平原河网化地区新建铁路建设方案及选线探讨

Discussion on Program for Building Railway in Plain Channelized Region and the Railway Alignment

研究目的:新建铁路宁启线南通东至启东段位于江苏省南通市境内。沿线为长江下游平原河网化地区,人口稠密,河网密布,公路网发达,随着地区经济快速发展、城镇化步伐加快,对交通基础设施需求旺盛。通过对平原河网化地区特征和项目功能与定位的分析,确定线路选线原则,提出一个合理的建设方案。研究结论:(1)平原河网化地区线路选线应与地区城市规划相衔接。(2)本段线路走向有宁启高速公路南北侧两个方案,从与地方规划紧密结合,充分利用规划预留的通道,并考虑在建及规划项目的影响,确保各项工程的合理性等方面综合分析,推荐采用宁启高速公路南侧方案。(3)针对平原河网化地区房屋多、水网多、通道多、土源少、地材少、土地资源紧张、软土分布广等地区特征,线路选定路桥分界时,应结合地质条件、填土高度,适当增加桥梁比重,减少拆迁、节约用地。(4)从工程投资、工程实施难度、运输能力适应性及经济评价等多方面对单复线建设方案进行综合比选,推荐采用单线平面预留双线方案。(5)为减少今后复线施工的难度,提出对部分车站头尾重点工程应作工程预留。

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 ehannelized 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.