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在我国西北地区,解放后先后在黄土地区修建了天兰、包兰、兰青、兰新、西韩、西侯、铜王、白宝等铁路。凡以黄土作填料的路堤,竣工后均产生不同程度的下沉,个别严重的高达2米多。因下沉严重,随之引起了:路肩宽度不够,道床边坡溜坍,轨道不稳定,起道工作量大,行人、维修作业不便,有些地段还不得不增设挡碴墙和路基帮宽等工程。一般当其它条件相同,其下沉量随填土高度而增大,在U型和V型沟谷中,沟床中部填土高于两端,因而易形成不均匀下沉。当不均匀下沉量超过一定限度时,势必破坏土体的完整性,引
In the northwestern region of our country, Tianli, Baolan, Lanqing, Lanxin, West Han, Xihou, Tongwang, Baibao and other railroads have been built in the loess area after the liberation. Where the loess as a filler embankment, have been completed after the sink to varying degrees, some serious up to 2 meters. Because of sinking serious, ensuing: shoulder width is not enough, bed slope slipped, orbit instability, starting a large workload, pedestrians, maintenance and operation inconvenience, and some lots have to add blocking ballast walls and subgrade width And other projects. Generally, when the other conditions are the same, the subsidence increases with the filling height. In the U-shaped and V-shaped valleys, the filling of the middle of the ditches is higher than the two ends, and thus the uneven sinking tends to occur. When the uneven amount of subsidence exceeds a certain limit, is bound to undermine the integrity of soil, lead