山区高速公路改扩建不同设计方案环境影响比较

山岭重丘区高速公路改扩建，不同的设计方案对环境的影响和破坏程度是有差异的。文中分环境要素比较了山岭重丘区高速公路改扩建不同设计方案对环境的影响程度。通过分别比较不同的建设方案、不同的改扩建路基形式、不同的路基加宽方案对环境的影响程度，提出对于山岭重丘区高速公路改扩建，在现有路线通道尚未充分发挥其潜能的情况下，尽量选择改扩建方案，以避免新建复线工程对环境的破坏影响；路基改扩建形式以单侧整体式路基加宽为宜，同时结合实际地形、地质情况，对不宜采用整体式加宽的局部路段，采用单侧分离式路基加宽形式。

Comparison of Environmental Effects of Different Freeway Broadening Design Schemes in Mountainous area

Different design schemes for freeway broadening in mountainous area have different effects on environments. Environmental effects of different construction projects, roadbed shapes and broadening schemes etc. are compared. It is proposed that scheme of broadening should be applied as far as possible if the existing road has not developed its potential functions sufficiently so as to avoid effects of rebuilding new freeways on damage of environments. And it is considered that integrated scheme of broadening at single side should be chosen for roadbed shape and separated scheme of broadening at single side should be adopted by combining with actual terrain and geology conditions for the sections of the road where integrated scheme of broadening is not suitable.