Modeling method for realizing structural mechanical performance of pipe segment three-dimensional loading

Abstract

The invention discloses a modeling method for realizing structural mechanical performance of pipe segment three-dimensional loading. The modeling method mainly includes: analyzing and remodeling geological conditions; making a stratum model; making a contraction rule pipe segment model; designing a pipe segment monitoring system; performing different loading model experiments on pipe segments; collecting and analyzing data. By adopting the method, pipe segment structural mechanical characteristic experiments on working conditions of horizontal and vertical different loading, of pipe segment rings, pipe segment axial geostress difference and pipe segment staggering and eccentric loading in different geological environments can be realized, real simulation of pipe segment loading environment is realized through stratum remodeling, pipe segment structure is processed by utilizing gypsum to realize detailed construction of the pipe segment structure, joint screwed connection is realized, annular and longitudinal strain gauges are distributed for whole-ring pipe segments to realize monitoring of internal force of the pipe segments, and technical support is provided for subsequent shield pipe segment assembling and wall posterior grouting parameter setting.

Description

technical field [0001] The invention relates to tunnel projects such as urban subways and highway tunnels that adopt shield construction segment structure lining, and specifically relates to a modeling method for analyzing structural mechanical properties of segments in a three-dimensional loaded environment. Background technique [0002] In recent years, with the development of the economy and the advancement of technology, shield tunnels have been widely used in urban subways, highway tunnels, and cross-river and sea tunnels. The shield tunnel segment lining structure is a tunnel body formed by splicing the segments into a ring through the segment joints, and then connecting the single segment rings into a tubular structure through the inter-ring joints. The segment is in a three-dimensional loaded environment and is the main support structure of the shield tunnel. However, due to the existence of segment joints, the tunnel is prone to problems such as misalignment, openin...

AI Technical Summary

Problems solved by technology

However, even if the scientific research results are remarkable, the structural design is still difficult to adopt, and the safety of the structure is still ensured with a high safety factor, resulting in waste of materials

One of the important reasons is that only the segment is selected as the test object in the general indoor test of segment stress, and the ground stress is equivalent to the load applied to the segment. The mechanical model is too simplified, resulting in an overly ideal stress environment for the segment.

At the same time, the means of on-site monitoring are only aimed at the characteristic geological conditions, and cannot obtain the limit boundary conditions

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