A Crack Cause Analysis Method Based on Crack Development Shape
An analysis method and fracture technology, applied in the field of fracture origin, can solve the problems of lack of fracture development form and layer distribution, fracture development form, type lack of research, etc.
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Embodiment 1
[0034] Embodiment 1: a kind of crack formation analysis method based on crack development form, comprises the following steps:
[0035] 1) Obtain ground penetrating radar images around the crack;
[0036] 2) Obtain core samples at the edge of the crack, at the wheel track and in the middle of the lane, and observe the development of the crack;
[0037] 3) Cracks are classified according to their development patterns;
[0038] 4) According to the classification of cracks, the development form of each type, and the distribution of cracks in each layer of the pavement, the cause of cracks is analyzed from the stress characteristics of each structural layer of the asphalt pavement.
[0039] More specifically, when acquiring GPR images around cracks in step 1), proceed according to the following steps:
[0040] a) Determine the detection range of the GPR according to the length and area of the crack;
[0041] b) Lay out the detection route of the ground penetrating radar accor...
Embodiment 2
[0055] Example 2: Taking the "new reflection type" cracking in the classification of the upper and lower development type transverse joints as an example, starting from the stress characteristics of each structural layer of the asphalt pavement, such as figure 1 As shown in Fig. 1, the cause of cracks was analyzed according to the development form of this type of cracks.
[0056] According to the analysis, the development form of such cracks is due to the cracks in the semi-rigid base layer due to dry shrinkage and temperature shrinkage. As a result, the base cracks tend to expand upwards; secondly, after the base cracks, the integrity of the overall pavement structure decreases, and when the vehicle load approaches or drives away from the cracks, a relatively large vertical relative displacement occurs near the section due to the decline in the load transfer capacity, which in turn leads to road failure. The vertical shear stress near the surface is relatively large, coupled ...
Embodiment 3
[0057] Embodiment 3: Taking the "fatigue type" cracking in the classification of vertically developed transverse joints as an example, starting from the stress characteristics of each structural layer of the asphalt pavement, such as figure 2 As shown in Fig. 1, the cause of cracks was analyzed according to the development form of this type of cracks.
[0058]According to the analysis, the development form of this kind of cracks is due to the fatigue cracks generated by the repeated action of the base layer under the vehicle load. The integrity of the structure is reduced, and when the vehicle load approaches or leaves the crack, a large vertical relative displacement will occur near the section due to the decrease of the load transfer capacity, which will lead to a large vertical shear stress near the road surface, plus the temperature tensile stress of the road surface, The road surface corresponding to the cracked section of the base layer cracks; finally, under the influe...
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