Carbon dioxide phase change fracturing broken rock step structure

Abstract

The utility model provides a carbon dioxide phase change fracturing broken rock step structure, which belongs to the field of rock construction and comprises a first fracturing area and a second fracturing area, the first fracturing area and the second fracturing area are oppositely arranged, the first fracturing area comprises a plurality of first fracturing steps which are sequentially connected from bottom to top, and the second fracturing area comprises a plurality of second fracturing steps which are sequentially connected from bottom to top. The second fracturing area comprises a plurality of second fracturing steps which are sequentially connected from bottom to top, the first fracturing steps and the second fracturing steps are oppositely arranged in a one-to-one correspondence mode, and cutting grooves are formed in each first fracturing step and each second fracturing step. The problem that in the prior art, the rock cracking effect of a liquid carbon dioxide cracking device in a foundation pit is poor is solved. The rock clamp has the technical effects that the good crushing effect is achieved, and the situation that the rock cracking and crushing effect is poor due to the fact that the rock clamp is high in manufacturing use is avoided.

Description

Technical Field

[0001] This utility model relates to the field of rock construction technology, and in particular to a step structure for fracturing rock caused by carbon dioxide phase change. Background Technology

[0002] Liquid carbon dioxide phase change fracturing of rock strata within the foundation pit is a highly efficient rock fracturing technology. It utilizes the property that liquid carbon dioxide rapidly vaporizes and expands when heated, generating enormous pressure to fracture the rock strata.

[0003] Liquid carbon dioxide phase change fracturing technology has been widely used in various fields during foundation pit excavation. For example, in subway foundation pit excavation, this technology can achieve stepped fracturing excavation, improving construction efficiency and quality. However, foundation pits are characterized by only one free surface and no free surfaces around the perimeter, resulting in strong rock clamping effects. This leads to poor rock fracturing effect using liquid carbon dioxide fracturing devices, which is detrimental to rock fracturing and breaking. Utility Model Content

[0004] This invention provides a stepped structure for fracturing rocks using carbon dioxide phase change fracturing, which solves the problem of poor rock fracturing effect of liquid carbon dioxide fracturing devices in foundation pits in the prior art, achieves better fracturing effect, and avoids the situation where the rock fracturing effect is poor due to strong rock clamping effect.

[0005] This utility model provides a carbon dioxide phase change-induced fracturing rock step structure, including a first fracturing zone and a second fracturing zone, which are arranged opposite to each other. The first fracturing zone includes a plurality of first fracturing steps connected sequentially from bottom to top, and the second fracturing zone includes a plurality of second fracturing steps connected sequentially from bottom to top. The plurality of first fracturing steps and the plurality of second fracturing steps are arranged opposite to each other in a one-to-one correspondence, and each first fracturing step and each second fracturing step is provided with a cutting groove.

[0006] According to the carbon dioxide phase change fracturing rock step structure of this utility model, the cutting groove is set as a lateral free surface in the first or second free surface created by carbon dioxide fracturing of the rock, so as to achieve a better fracturing effect and avoid the situation where the rock fracturing effect is poor due to strong rock clamping effect.

[0007] In addition, the carbon dioxide phase transformation-induced fracturing rock step structure of this utility model may also have the following additional technical features:

[0008] In some embodiments of this utility model, a plurality of first fracturing holes are spaced apart on the surface of each first fracturing step, and a plurality of second fracturing holes are spaced apart on the surface of each second fracturing step.

[0009] By adopting the above embodiments, the configuration of opening multiple first fracturing holes on each first fracturing step and multiple second fracturing holes on each second fracturing step enables the simultaneous use of multiple fracturing tubes for rock fracturing when fracturing rock at each first fracturing step or each second fracturing step, thereby increasing the speed of rock fracturing.

[0010] In some embodiments of this utility model, a first protective layer is provided between each first fracture hole and the continuous wall, and a second protective layer is provided between each second fracture hole and the continuous wall.

[0011] By adopting the above embodiments, the setting of the first protective layer and the second protective layer can reduce the impact of phase transformation-induced fracturing rock on the continuous wall and avoid the collapse of the continuous wall during phase transformation fracturing.

[0012] In some embodiments of this utility model, the central axes of the plurality of first fracturing holes in each first fracturing step are coplanar, and the central axes of the plurality of second fracturing holes in each second fracturing step are coplanar.

[0013] By adopting the above embodiments, the first fracturing holes on each first fracturing step and the second fracturing holes on each second fracturing step are all in a row, thereby ensuring the safety of construction.

[0014] In some embodiments of this utility model, the diameter of each first rupture hole and the diameter of each second rupture hole are between 110 mm and 130 mm.

[0015] In some embodiments of this utility model, the height of each first fracturing step and each second fracturing step is 3 to 6 meters.

[0016] In some embodiments of this utility model, the angle of the step slope of each first fracturing step and the angle of the step slope of each second fracturing step are both between 60 degrees and 90 degrees.

[0017] By adopting the above embodiments, the angle of the step slope of each first fracturing step and the angle of the step slope of each second fracturing step are set between 60 degrees and 90 degrees, which can avoid the result that the resistance line at the bottom of the fracturing hole is too large, making it impossible for the rock to fracture.

[0018] In some embodiments of this utility model, the cross-sectional shape of the cutting groove is trapezoidal.

[0019] In some embodiments of this utility model, the distance between two adjacent first rupture holes and the distance between two adjacent second rupture holes are both between 1.7 meters and 2.0 meters.

[0020] By adopting the above embodiments, a better rock fracturing and breaking effect is ensured, and the waste of fracturing tubes is avoided.

[0021] In some embodiments of this utility model, the thickness of both the first protective layer and the second protective layer is greater than 1.5 μm.

[0022] By adopting the above embodiments, limiting the thickness of the first protective layer and the second protective layer can prevent damage to the continuous wall when it cracks and breaks, thus ensuring construction safety.

[0023] In summary, this application includes the following beneficial technical effects: by setting the cutting groove to create a lateral free surface in the first or second free surface of the carbon dioxide-induced rock fracturing, a better fracturing effect can be achieved, avoiding the situation where the rock fracturing effect is poor due to the strong rock clamping effect. Attached Figure Description

[0024] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0025] Figure 1 A schematic diagram of a carbon dioxide phase change-induced fracturing rock step structure according to some embodiments of the present invention is shown.

[0026] Figure 2 A schematic diagram of the cutting groove of a carbon dioxide phase change-induced fracturing rock step structure according to some embodiments of the present invention is shown.

[0027] Figure 3 A schematic diagram illustrating the change in the resistance line of a carbon dioxide phase change-induced fracturing rock step structure according to some embodiments of the present invention is shown.

[0028] Figure 4 The diagram schematically illustrates the structure of the first and second fracturing zones of a carbon dioxide phase change-induced fracturing rock step structure according to some embodiments of the present invention.

[0029] Figure label:

[0030] 1. First cracking zone; 12. First protective layer; 13. First reinforced concrete beam; 14. First cracking hole; 15. First cracking step; 2. Second cracking zone; 22. Second protective layer; 23. Second reinforced concrete beam; 24. Second cracking hole; 25. Second cracking step; 3. Cutting groove; 31. First free surface; 32. Second free surface; 5. Lifting pipe; 6. Cracking pipe; 7. Step slope; 8. Continuous wall. Detailed Implementation

[0031] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0032] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “” used herein may also indicate the inclusion of the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated, unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0033] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0034] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may also be rotated 90 degrees or in other orientations, and the spatial relative descriptors used in the text will be interpreted accordingly.

[0035] like Figures 1 to 4 As shown, according to an embodiment of the first aspect of this utility model, a carbon dioxide phase change-induced fracturing rock step structure is proposed, including a first fracturing zone 1 and a second fracturing zone 2, which are arranged opposite to each other. The first fracturing zone 1 includes a plurality of first fracturing steps 15 connected sequentially from bottom to top, and the second fracturing zone 2 includes a plurality of second fracturing steps 25 connected sequentially from bottom to top. The plurality of first fracturing steps 15 and the plurality of second fracturing steps 25 are arranged opposite to each other in a one-to-one correspondence, and each first fracturing step 15 and each second fracturing step 25 is provided with a cutting groove 3.

[0036] In the above embodiments, it should be noted that when rock crushing is carried out, carbon dioxide phase change fracturing construction is carried out alternately on multiple first fracturing steps 15 of the first fracturing zone 1 and multiple second fracturing steps 25 of the second fracturing zone 2 to reduce the disturbance effect of phase change fracturing on the continuous wall 18 at both ends of the foundation pit. The two sides of the cutting groove 3 are the first free surface 31 and the second free surface 32, respectively.

[0037] A first reinforced concrete beam 13 is provided above the first cracking zone 1, and both ends of the first reinforced concrete beam 13 are connected to the diaphragm wall 8. A second reinforced concrete beam 23 is provided above the second cracking zone 2, and both ends of the second reinforced concrete beam 23 are connected to the diaphragm wall 8.

[0038] The technical effect achieved by the above embodiment is that by setting the cutting groove 3, a lateral free surface is created in the first free surface 31 or the second free surface 32 of the carbon dioxide fracturing rock, so as to achieve a better crushing effect and avoid the situation that the rock fracturing effect is poor due to the strong rock clamping effect.

[0039] Optional, such as Figure 1As shown, each first fracture step 15 has a plurality of first fracture holes 14 spaced apart on its surface, and each second fracture step 25 has a plurality of second fracture holes 24 spaced apart on its surface.

[0040] In the above optional embodiments, it should be noted that when rock is broken on one of the first fracturing steps 15 or one of the second fracturing steps 25, at least one fracturing tube 6 and a lifting tube 5 are provided in each of the multiple fracturing holes 14 on the corresponding first fracturing step 15, and the lifting tube 5 is located above the corresponding fracturing tube 6.

[0041] The lengths of the minimum resistance line W of the fracturing tube 6 in each first fracturing hole 14 and the minimum resistance line W of the fracturing tube in each second fracturing hole 24 are both between 1.5m and 2.3m.

[0042] Each time a cracking hole is drilled for the corresponding first cracking step 15 or second cracking step 25, the minimum resistance line of the first cracking hole 14 or the second cracking hole 15 closest to the diaphragm wall 8 should be equal to 1.5m, so as to ensure that as much cracking energy as possible is released from the free surface, reducing the proportion of energy transmitted into the diaphragm wall 8 from the corresponding first protective layer 12 or the corresponding second protective layer 22, thereby weakening the impact of cracking vibration on the diaphragm wall 8.

[0043] Since the rock strata become more compacted and stronger as you go deeper into the foundation pit, the minimum resistance line should be appropriately reduced as the rock strata depth increases. That is, the lengths of the minimum resistance lines W of the multiple first fracture steps 15 and the multiple second fracture steps 25 gradually decrease from top to bottom.

[0044] The beneficial effects of the above optional embodiments are as follows: by setting up multiple first fracturing holes 14 on each first fracturing step 15 and multiple second fracturing holes 24 on each second fracturing step 25, multiple fracturing tubes 6 can be used simultaneously for fracturing when each first fracturing step 15 or each second fracturing step 25 is fracturing rock, thereby increasing the speed of rock fracturing.

[0045] Optional, such as Figure 1 As shown, a first protective layer 12 is provided between each first fracture hole 14 and the diaphragm wall 8, and a second protective layer 22 is provided between each second fracture hole 24 and the diaphragm wall 8.

[0046] In the above optional embodiments, it should be noted that both the first protective layer 12 and the second protective layer 22 are rock layers.

[0047] The beneficial effects of the above optional embodiments are as follows: by setting the first protective layer 12 and the second protective layer 22, the influence of phase transformation-induced fracturing rock on the continuous wall 8 can be reduced, and the collapse of the continuous wall 8 during phase transformation-induced fracturing can be avoided.

[0048] Optional, such as Figure 1 As shown, the central axes of the plurality of first fracturing holes 14 in each first fracturing step 15 are coplanar, and the central axes of the plurality of second fracturing holes 24 in each second fracturing step 25 are coplanar.

[0049] In the above optional embodiments, it should be noted that the number of first fracturing holes 14 on each first fracturing step 15 is 5 to 6 and the first fracturing holes 14 are only opened in one row, and the number of second fracturing holes 24 on each second fracturing step 25 is 5 to 6 and the second fracturing holes 24 are only opened in one row to ensure absolute safety of construction.

[0050] The beneficial effects of the above optional embodiments are as follows: the central axes of the plurality of first crack-causing holes 14 on each first crack-causing step 15 are coplanar, and the central axes of the plurality of second crack-causing holes 24 on each second crack-causing step 25 are coplanar, so that the first crack-causing holes 14 on each first crack-causing step 15 and the second crack-causing holes 24 on each second crack-causing step 25 are all in a row, thereby ensuring the safety of construction.

[0051] Optional, such as Figure 1 and Figure 3 As shown, the diameter of each first rupture hole 14 and the diameter of each second rupture hole 24 are between 110 mm and 130 mm.

[0052] Optional, such as Figure 1 and Figure 4 As shown, the height of each first fracturing step 15 and each second fracturing step 25 is between 3 meters and 6 meters. The angle of the step slope 7 of each first fracturing step 15 and the angle of the step slope 7 of each second fracturing step 25 are both between 60 degrees and 90 degrees.

[0053] In the above optional embodiments, it should be noted that, preferably, the angle of the step slope 7 of each first fracturing step 15 and the angle of the step slope 7 of each second fracturing step 25 are 60 degrees to 80 degrees or 80 degrees to 90 degrees. If the rock strength is too hard and neither a liquid breaker nor a fracturing hook can increase the step slope angle, the first fracturing hole 14 and the second fracturing hole 15 can be arranged by using an inclined drilling method during drilling, and the inclination of the hole should be as consistent as possible with the step slope.

[0054] The beneficial effect of the above optional embodiments is that by setting the angle of the step slope 7 of each first fracturing step 15 and the angle of the step slope 7 of each second fracturing step 25 to be between 60 degrees and 90 degrees, the result that the bottom resistance line of the fracturing hole is too large can be avoided, which would prevent the rock from fracturing.

[0055] Optional, such as Figure 2As shown, the cross-sectional shape of the cutting groove 3 is trapezoidal.

[0056] In the above optional embodiments, it should be noted that the cross-sectional shape of the cutting groove 3 is an isosceles trapezoid, and the angles of the two sides are between 65 degrees and 75 degrees.

[0057] The advantages of the above optional embodiments are: by setting the cutting groove 3 to be trapezoidal, a first free surface 31 and a second free surface 32 can be created for the subsequent carbon dioxide-induced fracturing of the rock, so as to achieve a better fracturing effect.

[0058] Optional, such as Figure 1 As shown, the distance between two adjacent first fracture holes 14 and the distance between two adjacent second fracture holes 24 are both between 1.7 meters and 2.0 meters.

[0059] The advantages of the above optional embodiments are that the distance between two adjacent first fracturing holes 14 and the distance between two adjacent second fracturing holes 24 are both set between 1.7 meters and 2.0 meters, which can ensure a better rock fracturing and breaking effect and avoid the waste of fracturing tubes 6.

[0060] Optional, such as Figure 1 As shown, the thickness of the first protective layer 12 and the thickness of the second protective layer 22 are both greater than 1.5m.

[0061] The advantages of the above optional embodiments are: the limited thickness of the first protective layer 12 and the second protective layer 22 can prevent damage to the continuous wall 8 when cracking and breaking, thus ensuring construction safety.

[0062] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A stepped structure of carbon dioxide phase transformation-induced fracturing rock, characterized in that, It includes a first crack-causing zone (1) and a second crack-causing zone (2), which are arranged opposite to each other. The first crack-causing zone (1) includes a plurality of first crack-causing steps (15) connected sequentially from bottom to top. The second crack-causing zone (2) includes a plurality of second crack-causing steps (25) connected sequentially from bottom to top. The plurality of first crack-causing steps (15) and the plurality of second crack-causing steps (25) are arranged opposite to each other in a one-to-one correspondence. Each first crack-causing step (15) and each second crack-causing step (25) is provided with a cutting groove (3).

2. The carbon dioxide phase transformation-induced fracturing and broken rock step structure according to claim 1, characterized in that, Each of the first fracture-inducing steps (15) has a plurality of first fracture-inducing holes (14) spaced apart on its surface, and each of the second fracture-inducing steps (25) has a plurality of second fracture-inducing holes (24) spaced apart on its surface.

3. The carbon dioxide phase transformation-induced fracturing and broken rock step structure according to claim 2, characterized in that, A first protective layer (12) is provided between each of the first rupture holes (14) and the continuous wall (8), and a second protective layer (22) is provided between each of the second rupture holes (24) and the continuous wall (8).

4. The carbon dioxide phase transformation-induced fracturing and broken rock step structure according to claim 2, characterized in that, The central axes of the plurality of first fracturing holes (14) of each first fracturing step (15) are coplanar, and the central axes of the plurality of second fracturing holes (24) of each second fracturing step (25) are coplanar.

5. The carbon dioxide phase transformation-induced fracturing and broken rock step structure according to claim 2, characterized in that, The diameter of each of the first rupture holes (14) and the diameter of each of the second rupture holes (24) are between 110 mm and 130 mm.

6. The carbon dioxide phase transformation-induced fracturing and broken rock step structure according to claim 1, characterized in that, The height of each of the first fracturing step (15) and each of the second fracturing steps (25) is 3 to 6 meters.

7. The carbon dioxide phase transformation-induced fracturing and broken rock step structure according to claim 1, characterized in that, The angle of the step slope (7) of each of the first crack-causing steps (15) and the angle of the step slope (7) of each of the second crack-causing steps (25) are both between 60 degrees and 90 degrees.

8. The carbon dioxide phase transformation-induced fracturing and broken rock step structure according to claim 1, characterized in that, The cross-sectional shape of the cutting groove (3) is trapezoidal.

9. The carbon dioxide phase transformation-induced fracturing and broken rock step structure according to claim 4, characterized in that, The distance between two adjacent first rupture holes (14) and the distance between two adjacent second rupture holes (24) are both between 1.7 meters and 2.0 meters.

10. The carbon dioxide phase transformation-induced fracturing and broken rock step structure according to claim 3, characterized in that, The thickness of the first protective layer (12) and the thickness of the second protective layer (22) are both greater than 1.5m.

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