Bidirectional static and dynamic loading roof key block caving test device and method

Abstract

The invention discloses a bidirectional static and dynamic loading roof key block caving test device and method, and the device comprises an overall frame, a lateral pressure loading system, a vertical pressure loading system, a lateral pendulum bob impact disturbance system, a vertical drop-hammer impact disturbance system, an incident wave monitoring system and a response measurement system. Thetesting method comprises the steps: a first work condition: carrying out the bidirectional static and dynamic loading disturbance testing of a tunnel overall model sample to explore the initial stress state of the surrounding rocks of a tunnel and the initial stress condition of a key block rock, and observing an overall phenomena of the propagation law of cracks, a forming process of a key blockand the instability of the key block in the disturbance process; a second work condition: carrying out the bidirectional static and dynamic loading disturbance instability testing of a key block model sample, taking the result under the first work condition as the basis, abstracting the key block and the surrounding rocks at two sides to more precisely explore the law that a stress wave causes the propagation of cracks, a critical condition that the key block slides in an instable manner, and an action mechanism that the disturbance effect causes the instability.

Description

technical field [0001] The invention belongs to the technical field of early warning of mine disasters, and relates to a test device and method for a key block of a top plate with bidirectional static and dynamic loading. Background technique [0002] Roof caving is a common mine disaster. The roof caving in the stope is generally caused by the excessively large exposed area of ​​the goaf or the broken roof strata, and most of them are large-scale overall caving. For roadways with poor support conditions, accidents of individual rock blocks falling often occur, which belong to partial caving. Whether it is a large-scale overall caving or a small-scale local caving, the instability of the roof rock is often caused by the instability of key blocks. Due to the fall of the key block, the static equilibrium state of the entire rock formation is broken, and other rock blocks will undergo a similar domino-style chain fall reaction, resulting in accidents that injure / kill personne...

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Problems solved by technology

At present, the research work on mine caving hazards is mostly focused on the upper limit analysis of caving arches, the law of roof periodic pressure and reasonable support methods, while the two-way static-dynamic combined test and related devices for the stability research of key blocks of the roof Haven't seen relevant reports yet

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