A test device and method for simulating cracks in the surface layer of an airport pavement

Abstract

The application discloses a test device and method for simulating airport pavement surface layer cracks, which comprises three parts of test block I, test block II and test block III. The three parts are combined in different forms, 32 kinds of surface layer cracks with different widths, different heights, open or closed, vertical or inclined in the airport pavement can be simulated, and various indoor simulation tests can be carried out.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of road engineering, and particularly relates to a test device and method for simulating cracks in the surface layer of an airport pavement. BACKGROUND

[0002] A typical airport pavement structure in China is divided into three parts from top to bottom, namely a cement concrete surface layer, a cement stabilized macadam base layer and a soil base. Under the action of environmental factors and aircraft loads, various cracks often exist in the surface layer of the airport pavement, affecting the service life and operation safety of the airport pavement, and various studies need to be conducted. According to the direction and shape of the cracks, the common cracks in the airport pavement can be divided into vertical cracks or inclined cracks, and according to whether the cracks develop to the top surface of the surface layer, the common cracks in the airport pavement can be divided into open cracks or closed cracks, and the width and height of the cracks are also important geometric parameters of the cracks. In order to simulate various cracks in the surface layer of the airport pavement in the test while reducing the test cost, a test device for the cracks in the surface layer of the airport pavement can be developed. SUMMARY

[0003] The present application is proposed to solve the above problems, and provides a test device and method for simulating cracks in the surface layer of an airport pavement, which comprises three parts, namely a test block I, a test block II and a test block III. The three parts are combined in different forms, and can simulate 32 kinds of surface layer cracks in the airport pavement with different widths, different heights, open or closed, vertical or inclined, for carrying out various indoor simulation tests.

[0004] Technical scheme: In order to achieve the purpose of the present application, the technical scheme adopted by the present application is as follows:

[0005] A test device for simulating cracks in the surface layer of an airport pavement, comprising:

[0006] The test block I has a Г-shaped front and rear through groove from the top surface downward, the through groove is in the shape of Г in the top view of the test block I, the through groove is divided into three inclined quadrangular prism regions A, B and C with the same shape, the upper left corner region of the through groove in the top view of the test block I is the A region, the lower left corner region is the B region, and the upper right corner region is the C region; the long side direction of the bottom surface of the test block I is the left-right direction, the short side direction of the bottom surface of the test block I is the front-rear direction, the top surface and the bottom surface of each region A, B and C are a square with a side length of 100 cm, the height is 30 cm, the front and rear side surfaces are perpendicular to the bottom surface, and the left and right side surfaces form a dihedral angle of 45° with the bottom surface;

[0007] The test block II is an inclined quadrangular prism, two side surfaces with a dihedral angle of 45° with the bottom surface are referred to as left and right side surfaces, and are referred to as side surface II-a and side surface II-c respectively, and two side surfaces perpendicular to the bottom surface are referred to as front and rear side surfaces, and are referred to as side surface II-b and side surface II-d respectively;

[0008] There are four rectangular grooves on the side surface II-a. Selecting the direction of the front view of the side surface II-a, the four grooves all extend downward from the upper boundary of the side surface II-a, each with a width of 20 cm and a depth of 0.25 cm, and are numbered as II-a-1 groove, II-a-2 groove, II-a-3 groove and II-a-4 groove from right to left respectively;

[0009] There are four rectangular grooves on the side surface II-b. Selecting the direction of the front view of the side surface II-b, the four grooves all extend upward from the lower boundary of the side surface II-b, each with a width of 16 cm and a depth of 0.25 cm, and are numbered as II-b-1 groove, II-b-2 groove, II-b-3 groove and II-b-4 groove from right to left respectively;

[0010] There are four rectangular grooves on the side surface II-c. Selecting the direction of the front view of the side surface II-c, the four grooves all extend upward from the lower boundary of the side surface II-c, each with a width of 20 cm and a depth of 0.25 cm, and are numbered as II-c-1 groove, II-c-2 groove, II-c-3 groove and II-c-4 groove from right to left respectively;

[0011] There are four rectangular grooves on the side surface II-d. Selecting the direction of the front view of the side surface II-d, the four grooves all extend downward from the upper boundary of the side surface II-d, each with a width of 16 cm and a depth of 0.25 cm, and are numbered as II-d-1 groove, II-d-2 groove, II-d-3 groove and II-d-4 groove from right to left respectively;

[0012] The test block III is a slanting quadrangular prism. Two side surfaces with a dihedral angle of 45° to the bottom surface are called left and right side surfaces, and are respectively called side surface III-a and side surface III-c. Two side surfaces perpendicular to the bottom surface are called front and back side surfaces, and are respectively called side surface III-b and side surface III-d.

[0013] There are four rectangular grooves on the side surface III-a. Selecting the direction of the front view of the side surface III-a, the four grooves all extend upward from the lower boundary of the side surface III-a, each with a width of 20 cm and a depth of 0.25 cm, and are numbered as III-a-1 groove, III-a-2 groove, III-a-3 groove and III-a-4 groove from right to left respectively.

[0014] There are four rectangular grooves on the side surface III-b. Selecting the direction of the front view of the side surface III-b, the four grooves all extend downward from the upper boundary of the side surface III-b, each with a width of 16 cm and a depth of 0.25 cm, and are numbered as III-b-1 groove, III-b-2 groove, III-b-3 groove and III-b-4 groove from right to left respectively.

[0015] There are four rectangular grooves on the side III-c, and the four grooves are all extended downward from the upper boundary of the side III-c in the direction of the front view of the side III-c, and the width of each groove is 20 cm, and the depth of each groove is 0.25 cm, and the four grooves are numbered as III-c-1 groove, III-c-2 groove, III-c-3 groove and III-c-4 groove from right to left respectively;

[0016] There are four rectangular grooves on the side III-d, and the four grooves are all extended upward from the lower boundary of the side III-d in the direction of the front view of the side III-d, and the width of each groove is 16 cm, and the depth of each groove is 0.25 cm, and the four grooves are numbered as III-d-1 groove, III-d-2 groove, III-d-3 groove and III-d-4 groove from right to left respectively;

[0017] The three parts of the test block I, the test block II and the test block III are combined in different forms, and can be used to simulate various surface cracks of airport pavement and carry out various indoor simulation tests.

[0018] Preferably, the outer contour of the test block I is a rectangular cuboid, the length of the long side of the bottom surface is 300 cm, the length of the short side of the bottom surface is 200 cm, and the height is 70 cm.

[0019] The left side boundary of the top surface of the A area in the through groove is 50 cm away from the left side boundary of the top surface of the test block I, and the right side boundary of the top surface of the C area in the through groove is 50 cm away from the right side boundary of the top surface of the test block I.

[0020] The material of the test block I is composed of two parts: the lower part of the 40 cm high rectangular cuboid is cement stabilized gravel, and the upper part of the 30 cm high part with the through groove is cement concrete.

[0021] Preferably, the test block II has a square top surface and a square bottom surface with a side length of 100 cm, and a height of 30 cm, and the material of the test block II is cement concrete.

[0022] The heights of the II-a-1 groove, the II-a-2 groove, the II-a-3 groove and the II-a-4 groove are 6 cm, 12 cm, 18 cm and 24 cm respectively, the left and right boundaries of each groove are parallel to the left and right boundaries of the side II-a, the right boundary of the II-a-1 groove is 2.5 cm away from the right boundary of the side II-a, the left boundary of the II-a-1 groove is parallel to the left boundary of the side II-a, and the distance between the two boundaries is 2.5 cm, and the distance between the adjacent grooves is 5 cm.

[0023] II-b-1 groove, II-b-2 groove, II-b-3 groove, II-b-4 groove, the heights of which are 6 cm, 12 cm, 18 cm, 24 cm respectively, the left and right boundaries of each groove are perpendicular to the lower boundary of side II-b, the intersection between the left boundary of II-b-4 groove and the lower boundary of side II-b, the intersection between the left boundary of side II-b and the lower boundary, the distance between the two intersections is 30 cm, the intersection between the right boundary of II-b-1 groove and the lower boundary of side II-b, the intersection between the right boundary of side II-b and the lower boundary, the two intersections coincide with each other, the distance between adjacent grooves is 2 cm;

[0024] II-c-1 groove, II-c-2 groove, II-c-3 groove, II-c-4 groove, the heights of which are 6 cm, 12 cm, 18 cm, 24 cm respectively, the left and right boundaries of each groove are parallel to the left and right boundaries of side II-a, the right boundary of II-c-1 groove is 2.5 cm away from the right boundary of side II-c, the left boundary of II-c-1 groove is parallel to the left boundary of side II-c, the distance between the two is 2.5 cm, the distance between adjacent grooves is 5 cm;

[0025] II-d-1 groove, II-d-2 groove, II-d-3 groove, II-d-4 groove, the heights of which are 6 cm, 12 cm, 18 cm, 24 cm respectively, the left and right boundaries of each groove are perpendicular to the upper boundary of side II-d, the intersection between the left boundary of II-d-4 groove and the upper boundary of side II-d, the intersection between the left boundary of side II-d and the upper boundary, the distance between the two intersections is 30 cm, the intersection between the right boundary of II-d-1 groove and the upper boundary of side II-d, the intersection between the right boundary of side II-d and the upper boundary, the two intersections coincide with each other, the distance between adjacent grooves is 2 cm.

[0026] Preferably, the test block III has a square top surface and a square bottom surface, each with a side length of 100 cm, and a height of 30 cm, and the material of the test block III is cement concrete;

[0027] III-a-1 groove, III-a-2 groove, III-a-3 groove, III-a-4 groove, the heights of which are 6 cm, 12 cm, 18 cm, 24 cm respectively, the left and right boundaries of each groove are parallel to the left and right boundaries of side III-a, the left boundary of III-a-1 groove is 2.5 cm away from the left boundary of side III-a, the right boundary of III-a-1 groove is parallel to the right boundary of side III-a, the distance between the two is 2.5 cm, the distance between adjacent grooves is 5 cm;

[0028] III-b-1 groove, III-b-2 groove, III-b-3 groove, III-b-4 groove, the height of which is respectively 6cm, 12cm, 18cm, 24cm, the left and right boundaries of each groove are perpendicular to the upper boundary of side III-b, the intersection between the right boundary of III-b-1 groove and the upper boundary of side III-b, the intersection between the right boundary of side III-b and the upper boundary, the distance between the two intersections is 30cm, the intersection between the left boundary of III-b-4 groove and the upper boundary of side III-b, the intersection between the left boundary of side III-b and the upper boundary, the two intersections coincide with each other, the distance between adjacent grooves is 2cm;

[0029] III-c-1 groove, III-c-2 groove, III-c-3 groove, III-c-4 groove, the height of which is respectively 6cm, 12cm, 18cm, 24cm, the left and right boundaries of each groove are parallel to the left and right boundaries of side III-a, the right boundary of III-c-1 groove is 2.5cm away from the right boundary of side III-c, the left boundary of III-c-1 groove is parallel to the left boundary of side III-c, and the distance between them is 2.5cm, the distance between adjacent grooves is 5cm;

[0030] III-d-1 groove, III-d-2 groove, III-d-3 groove, III-d-4 groove, the height of which is respectively 6cm, 12cm, 18cm, 24cm, the left and right boundaries of each groove are perpendicular to the lower boundary of side III-d, the intersection between the left boundary of III-d-4 groove and the lower boundary of side III-d, the intersection between the left boundary of side III-d and the lower boundary, the two intersections coincide with each other, the intersection between the right boundary of III-d-1 groove and the lower boundary of side III-d, the intersection between the right boundary of side III-d and the lower boundary, the distance between the two intersections is 30cm, the distance between adjacent grooves is 2cm.

[0031] The use method of the test device for simulating the surface layer cracks of airport pavement is as follows, including the following steps:

[0032] Place test block III in the A area of the through groove of test block I, and place test block II in the B area of the through groove of test block I, at this time, III-b-1 groove and II-d-1 groove, III-b-2 groove and II-d-2 groove, III-b-3 groove and II-d-3 groove, III-b-4 groove and II-d-4 groove are combined to form four vertical open cracks with a width of 0.5cm, and the crack heights are respectively 6cm, 12cm, 18cm and 24cm; II-c-1 groove, II-c-2 groove, II-c-3 groove and II-c-4 groove are combined with the side of the through groove of test block I to form four inclined closed cracks with a width of 0.25cm, and the crack heights are respectively 6cm, 12cm, 18cm and 24cm;

[0033] Put test block III in the A area of the through groove of test block I, and put test block II in the C area of the through groove of test block I, at this time, the III-c-1 groove and the II-a-1 groove, the III-c-2 groove and the II-a-2 groove, the III-c-3 groove and the II-a-3 groove, and the III-c-4 groove and the II-a-4 groove are combined to form four inclined open cracks with a width of 0.5 cm, and the crack heights are 6 cm, 12 cm, 18 cm and 24 cm respectively; the II-b-1 groove, the II-b-2 groove, the II-b-3 groove and the II-b-4 groove are combined with the side of the through groove of test block I to form four vertical closed cracks with a width of 0.25 cm, and the crack heights are 6 cm, 12 cm, 18 cm and 24 cm respectively.

[0034] Put test block II in the A area of the through groove of test block I, and put test block III in the C area of the through groove of test block I, at this time, the III-a-1 groove and the II-c-1 groove, the III-a-2 groove and the II-c-2 groove, the III-a-3 groove and the II-c-3 groove, and the III-a-4 groove and the II-c-4 groove are combined to form four inclined closed cracks with a width of 0.5 cm, and the crack heights are 6 cm, 12 cm, 18 cm and 24 cm respectively; the III-b-1 groove, the III-b-2 groove, the III-b-3 groove and the III-b-4 groove are combined with the side of the through groove of test block I to form four vertical open cracks with a width of 0.25 cm, and the crack heights are 6 cm, 12 cm, 18 cm and 24 cm respectively.

[0035] Put test block II in the A area of the through groove of test block I, and put test block III in the B area of the through groove of test block I, at this time, the II-b-1 groove and the III-d-1 groove, the II-b-2 groove and the III-d-2 groove, the II-b-3 groove and the III-d-3 groove, and the II-b-4 groove and the III-d-4 groove are combined to form four vertical closed cracks with a width of 0.5 cm, and the crack heights are 6 cm, 12 cm, 18 cm and 24 cm respectively; the III-c-1 groove, the III-c-2 groove, the III-c-3 groove and the III-c-4 groove are combined with the side of the through groove of test block I to form four inclined open cracks with a width of 0.25 cm, and the crack heights are 6 cm, 12 cm, 18 cm and 24 cm respectively.

[0036] Beneficial effects: Compared with the prior art, the technical scheme of the present application has the following beneficial technical effects:

[0037] The test device for simulating the surface layer cracks of the airport pavement provided by the application can simulate 32 different airport pavement surface layer cracks with the opening / closed, inclined / vertical, width of 0.25cm / 0.5cm and height of 6 / 12 / 18 / 24cm through the combination of the test block I, the test block II and the test block III, and compared with the test models of the above 32 cracks arranged separately, the test cost is significantly reduced, and the combination between the test blocks is simple. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 is a schematic view of the test block I;

[0039] Figure 2 is a three-view of the test block I;

[0040] Figure 3 is a schematic view of the test block II;

[0041] Figure 4 is a three-view of the test block II;

[0042] Figure 5 is a schematic view of the test block III;

[0043] Figure 6 is a three-view of the test block III;

[0044] Figure 7 is a schematic view of the embodiment one. EMBODIMENT

[0045] The application will be further described below in conjunction with the drawings, and it should be understood that these embodiments are only used for illustrating the application and are not used for limiting the scope of the application, and after reading the application, the modifications of various equivalent forms of the application by the person skilled in the art all fall within the scope defined by the appended claims of the application.

[0046] The test device for simulating the surface layer cracks of the airport pavement provided by the application comprises three parts of the test block I, the test block II and the test block III, and the three parts are combined in different forms, which can simulate 32 surface layer cracks with different widths, different heights, opening or closed, vertical or inclined in the airport pavement, and is used for developing various indoor simulation tests.

[0047] As shown in Figure 1 and Figure 2 , the outer profile of the test block I is a cuboid, the length of the long side of the bottom surface is 300cm, the length of the short side of the bottom surface is 200cm, and the height is 70cm, and the related dimensions of the test block I are marked in Figure 2 .

[0048] The test block I is provided with a front and rear through groove in the shape of Г from the top surface downward, the through groove is in the shape of Г in the plan view of the test block I, and the through groove is divided into three inclined quadrangular prism regions A, B and C with the same shape.

[0049] The upper left corner region of the through slot in the top view of the test block I is region A, the lower left corner region is region B, and the upper right corner region is region C.

[0050] The long side direction of the bottom surface of the test block I is taken as the left-right direction, and the short side direction of the bottom surface of the test block I is taken as the front-rear direction.

[0051] The top surface and the bottom surface of each of regions A, B, and C are square with a side length of 100 cm, and the height is 30 cm.

[0052] The front-rear side surface is perpendicular to the bottom surface, and the left-right side surface forms a dihedral angle of 45° with the bottom surface.

[0053] The left side boundary of the top surface of region A in the through slot is 50 cm away from the left side boundary of the top surface of the test block I, and the right side boundary of the top surface of region C in the through slot is 50 cm away from the right side boundary of the top surface of the test block I.

[0054] The material of the test block I is composed of two parts: the lower part of 40 cm high is a cuboid part made of cement stabilized macadam, and the upper part of 30 cm high with the through slot is made of cement concrete.

[0055] As shown in Figure 3 and Figure 4 , the test block II is an oblique quadrangular prism, the top surface and the bottom surface are square with a side length of 100 cm, the height is 30 cm, two side surfaces forming a dihedral angle of 45° with the bottom surface are called left and right side surfaces, respectively, which are side surface II-a and side surface II-c.

[0056] Two side surfaces perpendicular to the bottom surface are called front and rear side surfaces, respectively, which are side surface II-b and side surface II-d.

[0057] The related dimensions of the test block II are marked in Figure 4 The material of the test block II is cement concrete.

[0058] There are four rectangular grooves on the side surface II-a, and the four grooves all extend downward from the upper boundary of the side surface II-a in the direction perpendicular to the side surface II-a, the width is 20 cm, and the groove depth is 0.25 cm.

[0059] From right to left, they are II-a-1 groove, II-a-2 groove, II-a-3 groove, and II-a-4 groove, with a height of 6 cm, 12 cm, 18 cm, and 24 cm, respectively.

[0060] The left and right boundaries of each groove are parallel to the left and right boundaries of the side surface II-a, the right boundary of the II-a-1 groove is 2.5 cm away from the right boundary of the side surface II-a, the left boundary of the II-a-4 groove is parallel to the left boundary of the side surface II-a, and the distance between them is 2.5 cm, and the distance between adjacent grooves is 5 cm.

[0061] There are four rectangular grooves on the side surface II-b, and the four grooves all extend upward from the lower boundary of the side surface II-b, with a width of 16 cm and a depth of 0.25 cm.

[0062] The four grooves are respectively numbered as II-b-1 groove, II-b-2 groove, II-b-3 groove and II-b-4 groove from right to left, with a height of 6 cm, 12 cm, 18 cm and 24 cm respectively.

[0063] The distance between the intersection point between the left boundary of the II-b-4 groove and the lower boundary and the intersection point between the left boundary of the side surface II-b and the lower boundary is 30 cm.

[0064] The intersection point between the right boundary of the II-b-1 groove and the lower boundary and the intersection point between the right boundary of the side surface II-b and the lower boundary coincide with each other.

[0065] The distance between adjacent grooves is 2 cm.

[0066] There are four rectangular grooves on the side surface II-c, and the four grooves all extend upward from the lower boundary of the side surface II-c, with a width of 20 cm and a depth of 0.25 cm.

[0067] The four grooves are respectively numbered as II-c-1 groove, II-c-2 groove, II-c-3 groove and II-c-4 groove from right to left, with a height of 6 cm, 12 cm, 18 cm and 24 cm respectively.

[0068] The left and right boundaries of each groove are parallel to the left and right boundaries of the side surface II-a, the right boundary of the II-c-1 groove is 2.5 cm away from the right boundary of the side surface II-c, the left boundary of the II-c-4 groove is parallel to the left boundary of the side surface II-c, and the distance between adjacent grooves is 5 cm.

[0069] There are four rectangular grooves on the side surface II-d, and the four grooves all extend downward from the upper boundary of the side surface II-d, with a width of 16 cm and a depth of 0.25 cm.

[0070] The left and right boundaries of each groove are perpendicular to the upper boundary of the side surface II-d.

[0071] The intersection between the right boundary and the upper boundary of the groove II-d-1, the intersection between the right boundary and the upper boundary of the side II-d, and the intersection between the left boundary and the upper boundary of the side II-d are coincident with each other.

[0072] The intersection between the left boundary and the upper boundary of the groove II-d-4, the intersection between the left boundary and the upper boundary of the side II-d, and the intersection between the right boundary and the upper boundary of the side II-d are coincident with each other.

[0073] As shown in FIGS. 1, 2, and 3, the test block I is a right rectangular prism, the top surface and the bottom surface are squares with a side length of 100 cm, and the height is 30 cm. Two sides with a dihedral angle of 45° to the bottom surface are referred to as left and right sides, respectively, and are referred to as side I-a and side I-c. Two sides perpendicular to the bottom surface are referred to as front and back sides, respectively, and are referred to as side I-b and side I-d. Figure 5 Figure 6 As shown in FIGS. 1, 2, and 3, the test block I is a right rectangular prism, the top surface and the bottom surface are squares with a side length of 100 cm, and the height is 30 cm. Two sides with a dihedral angle of 45° to the bottom surface are referred to as left and right sides, respectively, and are referred to as side I-a and side I-c. Two sides perpendicular to the bottom surface are referred to as front and back sides, respectively, and are referred to as side I-b and side I-d.

[0074] The relevant dimensions of the test block I are labeled in FIGS. 1, 2, and 3, and the material of the test block I is cement concrete. Figure 6

[0075] There are four rectangular grooves on the side I-a. Selecting the direction of the front view of the side I-a, the four grooves all extend upward from the lower boundary of the side I-a, the width of each groove is 20 cm, the depth of each groove is 0.25 cm, and the four grooves are numbered from right to left as groove I-a-1, groove I-a-2, groove I-a-3, and groove I-a-4. The heights of the four grooves are 6 cm, 12 cm, 18 cm, and 24 cm, respectively. The left and right boundaries of each groove are parallel to the left and right boundaries of the side I-a.

[0076] The left boundary of the groove I-a-1 is 2.5 cm away from the left boundary of the side I-a, and the right boundary of the groove I-a-1 is parallel to the right boundary of the side I-a, and the distance between the two boundaries is 2.5 cm. The distance between adjacent grooves is 5 cm.

[0077] There are four rectangular grooves on the side I-b. Selecting the direction of the front view of the side I-b, the four grooves all extend downward from the upper boundary of the side I-b, the width of each groove is 16 cm, the depth of each groove is 0.25 cm, and the four grooves are numbered from right to left as groove I-b-1, groove I-b-2, groove I-b-3, and groove I-b-4. The heights of the four grooves are 6 cm, 12 cm, 18 cm, and 24 cm, respectively. The left and right boundaries of each groove are perpendicular to the lower boundary of the side I-b.

[0078] ​​The intersection between the right boundary and the upper boundary of the III-b-1 groove, the intersection between the right boundary and the upper boundary of the side III-b, the distance between the two intersections is 30 cm, the intersection between the left boundary and the upper boundary of the III-b-4 groove, the intersection between the left boundary and the upper boundary of the side III-b, the two intersections coincide with each other, and the distance between the adjacent grooves is 2 cm.

[0079] There are four rectangular grooves on the side III-c. In the direction perpendicular to the side III-c, the four grooves all extend downward from the upper boundary of the side III-c, and the width of each groove is 20 cm. The depth of each groove is 0.25 cm. The four grooves are numbered III-c-1 groove, III-c-2 groove, III-c-3 groove and III-c-4 groove from right to left, and the heights of the four grooves are 6 cm, 12 cm, 18 cm and 24 cm respectively. The left and right boundaries of each groove are parallel to the left and right boundaries of the side III-a.

[0080] The right boundary of the III-c-1 groove is 2.5 cm away from the right boundary of the side III-c, and the left boundary of the III-c-1 groove is parallel to the left boundary of the side III-c, and the distance between the two boundaries is 2.5 cm. The distance between the adjacent grooves is 5 cm.

[0081] There are four rectangular grooves on the side III-d. In the direction perpendicular to the side III-d, the four grooves all extend upward from the lower boundary of the side III-d, and the width of each groove is 16 cm. The depth of each groove is 0.25 cm. The four grooves are numbered III-d-1 groove, III-d-2 groove, III-d-3 groove and III-d-4 groove from right to left, and the heights of the four grooves are 6 cm, 12 cm, 18 cm and 24 cm respectively. The left and right boundaries of each groove are perpendicular to the lower boundary of the side III-d.

[0082] The intersection between the left boundary and the lower boundary of the III-d-4 groove, the intersection between the left boundary and the lower boundary of the side III-d, the two intersections coincide with each other, the intersection between the right boundary and the lower boundary of the III-d-1 groove, the intersection between the right boundary and the lower boundary of the side III-d, the distance between the two intersections is 30 cm, and the distance between the adjacent grooves is 2 cm.

[0083] A test device for simulating airport pavement surface layer cracks, the use method is as follows: through the combination of test block I, test block II and test block III, 32 different cracks of the airport pavement surface layer can be simulated, including open / closed, inclined / vertical, width 0.25 cm / 0.5 cm, height 6 / 12 / 18 / 24 cm:

[0084] Place Test Block III in Area A of the through-slot of Test Block I and Test Block II in Area B of the through-slot of Test Block I. At this time, the III-b-1 groove and the II-d-1 groove, the III-b-2 groove and the II-d-2 groove, the III-b-3 groove and the II-d-3 groove, and the III-b-4 groove and the II-d-4 groove combine to form four vertical open cracks with a width of 0.5 cm and a crack height of 6 cm, 12 cm, 18 cm, and 24 cm, respectively.

[0085] The II-c-1 groove, the II-c-2 groove, the II-c-3 groove, and the II-c-4 groove combine with the side of the through-slot of Test Block I to form four inclined closed cracks with a width of 0.25 cm and a crack height of 6 cm, 12 cm, 18 cm, and 24 cm, respectively.

[0086] Place Test Block III in Area A of the through-slot of Test Block I and Test Block II in Area C of the through-slot of Test Block I. At this time, the III-c-1 groove and the II-a-1 groove, the III-c-2 groove and the II-a-2 groove, the III-c-3 groove and the II-a-3 groove, and the III-c-4 groove and the II-a-4 groove combine to form four inclined open cracks with a width of 0.5 cm and a crack height of 6 cm, 12 cm, 18 cm, and 24 cm, respectively; the II-b-1 groove, the II-b-2 groove, the II-b-3 groove, and the II-b-4 groove combine with the side of the through-slot of Test Block I to form four vertical closed cracks with a width of 0.25 cm and a crack height of 6 cm, 12 cm, 18 cm, and 24 cm, respectively.

[0087] Place Test Block II in Area A of the through-slot of Test Block I and Test Block III in Area C of the through-slot of Test Block I. At this time, the III-a-1 groove and the II-c-1 groove, the III-a-2 groove and the II-c-2 groove, the III-a-3 groove and the II-c-3 groove, and the III-a-4 groove and the II-c-4 groove combine to form four inclined closed cracks with a width of 0.5 cm and a crack height of 6 cm, 12 cm, 18 cm, and 24 cm, respectively.

[0088] The III-b-1 groove, the III-b-2 groove, the III-b-3 groove, and the III-b-4 groove combine with the side of the through-slot of Test Block I to form four vertical open cracks with a width of 0.25 cm and a crack height of 6 cm, 12 cm, 18 cm, and 24 cm, respectively.

[0089] Place specimen II in area A of the through groove of specimen I, and place specimen III in area B of the through groove of specimen I. At this time, the grooves II-b-1 and III-d-1, II-b-2 and III-d-2, II-b-3 and III-d-3, and II-b-4 and III-d-4 combine to form four vertical closed cracks with a width of 0.5 cm and crack heights of 6 cm, 12 cm, 18 cm, and 24 cm, respectively. The grooves III-c-1, III-c-2, III-c-3, and III-c-4 combine with the side of the through groove of specimen I to form four inclined open cracks with a width of 0.25 cm and crack heights of 6 cm, 12 cm, 18 cm, and 24 cm, respectively. Example

[0090] The following are some representative embodiments of the present invention. Example

[0091] like Figure 7 As shown, placing test block III in area A of the through groove of test block I and test block II in area B of the through groove of test block I can simultaneously simulate eight different cracks in the surface layer of an airport pavement. At this time, the combinations of grooves III-b-1 with grooves II-d-1, III-b-2 with grooves II-d-2, III-b-3 with grooves II-d-3, and III-b-4 with grooves II-d-4 form four vertical open cracks with a width of 0.5 cm and crack heights of 6 cm, 12 cm, 18 cm, and 24 cm, respectively. The combinations of grooves II-c-1, II-c-2, II-c-3, and II-c-4 with the side of the through groove of test block I form four inclined closed cracks with a width of 0.25 cm and crack heights of 6 cm, 12 cm, 18 cm, and 24 cm, respectively. Example

[0092] Placing specimen III in area A of the through groove of specimen I and specimen II in area C of the through groove of specimen I can simultaneously simulate eight different cracks in the pavement surface layer of an airport. At this time, the combinations of grooves III-c-1 with grooves II-a-1, III-c-2 with grooves II-a-2, III-c-3 with grooves II-a-3, and III-c-4 with grooves II-a-4 form four inclined open cracks with a width of 0.5 cm and crack heights of 6 cm, 12 cm, 18 cm, and 24 cm, respectively. The combinations of grooves II-b-1, II-b-2, II-b-3, and II-b-4 with the side of the through groove of specimen I form four vertical closed cracks with a width of 0.25 cm and crack heights of 6 cm, 12 cm, 18 cm, and 24 cm, respectively. Embodiment

[0093] The test block II is placed in the A area of the through groove of the test block I, and the test block III is placed in the C area of the through groove of the test block I, so that eight different cracks in the surface layer of the airport runway can be simulated at the same time. At this time, the III-a-1 groove and the II-c-1 groove, the III-a-2 groove and the II-c-2 groove, the III-a-3 groove and the II-c-3 groove, and the III-a-4 groove and the II-c-4 groove are combined to form four inclined closed cracks with a width of 0.5 cm, and the crack heights are 6 cm, 12 cm, 18 cm, and 24 cm, respectively; the III-b-1 groove, the III-b-2 groove, the III-b-3 groove, and the III-b-4 groove are combined with the side surface of the through groove of the test block I to form four vertical open cracks with a width of 0.25 cm, and the crack heights are 6 cm, 12 cm, 18 cm, and 24 cm, respectively. Embodiment

[0094] The test block II is placed in the A area of the through groove of the test block I, and the test block III is placed in the C area of the through groove of the test block I, so that eight different cracks in the surface layer of the airport runway can be simulated at the same time. At this time, the III-a-1 groove and the II-c-1 groove, the III-a-2 groove and the II-c-2 groove, the III-a-3 groove and the II-c-3 groove, and the III-a-4 groove and the II-c-4 groove are combined to form four inclined closed cracks with a width of 0.5 cm, and the crack heights are 6 cm, 12 cm, 18 cm, and 24 cm, respectively; the III-b-1 groove, the III-b-2 groove, the III-b-3 groove, and the III-b-4 groove are combined with the side surface of the through groove of the test block I to form four vertical open cracks with a width of 0.25 cm, and the crack heights are 6 cm, 12 cm, 18 cm, and 24 cm, respectively. Embodiment

[0094] The test block II is placed in the A area of the through groove of the test block I, and the test block III is placed in the C area of the through groove of the test block I, so that eight different cracks in the surface layer of the airport runway can be simulated at the same time. At this time, the III-a-1 groove and the II-c-1 groove, the III-a-2 groove and the II-c-2 groove, the III-a-3 groove and the II-c-3 groove, and the III-a-4 groove and the II-c-4 groove are combined to form four inclined closed cracks with a width of 0.5 cm, and the crack heights are 6 cm, 12 cm, 18 cm, and 24 cm, respectively; the III-b-1 groove, the III-b-2 groove, the III-b-3 groove, and the III-b-4 groove are combined with the side surface of the through groove of the test block I to form four vertical open cracks with a width of 0.25 cm, and the crack heights are 6 cm, 12 cm, 18 cm, and 24 cm, respectively.

Claims

1. A test device for simulating cracks in the surface course of an airport pavement, characterized in that, Comprise: Test block I, test block I from its top surface downward open Г-shaped front and rear through slot, through slot in the top view of test block I presents Г-shaped, through slot is divided into A, B, c three shape exactly the same oblique four prism area, the left upper corner area of through slot in the top view of test block I is A area, left lower corner area is B area, right upper corner area is c area;With test block I bottom surface long side direction as left and right direction, with test block I bottom surface short side direction as front and rear direction, A, B, c each area top surface and bottom surface are square of 100cm side length, height is 30cm, front and rear side and bottom surface vertical, left and right side and bottom surface 45° dihedral angle; Test block II, for oblique four prism, two with bottom surface 45° dihedral angle side are called left and right side, respectively called side II-a and side II-c, two with bottom surface vertical side are called front and rear side, respectively called side II-b and side II-d; Side II-a has four rectangular grooves, select the direction of the side II-a, four grooves all extend from the upper boundary of the side II-a downward, width is 20cm, recess depth is 0.25cm, from right to left are respectively II-a-1 groove, II-a-2 groove, II-a-3 groove, II-a-4 groove; Side II-b has four rectangular grooves, select the direction of the side II-b, four grooves all extend from the lower boundary of the side II-b upward, width is 16cm, recess depth is 0.25cm, from right to left are respectively II-b-1 groove, II-b-2 groove, II-b-3 groove, II-b-4 groove; Side II-c has four rectangular grooves, select the direction of the side II-c, four grooves all extend from the lower boundary of the side II-c upward, width is 20cm, recess depth is 0.25cm, from right to left are respectively II-c-1 groove, II-c-2 groove, II-c-3 groove, II-c-4 groove; Side II-d has four rectangular grooves, select the direction of the side II-d, four grooves all extend from the upper boundary of the side II-d downward, width is 16cm, recess depth is 0.25cm, from right to left are respectively II-d-1 groove, II-d-2 groove, II-d-3 groove, II-d-4 groove; Test block III, for oblique four prism, two with bottom surface 45° dihedral angle side are called left and right side, respectively called side III-a and side III-c, two with bottom surface vertical side are called front and rear side, respectively called side III-b and side III-d; Side III-a has four rectangular grooves, select the direction of the side III-a, four grooves all extend from the lower boundary of the side III-a upward, width is 20cm, recess depth is 0.25cm, from right to left are respectively III-a-1 groove, III-a-2 groove, III-a-3 groove, III-a-4 groove; There are four rectangular grooves on the side III-b, and the four grooves all extend downward from the upper boundary of the side III-b in the direction perpendicular to the side III-b, and the width of each groove is 16 cm, and the depth of each groove is 0.25 cm, and they are numbered as III-b-1 groove, III-b-2 groove, III-b-3 groove and III-b-4 groove from right to left respectively; There are four rectangular grooves on the side III-c, and the four grooves all extend downward from the upper boundary of the side III-c in the direction perpendicular to the side III-c, and the width of each groove is 20 cm, and the depth of each groove is 0.25 cm, and they are numbered as III-c-1 groove, III-c-2 groove, III-c-3 groove and III-c-4 groove from right to left respectively; There are four rectangular grooves on the side III-d, and the four grooves all extend upward from the lower boundary of the side III-d in the direction perpendicular to the side III-d, and the width of each groove is 16 cm, and the depth of each groove is 0.25 cm, and they are numbered as III-d-1 groove, III-d-2 groove, III-d-3 groove and III-d-4 groove from right to left respectively; The test block I, the test block II and the test block III are combined in different forms, and can simulate various surface cracks of airport pavement and be used for developing various indoor simulation tests.

2. The test apparatus for simulating runway surface cap cracking as recited in claim 1, wherein: The outer contour of the test block I is a cuboid, the length of the long side of the bottom surface is 300 cm, the length of the short side of the bottom surface is 200 cm, and the height is 70 cm; The left boundary of the top surface of the A area in the through groove is 50 cm away from the left boundary of the top surface of the test block I, and the right boundary of the top surface of the c area in the through groove is 50 cm away from the right boundary of the top surface of the test block I; The material of the test block I is composed of two parts: the cuboid part with a height of 40 cm is made of cement stabilized macadam, and the part with a height of 30 cm and provided with the through groove is made of cement concrete.

3. The test apparatus for simulating runway surface cap cracking as recited in claim 2, wherein: The test block II has a square top surface and a square bottom surface with a side length of 100 cm, and the height is 30 cm, and the material of the test block II is cement concrete; The heights of the II-a-1 groove, the II-a-2 groove, the II-a-3 groove and the II-a-4 groove are 6 cm, 12 cm, 18 cm and 24 cm respectively, the left and right boundaries of each groove are parallel to the left and right boundaries of the side II-a, the right boundary of the II-a-1 groove is 2.5 cm away from the right boundary of the side II-a, the left boundary of the II-a-1 groove is parallel to the left boundary of the side II-a, and the distance between the two boundaries is 2.5 cm, and the distance between the adjacent grooves is 5 cm; The grooves II-b-1, II-b-2, II-b-3, and II-b-4 have heights of 6cm, 12cm, 18cm, and 24cm, respectively. The left and right boundaries of each groove are perpendicular to the lower boundary of side II-b. The intersection of the left and lower boundaries of groove II-b-4 and the intersection of the left and lower boundaries of side II-b are 30cm apart. The intersection of the right and lower boundaries of groove II-b-1 and the intersection of the right and lower boundaries of side II-b coincide. The distance between adjacent grooves is 2cm. The grooves II-c-1, II-c-2, II-c-3, and II-c-4 have heights of 6cm, 12cm, 18cm, and 24cm, respectively. The left and right boundaries of each groove are parallel to the left and right boundaries of side II-a. The right boundary of groove II-c-1 is 2.5cm away from the right boundary of side II-c. The left boundary of groove II-c-1 is parallel to the left boundary of side II-c, and the two are 2.5cm apart. The spacing between adjacent grooves is 5cm. The grooves II-d-1, II-d-2, II-d-3, and II-d-4 have heights of 6cm, 12cm, 18cm, and 24cm, respectively. The left and right boundaries of each groove are perpendicular to the upper boundary of side II-d. The distance between the intersection of the left and upper boundaries of groove II-d-4 and the intersection of the left and upper boundaries of side II-d is 30cm. The intersection of the right and upper boundaries of groove II-d-1 and the intersection of the right and upper boundaries of side II-d coincides. The spacing between adjacent grooves is 2cm.

4. The test apparatus for simulating runway surface cracks as recited in claim 3, wherein: Test block III has a square with a side length of 100cm on the top and bottom surfaces and a height of 30cm. The material of test block III is cement concrete. The grooves III-a-1, III-a-2, III-a-3, and III-a-4 have heights of 6cm, 12cm, 18cm, and 24cm, respectively. The left and right boundaries of each groove are parallel to the left and right boundaries of side III-a. The left boundary of groove III-a-1 is 2.5cm away from the left boundary of side III-a, and the right boundary of groove III-a-1 is parallel to the right boundary of side III-a, with a distance of 2.5cm between them. The spacing between adjacent grooves is 5cm. The grooves III-b-1, III-b-2, III-b-3, and III-b-4 have heights of 6cm, 12cm, 18cm, and 24cm, respectively. The left and right boundaries of each groove are perpendicular to the upper boundary of side III-b. The distance between the intersection of the right and upper boundaries of groove III-b-1 and the intersection of the right and upper boundaries of side III-b is 30cm. The intersection of the left and upper boundaries of groove III-b-4 and the intersection of the left and upper boundaries of side III-b coincides with each other. The spacing between adjacent grooves is 2cm. III-c-1 groove, III-c-2 groove, III-c-3 groove, III-c-4 groove, the height of which is 6cm, 12cm, 18cm, 24cm respectively, the left and right boundaries of each groove are parallel to the left and right boundaries of side III-a, the right boundary of III-c-1 groove is 2.5cm away from the right boundary of side III-c, the left boundary of III-c-1 groove is parallel to the left boundary of side III-c, and the distance between the two is 2.5cm, and the distance between adjacent grooves is 5cm; III-d-1 groove, III-d-2 groove, III-d-3 groove, III-d-4 groove, the height of which is 6cm, 12cm, 18cm, 24cm respectively, the left and right boundaries of each groove are perpendicular to the lower boundary of side III-d, the intersection between the left boundary of III-d-4 groove and the lower boundary, and the intersection between the left boundary of side III-d and the lower boundary, coincide with each other, the intersection between the right boundary of III-d-1 groove and the lower boundary, and the intersection between the right boundary of side III-d and the lower boundary, the distance between the two is 30cm, and the distance between adjacent grooves is 2cm.

5. A method of using a test device for simulating cracks in a surface layer of an airfield pavement according to claim 4, characterized in that The steps include: Place test block III in the A area of the through groove of test block I, and place test block II in the B area of the through groove of test block I, at this time, III-b-1 groove and II-d-1 groove, III-b-2 groove and II-d-2 groove, III-b-3 groove and II-d-3 groove, III-b-4 groove and II-d-4 groove are combined to form four vertical open cracks with a width of 0.5cm, and the crack heights are 6cm, 12cm, 18cm, and 24cm respectively; II-c-1 groove, II-c-2 groove, II-c-3 groove, and II-c-4 groove are combined with the side of the through groove of test block I to form four inclined closed cracks with a width of 0.25cm, and the crack heights are 6cm, 12cm, 18cm, and 24cm respectively; Place test block III in the A area of the through groove of test block I, and place test block II in the c area of the through groove of test block I, at this time, III-c-1 groove and II-a-1 groove, III-c-2 groove and II-a-2 groove, III-c-3 groove and II-a-3 groove, III-c-4 groove and II-a-4 groove are combined to form four inclined open cracks with a width of 0.5cm, and the crack heights are 6cm, 12cm, 18cm, and 24cm respectively; II-b-1 groove, II-b-2 groove, II-b-3 groove, and II-b-4 groove are combined with the side of the through groove of test block I to form four vertical closed cracks with a width of 0.25cm, and the crack heights are 6cm, 12cm, 18cm, and 24cm respectively; Put the test block II in the A area of the test block I through groove, put the test block III in the C area of the test block I through groove, at this time III-a-1 groove and II-c-1 groove, III-a-2 groove and II-c-2 groove, III-a-3 groove and II-c-3 groove, III-a-4 groove and II-c-4 groove combination, form four width is 0.5cm's oblique closed crack, crack height is 6cm, 12cm, 18cm, 24cm respectively;III-b-1 groove, III-b-2 groove, III-b-3 groove, III-b-4 groove and the side of test block I through groove combination, form four width is 0.25cm's vertical open crack, crack height is 6cm, 12cm, 18cm, 24cm respectively; Put the test block II in the A area of the test block I through groove, put the test block III in the B area of the test block I through groove, at this time II-b-1 groove and III-d-1 groove, II-b-2 groove and III-d-2 groove, II-b-3 groove and III-d-3 groove, II-b-4 groove and III-d-4 groove combination, form four width is 0.5cm's vertical closed crack, crack height is 6cm, 12cm, 18cm, 24cm respectively;III-c-1 groove, III-c-2 groove, III-c-3 groove, III-c-4 groove and the side of test block I through groove combination, form four width is 0.25cm's oblique open crack, crack height is 6cm, 12cm, 18cm, 24cm respectively.

Images