Method for obtaining horizontal deformation amount and differential settlement amount of seams between rectangular tunnel sections

Abstract

The invention relates to a method for obtaining the horizontal deformation amount and the differential settlement amount of seams between rectangular tunnel sections. By making a first displacement meter connected to two rectangular tunnel sections in the way of being perpendicular to the seams all the time, a measuring value of the first displacement meter is the actual distance change of the tworectangular tunnel sections in the direction perpendicular to the seams, namely, the actual horizontal deformation amount of the seams. Thereby, the first displacement meter can accurately measure the horizontal deformation amount of the seams, through the further combination of a second displacement meter which is aslant connected to the two rectangular tunnel sections relative to the seams andcan be adapted to relative motion of the two rectangular tunnel sections, and according to the horizontal deformation amount of the seams and the displacement amount measured by the second displacement meter, the differential settlement amount between the two rectangular tunnel sections is obtained through a geometrical mathematical model. To sum up, through the two displacement meters, the horizontal deformation amount and the differential settlement amount of the seams can be accurately obtained simultaneously, and the overall cost is obviously lowered.

Description

technical field [0001] The invention relates to a method for obtaining the horizontal deformation and differential settlement of joints between rectangular tunnel segments. Background technique [0002] A tunnel is usually a buried underground structure formed by prefabricated assembly or cast-in-place connection of multiple sets of rectangular segments, and its interior can provide passage and transportation space for pedestrians, vehicles and pipelines. However, during the 100-year design reference period, due to the influence of factors such as uneven settlement of the foundation, long-term dynamic load, concrete shrinkage and creep, the tunnel structure will often undergo large deformations, thereby increasing the risk of major disasters in the tunnel . The joint deformation between two rectangular tunnel segments can directly reflect the deformation of the tunnel structure. Therefore, real-time monitoring of joint deformation is usually carried out in engineering to di...

AI Technical Summary

Problems solved by technology

Among them, the manual measurement error is large, the data accuracy is low, and the reference value is not great; the method of single displacement meter measurement refers to the use of a single displacement meter placed perpendicular to the joint, and the displacement meter contains universal joints, that is, the displacement meter itself can be Rotation, the two ends of the displacement gauge are respectively fixed on two adjacent rectangular tunnel segments, if the relative movement between two rectangular tunnel segments includes the relative movement parallel to the joint direction (called differential settlement), Then the displacement meter will not only expand and contract, but also rotate to adapt to the differential settlement. Therefore, the actual numerical change of the displacement meter is the displacement superposition of the differential settlement and the horizontal deformation of the joint (deformation in the direction perpendicular to the joint), which leads to displacement The accuracy of the seam horizontal deformation measured by the meter is not high

In addition, the differential settlement is usually measured using a level alone, but the level is expensive and the price is much higher than that of the displacement meter

[0004] Therefore, the existing methods have the problems of inaccurate measurement of joint horizontal deformation and high cost of differential settlement measurement. There is an urgent need for an accurate and low-cost method for obtaining joint horizontal deformation and differential settlement between rectangular tunnel segments. Quantitative method

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