Determination method of equivalent shear stiffness between layers of cement concrete pavement base-surfacing
A technology of cement concrete and shear stiffness, applied in the direction of measuring devices, instruments, and mechanical devices, can solve the problem that the interlayer shear stiffness cannot reflect the stress state of the road surface, cannot consider the normal compressive stress, and cannot reflect the shear surface Differences in shear stress, etc.
Active Publication Date: 2017-06-09
SHANXI PROVINCIAL RES INST OF COMM +1
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Problems solved by technology
However, practice has proved that there are two main problems with the current test equipment: one is that there are obvious size effects in the isolated test of small-sized specimens, and it cannot reflect the interlayer interaction of the wide band structure; the other is that the normal compressive stress cannot be considered , and cannot reflect the difference in shear stress caused by the difference in normal compressive stress on the shear plane
Therefore, the obtained interlayer shear stiffness cannot reflect the stress state of the actual pavement, and it will have many negative effects when used in the structural design of cement concrete pavement
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[0051] see figure 1 , the invention provides a method for determining the equivalent shear stiffness between cement concrete pavement base-surface layers, the method for determining the equivalent shear stiffness between the cement concrete pavement base-surface layers comprises the following steps:
[0052] 1. Based on the Coulomb friction model, use a horizontal shear tester that can simulate vertical loads to measure the average shear stiffness between the base and surface layers of cement concrete pavement;
[0053] First, a cement-stabilized macadam base 3 of 70cm×70cm×20cm is formed. After the curing is completed, the interlayer (between the cement-stabilized macadam base 3 and the cement concrete surface layer 4) is treated with emulsified asphalt, and then combined as shown in Table 1. For example, pouring a 60cm×60cm×25cm cement concrete surface and curing.
[0054] Table 1 mix ratio
[0055]
[0056] Place the cement-stabilized gravel base 3 that has been cured ...
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The invention provides a method for determining interlayer equivalent shear stiffness between base layer and surface layer of a cement concrete pavement and a horizontal shear tester. The horizontal shear tester capable of simulating vertical load comprises a fixing device, a loading device, a measuring device and a servo device, wherein the base layer of the cement concrete pavement is arranged in the fixing device; the surface layer of the cement concrete pavement is arranged on the upper surface of the base layer of the cement concrete pavement; the loading device and the measuring device are respectively arranged on the surface layer of the cement concrete pavement; the servo device is respectively connected with the loading device and the measuring device. The horizontal shear tester is capable of reflecting the difference of vertical pressure stress on the shear surface, displaying the size of the actual interlayer shear surface and providing accurate calculation parameters for structural analysis of the cement concrete pavement.
Description
technical field [0001] The invention belongs to the technical field of highway and urban road cement concrete pavement, and relates to a method for determining the equivalent shear degree between layers, in particular to a cement concrete pavement base-surfacing layer that can be used in the design of highway and urban road cement concrete pavement The determination method of equivalent shear stiffness and the horizontal shear tester. Background technique [0002] In the analysis theory and design method of cement concrete pavement structure, the stress analysis and calculation of surface course and base course is a very important basic research work. [0003] The structural analysis of cement concrete pavement is based on the theory of elastic ground slabs. The establishment of this theory is based on the following three assumptions: 1) the concrete slab is an elastic body of equal thickness; 2) the vertical compressive strain and the The influence of shear strain; 3) The ...
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IPC IPC(8): G01N19/04
Inventor 张艳聪刘少文张翛高玲玲
Owner SHANXI PROVINCIAL RES INST OF COMM