Shield tunnel segment joint disease condition analysis method

Abstract

The invention discloses a shield tunnel segment joint disease condition analysis method, and belongs to the field of detection analysis, and the method comprises the steps of: acquiring the circle center coordinates of a reference segment and the circle center coordinates of adjacent segments; substituting the circle center coordinates into a shield tunnel joint disease analysis model to obtain slab staggering quantity, a joint included angle, coordinates of an intersection point J and an azimuth angle at a reference segment joint; determining the deformation condition of the segment joint; judging whether a damage condition exists or not according to the overlapping relation between the segment joint included angle and the intersection point J and the inner and outer diameter end points of the two segments; and determining the minimum joint damage area and the maximum joint damage area at the joint of the two segments according to the distance relationship between the intersection J and the inner and outer diameter end points of the two segments. The method does not depend on external sensing equipment, does not damage the segment, is beneficial to deployment, has the advantages of high analysis speed and accurate calculation result, and can analyze the shield tunnel segment joint disease condition in real time.

Description

technical field [0001] The invention relates to the technical field of shield tunnel joint detection and analysis, in particular to a method for analyzing the disease condition of shield tunnel segment joints. Background technique [0002] The joint of the shield tunnel is the weak link of the shield tunnel, and the joint structural disease (joint deformation and joint damage, joint deformation including segment misalignment and joint angle) is the main component of the structural deformation of the shield tunnel, and also affects the shield tunnel. An important factor in the waterproof performance of tunnels. Therefore, the damage index of the shield tunnel joint is of great significance to the health assessment of the shield tunnel structure and the maintenance of the tunnel structure. [0003] However, in the existing technology, it is difficult to obtain the structural damage of the tunnel joint, mainly due to four reasons: (1) one side of the tunnel structure is in con...

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Problems solved by technology

The disadvantages of this type of scheme mainly include: (1) It is necessary to install instruments or equipment on the tunnel structure, ①Installing instruments or equipment will cause secondary damage to the tunnel structure; ②Affected by the equipment and environment in the tunnel, some joint clips There may not be space for installing instruments and related auxiliary equipment in the corner area; ③In the face of tens of millions of tunnel joints, it is impossible to install a large number of instruments and equipment, and there is also a problem of high cost

(2) The engineering applicability and timeliness are poor. ① Due to the harsh environment in the tunnel and the durability of the instrument, the performance of the installed instrument or sensor will be degraded or damaged within a certain period of time, resulting in the above method being only suitable for a certain period of the tunnel’s life. 1. Applied in a short period of time; ② It needs to pre-embed instruments and equipment, which can only be used in the early stage of tunnel construction. It is not easy to install later instruments and equipment in the tunnel that has been in service during the operation period; (3) Only joint defects facing the tunnel space can be obtained index, it is difficult to obtain the tunnel disease index on the facing surface

This type of scheme requires all-round scanning of the tunnel structure to obtain a huge amount of point clouds. It is necessary to obtain the arc length through a fitting method and calculate the opening. The point cloud of some parts of the tunnel structure cannot be obtained; (2) The internal environment of the tunnel is harsh, and the discrete type of the obtained point cloud is poor, which will cause large errors in the calculation results; (3) The amount of obtained point cloud is huge and requires complex processing The process and the efficiency of obtaining indicators are low; (4) only the angle opening value towards the inner space of the tunnel can be obtained

The outer boundary conditions of the tunnel affected by the complex and changeable operating environment are dynamically changing, and it is difficult to obtain

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