Urban Roads，BridgesFlood Control (Monthly) Number 1 1，2013(Total Number 175) CONTENTS RoADSCoMMUNICATION Study on Scheme Selection of Cross section Design for Urban Elevated Expressway。 Zhou Hongxia,Zhao Binqiang(1) Abstract：With the construction of the elevated expressways in large cities，the traffic of cities is more convenient，but also brings a series of environmental problems，ie1ight，noise，automobile exhaust pollution and etcIn order to decrease the damage of elevated expressway on the existing environment，the reasonable crosssection scheme should be selectedAccording to the construction of the elevated expressway in Moshui Lake Road 1 of Wuhan，the article discusses the crosssection scheme selection of the urban elevated expressway by the comparative analysis method，and sums up some methods and experience for the scheme selection of cross-section design of urban elevated expressway Keywords：urban elevated expressway，cross-section design，pier in the middle，piers at both sides， doubledeck elevated road，scheme selection Study on Crosssection Design of Tianjin Outer Ring Line Northeastern Line ProjectZhu Bin。Song ring(5) Abstract：The crosssection design of urban road is the priority among the priorities in the urban road design According to the design practice of the northeastern line project，it is considered to standardize he description of the lane number and the statistics of the ring expressway lane numbers in the similar cities of China Aiming at the influence of the expressway reconstruction of the whole longterm outer ring line on the reconstruction of the existing outer ring line，based on the forecast and analysis results of traffic volume，and after the demonstration of many aspects，the crosssection design is carried out Keywords： outer ring line northeastern line，cross-section design，traffic capacity，service level， multifunctional lane Elementary Analysis on Intersection Traffic Design of Road and RailwayWang QingbinNiu Hongliang(9) Abstract：In recent years，the great progress has been made in the construction of infrastructures in China Especially,the construction of transportation has played the important role in the economic and cultural exchanges all over the countryOwing to the continuous extension of road and railway construction scale in China,there are the intersections of railway and road in some regionsIt is required to calTy out the special node designThe article sets forth some main aspects of position，type and safe protection for attention in the design of road and railwayThe relative experience can be referred for the similar projects Keywords：road，railway，intersection traffic，design Discussion of Gist to Select Material of Stress Absorbent Bed in Urban Road“CementintoAsphalt”Project Fu Cheng(11) Abstract：In recent years，the cementinto-asphalt method is a common scheme in the reconstruction of urban roadThe stress absorbent bed is a special pavement material in the cement into asphalt project，which can effectively delay and prevent the reflection crackThereforeit is often known as a key structure in the cement into asphalt projectThe article discusses the advantages and gist of three stress absorbent beds， 、 l which call be referred for the selecti0n of stress absorbent bed in the actual design of cementint。一asphalt projects Keywords：cement into asphalt，stress absorbent bed，material，advantage Analysis on Design Gist ofSMA Asphalt Mixture Yu Ya0，Chen Jin岛Kong Jian，Shi YaJ1g(13) Abstract：SMA modified asphalt pavement is widely used in the heavy load roads of expressway，bridge decks and airport runways because of its high strength，excellent temperature stabilitv and anti一8lide perfbrmanceBased on a large number of domestic and foreign literature and engineering cases，this paper analyzes and sums up the design methods and gist of SMA asphalt mixture，which can be referred for the similar projects Keywords：SMA modified asphalt，design of mixing rati0，control gist Study on Soft Foundation Treatment Scheme of Roads in Fill FieldXia0 Ga0xia，Yang Sha0men Hu Kun(1 6) Abstract： Relying on a s0ft foundation treatment project of矗ll filed in a county of Zheiiang Pr0vince，the article compares，selects and analyzes the soft foundation treatment methods of Il0ad common1v used in the fiU fields ti：om aspects of technology，economy，external environment，pipeline excavation and etcand finallv determines the methods of the plastic drainage plate+ovedoad prepressure treatment to be used in the s0ft foundation of the general road sections and the nailshaped doubleway cement mixing pile treatment to be used in the soft foundation of bridgehead road sectionsThe study conclusion can be referred f0r the similar projects Keywords：6U filed，soft foundation of road，plastic drainage plate，vacuum preloadin禹nail-shaped doubleway cement mixing pile Verification on