Humidity-adjustable rock mass drilling deformation and micro-fracture test device and humidity-adjustable rock mass drilling deformation and micro-fracture test method

Abstract

The invention relates to the technical field of rock mass drill hole deformation testing, and particularly provides a humidity-adjustable rock mass drill hole deformation and micro-fracture testing device and a humidity-adjustable rock mass drill hole deformation and micro-fracture testing method. The environment box defines a containing cavity and is used for containing a rock mass model, and the inner contour of the containing cavity and the outer contour of the rock mass model are complementary in shape; the two groups of loading assemblies respectively penetrate through the environment box, are connected to two pairs of opposite transverse side surfaces of the rock mass model and apply loads to the rock mass model, and the two groups of loading assemblies are in sealing fit with the environment box; the humidity loading assembly comprises a liquid conveying pipe and a plurality of isolation components, the rock mass model is provided with a drill hole, the environment box is provided with a through hole, the liquid conveying pipe penetrates through the through hole and is inserted into the drill hole, and all the isolation components extend into the drill hole so as to carry out partition control on the drill hole loading humidity. Through the configuration, the mechanical response of the rock mass model in a complex stress environment and the analysis of the influence of the humidity-rigidity-strain coupling effect on the rock mass model are realized.

Description

Technical Field

[0001] This invention relates to the field of rock drilling testing technology, and in particular to a humidity-adjustable testing device and method for rock drilling deformation and micro-fracture. Background Technology

[0002] With the widespread application of underground engineering, ensuring the stability of these structures during long-term operation has become an urgent issue. Long-term deformation and failure monitoring and analysis are not only crucial for structural safety assessment but also provide a scientific basis for related design, construction, and operation management. Extensive research has been conducted on the mechanical properties and failure mechanisms of rock masses, and various experimental systems and analytical methods have been designed. For example, triaxial compression tests, uniaxial tensile tests, and deformation monitoring systems under different stress states have helped to comprehensively understand the mechanical properties of rock masses and reveal their deformation and failure characteristics under different external conditions. These studies provide valuable data support and theoretical guidance for the design and construction of underground engineering projects.

[0003] However, despite significant progress in the solid mechanics of rock masses, existing experimental systems and analytical methods still have limitations, particularly in the systematic study of the effects of humidity changes on the mechanical properties of rock masses. The mechanism by which periodic humidity changes affect rock masses is highly complex, not only altering their physical properties but also directly influencing their mechanical response. Under the influence of humidity changes, the pore structure and mineral composition of rock masses change, leading to decreased stiffness and increased brittleness, further inducing increased strain, and even causing crack initiation and propagation, resulting in a generalized "softening" effect and a complex humidity-stiffness-strain coupling effect. This humidity-induced stiffness and strain coupling effect is a crucial topic in current rock mechanics research, and its effects are long-term and insidious, making it difficult to accurately capture using traditional experimental methods and analytical techniques. Existing experimental setups for studying the effects of humidity on rock masses primarily involve immersing samples in a cylinder using a semi-permeable biological membrane and polyethylene glycol solutions of varying saturations, followed by loading. However, such setups can only simulate uniform humidity conditions, making it difficult to analyze the mechanical parameters of rock masses under different humidity environments, and they cannot simulate the spatial heterogeneity of humidity in underground environments. Furthermore, existing experimental setups generally only study the uniform stress characteristics of intact rock mass samples, failing to consider the complex stress characteristics of borehole rock mass models. Therefore, the results of their uniform stress characteristic studies remain insufficient for reference in underground engineering such as drilling and mining. Summary of the Invention

[0004] This invention provides a humidity-adjustable rock mass borehole deformation and micro-fracture test device and method to overcome the shortcomings of existing technologies that cannot perform composite humidity-stiffness-strain coupling effect tests on rock mass models, and realize rock mass deformation and fracture tests under dynamic local humidity changes.

[0005] According to a first aspect of the present invention, a humidity-adjustable rock drilling deformation and micro-fracture testing device is provided, comprising: Rock mass model; An environmental chamber defines a cavity for containing a rock mass model; the inner contour of the cavity is complementary to the outer contour of the rock mass model. Two sets of loading components pass through the environmental box and are connected to two pairs of opposite lateral sides of the rock mass model to apply loads. The two sets of loading components are sealed to the environmental box. The humidity loading component includes an infusion tube and several isolation components spaced apart from each other around the outer periphery of the end of the infusion tube. The rock mass model has a borehole, and the environmental chamber has a through hole. In terms of spatial layout, the humidity loading component corresponds to the borehole and the through hole, such that the infusion tube passes through the through hole and is inserted into the borehole, and all the isolation components extend into the borehole to load humidity onto at least a portion of the borehole.

[0006] The humidity-adjustable rock drilling deformation and micro-fracture testing device provided by the present invention has a sealed fit between the infusion pipe and the through hole.

[0007] According to the humidity-adjustable rock drilling deformation and micro-fracture test device provided by the present invention, the environmental chamber is connected to an external humidifier and / or an external dryer to dynamically adjust the humidity of the chamber.

[0008] According to the humidity-adjustable rock drilling deformation and micro-fracture test device provided by the present invention, the humidity loading component includes a first isolation member, a second isolation member, and a third isolation member in sequence from the end of the infusion tube toward the starting end. Each isolation member is respectively sealed with the infusion tube and the borehole. Thus, the first isolation member and the second isolation member together define the space inside the first hole, and the second isolation member and the third isolation member together define the space inside the second hole. The isolation member is a flexible rubber disc. The infusion tube located between the first and second isolation components is equipped with atomizing nozzles in sections.

[0009] According to the humidity-adjustable rock drilling deformation and micro-fracture test device provided by the present invention, the two sets of loading components include a first loading component and a second loading component, wherein the loads applied by the first loading component and the second loading component are the same or different from each other.

[0010] The humidity-adjustable rock drilling deformation and micro-fracture test device provided by the present invention has an observation window on the top surface of the environmental chamber. It also includes a digital image correlation instrument, configured to align the rock mass model through an observation window.

[0011] According to the humidity-adjustable rock drilling deformation and micro-fracture test device provided by the present invention, the borehole wall is provided with distributed optical fiber sensors, which extend along the length direction of the borehole.

[0012] According to the humidity-adjustable rock borehole deformation and micro-fracture test device provided by the present invention, a displacement sensor is provided along the radial direction of the borehole to detect the radial deformation of the borehole.

[0013] According to the humidity-adjustable rock drilling deformation and micro-fracture test device provided by the present invention, several acoustic emission sensors are set at preset positions on the surface of the rock mass model.

[0014] According to a second aspect of the present invention, a method for testing the deformation and microfracture of rock boreholes with adjustable humidity is also provided, applied to the test apparatus for testing the deformation and microfracture of rock boreholes with adjustable humidity as described in the first aspect of the present invention, comprising the following steps: Control the environment chamber to dynamically adjust the humidity of the container; The first loading component is controlled to apply a first load to the environment box and rock mass model and maintain it constant. The second loading component is controlled to apply a second load to the environmental box and the rock mass model and maintain it constant, wherein the first load is less than the second load; Activate the humidity loading component on demand to apply humidity to the boreholes of the rock mass model; Control the digital image correlation measuring instrument to detect the deformation of the rock mass model through the observation window; Control distributed fiber optic sensors and displacement sensors to detect the length direction and radial deformation of the borehole in the rock mass model; Controlled acoustic emission sensors are used to detect the generation and development of microfractures in a rock mass model.

[0015] The humidity-adjustable rock mass borehole deformation and micro-fracture test device provided by this invention uses an environmental chamber to house the rock mass model, thereby isolating the rock mass model from the atmospheric environment and constructing a humidity environment independent of the atmospheric environment for the rock mass model. By setting up two sets of loading components, different dimensions of loading load can be provided to the environmental chamber and the rock mass model, thereby simulating a more realistic underground complex stress environment. By setting up a humidity loading component, in particular, the liquid inlet of the humidity loading component is spatially aligned with the through hole of the environmental chamber and the borehole of the rock mass model, thereby dividing the borehole into multiple borehole spaces and precisely adjusting the humidity changes in different borehole spaces, simulating the influence of periodic humidity changes on the rock mass, and finally realizing the analysis of the mechanical response of the rock mass model in a complex stress environment, as well as the influence of the humidity-stiffness-strain coupling effect on the rock mass model. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a perspective view of the environmental chamber and loading components provided by the present invention.

[0018] Figure 2 This is a three-dimensional view of the rock mass model and loading components provided by the present invention.

[0019] Figure 3 This is a three-dimensional view of the rock mass model provided by the present invention.

[0020] Figure 4 This is a perspective view of the humidity loading component provided by the present invention.

[0021] Figure 5 This is a flowchart of the humidity-adjustable rock drilling deformation and micro-fracture test method provided by the present invention.

[0022] Figure label: 1. Environment Box; 2. First Loading Component; 3. Second Loading Component; 4. Rock mass model; 41. Drill hole; 42. Distributed fiber optic sensor; 43. Acoustic emission sensor; 5. Humidity loading component; 51. Infusion tube; 52. First isolation component; 53. Second isolation component; 54. Third isolation component. Detailed Implementation

[0023] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0024] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections, wherein a fixed connection can include an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0026] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0028] The following is combined with Figures 1 to 5 The present invention describes a humidity-adjustable rock drilling deformation and microfracture testing apparatus and method.

[0029] Figure 1 This is a perspective view of the environmental chamber and loading components provided by the present invention. Figure 2 This is a perspective view of the rock mass model and loading components provided by the present invention, and... Figure 1 compared to, Figure 2 The difference in the configuration shown is that environment box 1 has been removed. For example... Figures 1 to 2 As shown, the humidity-adjustable rock drilling deformation and micro-fracture test device of the present invention includes a rock model 4, an environmental chamber 1, two sets of loading components and a humidity loading component 5.

[0030] The environment chamber 1 defines a cavity for accommodating the rock mass model 4. In particular, the inner contour of the cavity is complementary to the outer contour of the rock mass model 4, such that the inner surfaces of the environment chamber 1 and the corresponding outer surfaces of the rock mass model 4 fit together.

[0031] The two loading components include a first loading component 2 and a second loading component 3. Figure 3 This is a three-dimensional view of the rock mass model provided by the present invention, such as... Figure 3 As shown, the rock mass model 4 has two pairs of oppositely facing transverse sides. A first loading assembly 2 passes through the environmental chamber 1 and connects to one pair of these oppositely facing transverse sides of the rock mass model 4, while a second loading assembly 3 passes through the environmental chamber 1 and connects to the other pair. The first loading assembly 2 and the second loading assembly 3 are sealed to the environmental chamber 1. The two sets of loading assemblies apply loads to their respective pairs of transverse sides. The first loading assembly 2 and the second loading assembly 3 can be configured as a hydraulic press or other similar components.

[0032] Figure 4 This is a perspective view of the humidity loading component provided by the present invention, as shown below. Figure 4 As shown, the humidity loading component 5 includes an infusion tube 51 and several insulating members spaced apart from each other on the outer periphery of the distal end of the infusion tube 51. Preferably, the insulating members are arranged at equal intervals along the extension direction of the infusion tube 51. The rock mass model 4 has a borehole 41, and the environmental chamber 1 has a through hole (not shown in the figure). In terms of spatial layout, the humidity loading component 5 corresponds to the borehole 41 and the through hole. The infusion tube 51 passes through the through hole and is inserted into the borehole 41, thereby the several insulating members spaced around the distal end of the infusion tube 51 also extend into the borehole 41 along with the distal end of the infusion tube 51. The humidity loading component 5 loads humidity onto at least a portion of the rock mass model 4, particularly its borehole 41, through the infusion tube 51.

[0033] With the above configuration, the humidity-adjustable rock borehole deformation and micro-fracture testing device is specifically designed to simulate the deformation and failure processes of boreholes 41 within various rock mass models 4 under various stress loading states, and can conduct experimental research under varying humidity conditions. By precisely controlling the loading state, humidity changes, and stress path, this device can comprehensively simulate the mechanical response of boreholes 41 in underground engineering under complex environments, including deformation, crack generation and propagation processes near boreholes 41. This device not only provides a new experimental platform for the study of rock mass mechanical properties, but also provides effective experimental evidence for the long-term stability assessment, design optimization, and safety monitoring of underground engineering projects.

[0034] As described above, the environmental chamber 1 contains the rock mass model 4, thereby isolating the rock mass model 4 from the atmospheric environment and creating a humidity environment independent of the atmospheric environment for the rock mass model 4. To ensure the isolation of the rock mass model 4 from the atmospheric environment, the infusion tube 51 is sealed to the through hole. Through the above configuration, even if the infusion tube 51 passes through the through hole, the sealing fit between the two still ensures the isolation of the rock mass model 4 from the atmospheric environment.

[0035] The environmental chamber 1 is connected to an external humidifier and / or an external dryer to dynamically regulate the humidity of the chamber. It should be noted that, in conjunction with the external humidifier and / or external dryer, the environmental chamber 1 regulates the overall humidity of the entire chamber, rather than the localized humidity of a specific part of the rock mass model 4.

[0036] In one embodiment, the humidity loading component 5 is a peristaltic pump, and the infusion tubing 51 is a flexible tube. The peristaltic pump delivers fluid (e.g., water) by squeezing a flexible tube, operating similarly to the peristalsis of an animal's digestive tract. Of course, in other embodiments, the humidity loading component 5 and the infusion tubing 51 may also be configured in other ways.

[0037] As described above, the humidity loading assembly 5 includes several insulating members, specifically, from the distal end of the infusion tube 51 toward the starting end, a first insulating member 52, a second insulating member 53, and a third insulating member 54. Each insulating member is constructed as a disc-shaped member, such as a flexible rubber disc, to ensure a tight seal with the inner wall of the borehole 41. Thus, regardless of whether the borehole 41 is drilled as a blind hole or a through hole, the first insulating member 52 and the second insulating member 53 enclose the portion of the borehole 41 between them into a closed first internal space; similarly, the second insulating member 53 and the third insulating member 54 enclose the portion of the borehole 41 between them into a closed second internal space.

[0038] Correspondingly, the segment of the infusion pipe 51 corresponding to the first hole space (i.e., between the first isolation member 52 and the second isolation member 53) is provided with atomizing nozzles (not shown in the figure) to atomize and spray the water supplied from the external water source into the first hole space. Conversely, the segment of the infusion pipe 51 corresponding to the second hole space (i.e., between the second isolation member 53 and the third isolation member 54) is not provided with any atomizing nozzles. At the same time, the second isolation member 53 isolates water from the first hole space, and the third isolation member 54 isolates water from the environmental chamber 1, thereby keeping the second hole space always dry, so as to compare it with the surface of the rock model 4 and the first hole space.

[0039] In particular, the main body of the infusion tubing 51 can be made of polyvinyl chloride (PVC), meaning its main body has sufficient rigidity to be inflexible; however, each segment of the infusion tubing 51 that connects to the corresponding insulating member can be made of flexible tubing as described above, meaning its connection segment is flexible. The advantage of this configuration is that the partially flexible infusion tubing 51 allows the humidity loading assembly 5 to better adapt to the extension direction of the borehole 41, and the flexible insulating member can deform accordingly with the deformation of the borehole 41 without resisting its deformation. That is, the flexible insulating member achieves a sealing fit while still allowing deformation of the borehole 41. Furthermore, the connection between the infusion tubing 51 and each insulating member is detachable, allowing for the replacement of appropriate insulating members for boreholes 41 of different sizes, or thereby adjusting the fitting position of the insulating member on the infusion tubing 51.

[0040] Preferably, the external water source supplying water to the humidity loading component 5 can also be equipped with a heater and a temperature sensor. The heater is used to heat the water to be supplied to the humidity loading component 5, and the temperature sensor is used to monitor the real-time temperature level of the heated water. With the help of the temperature feedback information from the temperature sensor, the test personnel can understand the ambient temperature that the rock mass model 4, especially its borehole 41, will face, so as to test the deformation and micro-fracture performance of the rock mass model 4 under different ambient temperatures and loading conditions.

[0041] Furthermore, a water-absorbing material, such as filter paper, is placed inside the borehole 41 and laid on the borehole wall. The humidity loading component 5, via a liquid infusion tube 51, intermittently drips water onto the water-absorbing material around and inside the borehole 41, thereby precisely regulating the humidity changes in the borehole 41 area to simulate the effect of periodic humidity changes on the rock mass model 4. Thus, through the above configuration, local humidity regulation of the borehole 41 area of ​​the rock mass model 4 is achieved.

[0042] As described above, the two sets of loading components are respectively connected to two pairs of opposite lateral sides of the environmental chamber 1 and apply loads to them. In order to realistically reproduce the mechanical properties of the rock mass in a complex underground stress environment, the first loading component 2 and the second loading component 3 are independent of each other, that is, the loads applied by the two are the same or different. This allows for precise control of the stress state and loading path of the rock mass model 4, thereby more accurately simulating the response of underground rock mass under multiaxial stress.

[0043] An observation window (not shown in the figure) is provided on the top surface of the environmental chamber 1. On the other hand, the humidity-adjustable rock borehole deformation and microfracture test apparatus also includes a Digital Image Correlation (DIC) measuring instrument, configured to be aligned with the rock mass model 4 through the observation window. The spatial arrangement of the DIC measuring instrument relative to the environmental chamber 1, the observation window, and the rock mass model 4 can be arbitrary, as long as it ensures that the DIC measuring instrument can observe the deformation of the rock mass model 4 through the observation window.

[0044] Furthermore, a distributed optical fiber sensor 42 is provided on the borehole wall of the borehole 41, extending along the length of the borehole 41. The advantage of this configuration is that the distributed optical fiber sensor 42 can be used to detect deformation of the rock mass model 4, particularly its borehole 41, along its length. Preferably, the distributed optical fiber sensor 42 is multiple, arranged at equal angular intervals along the circumference of the borehole 41 on the borehole wall.

[0045] Furthermore, a displacement sensor (not shown in the figure) is provided radially along the borehole 41 to detect radial deformation of the borehole 41. The displacement sensor can be an electromagnetic displacement meter or other suitable displacement meter, as long as it can detect the radial deformation of the borehole 41. Preferably, the displacement sensors are arranged in pairs on any radial plane of the borehole 41, and the detection paths of the two displacement sensors are orthogonal to each other. More preferably, pairs of displacement sensors are arranged on the radial planes at each depth of the borehole 41.

[0046] Furthermore, several acoustic emission (AE) sensors 43 are installed at predetermined sites on the surface of the rock mass model 4. The AE sensors 43 are sensitive to minute vibrations, thus enabling them to accurately monitor the micro-fracture process inside the rock mass model 4, thereby capturing the generation and propagation of micro-cracks. It is conceivable that the predetermined sites for the AE sensors 43 on the rock mass model 4 can be arbitrary, or determined according to factors such as the layout and size of the borehole 41.

[0047] Figure 5 This is a flowchart of the humidity-adjustable rock drilling deformation and micro-fracture test method provided by the present invention, as shown below. Figure 5 As shown, the present invention also provides a humidity-adjustable rock borehole deformation and microfracture testing method, applied to the humidity-adjustable rock borehole deformation and microfracture testing device described above. This method includes the following steps: Step S1: Control the environment chamber 1 to dynamically adjust the humidity of the cavity; Step S2: Control the first loading component 2 to apply a first load to the environment box 1 and the rock mass model 4 and maintain it unchanged; Step S3: Control the second loading component 3 to apply a second load to the environment box 1 and the rock mass model 4 and keep it constant, wherein the first load is less than the second load; Step S4: Activate the humidity loading component 5 as needed to load humidity onto the borehole 41 of the rock mass model 4; Step S5: Control the DIC measuring instrument and detect the deformation of rock mass model 4 through the observation window; Step S6: Control the distributed fiber optic sensor 42 and displacement sensor to detect the length direction and radial deformation of the borehole 41 in the rock mass model 4; Step S7: Control the AE sensor 43 to detect the generation and development of microfractures in the rock mass model 4.

[0048] First, for step S1 above, confirm that the humidity level of environmental chamber 1 has reached any preset level, and then stabilize the humidity level.

[0049] Next, for steps S2 and S3 above, the first loading component 2 is controlled to apply a first load to the environmental chamber 1 and the rock mass model 4, and the applied first load is maintained constant; the second loading component 3 is controlled to apply a second load to the environmental chamber 1 and the rock mass model 4, and the applied second load is maintained constant. The first load is less than the second load. While applying loads in both directions, the humidity level of the environmental chamber 1 remains stable.

[0050] Then, in step S4 above, the humidity loading component 5 is activated to humidify at least a portion of the borehole 41, adjusting the humidity distribution of each part of the borehole 41 to ensure precise control of humidity changes in the surrounding area of ​​the borehole 41. For example, as described above, the first borehole space within the borehole 41 is humidified by the humidity loading component 5, while the second borehole space remains dry, allowing for comparison. In this stage, the humidity level is changed according to the experimental design, for example, gradually increasing or decreasing, to simulate the stress response of underground rock mass under long-term varying humidity conditions. The humidity loading component 5 continuously performs periodic humidification operations to ensure dynamic changes in humidity in the surrounding area of ​​the borehole 41.

[0051] During humidity changes, the mechanical response of the rock mass model 4 is continuously monitored, and the deformation and micro-fracture events of borehole 41 are recorded. Specifically, in step S5, the deformation of the surface of the rock mass model 4 is continuously monitored and recorded using a DIC measuring instrument; in step S6, the axial (i.e., length direction) and radial deformation inside borehole 41 are monitored using a distributed fiber optic sensor 42 and a displacement sensor, respectively. Furthermore, in step S7, micro-fracture events are monitored and recorded in real time using an AE sensor 43, and the generation and propagation of micro-cracks are analyzed using AE signals.

[0052] After the loading and humidity change tests, the stress load was gradually reduced to simulate the pressure release process of the underground rock mass structure after long-term use. During unloading, it was necessary to maintain a stable humidity level and continue monitoring the deformation on the surface of rock mass model 4 and within borehole 41. Simultaneously, changes in the AE signal were monitored to analyze the evolution of microcracks during unloading.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A humidity-adjustable rock drilling deformation and micro-fracture testing device, characterized in that, include: Rock mass model; An environmental chamber defines a cavity for accommodating the rock mass model, the inner contour of which is complementary to the outer contour of the rock mass model; Two sets of loading components pass through the environmental chamber and are connected to two pairs of oppositely facing lateral sides of the rock mass model to apply loads. The two sets of loading components are sealed to the environmental chamber. A humidity loading component includes an infusion tube and several insulating members spaced apart from each other around the outer periphery of the distal end of the infusion tube. The rock mass model has a borehole, and the environmental chamber has a through hole. In terms of spatial layout, the humidity loading component corresponds to the borehole and the through hole, such that the infusion tube passes through the through hole and is inserted into the borehole, and all the insulating members extend into the borehole to load humidity onto at least a portion of the borehole.

2. The humidity-adjustable rock drilling deformation and micro-fracture test device according to claim 1, characterized in that, The infusion tube is sealed to the through hole.

3. The humidity-adjustable rock drilling deformation and micro-fracture testing device according to claim 2, characterized in that, The environmental chamber is connected to an external humidifier and / or an external dryer to dynamically adjust the humidity of the cavity.

4. The humidity-adjustable rock drilling deformation and micro-fracture test device according to claim 2, characterized in that, The humidity loading assembly includes a first isolation member, a second isolation member, and a third isolation member sequentially from the end of the infusion tube toward the starting end. Each isolation member is in a sealing fit with the infusion tube and the borehole, thereby the first isolation member and the second isolation member together define the space inside the first hole, and the second isolation member and the third isolation member together define the space inside the second hole; the isolation member is a flexible rubber disc. The infusion tube located between the first isolation member and the second isolation member is provided with atomizing nozzles in sections.

5. The humidity-adjustable rock drilling deformation and micro-fracture testing device according to claim 1, characterized in that, The two sets of loading components include a first loading component and a second loading component, wherein the loads applied by the first loading component and the second loading component are the same or different from each other.

6. The humidity-adjustable rock drilling deformation and micro-fracture testing device according to claim 1, characterized in that, An observation window is provided on the top surface of the environmental chamber; It also includes a digital image correlation measuring instrument, configured to be aligned with the rock mass model through the observation window.

7. The humidity-adjustable rock drilling deformation and micro-fracture test device according to claim 1, characterized in that, The borehole wall is equipped with a distributed optical fiber sensor, which extends along the length of the borehole.

8. The humidity-adjustable rock drilling deformation and micro-fracture test device according to claim 1, characterized in that, A displacement sensor is provided along the radial direction of the borehole to detect the radial deformation of the borehole.

9. The humidity-adjustable rock drilling deformation and micro-fracture testing device according to claim 1, characterized in that, Several acoustic emission sensors are installed at predetermined locations on the surface of the rock mass model.

10. A humidity-adjustable rock drilling deformation and microfracture testing method, applied to the humidity-adjustable rock drilling deformation and microfracture testing apparatus according to any one of claims 1 to 9, characterized in that, Includes the following steps: Control the environment chamber to dynamically adjust the humidity of the container; The first loading component is controlled to apply a first load to the environmental chamber and the rock mass model and maintain it constant. The second loading component is controlled to apply a second load to the environmental chamber and the rock mass model and maintain it constant, wherein the first load is less than the second load; The humidity loading component is activated on demand to load humidity onto the boreholes of the rock mass model; The digital image correlation measuring instrument is controlled to detect the deformation of the rock mass model through the observation window; Control the distributed fiber optic sensors and displacement sensors to detect the length direction and radial deformation of the boreholes in the rock mass model; The acoustic emission sensor is controlled to detect the generation and development of microfractures in the rock mass model.

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