A section optimization method for pipe jacking tunnel

Abstract

The invention provides a pipe-jacking tunnel section optimization method. The pipe-jacking tunnel section optimization method comprises the following steps: firstly, pre-tunnelling is performed to enable an excavated tunnel to naturally deform, and the actual crown settlement value of a soil layer is monitored and taken as reference for follow-up judgment; crown settlement in the section shape which is the same as the excavated tunnel is calculated according to given parameters of the soil layer, the calculated value and the actual measurement value are compared, the given parameters of the soil layer conforms to the reality if the calculated value and the actual measurement value are consistent, and on the basis, inversion calculation of the overexcavation range is performed; different overexcavation section shapes are designed, crown settlements corresponding to the different overexcavation section shapes are searched repeatedly till the situation that the soil layer subjected to crown settlement is exactly right in contact with the top of a pipe-jacking pipeline without an additional clamping force, and the corresponding section subjected to overexcavation is taken as the optimal section; and crown settlements are continually monitored, the parameters of the soil layer are continually modified, and the appropriate overexcavation section shape is continually selected in the tunnelling process to ensure favorable gaps on the left and right and above pipe jacking to remove the up-and-down clamping function of the soil layer.

Description

technical field [0001] The invention relates to a section optimization method of a pipe jacking tunnel, belonging to the technical field of pipe jacking construction engineering. Background technique [0002] In conventional pipe jacking construction, the front cutter head rotates and cuts the soil layer to form a tunnel, and the pipe is continuously jacked afterwards. Since the tunnel section naturally deforms and becomes wider left and right but narrower up and down, it will form a clamping effect on the pipe in the up and down direction , increasing the jacking resistance, which is not conducive to jacking operations. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for optimizing the section of a pipe jacking tunnel, which can effectively eliminate the up and down clamping effect on the pipe after the tunnel is deformed. [0004] The technical solution adopted to realize the o...

AI Technical Summary

Problems solved by technology

[0002] In conventional pipe jacking construction, the front cutter head rotates and cuts the soil layer to form a tunnel, and the pipe is continuously jacked afterwards. Since the tunnel section naturally deforms and becomes wider left and right but narrower up and down, it will form a clamping effect on the pipe in the up and down direction , increasing the jacking resistance, which is not conducive to jacking operations

Images