Experimental device and method for detecting the crack initiation time of a fractured body model

Abstract

The present invention discloses an experimental device and method for detecting the initiation time of a cracked body model, relating to the technical field of test and measurement. The device includes a liquid supply tank, a connecting pipe, and a pressure detection device. One end of the connecting pipe is communicated with the liquid supply tank, and the other end of the connecting pipe is used for sealing connection and communication with the water injection hole of the cracked body model. The liquid supply tank is used to supply pressurized liquid for the experiment of the cracked body model into the connecting pipe. The pressure detection device is vertically arranged on the connecting pipe, and the pressure detection device can detect the pressure data of the liquid in the connecting pipe. The initiation time of the microcracks of the cracked body model can be simply obtained through the change of the pressure data detected by the pressure detection device. Moreover, the whole device has a simple structure and does not require additional auxiliary equipment, so the cost is relatively low.

Description

Technical Field

[0001] The present invention relates to the technical field of experimental testing, and particularly relates to an experimental device and method for detecting the crack initiation time of a fractured body model. Background Art

[0002] Underground rock mass engineering is often in a complex geological environment. Many engineering disasters related to groundwater are caused by the change of the external environment of the seepage field induced by underground excavation behavior, which promotes the splitting and expansion of cracks in the rock mass, and then triggers geological disasters.

[0003] The development of microcracks in a fractured body means that the bearing capacity of the component reaches the limit, and the durability will also decrease significantly with the appearance of microcracks. In order to obtain the development characteristics of microcracks inside the load-bearing component and the law of the crack initiation strength of the component's microcracks, scientific and technological workers have made various attempts, and used technologies such as acoustic emission signal positioning, CT scanning, and photographic imaging to determine the crack initiation time and corresponding strength of the microcracks in the fractured body. The equipment is complex, and the cost of the above-mentioned auxiliary equipment is not low, and the test environment is even more crowded. Summary of the Invention

[0004] The purpose of the present invention is to provide an experimental device and method for detecting the crack initiation time of a fractured body model, so as to solve the problems existing in the above-mentioned prior art, make the device simple, low-cost, and be able to simply obtain the crack initiation time of the microcracks in the fractured body model.

[0005] To achieve the above purpose, the present invention provides the following solutions:

[0006] The present invention provides an experimental device for detecting the crack initiation time of a fractured body model, including a liquid supply tank, a connecting pipe, and a pressure detection device. One end of the connecting pipe is communicated with the liquid supply tank, and the other end of the connecting pipe is used for sealing connection and communication with the water injection hole of the fractured body model. The liquid supply tank is used to supply pressurized liquid for the experiment of the fractured body model into the connecting pipe. The pressure detection device is vertically arranged on the connecting pipe, and the pressure detection device can detect the pressure data of the liquid in the connecting pipe.

[0007] Preferably, a T-shaped three-way valve is arranged on the connecting pipe. Two interfaces on the T-shaped three-way valve are used for connection with the connecting pipe, and the remaining one interface on the T-shaped three-way valve is used for installing the pressure detection device.

[0008] Preferably, a switch valve is further arranged on the connecting pipe, and the switch valve is used to control the flow and disconnection of the liquid in the connecting pipe.

[0009] Preferably, it further includes a base which has an internal cavity with an inlet and an outlet. The inlet is communicated with the connecting pipe. The fissure body model can be fixedly arranged on the base and the outlet is used for sealing connection and communication with the water injection port of the fissure body model.

[0010] Preferably, the liquid supply tank contains the liquid for the experiment of the fissure body model, and an air inlet for communicating with the injection of high-pressure gas is arranged at the top of the liquid supply tank.

[0011] Preferably, the switching valve is a straight-through valve.

[0012] The present invention also provides a method for identifying the initiation time of microcracks in a fissure body model based on any one of the above, including the following steps:

[0013] Step 1: Connect one end of the connecting pipe to the water injection hole of the fissure body model.

[0014] Step 2: The liquid supply tank injects the pressurized liquid used in the experiment into the connecting pipe and fills the connecting pipe and the water injection hole of the fissure body model.

[0015] Step 3: The pressure detection device constantly collects the pressure data in the connecting pipe. When the pressure data detected by the pressure detection device decreases, the initiation time of the microcracks in the fissure body model is marked at this time.

[0016] Specifically, it further includes Step 4: Disconnect the connection between the connecting pipe and the fissure body model and clean the laboratory.

[0017] The present invention has achieved the following technical effects compared with the prior art:

[0018] The experimental device for detecting the initiation time of the fissure body model provided by the present invention provides pressurized liquid through the liquid supply tank and fills it into the water injection hole of the fissure body model. The pressure detection device monitors the change of the pressure data in the connecting pipe. According to the basic principle of fluid mechanics, the mechanical energy of the flowing fluid includes potential energy and kinetic energy. When there are no microcracks in the fissure body model, the pressurized liquid is in a static state in the connecting pipe. At this time, all the mechanical energy of the pressurized liquid is collected by the pressure detection device perpendicular to the connecting pipe in the form of potential energy. When microcracks occur in the fissure body model, the internal fissure volume of the fissure body model expands at this time, resulting in the reflow of the pressurized liquid in the connecting pipe. At this time, part of the potential energy of the pressurized liquid is converted into kinetic energy. Therefore, the pressure data collected by the pressure detection device will become smaller. Therefore, based on the change of the pressure data, the initiation time of the microcracks in the fissure body model can be simply obtained, and the whole device has a simple structure and does not require additional auxiliary equipment, so the cost is relatively low.

[0019] Furthermore, a T-shaped three-way valve is arranged on the connecting pipe, which is convenient for the connection between the pressure detection device and the connecting pipe.

[0020] Further, a switching valve is provided on the connecting pipe. The switching valve can conveniently control the connection and disconnection between the pressurized liquid and the water injection hole of the fractured body model, thereby facilitating the installation and cleaning of the experimental device.

[0021] Further, a base is provided. The base can firmly fix the fractured body model, and the outlet of the internal cavity of the base can be aligned with the water injection hole of the fractured body model to ensure the stable injection of the pressurized liquid into the water injection hole of the fractured body model.

[0022] Further, the liquid supply tank adopts a gas-liquid two-phase system, and the high-pressure gas provides driving power to drive the liquid to be stably injected into the water injection hole of the fractured body model.

[0023] Further, the switching valve adopts a straight-through valve, which is convenient for its installation with the connecting pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0025] Figure 1 It is a schematic diagram of the overall structure of the experimental device for detecting the fracture initiation time of the fractured body model provided by the present invention.

[0026] In the figure: 100 - experimental device for detecting the fracture initiation time of the fractured body model; 1 - liquid supply tank; 2 - connecting pipe; 3 - pressure detection device; 4 - T-shaped three-way valve; 5 - switching valve; 6 - base. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0028] The purpose of the present invention is to provide an experimental device and method for detecting the fracture initiation time of a fractured body model, so as to solve the problems existing in the prior art, make the device simple, low-cost, and be able to simply obtain the fracture initiation time of the microcracks in the fractured body model.

[0029] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0030] Embodiment 1

[0031] The present invention provides an experimental device 100 for detecting the initiation time of a crack in a fractured body model, which includes a liquid supply tank 1, a connecting pipe 2, and a pressure detection device 3. One end of the connecting pipe 2 is connected to the liquid supply tank 1, and the other end of the connecting pipe 2 is used for sealing connection and communication with the water injection hole of the fractured body model. The liquid supply tank 1 is used to supply pressurized liquid for the experiment of the fractured body model into the connecting pipe 2. The pressure detection device 3 is vertically arranged on the connecting pipe 2, and the pressure detection device 3 can detect the pressure data of the liquid in the connecting pipe 2. By providing pressurized liquid through the liquid supply tank 1 and filling it into the water injection hole of the fractured body model, the pressure detection device 3 monitors the change of the pressure data in the connecting pipe 2. According to the basic principle of fluid mechanics, the mechanical energy of the flowing fluid includes potential energy and kinetic energy. When no microcracks are generated in the fractured body model, the pressurized liquid is in a static state in the connecting pipe 2, and at this time, all the mechanical energy of the pressurized liquid is collected by the pressure detection device 3 perpendicular to the connecting pipe 2 in the form of potential energy. When microcracks are generated in the fractured body model, the internal crack volume of the fractured body model expands at this time, resulting in the reflow of the pressurized liquid in the connecting pipe 2. At this time, part of the potential energy of the pressurized liquid is converted into kinetic energy, so the pressure data collected by the pressure detection device 3 will become smaller. Therefore, based on the change of the pressure data, the initiation time of the microcracks in the fractured body model can be simply obtained, and the structure of the whole device is simple and no additional auxiliary equipment is required, so the cost is relatively low.

[0032] A T-shaped three-way valve 4 is arranged on the connecting pipe 2. Two interfaces on the T-shaped three-way valve 4 are used for connection with the connecting pipe 2, and the remaining one interface on the T-shaped three-way valve 4 is used for installing the pressure detection device 3. The T-shaped three-way valve 4 arranged on the connecting pipe 2 facilitates the connection between the pressure detection device 3 and the connecting pipe 2.

[0033] A switch valve 5 is also arranged on the connecting pipe 2, and the switch valve 5 is used to control the flow and disconnection of the liquid in the connecting pipe 2. The switch valve 5 is also arranged on the connecting pipe 2, and the switch valve 5 can conveniently control the connection and disconnection between the pressurized liquid and the water injection hole of the fractured body model, thereby facilitating the installation and cleaning of the experimental device.

[0034] The experimental device 100 for detecting the initiation time of a crack in a fractured body model further includes a base 6. The base 6 has an internal cavity with an inlet and an outlet. The inlet is connected to the connecting pipe 2, and the fractured body model can be fixedly arranged on the base 6 and the outlet is used for sealing connection and communication with the water injection port of the fractured body model. The base 6 is provided, and the base 6 can firmly fix the fractured body model, and the outlet of the internal cavity of the base 6 can be aligned with the water injection hole of the fractured body model to ensure the stable injection of pressurized liquid into the water injection hole of the fractured body model.

[0035] The liquid supply tank 1 contains the liquid for the fractured body model experiment, and an air inlet for connecting high-pressure gas injection is provided at the top of the liquid supply tank 1. The liquid supply tank 1 adopts gas-liquid two-phase, and the driving power is provided by high-pressure gas to drive the liquid to be stably injected into the water injection hole of the fractured body model.

[0036] The switching valve 5 is a straight-through valve. The switching valve 5 adopts a straight-through valve, which is convenient for its installation with the connecting pipe 2.

[0037] Embodiment 2

[0038] The present invention also provides a method for identifying the initiation time of microcracks in a fractured body model based on any one of the embodiments in Embodiment 1, including the following steps:

[0039] Step 1: Connect one end of the connecting pipe 2 to the water injection hole of the fractured body model;

[0040] Step 2: The liquid supply tank 1 injects the pressurized liquid used in the experiment into the connecting pipe 2 and fills the connecting pipe 2 and the water injection hole of the fractured body model;

[0041] Step 3: The pressure detection device 3 continuously collects the pressure data in the connecting pipe 2. When the pressure data detected by the pressure detection device 3 decreases, the initiation time of the microcracks in the fractured body model is marked at this time;

[0042] Specifically, it further includes Step 4: Disconnect the connection between the connecting pipe 2 and the fractured body model and clean the laboratory.

[0043] In the present invention, specific examples are used to elaborate the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. An experimental device for detecting the crack initiation time of a fractured body model, characterized in that: It includes a liquid supply tank, a connecting pipe and a pressure detection device. One end of the connecting pipe is communicated with the liquid supply tank, and the other end of the connecting pipe is used for sealing connection and communication with the water injection hole of the fracture body model. The liquid supply tank is used to supply pressurized liquid for the fracture body model experiment into the connecting pipe. The pressure detection device is vertically arranged on the connecting pipe, and the pressure detection device can detect the pressure data of the liquid in the connecting pipe when microcracks are generated in the fracture body model. It further includes a base. The base has an internal cavity. The cavity has an inlet and an outlet. The inlet is communicated with the connecting pipe. The fracture body model can be fixedly arranged on the base and the outlet is used for sealing connection and communication with the water injection port of the fracture body model. The liquid supply tank contains liquid for the fracture body model experiment, and an air inlet for communicating with the injection of high-pressure gas is provided at the top of the liquid supply tank.

2. The experimental device for detecting the crack initiation time of a fractured body model according to claim 1, wherein: A T-shaped three-way valve is arranged on the connecting pipe. Two interfaces on the T-shaped three-way valve are used for connection with the connecting pipe, and the remaining one interface on the T-shaped three-way valve is used for installing the pressure detection device.

3. The experimental device for detecting the cracking time of a fractured body model according to claim 1, characterized in that: A switch valve is also arranged on the connecting pipe. The switch valve is used to control the flow and disconnection of the liquid in the connecting pipe.

4. The experimental device for detecting the crack initiation time of a fractured body model according to claim 3, characterized in that: The switch valve is a straight-through valve.

5. A method for identifying the initiation time of microcracks in a marked fractured rock mass model of an experimental device for detecting the initiation time of a fractured rock mass model according to any one of claims 1 to 4, characterized in that: It includes the following steps. Step 1: Connect one end of the connecting pipe with the water injection hole of the fracture body model. Step 2: The liquid supply tank injects the pressurized liquid for the experiment into the connecting pipe and fills the connecting pipe and the water injection hole of the fracture body model. Step 3: The pressure detection device continuously collects the pressure data in the connecting pipe. When the pressure data detected by the pressure detection device decreases, the starting time of the microcracks in the fracture body model is marked at this time.

6. The method for identifying the initiation time of microcracks in a marked fractured body model according to claim 5, characterized in that: It further includes the following steps. Step 4: Disconnect the connection between the connecting pipe and the fracture body model and clean the laboratory.

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