Large-size rectangular jacking pipe jacking force estimation method based on displacement control

Abstract

The invention relates to a large-size rectangular jacking pipe jacking force estimation method based on displacement control. The method comprises the following steps of 1, establishing a soil layer-rectangular jacking pipe numerical analysis model by using the numerical analysis software Abaqus; 2, applying a given jacking distance and grouting pressure scheme to the rectangular jacking pipe according to the established numerical analysis model; 3, obtaining different jacking forces according to different jacking distances and grouting pressure schemes, and drawing a fitting curve of the jacking forces along with the change of the jacking distances under different grouting pressure schemes; and 4, repeating the step 2 and the step 3 to obtain different fitting curves, comparing the fitting curves with an empirical formula and measured data to obtain an optimal fitting curve and a jacking force fitting function, and estimating the jacking force, wherein the fitting function can serve as a jacking pipe jacking force calculation general formula with the same design parameters and construction conditions. According to the method, the jacking force can be estimated easily instead of atime-consuming trial-and-error method, and the jacking force estimation method can better adapt to various pipeline and soil body contact conditions.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering, in particular to a method for estimating the jacking force of a large-size rectangular pipe jacking based on displacement control. Background technique [0002] Pipe jacking construction is to use the jacking force generated by the jacking equipment to overcome the friction between the pipeline and the surrounding soil in the working pit, and push the pipeline into the soil according to the designed slope. After one section of pipe has been jacked into the soil layer, the second section of pipe section continues to be jacked, and so on, and the pipe is buried between the two pits. During the pipe jacking construction process, the jacking force is the most critical parameter in the entire pipe jacking project. With the continuous excavation of the pipe jacking machine, all the pipes need to rely on the jacking force to be pushed into the soil, and the jacking force is transmitted betwee...

AI Technical Summary

Problems solved by technology

In the numerical simulation of engineering mechanical behavior, the stress control method is usually used. Due to the uncertainty of the empirical calculation formula and the theoretical calculation formula, the estimation result of the jacking force is uncertain. If the jacking force is too large, the structure of the pipe section will be damaged, and if the jacking force is too small will lead to jacking failure

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