【正文】 chain link panels are available. Our study area lies in the north of modern delta of the Huanghe River and it was formed by the river way of Diaokou in Huanghe River has the largest content of silt and may transport about The subdelta was built quickly under the supply of abundant sediments. The rapid accumulation in the delta always makes the river course to be diverted frequently. The abandoned delta would be eroded and retreated rapidly after diversion because the lack of supply. The gradient of the coastal slope in the delta is very gentle, the water depth is only 10m in the place about 10km apart from the coastal bank. A few of kilometerswide tidal flat would be exposed during ebb tide that makes us work on the tidal flat conveniently. The sediments on the tidal flat are mainly posed of fine sands, silt and clay. With the development of economic construction, various kinds of modernized traffic facility, is it pay to set up such as expressway , city, overpass function blown strengthen day by day in munications and transportation, the development of and the munications and transportation has caused the rapid rising of the traffic accident, traffic Safe and own through being a great world difficult problem The rigidity guardrail is offended the guardrail form not basically out of shape by the automobile, generally point the concept of adopting safe appearance of guardrail of modes in Chinese operatic music of concrete wall of concrete guardrail , through the different sides of slope of appearance mainly, make the automobile moderate , it is high to climb, change direction, last making not colliding kinds of guardrail angle smaller than 100 car not mediumsized making a change effective to, make automobile receive lighter damage, as angle of colliding, collide when relatively heavy speed having, the automobile damages seriously. According to rigidity with can divide into flexible guardrail , semirigid guardrail and rigidity guardrail safe form of guardrail. 1)The flexible guardrail generally points the cable guardrail , is one kind with structure that fixes of many roots on the pillar of cable of exerting prestressing force, totally relying on the stress of drawing of the cable to resist the vehicle and collide, the form is beautiful , not oppressing the sense while going, but the sight leads worse, the fabrication cost is relatively high, do not generally use. 2)The semirigid guardrail generally points the roof beam type guardrail , is a kind of roof beam type structure fixed with the pillar , depend on the guardrail crooked and out of shape and a pulling force resist the collision of the vehicle. There are a lot of kinds of the roof beam type guardrail , use the most extensive one to be the roof beam guardrail of the wave form . Have certain rigidity and toughness, easy to change after damaging, can lead the sight , the appearance is beautiful . 3)The rigidity guardrail generally points the cement concrete wall type guardrail , is a kind of concrete wall type structure of cement with certain section form , rely on the automobile to climb high , out of shape and rubing to absorb the energy of colliding . The guardrail security high, can prevent two accident effectively, itself difficult to damage, the maintenance cost is low, but have sense of oppressing to go to the vehicle, it is relatively serious to damage the vehicle. Security guardrail of expressway should prevent highspeed vehicle that go from exceed outlet, pass through central authorities is it is it is it to lane , can lead the driver39。s own the automobile and semirigid guardrail and contact and friction each other even more. In a word , have not considered any coupling dynamics phenomenon . Obviously, the essence that the designing technique of semirigid guardrail received like this can not reflect the question , result its unfavorable to special, great malignant traffic accident prevent and cure improvement of petence. We think , two inalienable ponents in the system that the automobile and semirigid guardrail collide in the automobile bumps into this incident of semirigid guardrail , the mutual coupling of two , influencing each other , form an organic whole together. While the automobile bumps into the semirigid guardrail , the automobile will keep in touch with the semirigid guardrails , and position and area of contact that are exposed to will change with sport of the automobile , the contact area changed will produce the contact strength and frictional force changed changed , under acting on monly in contact strength and frictional force changed of changing, semirigid guardrail and automobile car body structure will take place size and whom position change heavy and out of shape (this kind is big and out of shape and often closely related to the emergency rate effect of the material and inertia effect), This kind heavy to can cause new contact while being out of shape (including automobile car body structure and semirigid guardrail are one39。s evacuating safely and staff members and equipment security. When the train blocks the trouble, can maintain passenger39。 3)While colliding , the damage to the passenger is the minimum degree: 4)Can lead the sight of the persons who drive . Can be found out from abovementioned functions, the guardrail must have suitable intensity of mechanics and collision in order to keep out the vehicle of rigidity , prevent the vehicle from crossing outside of outlet (the bridge ): Meanwhile, rigidity of guardrail can too heavy, can is it injure or lighten the degree of injuring to protect passenger from better. Real car full size is it is it offend with actual automobile guardrail is it imitate a kind of research approach of traffic accident to e to test to bump into. It can get automobile sport orbit and sport postu