Method for calculating siltation and sudden siltation load of cross-sea immersed tunnel

Abstract

The invention discloses a method for calculating siltation and sudden siltation load of a cross-sea immersed tunnel. The method comprises the following steps: on the basis of fully investigating and surveying and collecting marine environment monitoring data of a tunnel area, performing theoretical analysis, and establishing a siltation thickness theoretical model and a calculation method under two conditions of a sand excavation open period and a sand excavation closed period according to a field test result. A deposition load calculation model is established according to back-silting characteristics of an engineering area, a layered deposition superposition model is established on the basis of deposition thickness, a tunnel deposition total load and a deposition increment load in a deposition state are established, an ocean sudden-silting geometric shape model is established according to the collapse and forming characteristics of sudden-silting substances in seawater, and a sudden silt space distribution function and a corresponding sudden silt load distribution function are established by adopting a probability density function. According to the method, the theoretical model and the calculation method of the marine environment siltation load and the catastrophe load formed by rare mutational siltation in the engineering area are established, and a practical method is provided for upper dynamic change load calculation in the operation period of the immersed tunnel.

Description

technical field [0001] The invention relates to the technical field of immersed tube tunnel engineering, in particular to a calculation method for silting and outburst loads of a cross-sea immersed tube tunnel. Background technique [0002] Due to comprehensive factors such as tidal factors, regional environmental factors (sand mining, shipping, etc.), seabed topography and landform change factors, tidal current velocity, flow direction, wave factors (shallow sea), seasonal climate changes, and sudden factors such as shipwrecks, cross-sea sinking Pipe tunnels are inevitably threatened by the periodic reciprocating action of back-silting load and the potential threat of outburst load. At the same time, due to the complexity of the formation process of silting load and its spatial and temporal distribution, the uncertainty of the occurrence of silting events, and the differences in the spatial distribution of silting loads, there is no industry-accepted and accurate and effect...

AI Technical Summary

Problems solved by technology

At the same time, due to the complexity of the formation process of silting load and its spatial and temporal distribution, the uncertainty of the occurrence of silting events, and the differences in the spatial distribution of silting loads, there is no industry-accepted and accurate and effective description of the ocean. Mechanics Model and Calculation Method of Sedimentation Load in Environmental Sedimentation Characteristics and Sediment Outburst State

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