非洲热带地区红土砾料在公路工程中的应用

发布时间：2018-03-25 23:06

本文选题：红土砾料　切入点：非洲　出处：《中外公路》2015年S1期

【摘要】：红土砾料是一种在非洲热带地区广泛分布的粘性土与碎砾石的天然混合料,形成于旱雨二季交替循环的气候条件下。从试验分析表明:红土砾料浸水4d95%OPM压实度时的CBR基本上大于30%,按照热带国家路面尺寸实用指南中土的承载力分级,属S5级,是一种承载力良好的筑路材料。工程实践表明,红土砾料在公路工程中的用途广泛:采用红土砾料填筑的路基,其强度高、水稳定性较好;PST层(路基上部,相当于国内的路床)可采用红土砾料填筑,若红土砾料的天然含水量较大或IP较高,可掺加生石灰(如没有也可用熟石灰)进行改良;除高速公路外的其他等级公路,底基层可采用天然红土砾料或水泥(石灰)处理红土砾料;除高速公路外的其他等级公路,基层可采用水泥或石灰处理红土砾料;此外红土砾料还可用于填砂路基的包边防护以及土质排水沟与边沟的铺面。
[Abstract]:Red soil gravel is a natural mixture of clay and gravel widely distributed in tropical Africa. Under the climatic condition of alternate cycle of dry and rainy seasons, the experimental analysis shows that the CBR of red soil gravel is basically greater than 30 when the compaction degree of 4d95%OPM is immersed. According to the classification of bearing capacity of middle soil in the practical guide of road surface size for tropical countries, it belongs to S5 grade. The engineering practice shows that the red soil gravel is widely used in highway engineering: the embankment filled with red soil gravel material has high strength, good water stability and PST layer (upper part of the roadbed). If the natural water content of red soil gravel is higher or IP is higher, it can be improved by adding quicklime (if no lime is also available); other grade roads other than highway, can be improved by using red soil gravel as the equivalent of road bed in China, and if the natural water content of red soil gravel is higher or IP is higher, it can be improved by adding quicklime (if not available). The natural red soil gravel or cement (lime) can be used to treat the red soil gravel in the base course, and the cement or lime can be used to treat the red soil gravel material in the base course except for other grade highways except the highway. In addition, the red soil gravel can also be used to protect the embankment of sand filling and the pavement of soil drainage ditch and side ditch.
【作者单位】：中交第一公路勘察设计研究院有限公司;
【分类号】：U414

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