CN205879747U - Alternately crack seepage flow test device of fine and close rock mass simulates - Google Patents

Abstract

The utility model discloses a test device for simulating cross-fissure seepage of dense rock mass, which comprises a cross-fissure seepage module, including a circular first glass plate and two second glass plates fixed together, the first glass plate is located on the Between the two second glass plates, the surrounding edges of the first glass plate and the two second glass plates are sealed; the first glass plate has at least two intersecting slits, and each slit is Corresponding water inlets and water outlets are respectively formed at the two ends corresponding to the two ends of the edge of the first glass plate. The utility model can simulate more complex intersecting fissures. In addition, compared with the prior art, the accuracy of hydraulic gradient calculation results can be greatly improved, thereby improving the accuracy of test results. The utility model can realize the simulation of seepage in intersecting fissures of dense rock mass, has great significance for studying the law and mechanism of intersecting fissures in dense rock mass, and has the advantages of simple structure, economical saving, wide applicability and the like.

Description

A test device for simulating cross-fissure seepage in tight rock mass

technical field

The utility model relates to the field of physical model tests of fissure rock mass seepage, in particular to a simulated compact rock mass intersecting fissure seepage test device for the study of fluid seepage mechanism in compact rock mass intersecting fissures.

Background technique

There are discontinuities/cracks in natural rock mass, and the existence of these discontinuities provides channels for the migration of water or other harmful substances in the rock mass. For dam and slope engineering, seepage of confined groundwater in the discontinuous surface in the form of osmotic pressure or head pressure is an important cause of slope engineering instability; for underground oil storage and nuclear power plant foundations, oil or Harmful pollutants such as nuclear substances are easy to migrate and diffuse through discontinuous surfaces in the rock mass, thereby causing great pollution to the surrounding environment. In addition, in tight rock mass, such as granite and sedimentary rock, the migration of fluid is basically only along the discontinuous surface. The safety assessment of (storage) projects is of great significance.

The utility model patent with the application number CN201310657945.6 introduces a method of engraving cracks of a certain depth on the stencil to simulate cracks. This method can only use the means of manually scribing cracks, and cannot simulate the natural fragmentation of the stencil. On the other hand, artificial characterization cannot guarantee the same depth of the entire fissure, and the accuracy of parameters such as the shape and depth of artificial fissures is not easy to control.

The utility model patent with the application number CN201210562580.4 and the utility model patent with the application number CN201410588213.0 respectively introduce the device and method for crack seepage simulation using real rock or concrete test blocks, but both devices can only simulate Single fractures, but not more complex intersecting fractures.

In the sixth issue of "Rock and Soil Mechanics" in 2015 titled "Calculation of Hydraulic Opening of Intersecting Fractures and Research on Nonlinear Hydraulic Characteristics", the author Liu Richeng et al. introduced a test method for calculating the hydraulic opening of intersecting fractures, but The intersecting fissures are prefabricated in the rectangular glass plate. Since the distance from the center of the rectangular glass plate to each water outlet is different, the hydraulic gradient of different seepage paths will be different when there are multiple water outlets, so it can only be determined by an approximate average method. , the accuracy of hydraulic gradient calculation results is poor.

To sum up, the devices in the prior art for rock mass fracture seepage simulation cannot simulate more complex intersecting fractures. In addition, the current research on cross-fracture seepage uses rectangular glass. When there are multiple seepage paths, it is difficult to ensure that the hydraulic gradient along different seepage paths is the same, resulting in poor accuracy of hydraulic gradient calculation results.

Utility model content

The purpose of this utility model is to provide a test device for simulating cross-crack seepage of dense rock mass, to realize the simulation of water seepage in dense rock mass, so as to provide reference for the study of the law and mechanism of water seepage in the cracks of compact rock mass, which can simulate More complex intersecting fractures improve the accuracy of hydraulic gradient calculation results.

In order to realize above-mentioned utility model purpose, the technical scheme that the utility model adopts is:

A test device for simulating cross-fissure seepage in tight rock mass, comprising:

Cross-fissure infiltration module, which includes a circular first glass plate and two second glass plates fixed together, the first glass plate is located between the two second glass plates, and the first glass plate The plate is sealed around the edges where the two second glass plates are in contact with each other;

Wherein, the first glass plate has at least two intersecting slits, and the two ends of each slit respectively form corresponding water inlets and water outlets at the two ends corresponding to the edge of the first glass plate.

Specifically, the diameters of the two second glass plates are the same, and the diameter of the first glass plate is larger than the diameter of the two second glass plates, thereby forming a protrusion protruding from the two second glass plates. The water outlet, the water inlet and the water outlet are respectively located on the protrusion.

Further, each of the water inlet and water outlet is clamped and connected to a clampable inflow/outflow container.

Specifically, the clampable inflow/outflow container includes a base body and a clamping portion for connecting the base body to the protrusion, and the base body is provided with an input/output channel for liquid communication;

At each of the water inlets, one end of the input/output channel is connected to the water inlet, and the other end is connected to a water inlet conduit, and a first valve is provided on the water inlet conduit;

At each of the water outlets, one end of the input/output channel is connected to the water outlet, and the other end is connected to a water outlet conduit, and a second valve is provided on the water outlet conduit;

Wherein, the shape of the clamping part is adapted to the protruding part, so as to clamp the clampable inflow/outflow container on the protruding part of the intersecting fissure seepage module, and the clamping part is compatible with the protruding part. The edges where the protruding parts contact are sealed.

Further, a miniature osmometer is embedded on the substrate of the clampable inflow/outflow container.

Further, the clamping part of the clampable inflow/outflow container is in the shape of a rectangular groove, and a part of the protruding part of the first glass plate extends into the rear edge of the groove for sealing.

Further, the two second glass plates and the first glass plate are aligned with the center of the circle and pressed together, and sealant is applied to the edges where the three glass plates are in contact with each other.

Further, the cracks in the first glass plate are completely penetrated along the thickness direction of the first glass plate.

Further, the at least two intersecting cracks on the first glass plate are cracks with predetermined parameters or cracks naturally formed by broken glass.

Compared with the prior art, the utility model has the following beneficial effects:

The test device for simulating cross-fissure seepage of dense rock mass provided by the utility model has a cross-fissure seepage module, which includes a circular first glass plate and two second glass plates fixed together, and the first glass plate is located on the Between the two second glass plates, and the surrounding edges where the first glass plate and the two second glass plates are in contact with each other are sealed; wherein, the first glass plate has at least two intersecting cracks, Two ends of each slit respectively form corresponding water inlets and water outlets at the two ends corresponding to the edge of the first glass plate. In this way, since the first glass plate has at least two intersecting fissures, the utility model realizes the simulation of water seepage in the compact rock mass and provides a reference for studying the law and mechanism of water seepage in the fissures of the compact rock mass. It can simulate more complex intersecting fractures. In addition, a circular glass plate is used to form a cross-fissure seepage module, and the distance from the center of the circular glass plate to any point on the circumference is the same, so the hydraulic gradient under different seepage paths is the same, so that the water flow at the inlet/outlet can be The hydraulic gradient can be accurately calculated based on the pressure. Compared with the prior art, the accuracy of hydraulic gradient calculation results can be greatly improved, thereby improving the accuracy of test results.

Description of drawings

Fig. 1 is the schematic diagram of the test device for simulating cross-fissure seepage of tight rock mass;

Fig. 2 is a schematic diagram of a clampable inflow/outflow container;

Fig. 3 is a schematic diagram of a cross-fracture seepage module.

detailed description

Below in conjunction with accompanying drawing, the utility model is described further.

The embodiment of the utility model provides a test device for simulating cross-fissure seepage of dense rock mass, including a cross-fissure seepage module, which includes a circular first glass plate and two second glass plates fixed together, the first glass The plate is located between the two second glass plates, and the surrounding edges of the first glass plate and the two second glass plates are sealed; wherein, the first glass plate has at least two For the intersecting slits (two are used as an example in this embodiment), the two ends of each slit form corresponding water inlets and water outlets at the corresponding ends of the edge of the first glass plate.

Specifically, the diameters of the two second glass plates are the same, and the diameter of the first glass plate is larger than the diameter of the two second glass plates, thereby forming a protrusion protruding from the two second glass plates. The water outlet, the water inlet and the water outlet are respectively located on the protrusion. Each of the water inlets and water outlets is respectively clamped and connected to a clampable inflow/outflow container to realize the inflow and outflow of water.

Specifically, the clampable inflow/outflow container includes a base body and a clamping portion for connecting the base body to the protrusion, and the base body is provided with an input/output channel for liquid communication; At each of the water inlets, one end of the input/output channel is connected to the water inlet, and the other end is connected to the water inlet conduit, and the water inlet conduit is provided with a first valve; at each of the water outlets , one end of the input/output channel is connected to the water outlet, and the other end is connected to the water outlet conduit, and the second valve is provided on the water outlet conduit; wherein, the shape of the clamping part is similar to that of the protruding part adapted to clamp the clampable inflow/outflow container on the protruding part of the cross-fissure infiltration module, and the edge position of the clamping part in contact with the protruding part is sealed.

Further, a miniature osmometer is embedded on the substrate of the clampable inflow/outflow container, which can be connected to a computer to record the internal water pressure.

Further, the clamping part of the clampable inflow/outflow container is in the shape of a rectangular groove, and a part of the protruding part of the first glass plate extends into the rear edge of the groove for sealing.

Further, the two second glass plates and the first glass plate are aligned with the center of the circle and pressed together, and sealant is applied to the edges where the three glass plates are in contact with each other.

Further, the cracks in the first glass plate are completely penetrated along the thickness direction of the first glass plate. The at least two intersecting cracks on the first glass plate are cracks with predetermined parameters or cracks naturally formed by broken glass.

The test device for simulating cross-fissure seepage of dense rock mass provided by the utility model has a cross-fissure seepage module, which includes a circular first glass plate and two second glass plates fixed together, and the first glass plate is located on the Between the two second glass plates, and the surrounding edges where the first glass plate and the two second glass plates are in contact with each other are sealed; wherein, the first glass plate has at least two intersecting cracks, Two ends of each slit respectively form corresponding water inlets and water outlets at the two ends corresponding to the edge of the first glass plate. In this way, since the first glass plate has at least two intersecting fissures, the utility model realizes the simulation of water seepage in the compact rock mass and provides a reference for studying the law and mechanism of water seepage in the fissures of the compact rock mass. It can simulate more complex intersecting fractures. In addition, a circular glass plate is used to form a cross-fissure seepage module, and the distance from the center of the circular glass plate to any point on the circumference is the same, so the hydraulic gradient under different seepage paths is the same, so that the water flow at the inlet/outlet can be The hydraulic gradient can be accurately calculated based on the pressure. Compared with the prior art, the accuracy of hydraulic gradient calculation results can be greatly improved, thereby improving the accuracy of test results.

The utility model is illustrated below in conjunction with accompanying drawings and specific examples.

As shown in Figure 1, a test device for simulating cross-fissure seepage in tight rock mass, including a water inlet 1, a valve 2, four clampable inflow/outflow containers 3, a cross-fissure seepage module 4, a water outlet 5 and an aqueduct 8 (including water inlet conduit and water outlet conduit).

As shown in Figure 2, the clampable inflow/outflow container is a special clip with a hollow structure inside and a rectangular groove-like structure, and a part of the protrusion of the first glass plate extends into the groove Sealed at rear edge. The outside is well sealed except for the mouth of the clip (that is, the clamping part). The mouth of the clip is used to clamp the positions of the two ends of a crack on the glass plate 7 containing cross cracks (corresponding to the water inlet and the water outlet). The opposite end is externally connected to the water guide pipe through the reserved hole, so that water flows from the water source into the crack through the clampable inflow/outflow container 3 . Whether there is water source flowing into/out of the crack in the clampable inflow/outflow container 3 can be controlled by controlling the valve 2 on the aqueduct; the water of the internal water source in the clampable inflow/outflow container 3 can be monitored by the micro osmometer 9 pressure.

As shown in Figure 3, the intersecting crack percolation module 4 is made up of two high-strength glass plates 6 with the same diameter and a circular glass plate 7 containing cross cracks (that is, two intersecting cracks). The size of the glass plate 7 containing cross cracks is (i.e. the diameter) is slightly larger than the high-strength glass plate 6, two high-strength glass plates 6 are respectively placed on both sides of the glass plate 7 containing cross cracks, the three glass plates are aligned with the center of the circle and then pressed tightly and contact each other around the three glass plates Apply sealant to the position where the water only moves inside the crack during the seepage process.

The simulated dense rock intersecting fissure seepage test device of the example of the utility model includes a water inlet 1, a valve 2, four clampable inflow/outflow containers 3, an intersecting fissure seepage module 4, a water outlet 5 and an aqueduct 8. Wherein, the clampable inflow/outflow container 3 is embedded with a micro osmometer 9, and the cross-fissure seepage module 4 is sequentially composed of a high-strength glass plate 6, a glass 7 containing cross-slits, and a high-strength glass plate from top to bottom. 6.

The clampable inflow/outflow container 3 is a special clip, the inside of the clip is hollow, and the outside part is well sealed except the mouth of the clip. The mouth of the clip is used to clamp the position of the end of the crack on the glass plate 7 containing cross cracks. The water guide pipe 8 is externally connected through a reserved hole at the opposite end.

In order to ensure that no leakage occurs when the end of the water flow crack enters the crack, after clamping the glass plate 7 with cross cracks at the clamp mouth of the clampable inflow/outflow container 3, apply sealant on the position where the two are in contact . In order to ensure that the clamp mouth of the clampable inflow/outflow container 3 fits perfectly with the glass plate 7, an elastic material of appropriate size, such as rubber, can be placed between the two as required.

A miniature piezometer 9 is embedded on the grippable inflow/outflow container 3 , and the water pressure inside the grippable inflow/outflow container 3 can be measured through the miniature piezometer 9 .

The intersecting fissure infiltration module 4 is composed of two identical high-strength glass plates 6 and one glass plate 7 containing cross fissures. The size (namely diameter) of the glass plate 7 containing cross fissures is slightly larger than that of the high strength glass plate 6. Put it on both sides of the glass plate 7 containing cross cracks, align the three glass plates with the center of the circle and press them tightly, and apply sealant at the positions where the three glass plates are in contact with each other. In order to prevent the glass plate 7 protruding from the high-strength glass plate 6 edge portion (ie the protrusion) containing cross-cracks to flow into the sealant, you can paste scotch tape in these positions in advance as protection.

The glass plate 7 containing intersecting cracks in this example is an ordinary circular glass plate. The cracks in the glass plate are completely penetrated along the thickness direction. Can be chosen arbitrarily. For cracks with specific parameters, the crack parameters can be digitized first, and according to the digitized results, the glass plate 7 can be cut by the program control water jet to obtain cross cracks with specific parameters; for naturally formed cross cracks, the glass plate 7 can be processed. Physical hits get. When splicing the glass plates 7 containing cross cracks after the cross cracks are made, according to the required mechanical opening of the cross cracks, select splints with the same thickness and place them in the cracks, so as to obtain cross cracks with a certain mechanical opening. Since the seepage in tight rock mass basically only occurs inside the cracks, and the permeability of glass is extremely poor, it is reasonable to use glass to simulate tight rock mass.

The glass plate 7 with intersecting cracks is a circular glass plate, and the distance from the center of the circular glass plate to any point on the circumference is the same, so the hydraulic gradient under different seepage paths is the same, and it can be determined according to the water inlet/outlet Accurately calculated water pressure. If the glass plate 7 adopts other shapes such as rectangles, when there are multiple water outlets at the same time, the same seepage path cannot be guaranteed, and the hydraulic gradients of different paths are also different, so the approximate average method can only be used to calculate the hydraulic gradient of each seepage path. The use of a circular glass plate does not have similar problems, and the accurate hydraulic gradient of different seepage paths can be calculated, thereby improving the accuracy of the test results.

Compared with the prior art, the simulated compact rock mass intersecting fissure seepage test device shown in the utility model has at least the following beneficial effects:

1. The test device for simulating cross-crack seepage in dense rock mass can simulate cross-cracks in rock mass, not limited to a single crack; the method of making cross-cracks is simple, the cost is low, and the forms of cross-cracks are diverse, which can meet various tests Purpose.

2. Through the clampable inflow/outflow container 3, the seepage of the water source from the outside to the crack is realized, and the cross-crack seepage module 4 realizes the seepage of water only inside the cross-crack, and in addition, through the clampable inflow/outflow container 3 and cross-fissure seepage module 4 have well realized the sealing problem of water in the seepage test.

3. In order to improve the precision of cross cracks in the glass plate 7 containing cross cracks, the making of cross cracks includes but is not limited to the following methods: for cracks with specific parameters, the crack parameters can be digitized first, and the water jet can be controlled by a program according to the digital results The glass plate 7 is cut to obtain cross cracks with specific parameters; for naturally formed cross cracks, the glass plate 7 can be physically struck. When splicing the glass plates 7 containing cross cracks after the cross cracks are made, according to the required mechanical opening of the cross cracks, select splints with the same thickness and place them in the cracks, so as to obtain cross cracks with a certain mechanical opening.

4. In order to make the hydraulic gradients on the different seepage paths of the intersecting fissures the same, a circular glass plate is specially selected when selecting the glass plate 7 with intersecting fissures. Since the distance from the center of the circle to any point on the boundary is equal, it can ensure that the lengths of different seepage paths are the same, thereby ensuring that the hydraulic gradients of different seepage paths are also the same, so that each seepage can be accurately calculated according to the water pressure at the inlet/outlet. The hydraulic gradient of the path increases the accuracy of the test results.

5. By controlling the switching status of multiple valves 2, the number and position of water inlets and outlets in cross-fissures can be controlled, so that the combination of water inlets and water outlets during seepage in various cross-fissures can be simulated, which enriches the simulation of different working conditions.

6. The water pressure at the entrance of the crack can be measured by the micro-osmometer 9 embedded in the clampable inflow/outflow container 3, and the water flow can enter the crack with a certain stable water pressure by adjusting the water volume of the water inlet , so that the seepage of cross-fractures can be simulated under the condition of constant water pressure at the fracture inlet.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made. Retouching should also be regarded as the scope of protection of the present utility model.

Claims (9)

1. A test device for simulating cross-fissure seepage of tight rock mass, characterized in that, comprising: Cross-fissure infiltration module, which includes a circular first glass plate and two second glass plates fixed together, the first glass plate is located between the two second glass plates, and the first glass plate The plate is sealed around the edges where the two second glass plates are in contact with each other; Wherein, the first glass plate has at least two intersecting slits, and the two ends of each slit respectively form corresponding water inlets and water outlets at the two ends corresponding to the edge of the first glass plate. 2. The simulated compact rock mass intersecting fracture seepage test device according to claim 1, wherein the diameters of the two second glass plates are the same, and the diameter of the first glass plate is larger than that of the two second glass plates. The diameter of the glass plate forms a protruding part protruding from the two second glass plates, and the water inlet and water outlet are respectively located on the protruding part. 3. The device for simulating cross-fissure seepage in dense rock mass according to claim 2, characterized in that, each of the water inlets and water outlets is respectively clamped and connected to a clampable inflow/outflow container. 4. The device for simulating cross-fissure seepage in tight rock mass according to claim 3, characterized in that, the clampable inflow/outflow container comprises a base body and a socket for connecting the base body to the protruding part. A clamping part, the base body is provided with an input/output channel for liquid communication; At each of the water inlets, one end of the input/output channel is connected to the water inlet, and the other end is connected to a water inlet conduit, and a first valve is provided on the water inlet conduit; At each of the water outlets, one end of the input/output channel is connected to the water outlet, and the other end is connected to a water outlet conduit, and a second valve is provided on the water outlet conduit; Wherein, the shape of the clamping part is adapted to the protruding part, so as to clamp the clampable inflow/outflow container on the protruding part of the intersecting fissure seepage module, and the clamping part is compatible with the protruding part. The edges where the protruding parts contact are sealed. 5 . The device for simulating cross-fissure seepage in tight rock mass according to claim 4 , wherein a miniature piezometer is embedded on the substrate of the clampable inflow/outflow container. 6 . 6. The simulated compact rock mass intersecting fracture seepage test device according to claim 4 or 5, characterized in that, the clamping portion of the clampable inflow/outflow container is in a rectangular groove-like structure, and the first A part of the protruding portion of the glass plate protrudes into the rear edge of the groove for sealing. 7. The simulated dense rock mass intersecting fracture seepage test device according to claim 6, characterized in that, the two second glass plates and the first glass plates are aligned with the center of the circle and then compressed and placed on the three glass plates Apply sealant to the edges where they touch each other. 8. The device for simulating cross-fissure seepage in dense rock mass according to claim 7, characterized in that the cracks in the first glass plate are completely penetrated along the thickness direction of the first glass plate. 9. The simulated compact rock mass intersecting fracture seepage test device according to claim 8, characterized in that, at least two intersecting cracks on the first glass plate are cracks with predetermined parameters or naturally formed by glass fragmentation cracks.