A Method for Tunnel Geological Karst Risk Assessment Based on Fuzzy Judgment

Abstract

The invention discloses a tunnel geological karst risk evaluation method based on fuzzy judgment. Karst cave water burst evaluation standard and risk rating are quantified. The method mainly comprises the following steps: (1) carrying out tunnel geological survey to obtain formation lithology information of a tunnel and surrounding rock nearby the tunnel; (2) if lithology is soluble rock types comprising limestone, dolomites, gypsum salts or soluble conglomerate rock or is positioned nearby an insoluble rock contact zones and the water level is lower than underground water level and is higher than karst development lower limit, then evaluating the tunnel geological karst risk as high risk; (3) acquiring hydrogeological information of the tunnel and the surrounding rock nearby the tunnel, establishing an index hierarchy table, and calculating a risk grade value according to the index hierarchy table and fuzzy mathematics; and (4) determining the karst cave water burst grade according to the risk grade value. The karst cave water burst evaluation standard and the risk rating are quantified, and are visible; and the degree of the influence factor can be clearly judged according to scores.

Description

technical field [0001] The invention relates to tunnel engineering technology, in particular to a tunnel geological karst risk assessment method based on fuzzy judgment. Background technique [0002] In my country's engineering construction, due to the influence of terrain conditions, highways and railway lines often use tunnel schemes to cross mountains, and large hydropower stations often have long diversion tunnels and traffic auxiliary tunnels. A large number of "long and deep buried" tunnels have become mountainous areas Control engineering of engineering construction. However, tunnels need to penetrate complex geological conditions such as mountains and rivers, so various unexpected geological disasters, especially karst geological disasters, are often encountered during the construction process. The occurrence of karst geological disasters poses a great threat to the safety of personnel and machinery, and causes great economic losses. Therefore, in the process of tun...

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Problems solved by technology

However, it is very difficult to evaluate these uncertain influencing factors. Some studies have also analyzed and evaluated a single factor. It is particularly important to establish a set of evaluation methods that consider multiple influencing factors.

[0005] (2) At present, there is no relatively mature risk assessment method for tunnel karst geological hazards in the existing regulations, but in the actual risk assessment of tunnel karst geological hazards, some uncertain factors such as rock weathering degree and integrity are mostly described qualitatively, so It is very inconvenient in actual operation, and the influence of this factor cannot be described intuitively. In addition, this qualitative description is not conducive to computer programming, and it is very inconvenient when forming an intelligent risk assessment system

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