Rock mass drilling hole wall loading contact reaction force test base device
By designing the contact reaction force test base device for the drilling hole wall loading of the rock mass, the impact of the contact reaction force on the test results is solved, and the precise evaluation and testing of contact stress is achieved, which is suitable for different pore sizes and formation conditions.
Patent Information
- Application Number
- CN202422482403.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-10-15
AI Technical Summary
In underground rock mass engineering, the impact of the contact reaction force on the test results in the hole is difficult to evaluate, resulting in changes in measurement errors and the rock mass's stress state, and the contact conditions constantly change under different apertures and loading forces, making it difficult to achieve accurate testing.
A rock drilling hole wall loading contact reaction force testing base device is designed, including the main body and the gasket. The lower side of the main body is an arc surface and the upper side is a step-shaped. A strain gauge pressure sensor is installed, and the contact strain data is recorded in real time through the test mechanism in the bolt connection hole, and the contact stress of the hole wall is evaluated.
It realizes accurate evaluation of the contact stress of the hole wall, reduces measurement errors, is suitable for different pore sizes and formation conditions, and improves the accuracy and reliability of the test.
Smart Images
Figure CN223138849U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a test base device for loading contact reaction force on the hole wall of a rock mass drill hole, belonging to the technical field of drill hole loading test. Background Technique
[0002] In underground rock mass engineering, drill hole testing is a commonly used means for testing the characteristics of rock masses. Through in-hole testing, the characteristics of rock strata can be quickly understood, and further guidance can be provided for various engineering problems. And hole wall loading test is an important method among them. By loading the rock mass on the hole wall, the strength and deformation parameters of the rock mass can be evaluated. Different from indoor testing, under in-situ drill hole conditions, the test device needs to utilize the other side hole wall to provide reaction force during the process of hole wall loading.
[0003] And the hole wall contact reaction force will have an important impact on in-hole testing. On the one hand, the hole wall contact reaction force will cause the deformation of the contacting rock mass, resulting in the displacement of the support position of the test device, bringing errors in the measurement of the in-hole displacement of the loading device. On the other hand, the contact reaction force will change the stress state of the rock mass around the hole, further affecting the in-hole test results. Therefore, realizing the evaluation of the contact reaction force during in-hole testing is an important prerequisite for understanding and result correction of in-hole testing. And the characteristics of the hole wall contact reaction force also increase the difficulty of its testing and analysis. Due to the differences in the aperture sizes under different in-hole test conditions, the contact area between the test device and the hole wall is different during different testing processes. Under the action of different loading forces, the self-deformation of the rock mass on the drill hole wall will further change the contact conditions. Therefore, the hole wall contact reaction force is a distributed force that continuously changes during the entire testing process. In order to reasonably evaluate the contact stress and its change characteristics during the testing process, better analyze the stress and deformation characteristics of the hole wall rock mass, and then realize the precision of the measurement parameters during the testing process, the present utility model is proposed. Summary of the Invention
[0004] Aiming at the deficiencies of the prior art, the utility model provides a test base device for loading contact reaction force on the hole wall of a rock mass drill hole. When the test base device is used, it is connected to the in-hole test mechanism and serves as the reaction force base of the in-hole test mechanism to realize the test of the contact reaction force during the in-hole loading process.
[0005] The technical solution of the utility model is as follows:
[0006] A test base device for loading contact reaction force on the hole wall of a rock mass drill hole includes a main body and gaskets. The lower side of the main body is an arc surface, the upper side of the main body is stepped, and a plurality of gaskets are respectively arranged at both ends of the main body. The gaskets are arc-shaped pieces, and the radian of the gaskets is the same as the radian of the arc surface on the lower side of the main body.
[0007] Preferably according to the present utility model, a plurality of cylindrical clamping grooves are symmetrically arranged at both ends of the top of the main body. An installation groove is arranged on the main body below the clamping groove for the gasket to pass through, ensuring that the gasket can be smoothly inserted into the main body. A connecting column is arranged on one side of the gasket, and the diameter of the connecting column is the same as that of the clamping groove, ensuring the matching of the connecting column and the clamping groove.
[0008] Preferably according to the present utility model, strain gauge pressure sensors are arranged on both the bottom of the main body and the gasket.
[0009] Preferably according to the present utility model, a plurality of bolt connection holes are symmetrically arranged at the top of the main body for the test mechanism in the bolt connection holes.
[0010] The usage method of the above-mentioned rock mass drilling hole wall loading contact reaction force test base device is as follows:
[0011] (1) Determine the size of the reaction force test base device according to the borehole diameter size, formation and in-situ test conditions in the hole, and install it at the bottom end of the in-hole test mechanism through bolts.
[0012] (2) Select a set number of gaskets according to the measurement range requirements and install the gaskets into the clamping grooves of the reaction force test base device.
[0013] (3) Connect the strain gauge pressure sensors on the reaction force test base device to the data acquisition system.
[0014] (4) Send the in-hole test mechanism together with the reaction force test base device to the position to be measured in the borehole, set the initial loading pressure of the in-hole test mechanism, make the reaction force test base device contact with the rock mass hole wall initially, check whether the strain reading of the gasket is zero, and record the initial readings of each strain gauge pressure sensor.
[0015] (5) Conduct in-hole loading tests. During the loading process of the in-hole test mechanism, after the reaction force test base device contacts and is stressed with the hole wall rock mass, it starts to deform. When the contact force is small, the bottom contact stress can be measured through the deformation of the arc surface of the main body, as shown in Figure 6 (a). When the contact force increases, the two side gaskets start to deform when contacting the hole wall, as shown in Figure 6 (b). The contact stress can be further evaluated through the gaskets. During the test process, the strain data of each strain gauge pressure sensor during different loading and unloading processes of the hole wall are recorded in real time, and the contact stress of the hole wall is evaluated through the relationship between the pre-calibrated contact force and strain data.
[0016] The beneficial effects of the present utility model are as follows:
[0017] The utility model has a simple structure and convenient operation. By means of the deformation of the reaction force test base device after being subjected to the contact reaction force of the hole wall, the evaluation of the contact stress can be realized. It has a wide range of applications. The corresponding base size can be selected according to different test hole diameter conditions and formation conditions, so as to realize the test of large-range contact force and contact deformation. Brief Description of the Drawings
[0018] Figure 1 is the use and assembly schematic diagram of the utility model;
[0019] Figure 2 is the structural cross-sectional schematic diagram of the utility model;
[0020] Figure 3 is the three-dimensional structural schematic diagram of the utility model;
[0021] Figure 4 is the installation schematic diagram of the main body bottom of the utility model and the strain gauge type pressure sensor;
[0022] Figure 5 is the installation schematic diagram of the gasket of the utility model and the strain gauge type pressure sensor;
[0023] Figure 6 is the schematic diagram of the test mechanism of the utility model, Figure 6 (a) is the schematic diagram of the deformation and force of the main body arc surface of the utility model, Figure 6 (b) is the schematic diagram of the deformation and force of the gasket of the utility model;
[0024] Among them: 1. Reaction force test base device; 2. In-hole test mechanism; 3. Main body; 4. Gasket; 5. Arc surface; 6. Bolt connection hole; 7. Card slot; 8. Connection column; 9. Strain gauge type pressure sensor; 10. Placement groove. Detailed Embodiment
[0025] The following further illustrates the utility model through examples in conjunction with the drawings, but is not limited thereto.
[0026] Example 1:
[0027] As Figure 1-6 shown, this embodiment provides a test base device for the contact reaction force of the rock mass borehole wall under loading, including a main body 3 and a gasket 4. The lower side of the main body 3 is an arc surface 5, and the upper side of the main body 3 is stepped. As Figure 3 shown, the in-hole test mechanism is installed in a matching manner inside the step. Three gaskets 4 are respectively arranged at both ends of the main body 3. The gasket 4 is an arc-shaped piece, and the arc degree of the gasket is the same as that of the arc surface on the lower side of the main body.
[0028] On both ends of the top of the main body 3, three cylindrical card slots 7 are symmetrically arranged. An installation groove 10 is arranged on the main body below the card slot 7 for the gasket to pass through, ensuring that the gasket can be smoothly inserted into the main body. A connecting column 8 is arranged on one side of the gasket 4, and the diameter of the connecting column is the same as the diameter of the card slot, ensuring the matching of the connecting column and the card slot.
[0029] On the bottom of the main body 3 (as Figure 4 shown, the lower side of the installation position of the strain gauge pressure sensor is an arc surface for convenient testing), and strain gauge pressure sensors 9 are arranged on both the main body 3 and the gasket 4.
[0030] A number of bolt connection holes 6 are symmetrically arranged at the top of the main body for the testing mechanism in the bolt connection holes.
[0031] The usage method of the above-mentioned rock mass borehole wall loading contact reaction force test base device is as follows:
[0032] (1) Determine the size of the reaction force test base device 1 according to the borehole diameter size, formation and in-situ test conditions in the borehole, and install it at the bottom end of the in-borehole test mechanism 2 through bolts.
[0033] (2) Select a set number of gaskets according to the measurement range requirements and install the gaskets into the card slots of the reaction force test base device.
[0034] (3) Connect the strain gauge pressure sensors on the reaction force test base device to the data acquisition system.
[0035] (4) Send the in-borehole test mechanism together with the reaction force test base device to the position to be measured in the borehole, set the initial loading pressure of the in-borehole test mechanism, so that the reaction force test base device is in preliminary contact with the rock mass borehole wall, check whether the strain reading of the gasket is zero, and record the initial readings of each strain gauge pressure sensor.
[0036] (5) Conduct in-borehole loading tests. During the loading process of the in-borehole test mechanism, after the reaction force test base device contacts and is stressed with the borehole wall rock mass, it begins to deform. When the contact force is small, the bottom contact stress can be measured through the deformation of the arc surface of the main body, as Figure 6 (a) shown. When the contact force increases, the two side gaskets begin to deform when contacting the borehole wall, as Figure 6 (b) shown. The contact stress can be further evaluated through the gaskets. During the test process, the strain data of each strain gauge pressure sensor during different loading and unloading processes of the borehole wall are recorded in real time, and the contact stress of the borehole wall is evaluated through the relationship between the pre-calibrated contact force and the strain data.
Claims
1. A testing base device for the loading contact reaction force of the rock mass borehole wall, characterized in that It includes a main body and gaskets. The lower side of the main body is an arc surface, the upper side of the main body is stepped, and several gaskets are respectively arranged at both ends of the main body. The gaskets are arc-shaped pieces, and the radian of the gaskets is the same as that of the arc surface on the lower side of the main body.
2. The rock mass borehole wall loading contact reaction force test base device according to claim 1, characterized in that Several cylindrical card slots are symmetrically arranged at both ends of the top of the main body. An installation groove is arranged on the main body below the card slots, and a connecting column is arranged on one side of the gasket.
3. The rock mass borehole wall loading contact reaction force test base device according to claim 2, characterized in that, Strain gauge pressure sensors are arranged on both the bottom of the main body and the gaskets.
4. The rock mass borehole wall loading contact reaction force test base device according to claim 1, characterized in that, Several bolt connection holes are symmetrically arranged at the top of the main body.