Underwater tunnel shield construction excavation face stability evaluation method, system and equipment

Abstract

The invention provides an underwater tunnel shield construction excavation face stability evaluation method, system and equipment, and the method comprises the steps: determining an excavation face stability evaluation index based on a shield construction excavation face instability mechanism; dividing the stability of the excavation surface into a plurality of grades, establishing each grade space, and determining the quantitative interval of each evaluation index in each grade; calculating a combined weight of each stability evaluation index by adopting a combined weighting method, and taking the combined weight as a judgment basis of the influence of the evaluation indexes on an evaluation result; and constructing an ideal point evaluation function by adopting an ideal point method so as to represent the membership degree of the to-be-evaluated object to each grade, calculating the grade membership degree of the to-be-evaluated section in each grade of the evaluation system, and determining the stability grade of the excavation surface in the construction process of the evaluation section.

Description

technical field [0001] The disclosure belongs to the field of tunnel shield construction, and relates to a method, system and equipment for evaluating the stability of an excavation surface of an underwater tunnel shield construction. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] Due to its small impact on the surrounding environment, the shield construction technology has become the main method for the construction of urban subway tunnels in soft soil areas. The study of the mechanical behavior during the construction process of the shield method has important engineering application value. Among them, the stability of the excavation surface has always been the most important issue in shield tunneling construction. Keeping the stability of the excavation surface basically guarantees the safe and smooth construction of the shield tunnel...

AI Technical Summary

Problems solved by technology

Maintaining the stability of the excavation surface during shield excavation is the key to ensuring construction safety. Once the excavation surface is unstable, it will cause excessive deformation of the soil or even collapse, resulting in a series of serious consequences such as damage to surrounding buildings.

Large-diameter shield tunnels are faced with complex hydrogeology, and the excavation plan is difficult to implement, and it is prone to safety accidents such as the instability of the excavation surface and the head of the shield machine

At present, there are few researches on shield machines crossing water-rich formations and fault fracture zones at home and abroad. The research content is not comprehensive enough, the mechanism research is not deep enough, the understanding is not clear enough, and there is a lack of scientific and reliable risk prediction, prevention and control of the instability and damage of the excavation surface. theory

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