Surface stress reliving device for excavation face of underground cavern

Abstract

The invention discloses a surface stress reliving device for an excavation face of an underground cavern. The surface stress reliving device comprises an outer shell, a stress reliving cutting mechanism, a multi-path strain measuring device, a measuring control unit, and a three-component rectangular strain rosette arranged on a working wall surface, wherein the stress reliving cutting mechanism is arranged in the outer shell and is respectively connected with the multi-path strain measuring device and the measuring control unit, the multi-path strain measuring device is connected with the three-component rectangular strain rosette through a connecting lead wire so as to record change of strain on a working face in a stress releasing process of the stress reliving cutting mechanism on a rock wall, and is connected with a main control box through a communication cable, and the measuring control unit is connected with a computer through a power cable. The surface stress reliving device, provided by the invention, is reasonable in design, the outer shell adopts a hand-held box-type structure, and is small in size, light in weight, and simple and easy to assemble and disassemble, and the surface stress reliving device has the characteristics of convenience for carry in the field, good adaptability and the like.

Description

technical field [0001] The invention relates to a device for measuring the surface stress of a rock mass in the field of rock engineering, in particular to a device for releasing the surface stress of an excavation surface of an underground cavern. Background technique [0002] In geotechnical engineering fields involving excavation and construction of underground caverns, such as water conservancy and hydropower, mining, etc., it is often necessary to understand and determine the stress state of the surrounding rock on the surface of the cavern to evaluate the stability of the excavated surrounding rock itself, or to identify and predict the roof In order to take necessary engineering measures in time to prevent accidents. Especially in the construction of deep underground caverns, due to the high level of ground stress, accidents such as rockbursts on the excavation surface of the cavern due to the high ground stress environment during the construction period occur from ti...

AI Technical Summary

Problems solved by technology

This device is mainly used to drill and cut relatively complete rock samples on the vertical deep hole wall, and can also complete the stress relief of the local wall surface of the hole wall, but it cannot obtain real-time deformation data of the relieved local wall surface on the hole wall; The structure of the device is complex, which is not suitable for the actual needs of quickly measuring the plane stress of the excavation surface of underground caverns

In addition, in rock surface stress measurement technology, traditional multi-channel strain gauges are often used to measure rock strain, which often requires special configuration of strain measurement instruments, which will inevitably affect the relatively complex underground cavern construction site. adverse effect on work

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