The Force Characteristics And Design Method Of Cement Concrete Pavement On Steep Slopes And Sharp Turns Section

It's cement concrete pavement that is suitable for the more plateau and the more mountain in the western of china instead of asphalt concrete pavement that is not fit for steep slopes road, because it has lager bearing capability and wear resistant. The mountain roads that have great gradient, low standard of road alignment and lots of sharp turns are especially difficulty to design, construct and maintain, thus it is necessary to analysis the cement concrete pavement's mechanics response of steep slopes and steep-sharp turns. On that basis, it offers some advises to the design of mountain road, so that we can ensure the road quality, lengthen the road service life and to increase the cost for road construction and maintenance。As far as the problems being talked above, some researches have been done in this paper. Firstly, indoor models of cement concrete pavement has been tested under 0%, 6% , 9%, 12% slopes, especially. The change rule of stress forced on the surface and the thickness direction under the central part in longitudinal joint of the slab is analyzed under different loads acting on upside corner and middle of the slab. In addition, the results of the experiment can be used to correct the finite element model, also. Secondly, the properties of steep slopes and steep-sharp turns road with different slopes and radiuses were analyzed based on the different structures of cement concrete pavement. Main conclusions are reached as follows:①The maximum tension stress of the central part in longitudinal joint and maximum shear stress under slab of the experiment result are smaller than the result of finite element simulation, but they have the same change rule.②For the straight line road, the tension stress of the calculation point, different concrete surface and bases, all decrease, and the shear stress of the slab bottom and slab surface increase rapidly, along with the slope increasing.③For the sharp turns and steep-sharp turns road, the tension stress of the calculation point , different concrete surface and bases, all decrease, and the shear stress of the slab bottom and slab surface increase rapidly, along with the slope increasing or the decreasing of the curve radius.④The critical position of the steep slopes road, is still on the central part in longitudinal joint, no changing along with the change of factors, such as slope. ⑤This paper gives range of the steep slopes and steep-sharp turns, baseed on comprehensively analyzing.⑥Based on the above analysis, the force characteristics of the steep slopes road, steep-sharp turns road and ordinary road were comparatively analyzed and thus propose the cement concrete pavement design method of the steep slopes and steep-sharp turns road force characteristics.