公路工程第三次功课(国外英文资料).doc

公路工程第三次作业(国外英文资料) Assignment 1 One question What are the basic elements of the plane line and vertical line of the highway? A: a flat line is made up of basic elements such as a straight line, a circular curve, and a tempering curve. The longitudinal profile is composed of basic elements such as straight lines and vertical curves. What are the two types of pavement? A: two kinds of flexible road and rigid road surface. What are the three types of traffic signs? A: there are indications, warning signs and ban signs. What is the main consideration when determining the radius of a circle? Answer: consider allowable maximum lateral force coefficient and maximum ultra high rate. When the minimum length of the mitigation curve is determined, what factors are considered? Answer: the calculation of the rate of change of the centrifugal acceleration, the calculation of the time of the reaction time of the driver, and the high rate of change of the outside lane. What are the three common combinations of flat wire combinations? What is their applicability? Answer: the basic form, in line with the curve - the curve of the curve - the curve of the curve - the curve of the curve - the order of the curve The S is a combination of two reverse circular curves connected by a tempering curve The oval shape, which is used to connect two conformed circles to a curve What is the difference between the maximum longitudinal, the lowest longitudinal, the average longitudinal and the composite slope? Answer: the maximum slope is the maximum slope value that the highway allows at the design of longitudinal slope, which is an important control indicator of highway profile design. The control of the maximum slope in the rugged terrain will directly affect the length of the route, the use of quality, the cost of transportation and the cost of the project. In long cutting, fill and other horizontal drainage unobstructed road, in order to ensure the drainage requirements, prevent water infiltrati