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首页> 外文期刊>Canadian Geotechnical Journal >Deformational behavior of fouled railway ballast
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Deformational behavior of fouled railway ballast

机译：污染的铁路道ast的变形行为

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Plastic strain of railway ballast subjected to various fouling conditions was determined under simulated traffic loading through testing with large-scale cyclic triaxial equipment. Mechanisms by which fouling material affects the plastic strain of railway ballast were investigated. Fouling content (% by weight of particles <12 mm) increased the plastic strain of ballast by contaminating the contact points of ballast particles. Increasing moisture (>3%) resulted in larger accumulation of plastic strain in fouled ballast under traffic loading. Soil-suction tests showed that plastic strain of fouled ballast with suction >2000 kPa is similar to that of clean ballast, regardless of fouling and moisture content. For noncohesive fouling material (mineral and coal fouling), plastic strain is affected by fouling and moisture; therefore, a noncohesive fouling index (NFI) is proposed. In cohesive (clay) fouling, plastic strain is controlled by moisture and fouling content, as well as compositional characteristics of the cohesive fouling material, primarily represented by Atterberg limits and % mass <0.075 mm. A cohesive fouling index (CFI) is proposed to characterize the deformation of cohesive fouled ballast.
机译：通过使用大型循环三轴设备进行测试，在模拟交通负荷下确定了各种污染条件下铁路道ast的塑性应变。研究了结垢材料影响铁路道ast塑性应变的机理。结垢含量（<12 mm颗粒的重量百分比）通过污染压载物颗粒的接触点而增加了压载物的塑性应变。在交通负荷下，增加的水分（> 3％）会导致在受污染的压载物中产生更大的塑性应变累积。吸尘试验表明，吸力> 2000 kPa的结垢镇流器的塑性应变与干净的镇流器相似，而不论结垢和含水量如何。对于非粘性结垢材料（矿物结垢和煤结垢），塑性应变受结垢和水分的影响;因此，提出了非粘性结垢指数（NFI）。在粘性（粘土）污垢中，塑性应变由水分和污垢含量以及粘性污垢材料的成分特性（主要由阿特伯格限值和质量百分比<0.075 mm表示）控制。提出了一种内聚结垢指数（CFI）来表征内聚结垢压载物的变形。

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