Shed frame test method in pilot tunnel digging technology

Abstract

The invention relates to the field of engineering construction, and provides a shed frame test method in a pilot tunnel digging technology. The method comprises the following steps that: test device building: a flattop shed frame is supported and fixed, a prefabricated bracket is supported and fixed below the flattop shed frame, and a pressure-bearing, height-regulation and force measurement device is arranged between the flattop shed frame and the prefabricated bracket, wherein the pressure-bearing, height-regulation and force measurement device has the functions of pressure bearing, height regulation and multidirectional force measurement; a loading process: the flattop shed frame loads preset pressure, meanwhile, the pressure-bearing, height-regulation and force measurement device provides supporting force, initial supporting force and pressure borne by the flattop shed frame are the same and have opposite directions; and unloading and regulation: supporting force provided by the pressure-bearing, height-regulation and force measurement device on a target position is regulated according to a surrounding rock load releasing rule. The invention provides the shed frame test methodin the pilot tunnel digging technology, the stress deformation state of the shed frame under surrounding rock pressure in different digging technologies and digging stages can be accurately obtained for guiding the structural design and the remediation repair of the shed frame, and construction cost is effectively reduced.

Description

technical field [0001] The invention relates to the field of engineering construction, in particular to a scaffold test method in a pilot tunnel excavation process. Background technique [0002] With the rapid development of my country's infrastructure construction, a large number of tunnels have been excavated, and the geological conditions encountered in the process of tunnel excavation have become increasingly complex, and the overall tunnels have shown a development trend of "many, long, large, and deep". During the excavation of the tunnel, the underground structure is damaged, and the underground structure has the problems of hidden damage and difficult repair. Therefore, in the process of underground construction, it is necessary to do a good job of supporting work, but the requirement for supporting strength is high, and the construction cost will increase accordingly. Therefore, in order to ensure the strength of the support and reduce the construction cost, it is n...

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Problems solved by technology

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art or related technologies: the damage caused by the impact of the surrounding rock pressure on the scaffold during the excavation of the pilot tunnel cannot be predicted, which affects the support stability of the scaffold to the pilot tunnel

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