CN205506452U - A secondary is got core and is configure for ground stress test - Google Patents

Abstract

The utility model relates to a secondary is got core and is configure for ground stress test, it includes that base and rock specimen place the recess, the lower extreme that the recess was placed to the rock specimen is connected with the base through the screw rod bearing, the rock specimen is placed and is provided with rock specimen fixing device on the lateral wall of recess, the rock specimen is placed and still is connected with the angle fixed piece that has the through -hole on the lateral wall of recess, still including the screw rod support frame that passes angle fixed piece through -hole, the lower extreme of this screw rod support frame is articulated mutually with the base. Have the advantage of simple structure, convenient operation, low cost and freedom and flexibility, can realize that it gets the core to carry out the secondary in the laboratory to 0~90 degree direction of hoop 0~360 degree, axial of core, has improved ground stress test's accuracy.

Description

A secondary coring architecture for geostress testing

technical field

The utility model relates to a secondary coring structure for ground stress testing, which belongs to the technical field of rock sampling.

Background technique

In order to carry out scientific and reasonable excavation design and construction for various geotechnical projects, it is necessary to fully investigate one of the most important and fundamental factors affecting the stability of the project, that is, the state of ground stress. Only after a detailed understanding of the specific project area It is possible to make an economical, safe and practical engineering design only when the in-situ stress state is in place. Therefore, in-situ stress measurement is of great significance to the design, construction and production of mining, water conservancy and underground geotechnical engineering.

In-situ stress testing methods include stress relief method, hydraulic fracturing method, etc., but they have high requirements for measurement technology and process, and require a lot of work on site, which consumes a lot of cost. The acoustic emission method (Acoustic Emission, referred to as AE) is a method of measuring the ground stress in the laboratory by using the acoustic emission Kaiser effect of the rock itself. Compared with the stress relief method and hydraulic fracturing method, the AE method does not require huge on-site equipment. After drilling the rock sample, it only needs to transport the rock sample to the laboratory for testing. The test conditions are stable, and its cost is only the core method. 1/5-1/10 of that.

At present, the development of domestic acoustic emission in-situ stress testing methods is limited, mainly because it is difficult to obtain cores at specific angles on the basis of existing core drilling rigs, resulting in the inability to accurately calculate the three specific directions where the rock samples are located of ground stress.

Utility model content

The technical problem to be solved by the utility model is to provide a secondary coring framework for geostress testing. Secondary coring is performed in the direction of 0~360 degrees in the circumferential direction and 0~90 degrees in the axial direction to improve the accuracy of the ground stress test.

In order to solve the above technical problems, the utility model adopts the following technical solutions:

A secondary coring framework for geostress testing, characterized in that it includes a base and a rock sample placement groove, the lower end of the rock sample placement groove is connected to the base through a screw bearing; the side wall of the rock sample placement groove A rock sample fixing device is arranged on the top; an angle fixing block with a through hole is also connected to the side wall of the rock sample placement groove; the coring frame also includes a screw support frame passing through the through hole of the angle fixing block, and the screw The lower end of the support frame is hinged with the base.

The rock sample fixing device includes jacking screws passing through the side wall of the rock sample placement groove.

The coring frame also includes adjustable nuts for fixing the angle of the fixed block and the screw support frame.

Compared with the prior art, the utility model has the following characteristics: the utility model is suitable for secondary coring in the direction of 0-360 degrees in the circumferential direction and 0-90 degrees in the axial direction of the rock core, and can be combined with the acoustic emission testing system It is used to test the ground stress in three specific directions where the rock sample is located with related mechanical experiment instruments, which has the advantages of simple structure, convenient operation, low cost, and free and flexible use.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of the utility model. This figure shows the corresponding rock sample drilling at the angle of 70 degrees.

detailed description

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

Referring to FIG. 1 , the embodiment of the present invention includes a base 7 and a rock sample placement groove 4 , and the lower end of the rock sample placement groove 4 is connected to the base 7 through a screw bearing 6 . A rock sample fixing device 5 is arranged on the side wall of the rock sample placement groove 4 . The side wall of the rock sample placement groove 4 is also connected with an angle fixing block 3 with a through hole.

The embodiment of the utility model also includes a screw support frame 1 passing through the through hole of the angle fixing block 3 , and the lower end of the screw support frame 1 is hinged to the base 7 .

The rock sample fixing device 5 includes a tightening screw 10 passing through the side wall of the rock sample placement groove 4 .

The embodiment of the utility model also includes an adjustable nut 2 for fixing the angle fixing block 3 and the screw support frame 1 .

In this embodiment, the length of the screw support frame 1 is 550 mm, the length of the rock sample placement groove 4 is 350 mm, and the width inside the groove is 50 mm. The base 7 is long 550mm, and the inner width of the base is 60mm. The groove of the base that places the connection between the groove 4 and the base 7 plays the role of reinforcing the connection by welding the steel plate used to thicken the groove. The two ends of screw bearing 6 are fixed by nuts. The angle fixing block 3 is 50 mm away from the end of the rock sample placement groove 4, and is welded together at an angle of 45 degrees with the axial length of the rock sample placement groove 4.

The rock sample fixing device 5 is made up of two screws and a nut, and the nuts are welded at the groove edge top of the rock sample placement groove 4 at an interval of 100 mm, and are 60 mm away from the groove end near the bearing end.

When in use, the rock sample 9 is placed in the rock sample placement groove 4, and the rock sample 9 is fixed by the tightening screw 10 as one of the rock sample fixing device 5 components. The rock sample placement groove 4 is rotated along the screw bearing 6, so that the axial direction of the rock sample 9 and the direction of the device base 7 form an included angle of 70 degrees. The screw support frame 1 and the rock sample placement groove 4 are fixed by adjusting the angle fixing block 3 and the adjustable nut 2 . Then use the core drilling rig drill bit 8 to drill the rock core from top to bottom.

After the utility model is used, the fixation of the adjustable nut 2 can be released to achieve folding and placement, which is convenient to carry.

Claims (3)

1. the secondary coring framework for detecting earth stress, it is characterised in that: including that groove (4) placed by base (7) and rock sample, rock sample is placed the lower end of groove (4) and is connected with base (7) by screw-bearing (6)；Rock sample is placed and is provided with rock sample fixing device (5) on the sidewall of groove (4)；Rock sample is placed and is also associated with the angle fixed block (3) with through hole on the sidewall of groove (4)；Described coring framework also includes the screw bolt support (1) through angle fixed block (3) through hole, and the lower end of this screw bolt support (1) is hinged with base (7).

2. the secondary coring framework for detecting earth stress as claimed in claim 1, it is characterised in that: described rock sample fixing device (5) includes holding out against screw (10) through what groove (4) sidewall placed by rock sample.

3. the secondary coring framework for detecting earth stress as claimed in claim 1 or 2, it is characterised in that: described coring framework also includes the adjustable nut (2) for fixed angle fixed block (3) and screw bolt support (1).