Installation device and use method of hollow inclusion strain gauge for deep hole ground stress measurement

Abstract

The invention discloses a mounting device and a using method of a hollow inclusion strain gauge for deep hole ground stress measurement, and belongs to the technical field of ground stress measurement. The device is composed of a fixed sleeve system and a strain gauge release system. The fixed sleeve system comprises a rope hole hanging piece, an upper guide piece, an upper sleeve, a power hammer blocking piece, a lower sleeve, a strain gauge fixing pipe, a lower guide piece and the like. The strain gauge release system comprises a power hammer, a dowel bar, an empty bag fixing ball, a fixing ball release groove, a spring barrel anti-tripping buckle, an anti-tripping movable groove, a spring barrel, a spring and the like. The device is simple in structure, high in installation precision and high in automation degree, the installation of the hollow inclusion strain gauge in the deep hole in the hollow inclusion stress relief test can be completed, the problem that the deep strain measurement is difficult in the test method is solved, and the device has great significance in deep hole ground stress measurement.

Description

Technical Field

[0001] The present invention relates to the technical field of ground stress measurement equipment, and in particular to an installation device and a use method of a hollow inclusion strain gauge for deep hole ground stress measurement. Background Art

[0002] Geostress refers to the initial strain that exists naturally in the strata without any human or engineering disturbance. The stability of underground openings such as mines, shafts, tunnels, and caverns in civil engineering and mining engineering depends to a large extent on the distribution and size of geostress. During the construction process, the destruction or disturbance of the rock mass will cause the naturally formed stress deformation of the rock mass, resulting in the rearrangement and distribution of the strain inside the rock mass. The rock mass that was originally in an elastic state may change to a plastic state, or even cause it to break. Therefore, the measurement and research of geostress has always been one of the hot topics of concern for scientific researchers in the engineering community.

[0003] In recent years, the commonly used methods for measuring ground stress are stress relief method and hydraulic fracturing method. In comparison, stress relief method has better applicability, reliability and economy. Hollow inclusion stress relief method is a kind of stress relief method. It mainly installs hollow inclusion strain gauges through drilling to measure the strain changes on the wall of the small hole before and after the core gradually leaves the surrounding strain field and reaches a new equilibrium state. The three-dimensional strain state can be obtained by relieving the core stress once in a single hole. It is simple and quick to install, easy to operate, and can adapt to rock masses with poor integrity. It has high efficiency and reliability and has been widely used. However, the hollow inclusion stress relief method is currently only applicable to shallow holes, and it is difficult to measure stress in deep areas. Due to the high requirements for ground stress measurement, the installation accuracy of hollow inclusion strain gauges in deep holes is difficult to grasp, the installation process is difficult to control, and improper installation operations may affect the stress measurement results. The hollow inclusion strain gauge requires the cooperation of the drilling rig during the measurement process. After the hollow inclusion strain gauge is sent into the small hole, the core can be drilled out only after the adhesive is completely cured. Installation errors will cause a lot of time loss. The long-term parking of the drilling rig will occupy the production space and affect the production progress. Therefore, the study of a deep hole ground stress measurement hollow inclusion strain gauge installation device can help reduce the difficulty of installing the hollow inclusion strain gauge in the deep hole, which is of great significance to improving the accuracy of ground stress measurement results and ensuring production progress. Summary of the invention

[0004] In view of the above-mentioned technical deficiencies, the object of the present invention is to provide an installation device and a method for using a hollow inclusion strain gauge for deep hole ground stress measurement with low installation difficulty, high precision and high degree of automation.

[0005] The technical solution adopted to solve the above-mentioned problem is an installation device for a hollow package strain gauge for deep hole ground stress measurement, characterized in that it includes a fixed sleeve system and a strain gauge release system, the fixed sleeve system includes a rope hole hanging plate, an upper guide plate, an upper sleeve, a power hammer barrier plate, a lower sleeve, a strain gauge fixed tube, and a lower guide plate, the rope hole hanging plate is located at the top of the upper sleeve, the upper guide plate that keeps the device vertical during the descent process is located on the left and right sides of the upper end of the outer wall of the upper sleeve, and the lower guide plate that keeps the device vertical during the descent process is located on the left and right sides of the lower end of the outer wall of the lower sleeve, the power hammer barrier plate with a through hole in the middle is located on the upper part of the inner wall of the lower sleeve, and the strain gauge fixed tube is located below the power hammer barrier plate; the strain gauge release system includes a power hammer, a force transmission rod, an empty package fixed ball, a fixed ball release groove, a spring tube anti-disconnection, an anti-disconnection movable groove, a spring tube, and a spring, the power hammer is located inside the upper sleeve, the lower end of the power hammer is connected to the force transmission rod, the force transmission rod slides through the through hole on the power hammer barrier plate, and the strain gauge fixed tube is suspended and fixed On the lower surface of the power hammer baffle, a through hole for installing the empty bag fixing ball is opened on the upper wall of the strain gauge fixing tube, and an anti-dropping movable groove is opened on the lower wall of the strain gauge fixing tube. A part of the spring tube slides from the bottom end of the lower sleeve into the lower sleeve, and the spring is sleeved on the outer side of the bottom of the spring tube. The top end of the spring presses against the bottom end of the lower guide plate, so that the spring tube can slide up and down along the inner wall of the lower sleeve under the action of elastic force; in the natural state of the spring, the top end of the spring tube is higher than the through hole position of the empty bag fixing ball, and the empty bag fixing ball is squeezed The hollow package fixed ball is pressed into the fixed ball groove at the tail of the hollow package strain gauge inserted in the strain gauge fixing tube. A fixed ball release groove is opened on the inner wall of the spring cylinder below the through hole for installing the empty package fixed ball. A spring cylinder anti-tripping buckle inserted into the anti-tripping movable groove is arranged on the inner wall of the spring cylinder below the fixed ball release groove. When the spring is compressed, the spring cylinder moves upward, and the empty package fixed ball moves from the fixed ball groove at the tail of the hollow package strain gauge to the fixed ball release groove. The power hammer presses down through the force transmission rod to send the hollow package strain gauge to the specified position.

[0006] The upper sleeve and the lower sleeve are hollow cylinders, which are divided into two upper and lower sections at the power hammer barrier plate and are connected by threads.

[0007] The power hammer is a solid cylinder, which is larger than the diameter of the force transmission rod and is fixedly connected to the force transmission rod.

[0008] The force transmission rod passes through the through hole in the center of the power hammer barrier plate, and its length is greater than the length from the bottom of the power hammer barrier plate to the bottom of the spring cylinder.

[0009] The blank package fixing balls are arranged one on each of the left and right sides of the middle of the strain gauge fixing tube, and the diameter thereof is greater than the thickness of the strain gauge fixing tube.

[0010] The anti-tripping movable groove consists of an annular groove, two short grooves opening vertically downward and two vertical long grooves. The vertical grooves are vertically symmetrically distributed and have a width greater than the anti-tripping width of the spring tube.

[0011] The spring tube anti-dropping buckle is located at the bottom of the vertical long groove of the spring tube movable groove when the spring is not under pressure.

[0012] The spring tube is a hollow cylinder, and the distance from the upper end to the power hammer barrier is less than the length of the vertical long groove of the spring tube movable groove, and greater than the compression deformation of the spring.

[0013] The method for using the installation device of the hollow inclusion strain gauge for deep hole ground stress measurement comprises the following steps:

[0014] Step 1: Use a drill to drill a large hole. After reaching the predetermined measuring depth, grind the bottom of the hole, and then drill a small test hole concentrically for installing the hollow package strain gauge.

[0015] Step 2: Install the power hammer and force transmission rod to the upper sleeve on the ground, connect and fix them with the lower sleeve, install the spring sleeve through the anti-tripping movable groove, and then use the empty package fixing ball to clamp the probe of the hollow package strain gauge in the spring sleeve. Use the drilling rig and wire rope to lower the installation device to the bottom of the hole;

[0016] Step 3: After the installation device reaches the predetermined position, the bottom spring is compressed, the hollow body strain gauge is separated from the installation device, and the power hammer moves downward to squeeze the hollow body strain gauge into the small hole through the force transmission rod;

[0017] Step 4: The guide head of the hollow package reaches the bottom of the small hole, and the power hammer continues to move downward to break the fixing pin inside the hollow package, squeeze out the adhesive in the epoxy resin cylinder, and fill the gap between the hollow package strain gauge and the wall of the small hole;

[0018] Step 5, lifting the installation device to the surface, leaving the hollow package strain gauge in the small hole;

[0019] Step six: After the adhesive is solidified, use a large-diameter drill bit to drill the core. During the drilling process, the data acquisition recorder records the test data. After drilling 600 mm, stop drilling and take out the core.

[0020] The diameter of the large hole is 130 mm, the diameter of the small hole is 60 mm, and the depth is 500 mm.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1. The thrust of the hollow inclusion stress gauge in the present invention comes from the gravity of the power hammer, which prevents the hollow inclusion stress gauge from being damaged by squeezing the rock wall due to excessive thrust, affecting the test results, and ensures installation efficiency.

[0023] 2. The present invention adopts a cylindrical shape, the diameter of the cylinder is larger than the diameter of the small hole, the outer guide plate makes the width of the equipment close to the diameter of the large hole, and the hollow package strain gauge is fixed to the center axis of the equipment by the hollow package fixing ball, so that the device remains vertical during the falling process in the hole, and the hollow package strain gauge accurately reaches the small hole at the bottom of the hole, ensuring the installation accuracy.

[0024] 3. The strain gauge release system of the present invention is triggered by the compression of the spring at the bottom of the device, has a high degree of automation, and can complete the installation of the hollow package strain gauge regardless of the distance, meeting the needs of stress relief tests in deep holes.

[0025] 4. The present invention has a simple structure and is convenient for transportation and assembly in a small space. It has low requirements for the drilling rig and is only connected to the drilling rig by a steel wire rope. The installation can be completed by a simple lowering and pulling-up process of the drilling rig, which reduces production costs and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of a hollow inclusion strain gauge installation device for deep hole ground stress measurement provided by an embodiment of the present invention;

[0027] Figure 2 A schematic diagram of the structure of a hollow envelope strain gauge provided in an embodiment of the present invention;

[0028] Figure 3 A schematic diagram of the structure of the fixing and releasing parts of the strain gauge provided in an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the device provided by an embodiment of the present invention when it is working.

[0030] In the figure: 1-rope hole hanging plate; 2-upper guide plate; 3-upper sleeve; 4-power hammer; 5-force transmission rod; 6-power hammer barrier plate; 7-lower sleeve; 8-strain gauge fixing tube; 9-empty bag fixing ball; 10-fixing ball release groove; 11-spring tube anti-dropping buckle; 12-anti-dropping movable groove; 13-spring tube; 14-lower guide plate; 15-spring; 21-fixing ball groove; 22-data acquisition recorder; 23-epoxy resin cylinder; 24-fixing pin; 25-guide head. Specific implementation methods

[0032] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0034] In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features.

[0035] Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0036] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0037] like Figure 1-4As shown, the installation device of the hollow inclusion strain gauge for deep hole ground stress measurement of the present invention includes a fixed sleeve system and a strain gauge release system. The fixed sleeve system includes a rope hole hanging piece 1, an upper guide piece 2, an upper sleeve 3, a power hammer barrier piece 6, a lower sleeve 7, a strain gauge fixing tube 8, and a lower guide piece 15. The rope hole hanging piece 1 is located at the top of the upper sleeve 3, and the upper guide piece 2 that keeps the device vertical during the descent process is located on the left and right sides of the upper end of the outer wall of the upper sleeve 3. The lower guide piece 14 that keeps the device vertical during the descent process is located on the left and right sides of the lower end of the outer wall of the lower sleeve 7. The power hammer baffle 6 with a through hole in the middle is located on the upper inner wall of the lower sleeve 7, and the strain gauge fixing tube 8 is located below the power hammer baffle 6; the strain gauge release system includes a power hammer 4, a force transmission rod 5, an empty bag fixing ball 9, a fixing ball release groove 10, a spring tube anti-tripping buckle 11, an anti-tripping movable groove 12, a spring tube 13, and a spring 15. The power hammer 4 is located inside the upper sleeve 3, and the lower end of the power hammer 4 is connected to the force transmission rod 5, which slides through the through hole on the power hammer baffle 6, and the strain gauge fixing tube 8 is suspended and fixed on the lower surface of the power hammer baffle 6. A through hole for installing the empty bag fixing ball 9 is opened on the upper wall of the strain gauge fixing tube 8, and an anti-dropping movable groove 12 is opened on the lower wall of the strain gauge fixing tube 8. A part of the spring tube 13 slides from the bottom end of the lower sleeve 7 into the lower sleeve 7, and the spring 15 is sleeved on the outer side of the bottom of the spring tube 13. The top end of the spring 15 presses on the bottom end of the lower guide piece 14, so that the spring tube 13 can slide up and down along the inner wall of the lower sleeve 7 under the action of elastic force; when the spring 15 is in a natural state, the top end of the spring tube 13 is higher than the through hole position of the empty bag fixing ball 9, and the empty bag fixing ball 9 is squeezed to be inserted into the strain In the fixed ball groove 21 at the tail of the hollow enclosed body strain gauge in the gauge fixing tube 8, a fixed ball release groove 10 is opened on the inner wall of the spring cylinder 13 located below the through hole for installing the empty enclosed body fixed ball 9, and a spring cylinder anti-tripping buckle 11 inserted into the anti-tripping movable groove 12 is provided on the inner wall of the spring cylinder 13 below the fixed ball release groove 10. When the spring 15 is compressed, the spring cylinder 13 moves upward, and the empty enclosed body fixed ball 9 moves from the fixed ball groove 21 at the tail of the hollow enclosed body strain gauge to the fixed ball release groove 10, and the power hammer 4 presses down through the force transmission rod 5 to send the hollow enclosed body strain gauge to the specified position.

[0038] Furthermore, the upper sleeve 3 and the lower sleeve 7 are hollow cylinders, which are divided into two upper and lower sections at the power hammer barrier 6 and connected by threads.

[0039] Furthermore, the power hammer 4 is a solid cylinder, which is larger than the diameter of the force transmission rod 5 and is fixedly connected to the force transmission rod 5 .

[0040] Furthermore, the force transmission rod 5 passes through the through hole in the center of the power hammer barrier plate 6 , and its length is greater than the length from the bottom of the power hammer barrier plate 6 to the bottom of the spring tube 13 .

[0041] Furthermore, the blank fixing balls 9 are arranged one on each of the left and right sides of the middle of the strain gauge fixing tube 8 , and the diameter thereof is greater than the thickness of the strain gauge fixing tube 8 .

[0042] Furthermore, the anti-tripping movable groove 12 is composed of an annular groove, two short grooves opening vertically downward and two vertical long grooves. The vertical grooves are vertically symmetrically distributed and have a width greater than the width of the spring tube anti-tripping 11.

[0043] Furthermore, the spring tube anti-tripping buckle 11 is located at the bottom of the vertical long groove of the spring tube movable groove 11 when the spring 15 is not under pressure.

[0044] Furthermore, the spring tube 13 is a hollow cylinder, and the distance from the upper end to the power hammer barrier plate 6 is less than the length of the vertical long groove of the spring tube movable groove 11, and greater than the compression deformation of the spring 15.

[0045] Specifically, the method for using the hollow inclusion strain gauge installation device for deep hole ground stress measurement of the present invention comprises the following steps:

[0046] Step 1: Use a drilling rig to drill a hole with a diameter of 130mm. After reaching the predetermined measuring depth, grind the bottom of the hole, and then concentrically drill a test hole with a diameter of 60mm and a depth of about 500mm for installing the hollow package strain gauge.

[0047] Step 2: Install the power hammer 4 and the force transmission rod 5 to the upper sleeve 3 on the ground, and connect and fix them with the lower sleeve 7. Install the spring sleeve 3 through the anti-tripping movable groove 12, and then use the empty package fixing ball 9 to clamp the hollow package strain gauge in the spring sleeve 3. Use the drilling rig and wire rope to lower the installation device to the bottom of the hole.

[0048] Step 3: After the installation device reaches the predetermined position, the bottom spring 15 is compressed, the hollow enclosed body strain gauge is separated from the installation device, and the power hammer 4 moves downward to squeeze the hollow enclosed body strain gauge into the small hole through the force transmission rod 5.

[0049] Step 4: The hollow package guide head 25 reaches the bottom of the small hole, and the power hammer 4 continues to move downward, breaking the fixing pin 24 inside the hollow package strain gauge, squeezing out the adhesive in the epoxy resin tube 23, and filling the gap between the hollow package strain gauge and the small hole wall.

[0050] Step 5: Lift the installation device to the surface and leave the hollow body strain gauge in the hole.

[0051] Step 6: After the adhesive is solidified, a drill bit with a diameter of 130 mm is used to core the sample. During the core core process, the data acquisition recorder 22 records the test data. After drilling for about 600 mm, the drilling is stopped and the core is taken out.

[0052] The upper sleeve 3 and the lower sleeve 7 are hollow cylinders, which are divided into upper and lower sections at the power hammer barrier 6 and connected by threads. The inner diameter is larger than the outer diameter of the spring tube 15, and the outer diameter is smaller than the large hole diameter and larger than the measuring small hole diameter.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An installation device for a hollow inclusion strain gauge for deep hole ground stress measurement, characterized in that: The invention comprises a fixed sleeve system and a strain gauge release system. The fixed sleeve system comprises a rope hole hanging plate (1), an upper guide plate (2), an upper sleeve (3), a power hammer blocking plate (6), a lower sleeve (7), a strain gauge fixing tube (8), and a lower guide plate (15). The rope hole hanging plate (1) is located at the top of the upper sleeve (3). The upper guide plate (2) for keeping the device vertical during the descent process is located at the left and right sides of the upper end of the outer wall of the upper sleeve (3). The lower guide plate (14) for keeping the device vertical during the descent process is located at the left and right sides of the lower end of the outer wall of the lower sleeve (7). The power hammer blocking plate (6) with a through hole in the middle is located at the upper part of the inner wall of the lower sleeve (7). The strain gauge fixing tube (8) is located below the power hammer barrier (6); the strain gauge release system comprises a power hammer (4), a force transmission rod (5), a blank fixed ball (9), a fixed ball release groove (10), a spring tube anti-tripping buckle (11), an anti-tripping movable groove (12), a spring tube (13), and a spring (15); the power hammer (4) is located inside the upper sleeve (3); the power hammer (4) is connected to the force transmission rod (5) at the lower end; the force transmission rod (5) slides through a through hole on the power hammer barrier (6); the strain gauge fixing tube (8) is suspended and fixed on the lower surface of the power hammer barrier (6); a hole is opened on the upper tube wall of the strain gauge fixing tube (8); A through hole for installing a blank package fixing ball (9) is provided on the lower wall of the strain gauge fixing tube (8) with an anti-dropping movable groove (12). A portion of the spring tube (13) is slidably inserted into the lower sleeve (7) from the bottom end of the lower sleeve (7). The spring (15) is sleeved on the outer side of the bottom of the spring tube (13). The top end of the spring (15) is pressed against the bottom end of the lower guide plate (14), so that the spring tube (13) can slide up and down along the inner wall of the lower sleeve (7) under the action of elastic force. When the spring (15) is in a natural state, the top end of the spring tube (13) is higher than the through hole position of the blank package fixing ball (9), and the blank package fixing ball (9) is squeezed to be inserted into the strain gauge fixing tube (8). A fixed ball release groove (10) is formed in the fixed ball groove (21) at the tail of the hollow encapsulated strain gauge, and the inner wall of the spring cylinder (13) below the through hole for installing the empty encapsulated fixed ball (9) is provided with a fixed ball release groove (10). A spring cylinder anti-tripping buckle (11) inserted into the anti-tripping movable groove (12) is provided on the inner wall of the spring cylinder (13) below the fixed ball release groove (10). When the spring (15) is compressed, the spring cylinder (13) moves upward, and the empty encapsulated fixed ball (9) moves from the fixed ball groove (21) at the tail of the hollow encapsulated strain gauge to the fixed ball release groove (10). The power hammer (4) is pressed downward through the force transmission rod (5) to send the hollow encapsulated strain gauge to a specified position.

2. The installation device of the hollow inclusion strain gauge for deep hole ground stress measurement according to claim 1 is characterized in that: The upper sleeve (3) and the lower sleeve (7) are hollow cylinders, which are divided into two upper and lower sections at the power hammer barrier (6) and are connected by threads.

3. The installation device of the hollow inclusion strain gauge for deep hole ground stress measurement according to claim 1 is characterized in that: The power hammer (4) is a solid cylinder, has a diameter larger than that of the force transmission rod (5), and is fixedly connected to the force transmission rod (5).

4. The installation device of the hollow inclusion strain gauge for deep hole ground stress measurement according to claim 1 is characterized in that: The force transmission rod (5) passes through the through hole in the center of the power hammer barrier (6), and its length is greater than the length from the bottom of the power hammer barrier (6) to the bottom of the spring tube (13).

5. The installation device of the hollow inclusion strain gauge for deep hole ground stress measurement according to claim 1 is characterized in that: The blank package fixing ball (9) is arranged one on each of the left and right sides of the middle of the strain gauge fixing tube (8), and the diameter thereof is greater than the thickness of the strain gauge fixing tube (8).

6. The installation device of the hollow inclusion strain gauge for deep hole ground stress measurement according to claim 1 is characterized in that: The anti-dropout movable groove (12) consists of an annular groove, two short grooves opening vertically downward and two vertical long grooves, the vertical grooves are vertically symmetrically distributed and have a width greater than the width of the spring tube anti-dropout (11).

7. The installation device of the hollow inclusion strain gauge for deep hole ground stress measurement according to claim 6 is characterized in that: The spring tube anti-tripping buckle (11) is located at the bottom of the vertical long groove of the spring tube movable groove (11) when the spring (15) is not under pressure.

8. The installation device of the hollow inclusion strain gauge for deep hole ground stress measurement according to claim 1 is characterized in that: The spring tube (13) is a hollow cylinder, and the distance from the upper end to the power hammer blocking plate (6) is less than the length of the vertical long groove of the spring tube movable groove (11) and greater than the compression deformation of the spring (15).

9. A method for using the installation device of the hollow inclusion strain gauge for deep hole ground stress measurement according to any one of claims 1 to 8, characterized in that: The steps include: Step 1: Use a drill to drill a large hole. After reaching the predetermined measuring depth, grind the bottom of the hole, and then drill a small test hole concentrically for installing the hollow package strain gauge. Step 2: Install the power hammer (4) and the force transmission rod (5) on the upper sleeve (3) on the ground, and connect and fix them with the lower sleeve (7), install the spring sleeve (3) through the anti-tripping movable groove (12), and then use the empty package fixing ball (9) to clamp the probe of the hollow package strain gauge in the spring sleeve (3), and use the drilling rig to lower the installation device to the bottom of the hole with a wire rope; Step 3: After the installation device reaches the predetermined position, the bottom spring (15) is compressed, the hollow body strain gauge is separated from the installation device, and the power hammer (4) moves downward to squeeze the hollow body strain gauge into the small hole through the force transmission rod (5); Step 4: The hollow package guide head (25) reaches the bottom of the small hole, and the power hammer (4) continues to move downward to break the fixing pin (24) inside the hollow package, squeeze out the adhesive in the epoxy resin cylinder (23), and fill the gap between the hollow package strain gauge and the small hole wall; Step 5, lifting the installation device to the surface, leaving the hollow package strain gauge in the small hole; Step 6: After the adhesive is solidified, a drill bit with a large hole diameter is used to drill the core. During the drilling process, a data acquisition recorder (22) records the test data. After drilling 600 mm, the drilling is stopped and the core is taken out.

10. The method for using the installation device of the hollow inclusion strain gauge for deep hole ground stress measurement according to claim 9, characterized in that: The diameter of the large hole is 130 mm, the diameter of the small hole is 60 mm, and the depth is 500 mm.

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