多车道高速公路改扩建项目路基断面组成方法

Composition Scheme of Subgrade Section of Multi-lane Expressway Renovation and Expansion Project

以连霍高速(G30)新疆境内小草湖至乌鲁木齐段改扩建工程为例,从规范运用、运营安全、借鉴类似项目及工程规模等方面,对多车道高速公路断面各组成部分的宽度进行了分析与论证。具体项目横断面形式选择为:八车道及以上高速公路整体式路基可不设置左侧硬路肩;八车道及以上高速公路分离式路基,结合地形及救援条件,可论证选择左侧硬路肩宽度。经论证,在保证安全的前提下,改扩建项目路基断面中各组成部分宽度可采用规范的最小值。

Based on the renovation and expansion project of the Xiaocao Lake-Urumqi section in Xinjiang of the Lianhuo Expressway （G30）, the width of each part in the subgrade section of the multi-lane expressway was analyzed and demonstrated from the aspects of the specifications operational safety, reference to similar projects and project scale. The cross-sectional forms should be chosen as follow., for expressway with eight lanes or more and integral subgrade, the setting of the left side of the hard shoulder is spared- for expressway with eight lanes or more and separated subgrade, the width of the left side of the hard shoulder should be chosen by considering the terrain and rescue conditions. According to the demonstration, under the premise of ensuring safety, the width of each part in the subgrade section of the renovation and expansion project can adopt the minimum value from the specification.