CN-122016462-A - Rock drilling deformation and micro-fracture test device and method with adjustable humidity

CN122016462ACN 122016462 ACN122016462 ACN 122016462ACN-122016462-A

Abstract

The invention relates to the technical field of rock drilling deformation test, in particular to a rock drilling deformation and micro-fracture test device and method with adjustable humidity, wherein the test device comprises a rock model; the device comprises an environment box, two groups of loading components, a humidity loading component and a humidity loading component, wherein the environment box is used for containing a rock mass model, the inner contour of the environment box is complementary with the outer contour of the rock mass model, the two groups of loading components penetrate through the environment box and are connected to two pairs of mutually opposite transverse sides of the rock mass model and apply loads to the two pairs of mutually opposite transverse sides of the rock mass model, the two groups of loading components are in sealing fit with the environment box, the humidity loading component comprises a perfusion tube and a plurality of isolation components, a drill hole is formed in the rock mass model, the environment box is provided with a through hole, the perfusion tube penetrates through the through hole and is inserted into the drill hole, and all the isolation components extend into the drill hole to carry out partition control on loading humidity of the drill hole. By the configuration, analysis of mechanical response of the rock mass model in a complex stress environment and influence of humidity-rigidity-strain coupling effect on the rock mass model is achieved.

Inventors

ZHAO CHENXI
ZHONG SHENG
GAO FUQIANG
DONG SHUANGYONG
PENG XIANGYUAN
WU RUI
WANG XIAOQING
WANG SHOUGUANG
ZHONG LIQUN
WANG WANJIE

Assignees

中煤科工开采研究院有限公司

Dates

Publication Date: 20260512
Application Date: 20260108

Claims (10)

1. A rock mass drilling deformation and micro-fracture test device with adjustable humidity is characterized by comprising: A rock mass model; an environmental chamber defining a cavity for receiving the rock mass model, the internal contour of the cavity being complementary in shape to the external contour of the rock mass model; Two sets of loading assemblies respectively passing through the environmental chamber and connected to and applying load to two pairs of mutually facing lateral sides of the rock mass model, the two sets of loading assemblies being sealingly engaged with the environmental chamber; Humidity loading assembly, including transfer line and a plurality of isolation member of mutually spaced cover locating transfer line tip periphery, the drilling has been seted up to the rock mass model, the through-hole has been seted up to the environment case, on spatial layout, humidity loading assembly with the drilling reaches the through-hole corresponds, makes the transfer line passes the through-hole and inserts the drilling, and all isolation member stretches into in the drilling, in order to right at least some loading humidity of drilling.
2. The humidity adjustable rock mass drilling deformation and micro-fracture testing apparatus of claim 1, wherein the infusion tube is sealingly engaged with the through-hole.
3. The humidity adjustable rock mass drilling deformation and micro-fracture testing apparatus of claim 2, wherein the environmental chamber is connected with an external humidifier and/or an external dryer to dynamically adjust the humidity of the chamber.
4. The humidity adjustable rock mass borehole deformation and micro-fracture testing apparatus of claim 2, wherein the humidity loading assembly comprises a first isolation member, a second isolation member and a third isolation member in sequence from the distal end of the infusion tube toward the initial end, each of the isolation members being sealingly engaged with the infusion tube and the borehole, whereby the first and second isolation members together define a first in-hole space and the second and third isolation members together define a second in-hole space; The infusion tube section between the first isolation member and the second isolation member is provided with an atomizing nozzle.
5. The humidity adjustable rock mass drilling deformation and micro-fracture testing apparatus of claim 1, wherein the two sets of loading assemblies comprise a first loading assembly and a second loading assembly, the loads applied by the first loading assembly and the second loading assembly being the same or different from each other.
6. The humidity adjustable rock mass drilling deformation and micro-fracture testing device according to claim 1, wherein a top surface of the environmental chamber is provided with an observation window; a digital image correlation gauge is also included, configured to align the rock mass model through the viewing window.
7. The humidity adjustable rock mass drilling deformation and micro-fracture testing device according to claim 1, wherein the wall of the drill hole is provided with a distributed optical fiber sensor, and the distributed optical fiber sensor extends along the length direction of the drill hole.
8. The humidity adjustable rock mass drilling deformation and micro-fracture testing apparatus according to claim 1, wherein the drilling is provided with a displacement sensor along its radial direction for detecting the radial deformation of the drilling.
9. The humidity adjustable rock mass drilling deformation and micro-fracture testing apparatus according to claim 1, wherein a plurality of acoustic emission sensors are provided at preset points on the surface of the rock mass model.
10. A humidity-adjustable rock drilling deformation and micro-fracture test method applied to the humidity-adjustable rock drilling deformation and micro-fracture test device according to any one of claims 1 to 9, characterized by comprising the following steps: controlling an environment box to dynamically adjust the humidity of the accommodating cavity; Controlling a first loading assembly to apply a first load to the environmental chamber and the rock mass model and maintain the first load unchanged; controlling a second loading assembly to apply a second load to the environmental chamber and the rock mass model and to remain unchanged, wherein the first load is less than the second load; Starting a humidity loading assembly as required to load humidity to the drill holes of the rock mass model; controlling a digital image correlation measuring instrument, and detecting deformation of the rock mass model through an observation window; Controlling a distributed optical fiber sensor and a displacement sensor, and detecting the length direction and radial deformation of a drilling hole of the rock mass model; And controlling an acoustic emission sensor to detect generation and development of micro-cracks of the rock mass model.

Description

Rock drilling deformation and micro-fracture test device and method with adjustable humidity Technical Field The invention relates to the technical field of rock drilling tests, in particular to a humidity-adjustable rock drilling deformation and micro-fracture test device and method. Background With the wide application of underground engineering, ensuring the stability of these structures in long-term operation is a subject to be solved. The long-term deformation and damage monitoring and analysis not only has important significance for the safety evaluation of the structure, but also provides scientific basis for related design, construction and operation management. Extensive researches on the aspects of mechanical properties, destruction mechanism and the like of rock mass have been carried out, and various experimental systems and analysis means are designed. For example, triaxial compression experiments, uniaxial tension experiments, deformation monitoring systems under different stress states and the like of a rock mass are helpful to fully understand the mechanical performance of the rock mass, and the deformation and damage characteristics of the rock mass under different external conditions are revealed. These studies provide valuable data support and theoretical guidance for the design and construction of underground works. However, despite the remarkable progress of the existing research results in the aspect of solid mechanics of rock mass, the existing experimental systems and analysis means still have certain limitations, and in particular, the system research on the performance of humidity change on the mechanical properties of rock mass is not yet enough. The periodic variation of humidity has a very complex mechanism of action on the rock mass, which not only causes the physical properties of the rock mass to change, but also directly affects the mechanical response of the rock mass. Under the action of humidity change, the pore structure and mineral composition of the rock body change, so that the rigidity of the rock body is reduced, the brittleness is increased, the strain is further induced to be increased, even the crack is initiated and expanded, the generalized softening effect of the rock body is generated, and the complex humidity-rigidity-strain coupling effect is generated. The coupling effect of rigidity change and strain caused by humidity is an important subject in the current rock mass mechanics research, and the influence of the coupling effect has long-term property and concealment property and is difficult to accurately capture through a traditional experimental method and analysis means. The existing experimental device for the influence of humidity on the rock mass mainly uses a biological semipermeable membrane and polyethylene glycol solutions with different saturation to soak a sample in a cylinder body and load the sample, but the experimental device can only simulate uniform humidity conditions, is difficult to analyze mechanical parameters of the rock mass in different humidity environments, and cannot simulate the spatial heterogeneity of humidity in the underground environment. Moreover, the existing experimental device is generally only researched on the uniform stress characteristics of the complete rock mass sample, the complex stress characteristics of the drilling rock mass model are not considered yet, and the research result of the uniform stress characteristics is still insufficient in reference significance of underground engineering such as drilling and mining. Disclosure of Invention The invention provides a humidity-adjustable rock drilling deformation and micro-fracture test device and method, which are used for solving the defect that a rock model cannot be subjected to a composite humidity-rigidity-strain coupling effect test in the prior art and realizing the rock deformation and fracture test under the condition of dynamic local humidity change. According to a first aspect of the present invention, there is provided a humidity-adjustable rock mass drilling deformation and micro-fracture testing apparatus comprising: A rock mass model; The environment box is used for limiting a containing cavity and is used for containing the rock mass model, and the inner contour of the containing cavity is complementary with the outer contour of the rock mass model; Two sets of loading assemblies respectively passing through the environmental chamber and connected to and applying load to two pairs of mutually facing lateral sides of the rock mass model, the two sets of loading assemblies being in sealing engagement with the environmental chamber; Humidity loading assembly, including transfer line and a plurality of isolation members of locating transfer line tip periphery with interval each other, the drilling has been seted up to the rock mass model, and the through-hole has been seted up to the environment case, on spatial layout, humidity loading assembly c