摘要研究目的:埃塞俄比亚在建亚的斯亚贝巴至吉布提铁路Seheta - Dire Dawa段，地处东非大裂谷内，为火山喷发物覆盖，地表广泛分布黑棉土，多具强膨胀性，对铁路工程影响大。黑棉土的胀缩特性及大气影响深度直接影响路基设计措施和路堑换填深度，进而影响工程设计质量和投资。因此，有必要对黑棉土的胀缩特性及大气影响深度进行研究，为黑棉土地段路基设计提供依据。
Abstract：Research purposes; In Ethiopia , the constructed Sebeka-Dire Data section of Addis Ababa-Djibouti Railway, is located in the East African Rift Valley covered by volcanic material, and its surface is widely distributed with black cotton soil which has strong expansibility, as a result, the railway engineering has been greatly influenced. The swell-shrink characteristics of black cotton soil and the depth of it influenced by the atmosphere will directly affect sugared design measures and the replacement depth of cutting, which will further affect the quality and investment of engineering design. Therefore，the proposed research on the swell-shrink characteristics of black cotton soil and the depth of it influenced the atmosphere is necessary，which provides design basis for sub grade of black cotton soil section.
Research conclusions:(1)The black cotton soil of Ethiopia has following characteristics: small natural density & dry density，big natural void ratio，high free swell ratio，high montmorillonite content & canon exchange capacity，organic matter(loss on ignition) and strong expansibility, etc.(2)In rainy season, the soil is mainly shown as compression when there is load; in dry season, it has relatively strong expansibility under the condition of immersion.(3)The depth of black cotton swell soil area influenced by the atmosphere is 3. 5m and the depth of it distinctly influenced the atmosphere is 1 .6 m.(4)This article will be a reference to geological survey and subgrade design of other similar projects.
赵平 徐正宣 唐林 曾德礼. 埃塞俄比亚黑棉土胀缩特性及大气影响深度研究[J]. 铁道工程学报, 2014, 31(4): 47-51.
ZHAO Ping，XU Zheng-xuan，TANG Lin, ZENG De-Ii. Research on the Black Cotton Soil Swell-shrink Characteristics and the Depth of Black Cotton Soil Influenced by the Atmosphere in Ethiopia. 铁道工程学报, 2014, 31(4): 47-51.
Zhang Kun, Guo Jubin, Li Jianqiang. Countermeasure and Problems of Newly-built Ethiopian Railway[J」.Journal of Railway Engineering Society , 2011(10 ) :40-43.
2014, Vol. 31 
版权所有 © 2014 《铁道工程学报》编辑部