Research On Drainage Performance And Design Of Drainage Structure On The Porous Asphalt Pavement

The surface stream can form a piece of film on the traditional dense-graded asphalt pavement, which can cause floating of vehicles. The waterfog bespattered by wheels is dizzy under great-light, which may also affect to safety of driving. The porous asphalt pavement has good stability of construction and preferable function of slide-proof, which can assure driving-safety. At present, there is no systemic and wide-range research on the porous asphalt pavement in China yet. Therefore, study on the mechanism of drainage of this kind of pavement, the method of improving on the function of drainage can be found out consequently. It is very important and necessary to carry on this kind of study for the applying and extending of the porous asphalt pavement. And, it can be reference for farther study aftertime.We use the theories in hydraulics relate on seepage in the soil for reference, analyse the macrocosmic and microcosmic process of seepage in the porous asphalt pavement, found the model of seepage in the draining-layer of the porous asphalt pavement according to the real boundary-condition, derive a equation of soakage-line of the draining-layer making use of the Boussinesq equation, analyse the factors the equation involved one by one with mathematic method and associate the factors together with the maximum of the thickness of groundwater in the draining-layer, find out the extent of effect on the function of drainage of the porous asphalt pavement each factor can cause, afford methods of improving on the function of drainage theoretically.When considering on the function of drainage of some kind of mixture, it has to consider on the infiltration coefficient of this kind of mixture. The method to measure the infiltration coefficient these days in China is not the same with macropores mixture. So, we develop a new set of instruments by ourselves and use them to measure the coefficient of macropores mixture. At the same time, the orderlinesses are summed up during the process of experiments, improvements on measurement are made accordingly. After having numbers of experiments and analyses, the equation of the relationship between interspace-rate and infiltration coefficient is concluded, which afford reference for design and calculation of the function of drainage.To apply the academic result to actual design and calculation, we calculate the drainage ability and design the attaching facilities of some different kinds of construction. The design and calculation of subsurface drainage system of the porous asphalt pavement is concluded accordingly, and the reference and example is afforded.At last, some advices and assumptions are made to some kinds of special construction.