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<跨度风格= “颜色：＃000000;”> <强> 挡土墙包含土壤和将它们保持在一个垂直（壁）结构的内表面后面的地方。当一个站点的等级提升大转变需要在很短的距离，在某些情况下，出于美观的原因挡土墙安装。由于包含在壁背后的土壤被捕获在一个几乎垂直的角度，这取决于壁的高度和土壤可以有巨大土壤压力本其必须仔细地设计为。此外，在土壤的包含在所述壁（被称为收费）的后面，如铺路或其他网站的改进，将有利于在挡土墙结构更大的负荷。所保持的土壤水分含量和足够的排水也是一个重要的考虑因素。 <强>声音障碍被构造成保护噪声敏感区域从噪音污染。 The most common application of sound barrier walls is to insulate residential communities from highway noise, although they are also installed along railways and around industrial work areas for similar reasons. They can also be used outside specific building locations to dampen the sounds of pad-mounted mechanical equipment, such as air conditioners. Sound barrier walls and noise pollution regulations came with increased vehicle traffic and greater public awareness in the 1970’s. Today, for example, the National Environmental Policy Act of 1970 still requires a noise analysis and barrier wall construction effort, if necessary, as part of federally funded highway projects. A more recent concern of sound barrier walls is that they be aesthetically pleasing and blend well within existing landscapes and communities.