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| Discussion on Program for Building Railway in Plain Channelized Region and the Railway Alignment |
| ZHU Jian － nong，GUO Ye － qing，XU Hong － min，GUO Jian － sheng |
| Shanghai Design Institute of China Railway Group Ltd，Shanghai 200070，China |
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Abstract Research purposes: The section between Qidong and Nantong of the Nanjing － Qidong Railway is located in Nantong City，Jiangsu Province，along the downstream of the Yangtze River． The region along the railway is the plain channelized region with the dense population，the dense channelization and the developed highway network． With rapid development of regional economy and speeding up the path of urbanization，the demand of transportation is very high．Through analysis of the region features and the orientation of the project functions in the plain channelized region，the principle for the railway alignment is presented and the reasonable construction program is offered．
Research conclusions: The railway alignment in plain channelized region should be connected with the city plan． There are two programs for the railway alignment in this section． One is that the railway is on the south side of the Nanjing －Qingdao Highway and the other is that the railway is on the north side of the highway． For closely connecting with the local plan，making full use of the planed reserved passage，considering the influence of the projects on construction and the planned projects and ensuring the rationality of all projects，the program of the railway on the south side of the highway is recommended． Aiming at the region features that there are lots of houses，channelization networks，passages and there is a little soil resource，soil material and land resource with soft soil spreading widely，the boundaries of the track and bridge should be selected in combination with the geological conditions and the filling height，and the proportion of the bridge should be appropriately increased while the demolition and land occupation should be reduced．From the fields of the project investment，the project difficulty，the transport capacity and adaptability and economic evaluation，the comprehensive comparison of the single track program with double － track program is made． The program of building single track with reserved double － track condition is recommended． In order to cut the difficulty in building the double － track in future，it is proposed the beginning and end key projects of somestations should be set aside．
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Received: 29 June 2011
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2011, Vol. 28 
