•  
  •  
 

Abstract

In order to find out the engineering properties of African shell soil and propose its rational use in highway construction, based on a planned highway project in Senegal, an experimental study was carried out to analyze the particle composition, physical properties, chemical properties, engineering properties, mechanical properties, and salinability of shell soil along the route. According to the method in French standards, the soil quality was classified, and the application proposal for subgrade filling was given. The results show that the shell soil is composed of coarse particles with a particle size of 1–40 mm, shell and sand mixture with a particle size of 0.5–1 mm, and sand with a particle size of less than 0.5 mm, with a mass percentage of 14%, 5%, and 81%, respectively. It has a certain engineering grading and can be classified as granular materials. Coarse-grained components and mixtures of shell and sand in shell soil are hard and have high mechanical strength, and the California bearing ratio (RCBR) is much higher than that of sand. The plastic index of sand in shell soil is only 4, and the plasticity is low; the main chemical components are quartz and a small amount of stone salt, indicating a certain saline-alkali property. The total salt content of shell soil is 0.73%, which can be judged as chlorine saline soil, and the salinization degree is medium saline soil. According to the classification method of soil quality in French standards, the shell soil in Senegal can be classified as A1ts, which can be used as the subgrade filling material of the planned highway after taking corresponding measures.

Publication Date

1-18-2024

DOI

10.14048/j.issn.1671-2579.2022.06.039

First Page

206

Last Page

209

Submission Date

May 2025

Reference

[1] 周大全, 甄玉凤. 非洲热带地区红土砾料在公路工程中的应用[J]. 中外公路, 2015, 35(S1): 124-127.ZHOU Daquan, ZHEN Yufeng. Application of red clay gravel in highway engineering in tropical Africa[J]. Journal of China & Foreign Highway, 2015, 35(S1): 124-127. [2] 张瑞菊, 王国康, 白墨. 非洲天然红土粒料的路用性能及使用标准[J]. 交通科技, 2017(1): 23-26. ZHANG Ruiju, WANG Guokang, BAI Mo. Transportation Science & Technology, 2017(1): 23-26. [3] 曹长伟, 罗志刚, 钱劲松. 西非马里地区级配红土粒料的室内试验研究[J]. 中外公路, 2015, 35(5): 54-57. CAO Changwei, LUO Zhigang, QIAN Jinsong. Journal of China & Foreign Highway, 2015, 35(5): 54-57. [4] 李涛, 刘楠, 毛剑影. 法国规范体系下的填砂路基设计与施工探讨[J]. 山东交通科技, 2017(5): 76-77, 93.LI Tao, LIU Nan, MAO Jianying. Discussion on design and construction of subgrade filled sand under French specification system[J]. Shandong Jiaotong Keji, 2017(5): 76-77, 93. [5] 石崇喜, 黄英, 杨玉婷, 等. 掺砂红土的力学特性及掺砂机理研究[J]. 工程勘察, 2011, 39(4): 1-8.SHI Chongxi, HUANG Ying, YANG Yuting, et al. Research on mechanical properties and sand-doped mechanism of the laterite improved with sand[J]. Geotechnical Investigation & Surveying, 2011, 39(4): 1-8. [6] 吴海城. PST技术在阿尔及利亚东西高速公路中的应用[J]. 山西建筑, 2012, 38(30): 165-167. WU Haicheng. On application of PST technique in east-west expressway in Algeria[J]. Shanxi Architecture, 2012, 38(30): 165-167. [7] 李立, 张晟斌, 李小平, 等. 刚果(布)国家1号公路设计简介[J]. 中外公路, 2010, 30(2): 13-17. DOI: 10.14048/j.issn.1671-2579.2010.02.042.LI Li, ZHANG Shengbin, LI Xiaoping, et al. Brief introduction of Congo (Brazzaville) national highway No.1 design[J]. Journal of China & Foreign Highway, 2010, 30(2): 13-17. [8] 齐元新. 中国与法国规范下土方填料分类及使用条件对比[J]. 铁道建筑技术, 2013(3): 39-43.QI Yuanxin. Comparisons of filling material classification and service conditions between French and Chinese standard[J]. Railway Construction Technology, 2013(3): 39-43. [9] 李刚, 赵永国, 张留俊. 法国沥青路面设计体系的特点[J]. 中外公路, 2009, 29(3): 316-320.LI Gang, ZHAO Yongguo, ZHANG Liujun. Journal of China & Foreign Highway, 2009, 29(3): 316-320. [10] 单伶燕, 鞠志成, 周兴业, 等. 塞内加尔天然砂土的工程性质及应用研究[J]. 路基工程, 2021(6): 30-34.SHAN Lingyan, JU Zhicheng, ZHOU Xingye, et al. Study on engineering properties and applications of natural sand in Senegal[J]. Subgrade Engineering, 2021(6): 30-34.

Download

Share

COinS