1、surface, will divide into longitudinal and the crosswise two kinds in the horizontal force. Moreover, the road surface will also receive vehicles vibration power and the impact action of force, behind the automobile body also the cavitation suction function. Under the above each kind of external for
2、ces combined action, in the pavement structure will have the size different compressed stress, the tensile stress and the shearing stress. If these stresses have surpassed the pavement structure whole or some part of composition intensity, the road surface will have the settlement, the wave, the bre
3、ak, loose and phenomena and so on attrition. Moreover, the pavement structure reveals in the atmosphere and the natural environment, will receive the temperature and the moisture content change influence frequently, its mechanical properties unceasingly will also change along with it, the intensity
4、and the rigidity are unstable, state of roads also uneven performance. May know by the above analysis, must take the suitable measure to prevent and to handle these plant diseases uninterruptedly, maintains the road surface has certain intensity, the rigidity and the stability, maintains the pavemen
5、t structure has ability which the enough anti-fatigue strength as well as the anti-aged distortion accumulate, guarantees its durability; And causes the road surface to be smooth, to be complete, the crown is moderate, draining water is unimpeded, the driving is smooth, is safe.The first chapter int
6、roduction the automobile goes in the road surface, besides overcomes each kind of resistance, but also passes to through the wheel the vertical force and the horizontal force the road surface, will divide into longitudinal and the crosswise two kinds in the horizontal force. Moreover, the road surfa
7、ce will also receive vehicles vibration power and the impact action of force, behind the automobile body also the cavitation suction function. Under the above each kind of external forces combined action, in the pavement structure will have the size different compressed stress, the tensile stress an
8、d the shearing stress. If these stresses have surpassed the pavement structure whole or some part of composition intensity, the road surface will have the settlement, the wave, the break, loose and phenomena and so on attrition. Moreover, the pavement structure reveals in the atmosphere and the natu
9、ral environment, will receive the temperature and the moisture content change influence frequently, its mechanical properties unceasingly will also change along with it, the intensity and the rigidity are unstable, state of roads also uneven performance. May know by the above analysis, must take the suitable measure to prevent and to handle these plant diseases uninterruptedly, maintains the road surface has certain intensity, the rigidity and the stability, maintains the pavement structure has ability which the enough anti-fatigue s湿地、关注生活的环境、支持政府合理的开发和利用湿地为民造福的各项政策，做家乡的小主人，为家乡的建设做出应有的贡献。8
