A modeling method to realize the structural mechanical properties of three-dimensional loaded segments

Abstract

The invention discloses a modeling method for realizing the three-dimensional loaded structural performance of a segment, which mainly includes geological condition analysis and remodeling, stratum model making, scaled segment model making, segment monitoring system design, and different segments Realization of loaded model experiments, data collection and analysis, etc. Using this method, it is possible to realize the structural mechanical properties experiments of segment rings in different geological environments under different loads in the horizontal and vertical directions, differences in the axial stress of the segment, segment staggering and eccentric loading, and stratum remodeling. Realize the real simulation of the segment loading environment, the segment structure is made of gypsum, the detailed structure of the segment structure is realized, the joint spiral connection is realized, and the ring and longitudinal strain gauges are arranged on the entire ring segment to monitor the internal force of the segment. Technical support will be provided for subsequent shield segment assembly and post-wall 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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