Method for controlling influence of rectangular pipe-jacking tunneling in shallow earthing stratum on surrounding environment

Abstract

The invention relates to a method for controlling the influence of rectangular pipe-jacking tunneling in a shallow soil covering stratum on the surrounding environment, and aims to solve the major safety risks, such as stratum upheaval and sudden change of the posture of a pipe jacking machine, existing in the jacking process of the pipe jacking machine in the shallow soil covering and even ultra-shallow soil covering stratum. According to the method, a appropriate muck modifier is determined from calculation of the jacking force and the torque of the pipe jacking machine, influences of the jacking force and the torque on the stratum, the appropriate state and the mechanical property of muck calculated based on the calculation formula of the dumping amount of the Bingham fluid and muck improvement tests, and finally, on-site monitoring is carried out, and a pipe jacking and improvement method is fed back and adjusted. According to the method, the proper state of muck improvement can be rapidly and reasonably determined based on the Bingham fluid dumping calculation formula, it is guaranteed that the pipe jacking machine reaches the good working state under the action of normal jacking force and torque, and the safety risk that the ground is broken due to unsmooth dumping and too large pressure or torque is avoided.

Description

technical field [0001] The invention relates to a method for controlling the influence of rectangular pipe jacking excavation on the shallow overlying soil layer on the surrounding environment, and belongs to the technical field of underground engineering construction. Background technique [0002] In the construction of urban roads and tunnels, there are a large number of channel construction tasks that need to cross existing roads, railways or tunnels, and subway stations need to excavate a large number of entrances and exits that pass through busy roads. The pipe jacking construction method has become an important construction method. , has been widely applied. The buried depth of these pipe jacking projects is often shallow, which is not only the advantage of pipe jacking, but also the difficulty of pipe jacking. When jacking in shallow or ultra-shallow soil, it is very easy to cause safety accidents such as excessive jacking thrust, ground uplift, and even a sudden cha...

AI Technical Summary

Problems solved by technology

There are the following problems in this shallow overburden construction: (1) The overlying soil is easily broken, resulting in the failure of the pipe jacking construction

Large-scale foundation reinforcement of the overlying soil had to be carried out to improve its strength; (2) Due to the shallow overlying soil jacking, the influence of the torque of the pipe jacking machine cutter head on the disturbance of the overlying soil cannot be ignored, and the conventional Peck settlement tank The calculation method is difficult to consider; (3) In order to save costs, the starting shaft of the pipe jacking machine is often small, which is not conducive to arranging the follow-up trolley to transport the muck, and the muck is usually transported by pipeline, which requires more requirements for muck improvement. high

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