Tempo-spatial evolution test system for rock breaking in deep and complex environment

Patent metadata

Field	Value
Publication number	US-11415557-B2
Application number	US-201916699123-A
Country	US
Kind code	B2
Filing date	Nov 29, 2019
Priority date	Nov 29, 2018
Publication date	Aug 16, 2022
Grant date	Aug 16, 2022

Abstract

A tempo-spatial evolution test system for rock breaking in deep and complex environment includes an acoustic emission sensor assembly and an acoustic emission amplifier assembly that are arranged on a rock mechanics test system. A triaxial cavity coupling bracket is arranged on an outer wall of the triaxial cavity and between two sets of acoustic emission sensor assemblies. The triaxial cavity coupling bracket includes a plate-shaped bracket, two sickle-shaped brackets, and at least three bracket bolts, which can be tightly wrapped on the outer wall of the triaxial cavity. A lateral side of the plate-shaped bracket vertically fixes two guide columns. The acoustic emission amplifier assembly is arranged between the two guide columns and is located above the plate-shaped bracket, and the acoustic emission amplifier assembly is connected to the acoustic emission sensor assembly through a signal line.

First claim

What is claimed is:

1. A tempo-spatial evolution test system for rock breaking in a deep and complex environment, comprising acoustic emission sensor assemblies and acoustic emission amplifier assemblies, wherein
the acoustic emission sensor assemblies and the acoustic emission amplifier assemblies are arranged on a rock mechanics test system;
the rock mechanics test system comprises a triaxial cavity base, a triaxial cavity mounted on the triaxial cavity base, and a triaxial cavity lifting oil cylinder fixedly mounted on a top frame of the rock mechanics test system, an output end of the triaxial cavity lifting oil cylinder is mounted with a lifting rod and a lower lifting end of the lifting rod is fixed to a top of the triaxial cavity, an upright column, a test piece indenter and an indenter base are coaxially mounted from top to bottom in an inner cavity of the triaxial cavity, the upright column is fixed to the top frame of the rock mechanics test system by a bolt, the indenter base is fixed to the triaxial cavity base, between the test piece indenter and the indenter base there is a first space for placing a test piece, and the triaxial cavity lifting oil cylinder drives the triaxial cavity through the lifting rod to move up and down along the upright column;
an outer wall of the triaxial cavity is provided with a first set of the acoustic emission sensor assemblies in positional correspondence with the test piece indenter and a second set of the acoustic emission sensor assemblies in positional correspondence with the indenter base, and a triaxial cavity coupling bracket is mounted between the first set of the acoustic emission sensor assemblies and the second set of the acoustic emission sensor assemblies;
the triaxial cavity coupling bracket comprises a plate-shaped bracket, a first sickle-shaped bracket, a second sickle-shaped bracket, a first bracket bolt, a second bracket bolt, and a third bracket bolt; the first sickle-shaped bracket and the second sickle-shaped bracket are symmetrically arranged; a first end of the first sickle-shaped bracket is directly connected to a first end of the second sickle-shaped bracket through the first bracket bolt, a second end of the first sickle-shaped bracket and a second end of the second sickle-shaped bracket extend far away from the triaxial cavity and are connected, in an approaching manner, to the plate-shaped bracket through the second bracket bolt and the third bracket bolt, and a main body of the triaxial cavity coupling bracket is annular and is tightly wrapped on the outer wall of the triaxial cavity; two sets of guide columns are mounted on a frame of the rock mechanics test system, and each acoustic emission amplifier assembly of the acoustic emission amplifier assemblies is mounted between the two sets of guide columns and is located above the plate-shaped bracket; and the each acoustic emission amplifier assembly is connected, through a first signal line, to each acoustic emission sensor assembly of the acoustic emission sensor assemblies mounted on the triaxial cavity; and
when the rock mechanics test system is in operation, the triaxial cavity moves downward to fit with the triaxial cavity base, at this moment, the each acoustic emission amplifier assembly does not contact the plate-shaped bracket; when the rock mechanics test system stops working and lifts the triaxial cavity, the triaxial cavity coupling bracket is lifted together with the triaxial cavity and the plate-shaped bracket supports the each acoustic emission amplifier assembly such that the each acoustic emission amplifier assembly is lifted.

2. The tempo-spatial evolution test system for rock breaking in the deep and complex environment according to claim 1 , wherein the each acoustic emission amplifier assembly comprises an acoustic emission amplifier and an acoustic emission amplifier placing rack, and the acoustic emission amplifier is mounted on the acoustic emission amplifier placing rack; the acoustic emission amplifier placing rack comprises a structural plate, the structural plate is internally divided into a plurality of compartments and having a frame structure, and a PVC heat insulation layer is attached to each compartment of the plurality of compartments; the each compartment is opened at the top and bottom, and the acoustic emission amplifier is exactly embedded into the each compartment and two ends of the acoustic emission amplifier are connected to a second signal line protruding from the each compartment.

3. The tempo-spatial evolution test system for rock breaking in the deep and complex environment according to claim 2 , wherein two ends of the structural plate are respectively provided with a pulley, and the two sets of guide columns are respectively provided with a guide rail or a sliding chute, the guide rail or the sliding chute allows the pulley to slide up and down linearly, and a tail end at a bottom of the guide rail or the sliding chute is higher than an upper top surface of the plate-shaped bracket, such that even though the structural plate moves to a lowest position, the acoustic emission amplifier still does not contact the plate-shaped bracket.

4. The tempo-spatial evolution test system for rock breaking in the deep and complex environment according to claim 3 , wherein a width of the pulley matches a width of the sliding chute, the pulley is stuck in the sliding chute due to a small elastic deformation formed in a transverse direction in the pulley, and at this moment, the pulley embedded into the sliding chute bears a weight of the acoustic emission amplifier placing rack and a weight of the acoustic emission amplifier without sliding freely;
alternatively, the pulleys are coaxially connected in pairs, and the two coaxially connected pulleys are spaced apart from each other to form a second space, the pulleys are stuck on two sides of the guide rail by the second space, after the two pulleys on the two sides of the guide rail undergo the small elastic deformation in the transverse direction, the two pulleys are stuck on the two sides of the guide rail to clamp the guide rail, at this moment, the two pulleys clamping the guide rail bears the weight of the acoustic emission amplifier placing rack and the weight of the acoustic emission amplifier without sliding freely.

5. The tempo-spatial evolution test system for rock breaking in the deep and complex environment according to claim 3 , wherein the each acoustic emission sensor assembly comprises a plurality of acoustic emission detection heads and a clamp fixing spring; and each of the plurality of acoustic emission detection heads comprises an acoustic emission sensor and an acoustic emission sensor clamp arranged in one to one correspondence;
the acoustic emission sensor clamp comprises a coupling screw, a clamp cover, a clamp cylinder, and a coupling panel, and the clamp cover, the clamp cylinder, and the coupling panel are threadedly connected in sequence; the clamp cover comprises a cover body provided with an internal thread, and a cover spring installed at a center of a bottom surface of an inner cavity of the cover body; two ends of a cylinder wall of the clamp cylinder are provided with an external thread, and an end of the two ends of the cylinder wall is provided with an arc-shaped notch allowing the first signal line to pass through, and three cut-through coupling holes are evenly distributed on the cylinder wall along a circumferential direction, and three coupling screws pass through the three coupling holes respectively to clamp the acoustic emission sensor in a radial direction of the clamp cylinder at a center of an inner cavity of the clamp cylinder; an upper surface of the coupling panel is flat and straight and is provided with a threaded through hole at a center of the upper surface, and a lower surface of

Assignees

• Univ Sichuan
• Univ Chengdu

Inventors

• Liu Jianfeng
• Wan Yan
• Zheng Jun
• Wang Lu
• Xue Dongjie
• Wang Chunping
• Zhang Qiangxing

Classifications

• G01N29/228

  related to high temperature conditions · CPC title

• G01N29/223

  Supports, positioning or alignment in fixed situation (mounting transducers per se G10K11/004) · CPC title

• G01N29/14 Primary

  using acoustic emission techniques {(echo of particles G01N29/046; measuring mechanical vibrations or acoustic waves in solids in general G01H1/00)} · CPC title

• G01N29/227

  related to high pressure, tension or stress conditions · CPC title

• G01N2291/0232

  Glass, ceramics, concrete or stone · CPC title