depth during construction of an undersea tunnel by a drilling and blasting method. The hydrogeological and engineering geological conditions of a construction site are considered comprehensively, the tunnel burial depth is calculated separately under the influence of the single factor of engineering analogy method, stability of surrounding rock, rock fracture damage, blasting loads and seismic loads, drainage design and cost and tunnel construction safety, hierarchical analysis of the importance of the factors is carried out,weight calculation of the influencing factors of the reasonable buried depth during the construction of the undersea tunnel by the drilling and blasting method is carried out by adopting a weight analysis method, and therefore, a reasonable buried depth value of the undersea tunnel constructed by the drilling and blasting method is obtained.

Description

technical field [0001] The invention relates to a method for calculating the reasonable buried depth of a subsea tunnel constructed by drilling and blasting. Background technique [0002] my country's coastline is long, and the existence of straits and bays separates the mainland from the mainland, causing great traffic obstacles, bringing a lot of inconvenience to people's travel, and also forming certain cultural differences. With the improvement of the level of human engineering construction, many ways to cross the straits and bays have gradually appeared, such as ferries, bridges and the construction of subsea tunnels. become the preferred method in the scheme. With the continuous development of the national economy, many subsea tunnels in my country are in the stage of operation or planning and construction, such as: Xiamen Xiang'an Subsea Tunnel, Qingdao Jiaozhou Bay Tunnel, Qiongzhou Strait Submarine Railway Tunnel, Dalian Urban Bay Submarine Tunnel, Bohai Bay Dalian...

AI Technical Summary

Problems solved by technology

[0004] Worldwide, since the construction of subsea tunnels in the 1930s, when determining the reasonable burial depth of subsea tunnels constructed by drilling and blasting, there has been a lack of a complete, mature and systematic calculation method to calculate and estimate the depth of subsea tunnels. Reasonable burial depth, because there are many factors that affect the reasonable burial depth of subsea tunnels constructed by drilling and blasting, including water and soil pressure, surrounding rock stability, tunnel water inflow, fracture damage, fluid-solid coupling, seawater seepage, seismic load, blasting load, geological Conditions, grouting reinforcement conditions, seawater erosion, engineering experience, foundation settlement, etc., it is difficult to comprehensively consider these influencing factors

At present, engineering analogy method is mostly used when determining the reasonable buried depth of subsea tunnels constructed by drilling and blasting method. The problems of this method are: on the one hand, due to the particularity of engineering analogy, it is difficult to determine a set of unified analogy calculation steps. This method makes the steps cumbersome, inconvenient to use, and increases the difficulty of estimation; on the other hand, the site conditions, construction methods, design overview and other factors that affect the reasonable buried depth of any subsea tunnel cannot be completely similar to the conditions of the constructed tunnel. There are differences in the main factors affecting the reasonable buried depth of tunnels, that is, the factors that affect the reasonable buried depth of tunnels have different weights, and it is difficult for the engineering analogy method to take into account the weight of each influencing factor, so the engineering analogy method directly exposes its calculation. The result has the disadvantage of error; in addition, the tunnel depth value determined by engineering analogy methods such as the experience method of submarine tunnel construction in Norway and the experience method of minimum water inflow in Japan often produces certain errors or the value is conservative

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