Dam core wall washout test device for tension fracture forming

Abstract

The utility model relates to the technical field of earth and rockfill dam engineering tests, in particular to a dam core wall washout test device with a tensioning crack forming function. Comprising a test box, a wedge-shaped fracture forming plate and screws, a water inlet is formed in the head end of the test box, and a water outlet is formed in the tail end of the test box; a soil sample is compacted in the test box in a layered manner, the tail end of the wedge-shaped fracture-forming plate is horizontally inserted into a soil sample fracture-forming area, and the head end is exposed outside the soil sample; the screw is in threaded connection with the test box, and one end, extending into the test box, of the screw abuts against the head end of the wedge-shaped fracture forming plate. According to the utility model, the crack is formed in a tensioning manner, so that the interference on the crack caused by manual extraction of a crack forming plate is avoided; the purpose of controlling the depth and the opening degree of the crack is achieved by adjusting the screwing-in depth of the screw according to the force applied by the thread; and the crack is randomly formed and irregular, so that the problem that the crack surface is too flat after the crack is formed is avoided, and the crack is more suitable for the inducement of tensile stress crack forming.

Description

TECHNICAL FIELD

[0001] The utility model relates to earth and rockfill dam engineering test technical field, concretely to a dam core wall scouring test device of tensioning seam making. BACKGROUND

[0002] As a common water conservancy project, the stability of the core wall is crucial to the safety of the whole dam body, under the comprehensive action of complex factors such as differential settlement, arch effect and hydraulic embedding, the core wall anti-seepage body is easy to form cracks under tension. The generation and development of core wall cracks may lead to dam seepage, and further cause scouring damage, threatening the safety of the dam body. At present, the research on the scouring of the core wall cracks of the earth and rockfill dam mostly relies on field observation and the research on the filter material, and lacks effective test devices to simulate the generation of cracks. The commonly used crack simulation method is rectangular seam, and the seam making method is mostly pre-embedded seam making method. The specific method is as follows:

[0003] 1) When preparing the sample, a certain thick seam forming plate is placed in the scouring instrument, the soil material is poured into the two sides of the seam forming plate, then the soil material is compacted in layers to the controlled density, and then the prefabricated filter material is placed at the rear of the soil sample.

[0004] 2) In order to ensure that the cracks are not disturbed, the pre-placed seam forming plate needs to be pulled out carefully to form a through crack.

[0005] 3) After the sample is loaded, the water head is applied, and the water head and water discharge of the pressure measuring tube are recorded after the water head is stable.

[0006] This method avoids the disturbance of the surrounding soil body caused by drilling and seam making after the soil sample is compacted and formed, reduces the change of the initial density of the sample, but ignores the influence of the seam forming method, needs to control the force when pulling out the seam, and is not easy to control. Since the pre-placed seam forming plate is pulled out gently, the smooth seam surface cannot realize the stress release, which violates the inducement of the tensile stress seam making, and is inconsistent with the actual situation. UTILITY MODEL CONTENTS

[0007] In order to solve at least one of the technical problems in the background art, the utility model provides a dam core wall scouring test device of tension seam making, which adopts tension seam making, avoids the disturbance of the artificial extraction of the seam forming plate to the cracks, relies on the screw force, adjusts the screwing depth of the screw, and achieves the purpose of controllable crack depth and opening. The random and irregular cracks avoid the problem of too smooth seam surface after seam forming, and are more consistent with the inducement of the tensile stress seam making.

[0008] In order to achieve the above purpose, the utility model provides a kind of dam core wall scouring test device of tensioning and jointing, comprising: test box, wedge jointing plate and screw, the first end of test box is provided with inlet, tail end is provided with outlet;The test box is layered and compacted in soil sample, the tail end of wedge jointing plate is inserted into the jointing area of soil sample, and the first end is exposed outside soil sample;Screw is threadedly connected on the test box, and the end inserted into the test box is abutted on the first end of wedge jointing plate.

[0009] Further, the test box is installed with water permeable plate, the water permeable plate is located at the first end of soil sample, and a buffer layer is arranged in the cavity between the first end of water permeable plate and the inner wall of test box.

[0010] Further, the cavity between the tail end of soil sample and the inner wall of test box is filled with filter material.

[0011] Further, the thickness of wedge jointing plate is 2mm.

[0012] Further, it further includes distillation tank, the distillation tank is connected with inlet by pipeline, and valve is installed on pipeline.

[0013] Further, the material of test box is acrylic plate.

[0014] The utility model has the advantages that:

[0015] The utility model provides a kind of dam core wall scouring test device of tensioning and jointing, by setting wedge jointing plate, adopt tensioning form jointing, avoid the interference of artificial extraction jointing plate to crack;According to screw force, by adjusting the screwing depth of screw, reach the purpose that crack depth, opening degree is controllable;Crack is formed randomly and irregularly, avoid the problem that jointing surface is too smooth after jointing, more comply with the inducement of tensile stress jointing. ACCURACY OF DRAWINGS

[0016] Figure 1 The utility model provides structure schematic diagram.

[0017] In the drawing: 1-test box;2-wedge jointing plate;3-screw;4-inlet;5-outlet;6-soil sample;7-water permeable plate;8-buffer layer;9-filter material;10-distillation tank;11-crack. DETAILED DESCRIPTION

[0018] The technical scheme in the embodiment of the utility model is described clearly and completely below, obviously, the described embodiment is only a part of the embodiment of the utility model, not all. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the scope of the utility model protection.

[0019] It should be noted that the terms "first", "second" and the like in the description and in the claims of the present application and the above-described accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular sequential or chronological order. It should be understood that the data thus used can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0020] In the present application, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "transverse", "longitudinal" and the like is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not intended to limit the indicated devices, elements or components to have a particular orientation, or to be constructed and operated in a particular orientation.

[0021] In addition, in addition to being used to indicate the orientation or positional relationship, the above-mentioned partial terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in the present application can be understood according to the specific circumstances.

[0022] In addition, the terms "mounting", "setting", "provided with", "connecting", "connected", "sleeved" should be broadly understood. For example, it can be a fixed connection, a detachable connection, or a monolithic structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or an internal communication between two devices, elements or components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0023] As Figure 1 The utility model provides a kind of dam core wall scouring test device of tensioning seam making, can ensure the change condition of crack etc. part is observed clearly, comprising: test box 1, wedge-shaped seam making plate 2 and screw 3, the first end of test box 1 is provided with water inlet 4, tail end is provided with water outlet 5;The test box 1 is layered and compacted in soil sample 6, the tail end of wedge-shaped seam making plate 2 is inserted into soil sample seam making area horizontally, and the first end is exposed to the outside of soil sample;Screw 3 is threadedly connected on the test box 1, and the end inserted into the test box 1 is abutted on the first end of wedge-shaped seam making plate 2.

[0024] Further optimize technical scheme, the test box 1 install water permeable plate 7, water permeable plate 7 is located at the first end of soil sample 6, the cavity between the first end of water permeable plate 7 and the inner wall of test box 1 is provided with buffer layer 8. By setting buffer layer 8, the water flow velocity can be slowed down, and the impact on the soil sample can be reduced.

[0025] Further optimize technical scheme, the cavity between the tail end of soil sample 6 and the inner wall of test box 1 is filled with filter material 9. By setting filter material 9, soil loss can be effectively prevented, the structure of the soil sample can be protected, and the stability of the soil body can be ensured.

[0026] Further optimize technical scheme, the thickness of the wedge-shaped jointing plate 2 is 2mm, so as to facilitate the control of the depth and opening of the crack 11.

[0027] Further optimize technical scheme, it also includes distillation tank 10, distillation tank 10 is connected with water inlet 4 through pipeline, and valve is installed on the pipeline.

[0028] Further optimize technical scheme, the material of test box 1 is acrylic plate, which is low in manufacturing cost and durable.

[0029] The utility model provides a kind of dam core wall scouring test device of tension jointing, by setting wedge-shaped jointing plate, adopt tension form jointing, avoid the interference of artificial extraction jointing plate to crack;According to thread force, by adjusting the screwing depth of screw, the purpose of controllable crack depth and opening is achieved;Crack is randomly formed and irregular, avoid the problem that jointing surface is too smooth after jointing, more in line with the inducement of tensile stress jointing.

[0030] The working principle of the utility model is as follows:

[0031] (1) in test box, first, soil sample is layered and compacted to a certain density, then wedge-shaped jointing plate (2mm thick) is horizontally placed in jointing area, and soil sample is continuously compacted to control height.

[0032] (2) after sample loading is completed, wedge-shaped jointing plate is stressed by screwing screw a certain number of turns, and crack depth and opening are controlled to test requirements;

[0033] (3) open valve on pipeline connected with distillation tank to carry out test, and record pressure pipe water head and water discharge after water flow is stable.

[0034] The above is only the preferred embodiment of the utility model, and does not limit the technical range of the utility model, so any slight modification, equivalent change and modification made according to the technical essence of the utility model to the above embodiment still belongs to the range of the technical scheme of the utility model.

Claims

1. A device for testing the scouring of a tensioned jointed core wall of a dam, characterized in that, The utility model relates to a test box, a wedge-shaped jointing plate and a screw, the test box is provided with a water inlet at the head end and a water outlet at the tail end, the test box is divided into layers and the soil sample is compacted, the tail end of the wedge-shaped jointing plate is horizontally inserted into the jointing area of the soil sample, and the head end is exposed outside the soil sample, the screw is screwed on the test box, and the end inserted into the test box abuts against the head end of the wedge-shaped jointing plate. A water-permeable plate is installed in the test box, the water-permeable plate is located at the head end of the soil sample, and a buffer layer is arranged in the cavity between the head end of the water-permeable plate and the inner wall of the test box.

2. The device for testing the scour of a tensioned jointed dam core wall according to claim 1, wherein, The cavity between the tail end of the soil sample and the inner wall of the test box is filled with a filter material.

3. A device for testing the scouring of a large dam core wall constructed by tensioning and sewing as claimed in claim 2, wherein The thickness of the wedge-shaped jointing plate is 2mm.

4. The device for testing the scour of a tensioned jointed dam core wall according to claim 1 or 3, characterized in that, A distillation water tank is further included, the distillation water tank is connected with the water inlet through a pipeline, and a valve is installed on the pipeline.

5. A device for testing the scouring of a large dam core wall constructed by tensioning and sewing as claimed in claim 1, wherein The material of the test box is acrylic plate.

6. A device for testing the scouring of a large dam core wall constructed by tensioning and sewing according to claim 1, wherein ​

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