Study Of Pavement Structure Inside Highway Tunnel Based On Environment Factors

Recently, tunnel mileage increase gradually with the rapid development of highway construction. There are more and more concerns about the selection of tunnel pavement structure because the structural design of tunnel pavement according to the ordinary design method cannot accommodate the actual situation. This dissertation thoroughly study the issues about the pavement structure and material, design optimization of noise reduction by quantitatively analyze the environment of temperature, traffic noise, lighting inside highway tunnels. The results offer theoretical basis for pavement design and materials selection in tunnels.The research in this paper consists of some aspects as follows:(1) In order to breakthrough the traditional measurement situation, the finite element method(FEM) was developed to calculate and contrast the air temperature inside long and short highway tunnel,and analysis the factors result in the differences. (2) Only two kinds of heat conduction between the pavement and its surroundings are considered, including air heat flow and the radiation between air andpavement by contrasting the factors affecting the pavement temperature field inside and outside tunnels. The FEM also was used to analysis such pavement temperature field indics as temperature, thermal gradient and temperature changing velocity inside long and short tunnels,and the result can offer theoretical basis for pavement design and materials selection in tunnels. (3) The sound field characteristic inside highway tunnel was analysed and put forward a simple and applicable traffic noise prediction method---modified coherent model which was compared to incoherent model and ASJ model used internationally. Especially the three theoretical prediction value and measurement was discussed in two cases as fixed sound sourse and rigid boundary,mobile sound sourse and absorbtion materials set in boundary, which prove the modified coherent model prediction method cound be used to optimize noise reduction design. (4) In order to improve the economic effect of noise reduction and save contruction materials, design optimization of noise reduction inside highway tunnel was carried out by constructing scale model and field measurement. The research include the influence of noise reduction in five locations and three amounts of the absorption materials,and proposed the optimum location and amount of absorption materials and absorption structures. (5)The asphalt pavemen structure with anti-slide, noise reduction, fire-retarded and glistening proformances was recommended and study the design parameters of the mixture from satisfying the function of tunnel pavement use, particularly with an emphasis on researching the influence on mixture voidage, the pavement performance and reflection when different rate and diameter glass bead appended into asphalt mixture and put up the best appending program. The result has important application value on increasing the effect of tunnel illuminance and promoting energy saving and emission reduction. (6)The groove cement pavement structure with anti-slide and noise reduction performance was put up in this paper, and combined with indoor experimen to optimum grooving parameters and put forward the best program including the groove oritention, pattern, width, depth and internals. All the research result have been put into application and examined successfully in testing road.