Sample structure capable of directly manufacturing rock mass with fissure surface

Abstract

The utility model relates to a sample structure capable of directly manufacturing a rock mass with a fissure surface, which belongs to the technical field of geotechnical engineering survey, and comprises a rock mass drilling device, the rock mass drilling device consists of a sampling drill bit, a first sleeve and a second sleeve, and a three-section mold assembly is arranged between the first sleeve and the second sleeve; the three-section mold assembly comprises a fixing ring and a three-section mold, the fixing ring is connected to the middle of the three-section mold in a sleeving mode, the two sides of the three-section mold are inserted into the inner side of the first sleeve and the inner side of the second sleeve respectively, and the two sides of the fixing ring are in threaded connection with the first sleeve and the second sleeve respectively. According to the sample structure capable of directly manufacturing the rock mass with the fissure surface, the rock sample does not need to be secondarily processed, the sample preparation is convenient and fast, the fissure surface almost similar to the natural state can be obtained, the state of the sample better conforms to the actual situation, meanwhile, water seepage holes can be added according to needs, and the obtained sample can also be used for a seepage test.

Description

Technical Field

[0001] The utility model relates to the technical field of geotechnical engineering survey, in particular to a sample structure which can directly produce a rock mass with a fracture surface. Background Art

[0002] With the advancement of science and technology, the mode of transportation has gradually changed from a single ground transportation to a diversified mode of transportation by sea, land and air, and tunnel engineering has become the main way to break geographical barriers. Its operational capacity and environmental benefits bring great value to society. my country is a country with many rivers and a maritime power with a 20,000-kilometer winding coastline. With the development of the economy, the demand for cross-river and cross-sea transportation is increasing day by day, and the development of cross-river and cross-sea tunnels is imperative. Especially in the southwest of my country, which is mainly hilly, mountainous and rivery, there is an urgent need to build cross-river tunnels to build connections between the two sides of the river and strengthen economic exchanges between the two sides of the river. Compared with other tunnels, cross-river tunnels have the following characteristics: First, the mutual influence between the seepage field and the stress field. The presence of water will change the physical and mechanical properties of the surrounding rock, thereby changing the stress state of the surrounding rock, and the change in the stress state will also affect the tunnel seepage and the water pressure on the lining; second, the water pressure (including static water pressure and dynamic water pressure) is more important in the entire load system, and the load borne by the tunnel structure is mainly water pressure; third, the cross-river tunnel has an unlimited supply of water sources. Under high water pressure and crossing poor geological sections, it is more likely to cause water and mud burst accidents, and if an accident occurs, the consequences will be catastrophic. Generally speaking, the strata of underwater tunnels are affected by water for a long time, and the strata contain abundant fissure water. The fissures have a great influence on the mechanical properties of the rock mass. Under the long-term sedimentation of the strata, the properties of the rock masses on both sides of the fissures are mostly different. There are many interlayers of different rock properties in the strata, which brings great challenges to engineering construction.

[0003] In order to determine the mechanical properties of the rock mass at the interlayer structural surface of different lithologies, it is necessary to sample the interlayer rock mass. Due to the large fragmentation of the rock mass, it is basically difficult to obtain complete interlayer rock samples for experiments in actual engineering. At present, there are two main methods for making rock samples with cracks. One is to cut the complete rock sample according to the shape of the crack, generally in a stepped or flat shape, and then use an adhesive to bond the two rock samples to obtain a complete rock sample; the other is to use a similar simulation method to prepare samples. Taking the rock sample of sandstone-mudstone interlayer as an example, the sample preparation steps are as follows: 1. Drill a mudstone sample to obtain a cylindrical rock sample of sandstone; 2. Cut the cylindrical rock sample; 3. Use cement mortar to pour on the mudstone sample to simulate the properties of sandstone. After the cement mortar solidifies, demold and sample.

[0004] However, the existing rock sample preparation method still has the following defects. First, the strength of the rock sample measured using the adhesive is greatly affected by the adhesive and cannot well reflect the strength properties of the fracture surface. Second, the fracture surface of the artificially cut rock sample cannot truly reflect the actual engineering situation. The fracture surface in the project generally does not appear stepped or flat, but irregularly curved. Moreover, the mechanical properties of the rock sample may change significantly after secondary cutting of the rock sample.

[0005] Based on the above defects, a sample structure for directly making rock mass with fracture surfaces is proposed to solve the above problems. Utility Model Content

[0006] In view of the shortcomings of the prior art, the utility model provides a sample structure that can directly produce rock samples with fracture surfaces. The device can pour similar materials on the other side of the rock sample without secondary cutting after the rock sample is taken out from the formation, thereby reducing the disturbance to the original rock sample, and conveniently and quickly producing test rock samples. It can simulate the conditions of the original fracture surface in the project, and solves the problems existing in the prior art.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a sample structure that can directly produce a rock mass with a fracture surface, comprising a rock mass drilling device, the rock mass drilling device is composed of a sampling drill bit, a first sleeve and a second sleeve, and a three-petal mold assembly is arranged between the first sleeve and the second sleeve;

[0008] The three-flap mold assembly comprises a fixing ring and a three-flap mold, wherein the fixing ring is sleeved on the middle part of the three-flap mold, two sides of the three-flap mold are respectively inserted into the inner sides of the first sleeve and the second sleeve, and two sides of the fixing ring are respectively threadedly connected with the first sleeve and the second sleeve;

[0009] Among them, it also includes:

[0010] A three-piece mold base for assembling the three-piece mold assembly;

[0011] The three-flap mold base includes a fixed chassis and a top fixed sleeve respectively sleeved on both ends of the three-flap mold, three fixed rods are connected between the fixed chassis and the top fixed sleeve, and a rock sample seepage hole reserved component is also provided on the side of the top fixed sleeve away from the three-flap mold.

[0012] Furthermore, the sampling drill bit is threadedly mounted at an end of the first sleeve away from the fixing ring.

[0013] Furthermore, the fixing ring is composed of two semicircular arc blocks, and a first positioning groove and a first clamping block are respectively provided on both sides of the fixing ring, and the first clamping block is adapted to the inner side of the first positioning groove.

[0014] Furthermore, a mounting groove adapted to the fixing ring is provided in the middle of the three-petal mold.

[0015] Furthermore, the three-petal mold is composed of three 120° arc-shaped plates, wherein a second positioning groove and a second clamping block are respectively arranged between two adjacent groups of the 120° arc-shaped plates, and the second clamping block is adapted to the inner side of the second positioning groove.

[0016] Furthermore, the rock sample seepage hole reservation component is composed of a fixed disc and a solid cylinder, and a hollow cylinder is fixedly connected to one side of the fixed disc close to the solid cylinder.

[0017] Furthermore, the outer wall of the solid cylinder is matched with the inner wall of the hollow cylinder, and a spring is fixedly connected to one end of the solid cylinder close to the hollow cylinder.

[0018] Furthermore, blind holes matching the fixing rods are provided on the outer wall of the fixing disc, and the number of the blind holes is equal to the number of the fixing rods.

[0019] Compared with the prior art, the utility model provides a sample structure that can directly produce a rock mass with a fracture surface, and has the following beneficial effects:

[0020] The sample structure of the rock mass with a fracture surface can be directly produced by adding a device with a three-petal mold to a conventional drilling device. After drilling the core, since the rock mass with a fracture surface is relatively broken, the internal rock mass can be easily taken out, leaving only one type of rock mass, and then poured inside the three-petal mold. After the poured material solidifies, demolding is performed to obtain the sample with a structural surface required for the test. By cooperating with the above device for sample preparation, there is no need to perform secondary processing on the rock sample, and the sample preparation is convenient. A fracture surface that is almost the same as the natural state can be obtained, and the state of the sample is more in line with the actual situation. At the same time, seepage holes can be added as needed, so that the obtained sample can also be used for seepage tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of a rock drilling device that can directly produce a sample structure of a rock mass with a fracture surface according to the utility model;

[0022] Figure 2 This is a schematic diagram of the structure disassembly of a rock drilling device that can directly produce a sample structure of a rock mass with a fracture surface according to the utility model;

[0023] Figure 3 This is a schematic diagram of the structural assembly of a three-petal mold base that can directly produce a sample structure of a rock mass with a fracture surface according to the utility model;

[0024] Figure 4This is a schematic diagram of the structural disassembly of a three-petal mold base of the utility model that can directly produce a sample structure of a rock mass with a fracture surface;

[0025] Figure 5 This is a structural side view of a rock sample seepage hole reservation component that can directly produce a sample structure of a rock mass with a fracture surface according to the utility model;

[0026] Figure 6 This is a structural side view of a three-petal mold base of the utility model that can directly produce a sample structure of a rock mass with a fracture surface;

[0027] Figure 7 It is a cross-sectional schematic diagram of a fixing ring and a three-petal mold of the utility model that can directly produce a sample structure of a rock mass with a fracture surface;

[0028] Figure 8 This is a schematic diagram of the structural disassembly of a fixing ring of the utility model that can directly produce a sample structure of a rock mass with a fracture surface;

[0029] Fig. 9 The utility model is a schematic diagram of the structural splitting of a three-petal mold which can directly produce a sample structure of a rock mass with a fracture surface.

[0030] In the figure: 1. sampling drill bit; 2. first sleeve; 3. fixing ring; 31. first positioning groove; 32. first clamping block; 4. second sleeve; 5. three-petal mold; 51. mounting groove; 52. second positioning groove; 53. second clamping block; 6. fixed chassis; 7. fixing rod; 8. top fixing sleeve; 9. rock sample seepage hole reserved assembly; 90. fixed disc; 91. solid cylinder; 92. hollow cylinder; 93. spring. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] See also Figures 1 to 9 In this embodiment, a sample structure of a rock mass with a fracture surface can be directly produced, including a rock mass drilling device, which is composed of a sampling drill bit 1, a first sleeve 2 and a second sleeve 4.

[0033] In this embodiment, a three-lobed mold assembly is arranged between the first sleeve 2 and the second sleeve 4. The three-lobed mold assembly includes a fixing ring 3 and a three-lobed mold 5. The fixing ring 3 is sleeved on the middle part of the three-lobed mold 5. Both sides of the three-lobed mold 5 are respectively inserted into the inner sides of the first sleeve 2 and the second sleeve 4. Both sides of the fixing ring 3 are respectively threadedly connected to the first sleeve 2 and the second sleeve 4.

[0034] Among them, the sampling drill bit 1 is threadedly installed at one end of the first sleeve 2 away from the fixed ring 3. The fixed ring 3 is composed of two semicircular arc blocks. The first positioning groove 31 and the first clamping block 32 are respectively arranged on both sides of the fixed ring 3. The first clamping block 32 is adapted to the inner side of the first positioning groove 31. The middle part of the three-petal mold 5 is provided with a mounting groove 51 adapted to the fixed ring 3. The three-petal mold 5 is composed of three 120° arc plates, wherein the second positioning groove 52 and the second clamping block 53 are respectively arranged between two groups of adjacent 120° arc plates, and the second clamping block 53 is adapted to the inner side of the second positioning groove 52.

[0035] In this embodiment, a sample structure that can directly produce a rock mass with a fracture surface also includes: a three-piece mold base for assembling the three-piece mold assembly.

[0036] In this embodiment, the three-petal mold base includes a fixed chassis 6 and a top fixed sleeve 8 respectively sleeved on both ends of the three-petal mold 5, three fixed rods 7 are connected between the fixed chassis 6 and the top fixed sleeve 8, and a rock sample seepage hole reserved component 9 is also provided on the side of the top fixed sleeve 8 away from the three-petal mold 5.

[0037] Among them, the rock sample seepage hole reserved component 9 is composed of a fixed disc 90 and a solid cylinder 91, and a hollow cylinder 92 is fixedly connected to one side of the fixed disc 90 close to the solid cylinder 91, the outer wall of the solid cylinder 91 is adapted to the inner wall of the hollow cylinder 92, and a spring 93 is fixedly connected to one end of the solid cylinder 91 close to the hollow cylinder 92.

[0038] It should be added that blind holes matching the fixing rods 7 are provided on the outer wall of the fixing disc 90 , and the number of the blind holes is equal to the number of the fixing rods 7 , so as to facilitate the assembly of the fixing rods 7 and the rock sample seepage hole reserved assembly 9 .

[0039] The working principle of the above embodiment is:

[0040] When in use, first assemble the fixing ring 3 and the three-flap mold 5, and respectively sleeve the first sleeve 2 and the second sleeve 4 on both sides of the three-flap mold 5, and respectively thread the first sleeve 2 and the second sleeve 4 with the two sides of the fixing ring 3, and then install the sampling drill bit 1 on the other end of the first sleeve 2, and then connect the other end of the second sleeve 4 to the drilling machine, so as to use the device for drilling sampling. After drilling the core, remove the device from the drilling machine, remove the sampling drill bit 1, the first sleeve 2 and the second sleeve 4, and perform the rock sampling operation. The steps of sampling are as follows:

[0041] Step 1: Take out the three-petal mold 5 and connect one end of it to the fixed chassis 6. At this time, do not install the top fixing sleeve 8 and the rock sample seepage hole reserved component 9;

[0042] Step 2: Take out the broken rock sample inside the three-petal mold 5, leaving only the rock sample of one lithology (if it is necessary to make a sample of sandstone-mudstone interlayer, the sandstone inside the three-petal mold 5 is taken out and only the mudstone is left. The composition of the rock sample inside the three-petal mold can be determined according to the panoramic imaging of the borehole);

[0043] Step 3: Connect the top fixing sleeve 8 to the other end of the three-petal mold 5, connect the fixing rod 7 between the top fixing sleeve 8 and the fixed chassis 6, and pour cement mortar from the other side of the top fixing sleeve 8;

[0044] Step 4: If it is necessary to reserve seepage holes in the rock sample during sample preparation, install the rock sample seepage hole reservation component 9 on the other side of the top fixing sleeve 8, insert the solid cylinder 91 into the hollow cylinder 92, adjust the length of the solid cylinder 91 inside the three-petal mold 5 by the elastic action of the spring 93, and connect the fixed disc 90 with the fixed rod 7;

[0045] Step 5: After the cement mortar solidifies, take out the three-piece mold 5 and demould it.

[0046] The installation method, connection method or setting method disclosed in this embodiment are all common mechanical methods, and can be implemented as long as they can achieve their beneficial effects. It should be noted that in this article, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0047] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0048] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sample structure for directly producing a rock mass with a fracture surface, comprising a rock mass drilling device, characterized in that: The rock drilling device is composed of a sampling drill bit (1), a first sleeve (2) and a second sleeve (4), wherein a three-piece mold assembly is arranged between the first sleeve (2) and the second sleeve (4); The three-flap mold assembly comprises a fixing ring (3) and a three-flap mold (5), wherein the fixing ring (3) is sleeved on the middle part of the three-flap mold (5), and two sides of the three-flap mold (5) are respectively inserted into the inner sides of the first sleeve (2) and the second sleeve (4), and two sides of the fixing ring (3) are respectively threadedly connected to the first sleeve (2) and the second sleeve (4); Among them, it also includes: A three-piece mold base for assembling the three-piece mold assembly; The three-flap mold base comprises a fixed chassis (6) and a top fixed sleeve (8) respectively sleeved on two ends of the three-flap mold (5); three fixed rods (7) are connected between the fixed chassis (6) and the top fixed sleeve (8); and a rock sample seepage hole reserved component (9) is also provided on a side of the top fixed sleeve (8) away from the three-flap mold (5).

2. A sample structure for directly producing a rock mass with a fracture surface according to claim 1, characterized in that: The sampling drill bit (1) is threadedly mounted at one end of the first sleeve (2) away from the fixing ring (3).

3. The sample structure for directly producing a rock mass with a fracture surface according to claim 1, characterized in that: The fixing ring (3) is composed of two semicircular arc blocks. A first positioning groove (31) and a first clamping block (32) are respectively provided on both sides of the fixing ring (3). The first clamping block (32) is adapted to the inner side of the first positioning groove (31).

4. The sample structure for directly producing a rock mass with a fracture surface according to claim 1, characterized in that: A mounting groove (51) adapted to the fixing ring (3) is provided in the middle of the three-petal mold (5).

5. The sample structure for directly producing a rock mass with a fracture surface according to claim 1, characterized in that: The three-flap mold (5) is composed of three 120° arc-shaped plates, wherein a second positioning groove (52) and a second clamping block (53) are respectively arranged between two adjacent groups of the 120° arc-shaped plates, and the second clamping block (53) is adapted to the inner side of the second positioning groove (52).

6. The sample structure for directly producing a rock mass with a fracture surface according to claim 1, characterized in that: The rock sample seepage hole reservation component (9) is composed of a fixed disc (90) and a solid cylinder (91), and a hollow cylinder (92) is fixedly connected to one side of the fixed disc (90) close to the solid cylinder (91).

7. A sample structure for directly producing a rock mass with a fracture surface according to claim 6, characterized in that: The outer wall of the solid cylinder (91) is matched with the inner wall of the hollow cylinder (92), and a spring (93) is fixedly connected to one end of the solid cylinder (91) close to the hollow cylinder (92).

8. The sample structure for directly producing a rock mass with a fracture surface according to claim 6, characterized in that: Blind holes matching the fixing rods (7) are provided on the outer wall of the fixing disc (90), and the number of the blind holes is equal to the number of the fixing rods (7).

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