Faulting Development On Joint Plain Concrete Pavement Based On MMLS3

Faulting is a typical disease of joint plain concrete pavement(JPCP).The height difference between two slabs directly affects the driving comfort and reduces the pavement performance.In order to reduce the adverse effects of faulting,it is necessary to study the evolution of faulting,which will help to further improve the formation mechanism of faulting on JPCP and grasp the law of development of faulting.In this paper,combined with the third-scale Model Mobile Loading Simulator(MMLS3),starting from the tiny void area at slab bottom of transverse joint of JPCP,theoretical analysis,laboratory test and numerical simulation were combined to study the faulting evolution of JPCP.The research content and main results are as follows:1.Starting from the tiny void area at the bottom of transverse joint of JPCP,the variation characteristics of the transient dynamic water field were analyzed,and the mechanism of hydrodynamic pressure at slab bottom was studied.Based on the characteristics of water scouring at transverse joint of JPCP,the formation mechanism of JPCP under the coupling of alternating load and transient dynamic water field was studied.2.Based on similarity theory and Saint-Venant principle,considering the loading conditions of MMLS3,finite element(FE)method was used to construct the reduced-scale pavement model,and the scale ratio of JPCP model was determined.3.According to the scale ratio of the reduced-scale pavement model,the structure pavement model with cement stabilized macadam base was paved.According to the actual void form,The tiny void area and hydrodynamic pressure sensor is arranged in the base location corresponding with the middle of the edge of joint,laboratory test of hydrodynamic pressure in the tiny void area at slab bottom was carried out using MMLS3,and the hydrodynamic pressure data at slab bottom were collected and the variation of hydrodynamic pressure under different axle load times ws analyzed.4.Based on FE method and Coupled Eulerian-Lagrangian method,the pavement FE model under different test conditions was established according to the parameters in the orthogonal table by orthogonal design.Analysis of variance and multiple comparison was used,and the main factors affecting the hydrodynamic pressure at slab bottom were analyzed.5.The lime-fly ash soil base model pavement with void in the middle of slab edge and void in slab corner was paved,and the test of faulting on JPCP was carried out using high-speed camera based on MMLS3.The influence of the formation and development of faulting was studied based on different test conditions,and the characteristics of the evolution of faulting were revealed under the action of water and complex loads.Based on FE method,the faulting analysis model under void area at the bottom of joint of JPCP was established,and the hydrodynamic pressure effect of water on the base was introduced by predefined field,and the numerical simulation of faulting development was carried out.In this paper,through the laboratory test of hydrodynamic pressure at slab bottom,the laboratory test of faulting on JPCP,and numerical simulation of faulting on JPCP,it has guiding significance for the research on the development law of JPCP,and it has important practical application value for the prevention and control of JPCP.